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Subject says it all. Have 2.5 installed with Precis ECU the harness conversion done by Busaru. Stock '91 auto tranny and stock 14 inch wheels. At 65 mph and above the engine starts bucking. The only way to stop it is to reduce speed below 65 mph. On a few occasions I have managed?to hit 70 before bucking sets in. At 70 mph the tach reads 4000 rpm. Has anyone got any ideas about the problem and how to fix it? I should be able to turn 6500 rpm easily with this engine but I have no particular need to do faster than 70 in most cases. The VSS is Busaru and is set 4 mm clearance from stub axle flange?bolts.?
All comments and and suggestions would be appreciated,
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First question - What did Busaru say when you asked them? Andy Vanis USA and Whatsapp +1(505) 304-5306
Subject says it all. Have 2.5 installed with Precis ECU the harness conversion done by Busaru. Stock '91 auto tranny and stock 14 inch wheels. At 65 mph and above the engine starts bucking. The only way to stop it is to reduce speed below 65 mph. On a few occasions I have managed?to hit 70 before bucking sets in. At 70 mph the tach reads 4000 rpm. Has anyone got any ideas about the problem and how to fix it? I should be able to turn 6500 rpm easily with this engine but I have no particular need to do faster than 70 in most cases. The VSS is Busaru and is set 4 mm clearance from stub axle flange?bolts.?
All comments and and suggestions would be appreciated,
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Going? to check in with them? today.
First question - What did Busaru say when you asked them? Andy Vanis USA and Whatsapp +1(505) 304-5306
Subject says it all. Have 2.5 installed with Precis ECU the harness conversion done by Busaru. Stock '91 auto tranny and stock 14 inch wheels. At 65 mph and above the engine starts bucking. The only way to stop it is to reduce speed below 65 mph. On a few occasions I have managed?to hit 70 before bucking sets in. At 70 mph the tach reads 4000 rpm. Has anyone got any ideas about the problem and how to fix it? I should be able to turn 6500 rpm easily with this engine but I have no particular need to do faster than 70 in most cases. The VSS is Busaru and is set 4 mm clearance from stub axle flange?bolts.?
All comments and and suggestions would be appreciated,
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This is common when the speed sensor isn¡¯t working.
If you buy obd 2 scanner like an Ultragauge you can monitor vehicle speed. It won¡¯t be accurate but it is important.
If the sensor isn¡¯t working it will read 0mph. Regards,
Casey? 978-846-1765 caseylacourse@...
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On Feb 2, 2023, at 1:23 AM, John Rodgers <jrodgers113@...> wrote:
? Going? to check in with them? today. First question - What did Busaru say when you asked them? Andy Vanis USA and Whatsapp +1(505) 304-5306
Subject says it all. Have 2.5 installed with Precis ECU the harness conversion done by Busaru. Stock '91 auto tranny and stock 14 inch wheels. At 65 mph and above the engine starts bucking. The only way to stop it is to reduce speed below 65 mph. On a few occasions I have managed?to hit 70 before bucking sets in. At 70 mph the tach reads 4000 rpm. Has anyone got any ideas about the problem and how to fix it? I should be able to turn 6500 rpm easily with this engine but I have no particular need to do faster than 70 in most cases. The VSS is Busaru and is set 4 mm clearance from stub axle flange?bolts.?
All comments and and suggestions would be appreciated,
|
Maybe reduce the speed sensor distance, making it closer and see if it stops. Easy, no cost , troubleshooting step.
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On Feb 2, 2023, at 5:52 AM, Casey LaCourse <caseylacourse@...> wrote:
? This is common when the speed sensor isn¡¯t working.
If you buy obd 2 scanner like an Ultragauge you can monitor vehicle speed. It won¡¯t be accurate but it is important.
If the sensor isn¡¯t working it will read 0mph. Regards,
Casey? 978-846-1765 caseylacourse@... On Feb 2, 2023, at 1:23 AM, John Rodgers <jrodgers113@...> wrote:
? Going? to check in with them? today. First question - What did Busaru say when you asked them? Andy Vanis USA and Whatsapp +1(505) 304-5306
Subject says it all. Have 2.5 installed with Precis ECU the harness conversion done by Busaru. Stock '91 auto tranny and stock 14 inch wheels. At 65 mph and above the engine starts bucking. The only way to stop it is to reduce speed below 65 mph. On a few occasions I have managed?to hit 70 before bucking sets in. At 70 mph the tach reads 4000 rpm. Has anyone got any ideas about the problem and how to fix it? I should be able to turn 6500 rpm easily with this engine but I have no particular need to do faster than 70 in most cases. The VSS is Busaru and is set 4 mm clearance from stub axle flange?bolts.?
All comments and and suggestions would be appreciated,
|
To check your speed sensor. Raise rear wheel with the sensor. Turn ignition on engine off. Rotate wheel and watch red light on sensor. The red light should on and off as you rotate the wheel and sensor passes the cv bolts?
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Speed limiting with 6 pulse VSS and 14 inch wheels? Not the? same VSS but there are these technical notes? from FastForward:
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I've had a Smallcar 4P mounted in the O2 counter that worked and then a? Smallcar CV mounted 5P VSS that? worked flawlessly.?
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This is definitely the vss sending the wrong info to the computer so it thinks it has hit maximum speed. Which hiccups the engine slowing it down.
