Thanks,
I will check those components as well as the O2 sensor based on your and
other emails. Thanks everyone for the suggestions.
I'll report my results back.
John
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----- Original Message -----
From: "Leon Korkin" <korkwood@...>
To: <subaruvanagon@...>
Sent: Sunday, January 07, 2001 9:39 PM
Subject: Re: [subaruvanagon] Re: persistent backfire popping at deceleration
The "normal" error codes should be 33,51 and 52. Error codes 21 and 24
indicate
that those parts may be defective.The IAC aka air by-pass is important for
cold starts and ECT(code 21) is affecting the timing function of ECU by
sending confusing signals, so both may be adding to your problem.
Resetting codes will not solve the problems.Check both as shown in repair
manual and replace if defective.
My IAC is not working perfectly mechanicaly but electricaly is ok so i
don't get error codes.
KEP cat and muffler are fine and work better than stock VW.But more
restrictive exhaust shouldn't cause backfiring only less power at high
rpm.
Leon
85 Subwagen Westy
ps you mentioned visiting KEP, are you close to Palmdale?
John wrote:
I get an error 33, the speed sensor as it's missing. error 21 for
the coolant due to the filling & bleeding I presume. Error 24 the
Idle Air Control. I don't know why I would get that one but I tried
to clear the codes by connecting both the greens and the blacks
together and could not get them to reset. Is that the three you are
referring to?
I did most of the conversion myself. I had a shop replace the timing
belt and do the high pressure steering hose. The exhaust seems to be
in good shape. When I went to Kennedy to ask if I should try his
combination he said stick with the VW. He also said that the higher
exhaust back-pressure would not cause the reported symptoms. As a
result I didn't want to buy a new cat/muffler as a troubleshooting
exercise.
Someone else mentioned more flow as a possible solution. Does anyone
know what's wrong with the Kennedy cat/muffler combo? Can a more
restrictive exhaust cause the backfiring and popping. It also
happens a bit in between shifting but it is barely noticeable.
Thanks for the response
John
--- In subaruvanagon@..., Leon Korkin <korkwood@s...> wrote:
John,
It is indeed very unusual to hear about this problem with Suby. Are
you
getting any error codes?There should be 3 codes after conversion not
affecting any function.
Did you do conversion youself?Is you exhaust system in good shape?
The
standard
VW muffler is resrictive and robs the power from Suby.There are
several
performance mufflers that will fit there and help to get Suby breath
easyer.
Good luck
85 Subwagen Westy
John wrote:
My 93 Legacy installation has an annoying problem. It has always
had
a popping backfire when decelerating. especially when coming to a
stop or hard deceleration using the engine.
I have under 20,000 miles on the conversion. I have doen the
following to try to eliminate:
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