Re: Misfire from fuel injector?
The IR temp gun works best on long tube headers. Cast manifolds tend to heat up evenly. Unless its cyl 1 or 5
Cheers Colin J 604-807-4523?
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-------- Original message -------- From: "Peter S s/v Dawa II via groups.io" <scottpeterd@...> Date: 2024-06-14 6:11?a.m. (GMT-08:00) Subject: Re: [PacNW928] Misfire from fuel injector?
Being inherently lazy, I was wondering if I could just take an IR temp gun and shoot each exhaust port to look for one that was cooler. I replaced all of them about 5,000 miles ago. But the car has been sitting for 8 months.
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Re: Misfire from fuel injector?
Being inherently lazy, I was wondering if I could just take an IR temp gun and shoot each exhaust port to look for one that was cooler.
I replaced all of them about 5,000 miles ago.
But the car has been sitting for 8 months.
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Re: Misfire from fuel injector?
If it is the CIS, you can just pull the injectors, put them in bottles and press on the throttle plate and see the spray patterns of each injector to see if they are all spraying correctly.?
There are screens in the dizzy and in each injector.?
If 1 injector isn't spraying just get a new set from Roger. They are not expensive and it's better to have them all new if 1 isn't spraying at idle.?
Cheers Colin J 604-807-4523?
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-------- Original message -------- From: "amidlman via groups.io" <midlman@...> Date: 2024-06-13 10:14?a.m. (GMT-08:00) Subject: Re: [PacNW928] Misfire from fuel injector?
I think his is a 79 so CIS.? Can't remember if the individual injectors have screens, but there is one at the inlet to the fuel distributor that can be cleaned.? I've had success identifying marginal injector by tapping at the base of the injector to see if the stumble clears up.? You can also just pull and replace them (I think Roger 928srus sells them) as an option, but that gets expensive. Did the driving not clear it up?
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Re: Misfire from fuel injector?
I think his is a 79 so CIS.? Can't remember if the individual injectors have screens, but there is one at the inlet to the fuel distributor that can be cleaned.?
I've had success identifying marginal injector by tapping at the base of the injector to see if the stumble clears up.?
You can also just pull and replace them (I think Roger 928srus sells them) as an option, but that gets expensive.
Did the driving not clear it up?
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Re: Misfire from fuel injector?
If 1980-95 take out the injectors and rake them to witch hunter to be tested.
Normally it will be an ignition issue rather than a single injector. But it never hurts to have them tested and eliminated as the issue.
Cheers Colin J 604-807-4523?
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-------- Original message -------- From: "Peter S s/v Dawa II via groups.io" <scottpeterd@...> Date: 2024-06-13 9:18?a.m. (GMT-08:00) Subject: [PacNW928] Misfire from fuel injector?
I am tracing down a misfire. ?Occurs only at idle. ?Opening the throttle and it goes away. Last season I was chasing the same issue. ?New plugs. ?Tested and cleaned plug wires. As I understand it, the injectors have a screen in them that can get clogged. ?So, at idle, the standard fuel pressure is not enough to cause it to fire But when the throttle is opened, there is enough pressure to overcome the blockage in the filter and allow it to fire. Anyone had this happen to them?
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Misfire from fuel injector?
I am tracing down a misfire. ?Occurs only at idle. ?Opening the throttle and it goes away.
Last season I was chasing the same issue. ?New plugs. ?Tested and cleaned plug wires.
As I understand it, the injectors have a screen in them that can get clogged. ?So, at idle, the standard fuel pressure is not enough to cause it to fire
But when the throttle is opened, there is enough pressure to overcome the blockage in the filter and allow it to fire.
Anyone had this happen to them?
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I had the fuel distributor rebuilt a few thousand?miles ago. ?I replaced the large gasket on the plenum
But not the O-ring under the throttle body. Imcan see that being a source of a vacuum leak. ?
Does this go bad?
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Update, I found the barometric pressure sensor (#2) and put it back in-line between the throttle body and the decel valve (#3). ?Part throttle smoothed out, and this high idle came down about 200 rpm. 