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That is an exact description of what seems to be happening.? Gives me an idea of what to do next.
Thanks
On Thu, Feb 2, 2023 at 9:45 AM adam warner < madaterb@...> wrote: This is definitely the vss sending the wrong info to the computer so it thinks it has hit maximum speed. Which hiccups the engine slowing it down.?
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To check your speed sensor. Raise rear wheel with the sensor. Turn ignition on engine off. Rotate wheel and watch red light on sensor. The red light should on and off as you rotate the wheel and sensor passes the cv bolts?
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I argue this is basic for working condition, but I thought your issue was at 65 mph +.? Dont you already know it works at speeds below 65 mph ? I thought that was implicit or verified.
Just trying to keep the troubleshooting focused on your issue, above 65 mph. Not discount advice :-)
? --? Sean G
On Thursday, February 2, 2023 at 10:21:17 AM MST, John Rodgers <jrodgers113@...> wrote:
To check your speed sensor. Raise rear wheel with the sensor. Turn ignition on engine off. Rotate wheel and watch red light on sensor. The red light should on and off as you rotate the wheel and sensor passes the cv bolts?
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Yes 4mm? seems big. I set my SC VSS distance at 0.045 with a feeler gauge just like the plugs.
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John, If your speed sensor is set too far away you will get this problem. Same thing with Hall effect sensors. Put your sensor closer and you'll get better pick up. Good luck Terry
Subject says it all. Have 2.5 installed with Precis ECU the harness conversion done by Busaru. Stock '91 auto tranny and stock 14 inch wheels. At 65 mph and above the engine starts bucking. The only way to stop it is to reduce speed below 65 mph. On a few occasions I have managed?to hit 70 before bucking sets in. At 70 mph the tach reads 4000 rpm. Has anyone got any ideas about the problem and how to fix it? I should be able to turn 6500 rpm easily with this engine but I have no particular need to do faster than 70 in most cases. The VSS is Busaru and is set 4 mm clearance from stub axle flange?bolts.?
All comments and and suggestions would be appreciated,
|
Morning John.
Sorry you¡¯re having trouble with your conversion.
Because you have a non stock ecu we will have difficulty supporting you.
My suggestion is to use the conversion mechanic, and/or the ecu vendor (in that order) to get support for the issue.
Non stock component support conversations have limited value to our group as a whole and I will discourage them.
Best,
Brent
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Brent, Mine is a stock ecu. I said it came from a Precis. I misspoke. It came from an Impreza.?
John
Morning John.
Sorry you¡¯re having trouble with your conversion.
Because you have a non stock ecu we will have difficulty supporting you.
My suggestion is to use the conversion mechanic, and/or the ecu vendor (in that order) to get support for the issue.
Non stock component support conversations have limited value to our group as a whole and I will discourage them.
Best,
Brent
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Thanks for that tip. Will move it closer and see?what happens.
John, If your speed sensor is set too far away you will get this problem. Same thing with Hall effect sensors. Put your sensor closer and you'll get better pick up. Good luck Terry
Subject says it all. Have 2.5 installed with Precis ECU the harness conversion done by Busaru. Stock '91 auto tranny and stock 14 inch wheels. At 65 mph and above the engine starts bucking. The only way to stop it is to reduce speed below 65 mph. On a few occasions I have managed?to hit 70 before bucking sets in. At 70 mph the tach reads 4000 rpm. Has anyone got any ideas about the problem and how to fix it? I should be able to turn 6500 rpm easily with this engine but I have no particular need to do faster than 70 in most cases. The VSS is Busaru and is set 4 mm clearance from stub axle flange?bolts.?
All comments and and suggestions would be appreciated,
|
I am not sure if this is relevant or not....but I have an old Audiovox CCS-100 Cruise Control on my Vanagon with EJ22.? It works Fantastic!? It uses magnets on axles to determine speed.? Well...I replaced those magnets with modern ones....you know, the rare earth metal kind.? Before, if I would hit a bump in the road, the Cruise Control would lose it's mind and shut down.? Now, with powerful rare earth magnets, everything goes just fine, bumps in road or not.? It made a huge difference.
On Saturday, February 4, 2023 at 08:06:08 AM PST, John Rodgers <jrodgers113@...> wrote:
Thanks for that tip. Will move it closer and see?what happens.
John, If your speed sensor is set too far away you will get this problem. Same thing with Hall effect sensors. Put your sensor closer and you'll get better pick up. Good luck Terry
Subject says it all. Have 2.5 installed with Precis ECU the harness conversion done by Busaru. Stock '91 auto tranny and stock 14 inch wheels. At 65 mph and above the engine starts bucking. The only way to stop it is to reduce speed below 65 mph. On a few occasions I have managed?to hit 70 before bucking sets in. At 70 mph the tach reads 4000 rpm. Has anyone got any ideas about the problem and how to fix it? I should be able to turn 6500 rpm easily with this engine but I have no particular need to do faster than 70 in most cases. The VSS is Busaru and is set 4 mm clearance from stub axle flange?bolts.?
All comments and and suggestions would be appreciated,
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"Hall effect sensors typically like an air-gap (the distance between the sensor and the target material) of around 1mm or 40 thou' In."
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Brent Weide
OlRivrRat DeanB