I have a 1999 Audi A4 2.8L and I have recently installed an aftermarket
intake. Since then (couple weeks ago) the idle is somewhat unstable at
low speeds or while clutching, to the point where it even stalls
occasionly (happened twice). Now the CEL (check engine light) appears
as soon as I start up the car and remains lit. So what should I do?
Should I re-install the stock air box? Maybe everything will go back to
normal? Or should I replace the MAF(or whatever is actually wrong) and
keep the aftermarket intake? Or will the problem just re-occur? Also I
heard that the idle and stalling problems could be due to the Idle
Control Valve being not clean. I know that you can clean it, using
carb/throttle body cleaner. The hard part is getting it out.
Any thoughts would be great.
Also I've have ordered a engine scanner and will know the exact problem
code as soon as it arrives (a couple days).
On 19 Aug 2006 20:03:14 -0700, email@example.com wrote:
When you get the scanner, dump the ECU error codes, then check the adaptation
values for the MAF. The ECU can adapt to the aging that all MAFs experience,
but it has a diagnostic limit that can trip readiness bits and cause the MIL
to light up.
If you determine it's indeed the MAF going to heaven, check with a main line
dealer to see if they'll cover the replacement on a double-secret warranty
program. I had a MAF go bad (adaptation had hit +22%) and Audi replaced it for
no cost to me, even though it was outside of the original warranty.
Also, if you got one of those CAIs that used oiled filters, be prepared to
replace the MAF often...
'00 s4 6spd
Thanks, I will look into it in a couple days as soon as my scanner
comes. If it is the MAF I will defintely take that CAI out and go back
to stock. I really don't feel like stalling around town or dealing with
this again, just a waste of time and $$$. It's sad though, I had a
really nice set up, custom made to only breathe the air from outside.
Also, what you said about some of the CAI having oiled filters. I never
knew that. How do I know if my cone is oiled?
I really didn't think that the Audi sensors would be so
sensitive/complicated. Oh well it was a cheap part to put in this car.
I did everything else like rims, suspension, 12 pc control arm upgrade,
brembo brake rotors, and I just thought like the CAI was the only thing
I hadn't done yet. So I put one in. Bad move.
But could there also be a chance that the CAI had nothing to do with
Now I'm saving for a Pes G2 Supercharger, not quite there yet.
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