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Joe,
Pure mechanical. ?Not even a connector for the fuel consumption gauge
I pulled the AAR. ?The connections were corroded, so I cleaned and de-oxed. ?It is getting 12v to the connector. ?The valve itself tested to work properly with cooling and heating.
The surge is mostly gone now.
Checked the vacuum work I did a few years back. ?Deleted the EGR and the amplifier. ?I also deleted the air pump, and removed the blowoff valve. I found the diaphragm for the dizzy vacuum advance was leaking, so I replaced ?that.
I did leave the decel valve in place. ?However, I remove the barometric valve. ?
One stupid error from my previous work. ?I left the connection from the back of the throttle body to the thermal valve (EGR) switch connected, but didnt blank off the other port on the switch. ?Capped that this morning.
I also found the vacuum line from the dizzy I had hooked up to the front port on the throttle body. ?That connection is for the dizzy retard. ?So I ran the line for the advance to the back of TB where it should be, and capped the front port.
I have checked the vacuum hose connections for both sides of the AAR, and they are tight. ?Both vacuum and atmospheric lines for the check out for tightness.
I have also adjusted the throttle plate screw to time the injectors via the opening pop of the injectors.
Now, I have a warm idle of around 1100 that I cannot bring down with the idle adjustment screw on the front of the throttle body.
Normally, this would indicate a vacuum leak. ?But having gone over the entire vacuum system, I cannot see where it would be coming from.
Any suggestions?
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Re: Xpipe mod - flared ends
I typically shorten the pipes and weld reducers on when installing an X pipe to ensure a better connection?
Cheers Colin J 604-807-4523?
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-------- Original message -------- From: "Stefan Damstrom via groups.io" <sdamstrom@...> Date: 2024-06-12 6:16?a.m. (GMT-08:00) Subject: [PacNW928] Xpipe mod - flared ends
Howdy all, considering a wild hair (hare?) improvement the connection from the Xpipes to the cat back section by either heating with OA and flaring the pipes and eliminate the band clamps that are unsightly and seal half ass. ?Alternatively I could weld on two donor ends as well and flare out the Xpipe ends. ?I MiG welded the rear connection already to my high flow cats and eliminated the rear pair of clamps. ?
I think the doughnut seals (928.111.246.05) and associated Dansk style clamp (928.111.427.00) would make for a quicker and more solid connection and look more Porsche. ?Dumb idea? Brilliant??
I have an annoying exhaust leak which is minor to fix but can hear it.
Cheers,
Stefan
--?
Stefan Damstrom 1988 928 S4 Venetian Blue / Champagne 5 spd 2004 Carrera 4S Cabriolet Arctic Silver/Black Bellevue
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Howdy all, considering a wild hair (hare?) improvement the connection from the Xpipes to the cat back section by either heating with OA and flaring the pipes and eliminate the band clamps that are unsightly and seal half ass. ?Alternatively I could weld on two donor ends as well and flare out the Xpipe ends. ?I MiG welded the rear connection already to my high flow cats and eliminated the rear pair of clamps. ?
I think the doughnut seals (928.111.246.05) and associated Dansk style clamp (928.111.427.00) would make for a quicker and more solid connection and look more Porsche. ?Dumb idea? Brilliant??
I have an annoying exhaust leak which is minor to fix but can hear it.
Cheers,
Stefan
--?
Stefan Damstrom 1988 928 S4 Venetian Blue / Champagne 5 spd 2004 Carrera 4S Cabriolet Arctic Silver/Black Bellevue
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Re: Good day at ERTC - German Car Day
Great showing and you got the prime time spot for sure! Great visiting with you, Tom and hope to see everyone at the end of the month.?
Jason
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On Jun 8, 2024, at 8:21?PM, amidlman via groups.io <midlman@...> wrote:
? Jason and I represented at ERTC German Car day.? Beautiful weather and lots of great Porsches amongst other.?
I got there early enough to make the Center Circle area.?? First for my? "10 footer" 928 that just rolled over 340,000km (approx 211,000 miles).? When he put a yellow tag under my windshield wiper I was sure I was being relegated to the back room, so imagine my surprise when he said, follow the Mansory RSQ8 Audi to the Center Circle. !!
Even say Anthony (Sir Mix Alot) being pretty much incognito and ignore by most of the folks around him LOL.?
Cheers,
Tom <20240608_084655.jpg> <20240608_073308.jpg>
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That’s awesome, thanks. I moved it today and I crumbled in my fingers.? Rob F. 253.209.8638 WPFC G12 Black WPFC G14 Navy
GO PREMIER!
One Club, One Mission!
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On Jun 10, 2024, at 8:17 PM, cjensan928s <cjensan@...> wrote:
? https://928srus.com/products/throttle-position-harness-tps-85-86-s3-32v-928-607-115-00?_pos=1&_psq=TPS&_ss=e&_v=1.0
Cheers Colin J 604-807-4523?
-------- Original message -------- From: "Huntnphool via groups.io" <Huntnphool@...> Date: 2024-06-10 6:49?p.m. (GMT-08:00) Subject: Re: [PacNW928] 85S running again
?Been chatting with Tom about possible causes and I’m about ready to pull the fuel rails and injectors. I’ve confirmed that all the plugs are sparking, but I’m not convinced that I’m getting fuel to each cylinder.?
?I do have another question though. There is a 3 pin connector sitting directly behind the round diagnostic piece, and it has its own little bracket that holds it there. Can anyone tell me what that 3 pin connector is? Rob F. 253.209.8638 WPFC G12 Black WPFC G14 Navy
GO PREMIER!
One Club, One Mission! On Jun 7, 2024, at 4:08 PM, Scurry via groups.io <drkekar@...> wrote:
?I believe it was my fault. I had just had the lower end rebuilt and reinstalled it and that was when I noticed that it would vibrate when getting on the throttle. I had did what you did and replaced most of the ignition bits. Still vibrated. Rechecked the timing and that was when I found it. So a bit different than your sequence of events.
David
1986.5
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https://928srus.com/products/throttle-position-harness-tps-85-86-s3-32v-928-607-115-00?_pos=1&_psq=TPS&_ss=e&_v=1.0
Cheers Colin J 604-807-4523?
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-------- Original message -------- From: "Huntnphool via groups.io" <Huntnphool@...> Date: 2024-06-10 6:49?p.m. (GMT-08:00) Subject: Re: [PacNW928] 85S running again
?Been chatting with Tom about possible causes and I’m about ready to pull the fuel rails and injectors. I’ve confirmed that all the plugs are sparking, but I’m not convinced that I’m getting fuel to each cylinder.?
?I do have another question though. There is a 3 pin connector sitting directly behind the round diagnostic piece, and it has its own little bracket that holds it there. Can anyone tell me what that 3 pin connector is? Rob F. 253.209.8638 WPFC G12 Black WPFC G14 Navy
GO PREMIER!
One Club, One Mission! On Jun 7, 2024, at 4:08 PM, Scurry via groups.io <drkekar@...> wrote:
?I believe it was my fault. I had just had the lower end rebuilt and reinstalled it and that was when I noticed that it would vibrate when getting on the throttle. I had did what you did and replaced most of the ignition bits. Still vibrated. Rechecked the timing and that was when I found it. So a bit different than your sequence of events.
David
1986.5
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Throttle position switch.?
If it is broken Roger carries a replacement on his website that is a very nice piece.?
Cheers Colin J 604-807-4523?
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-------- Original message -------- From: "Huntnphool via groups.io" <Huntnphool@...> Date: 2024-06-10 6:49?p.m. (GMT-08:00) Subject: Re: [PacNW928] 85S running again
?Been chatting with Tom about possible causes and I’m about ready to pull the fuel rails and injectors. I’ve confirmed that all the plugs are sparking, but I’m not convinced that I’m getting fuel to each cylinder.?
?I do have another question though. There is a 3 pin connector sitting directly behind the round diagnostic piece, and it has its own little bracket that holds it there. Can anyone tell me what that 3 pin connector is? Rob F. 253.209.8638 WPFC G12 Black WPFC G14 Navy
GO PREMIER!
One Club, One Mission! On Jun 7, 2024, at 4:08 PM, Scurry via groups.io <drkekar@...> wrote:
?I believe it was my fault. I had just had the lower end rebuilt and reinstalled it and that was when I noticed that it would vibrate when getting on the throttle. I had did what you did and replaced most of the ignition bits. Still vibrated. Rechecked the timing and that was when I found it. So a bit different than your sequence of events.
David
1986.5
|
?Been chatting with Tom about possible causes and I’m about ready to pull the fuel rails and injectors. I’ve confirmed that all the plugs are sparking, but I’m not convinced that I’m getting fuel to each cylinder.?
?I do have another question though. There is a 3 pin connector sitting directly behind the round diagnostic piece, and it has its own little bracket that holds it there. Can anyone tell me what that 3 pin connector is? Rob F. 253.209.8638 WPFC G12 Black WPFC G14 Navy
GO PREMIER!
One Club, One Mission!
toggle quoted message
Show quoted text
On Jun 7, 2024, at 4:08 PM, Scurry via groups.io <drkekar@...> wrote:
?I believe it was my fault. I had just had the lower end rebuilt and reinstalled it and that was when I noticed that it would vibrate when getting on the throttle. I had did what you did and replaced most of the ignition bits. Still vibrated. Rechecked the timing and that was when I found it. So a bit different than your sequence of events.
David
1986.5
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Re: Good day at ERTC - German Car Day
I've welded up those holes on a number of cars.... if you ever want to road trip...? Cheers Colin J 604-807-4523
Thanks,
Although the rub strip delete (started back in 06) is still
unfinished LOL.? Black hides the holes well :) .?
I have decided to put the rub strips back on again since the car
came with them in the first place and want to keep it as original
as possible, even though I do prefer it without.
Now to find the missing pieces in the garage after a couple of
moves.
BTW, the XXX event at the end of the month has been moved from
the XXX in Issaquah to Carillon Point in Kirkland.? Not sure why,
but am guessing Burgermaster isn't quite ready to host events just
yet.
On 6/9/2024 12:02 PM, Brian Sullivan
via wrote:
Congratulations Tom!? Looks like you finished your rub strip
delete.? Sharks look best without for sure IMO. Hope to be at the
XXX event at the end of the month?
On
Saturday, June 8, 2024, 9:08 PM, amidlman via
<midlman@...> wrote:
Never saw his Benz's when he's been there.? Mostly a
Lambo or McLaren of some sort.?
On 6/8/2024 8:39
PM, Aaron Kraljev via wrote:
Sir Mix Alot was there? Did he have one of
his Benz's with him?
?
Jason and I represented at ERTC German Car day.?
Beautiful weather and lots of great Porsches amongst
other.?
I got there early enough to make the Center Circle
area.?? First for my? "10 footer" 928 that just rolled
over 340,000km (approx 211,000 miles).? When he put a
yellow tag under my windshield wiper I was sure I was
being relegated to the back room, so imagine my
surprise when he said, follow the Mansory RSQ8 Audi to
the Center Circle. !!
Even say Anthony (Sir Mix Alot) being pretty much
incognito and ignore by most of the folks around him
LOL.?
Cheers,
Tom
<20240608_084655.jpg>
<20240608_073308.jpg>
|
Re: Good day at ERTC - German Car Day
Thanks,
Although the rub strip delete (started back in 06) is still
unfinished LOL.? Black hides the holes well :) .?
I have decided to put the rub strips back on again since the car
came with them in the first place and want to keep it as original
as possible, even though I do prefer it without.
Now to find the missing pieces in the garage after a couple of
moves.
BTW, the XXX event at the end of the month has been moved from
the XXX in Issaquah to Carillon Point in Kirkland.? Not sure why,
but am guessing Burgermaster isn't quite ready to host events just
yet.
On 6/9/2024 12:02 PM, Brian Sullivan
via groups.io wrote:
toggle quoted message
Show quoted text
Congratulations Tom! ?Looks like you finished your rub strip
delete. ?Sharks look best without for sure IMO. Hope to be at the
XXX event at the end of the month?
On
Saturday, June 8, 2024, 9:08 PM, amidlman via groups.io
<midlman@...> wrote:
Never saw his Benz's when he's been there.? Mostly a
Lambo or McLaren of some sort.?
On 6/8/2024 8:39
PM, Aaron Kraljev via groups.io wrote:
Sir Mix Alot was there? Did he have one of
his Benz's with him?
On Jun 8, 2024, at 8:21?PM,
amidlman via groups.io <midlman@...>
wrote:
?
Jason and I represented at ERTC German Car day.?
Beautiful weather and lots of great Porsches amongst
other.?
I got there early enough to make the Center Circle
area.?? First for my? "10 footer" 928 that just rolled
over 340,000km (approx 211,000 miles).? When he put a
yellow tag under my windshield wiper I was sure I was
being relegated to the back room, so imagine my
surprise when he said, follow the Mansory RSQ8 Audi to
the Center Circle. !!
Even say Anthony (Sir Mix Alot) being pretty much
incognito and ignore by most of the folks around him
LOL.?
Cheers,
Tom
<20240608_084655.jpg>
<20240608_073308.jpg>
|
Re: Good day at ERTC - German Car Day
Congratulations Tom! ?Looks like you finished your rub strip delete. ?Sharks look best without for sure IMO. Hope to be at the XXX event at the end of the month?
On Saturday, June 8, 2024, 9:08 PM, amidlman via groups.io <midlman@...> wrote:
Never saw his Benz's when he's been there.? Mostly a Lambo or
McLaren of some sort.?
On 6/8/2024 8:39 PM, Aaron Kraljev via
groups.io wrote:
Sir Mix Alot was there? Did he have one of his
Benz's with him?
On Jun 8, 2024, at 8:21?PM, amidlman via
groups.io <midlman@...> wrote:
?
Jason and I represented at ERTC German Car day.? Beautiful
weather and lots of great Porsches amongst other.?
I got there early enough to make the Center Circle area.??
First for my? "10 footer" 928 that just rolled over
340,000km (approx 211,000 miles).? When he put a yellow tag
under my windshield wiper I was sure I was being relegated
to the back room, so imagine my surprise when he said,
follow the Mansory RSQ8 Audi to the Center Circle. !!
Even say Anthony (Sir Mix Alot) being pretty much incognito
and ignore by most of the folks around him LOL.?
Cheers,
Tom
<20240608_084655.jpg>
<20240608_073308.jpg>
|
Re: Good day at ERTC - German Car Day
Never saw his Benz's when he's been there.? Mostly a Lambo or
McLaren of some sort.?
On 6/8/2024 8:39 PM, Aaron Kraljev via
groups.io wrote:
toggle quoted message
Show quoted text
Sir Mix Alot was there? Did he have one of his
Benz's with him?
On Jun 8, 2024, at 8:21?PM, amidlman via
groups.io <midlman@...> wrote:
?
Jason and I represented at ERTC German Car day.? Beautiful
weather and lots of great Porsches amongst other.?
I got there early enough to make the Center Circle area.??
First for my? "10 footer" 928 that just rolled over
340,000km (approx 211,000 miles).? When he put a yellow tag
under my windshield wiper I was sure I was being relegated
to the back room, so imagine my surprise when he said,
follow the Mansory RSQ8 Audi to the Center Circle. !!
Even say Anthony (Sir Mix Alot) being pretty much incognito
and ignore by most of the folks around him LOL.?
Cheers,
Tom
<20240608_084655.jpg>
<20240608_073308.jpg>
|
Peter S s/v Dawa II
Stefan Damstrom