OMG, a new missfire at idle thread! lol

[Unispeed]

Please Delete

[RolledMySTi]

I would expect a small vacuum leak. Have you pressure tested?

[AudiSportB5S4]

dont get my started on misfiring at idle LOL. I have had it for a while now........for the most part its better ( i had to replace all coilpacks, plugs, ICMs, coolant temp sensor) all of it really. I still have it, and we think (myself and VAST) that its in the chip, so were trying something new. I have NO vacuum leaks either. its just soosoosso annoying!

[Tifosi]

A little history on the car will help. What tune do you have on the car ?

[AudiSportB5S4]

you're going to never wish you asked! Heres a link to my thread (SORRY OP, THIS CAN PROBABLY HELP US BOTH OUT) to my issues....

http://www.audizine.com/forum/showthread.php?t=184167

all those WHILE driving issues were taken care of with 6 coilpacks, coolant temp sensor, plugs and ICMs.

then i had misfiring at idle. mike @ vast was stumped. we figured last thing it could be was the 5 bar FPR i was running at the time of 3- for 6 months.... i just did full fueling (RS4 Airbox, RS4 accordion, Bosch Green Giant Injectors etc) and went back to the ol' 4 BAR. idle was smoother but still getting misfiring at idle. enough to throw CEL. With VAG I ll get about 20 a min with blocks 014,015,016. Mike thinks that MAYBE it could be a ECU issue in the coding somewhere..... my car kinda doesnt start up as strong as it used to, can a dying fuel pump cause misfires @ idle? weird thing is just as OP states, once im moving, no more misfires. back to back runs, no misfiring, only at idle they rack up

[AB18]

Ive been misfiring at idle for 40k now, do you think i can solve it? Of course not. Ive changed timing belt,spark plugs, new coolant temp sensor,swapped coils, swapped ignition control modules, raised my idle and more. Ive totally given up.

[Quattrocket]

try seafoaming. I had this prob for months, then my mech filled the cylinders with WD-40 for the weekend and drained it out on monday. changed the plugs and the car ran amazing. carbon build up can really casue alot of problems.

[AB18]

Oh, add that to my list to. I seafoamed the oil, gas, and sucked it into the intake.

[Matt@JHM]

Which tune is this? So it's misfiring and not showing a code? Hmmm....

[AudiSportB5S4]

Which tune is this? So it's misfiring and not showing a code? Hmmm....

its VAST. yeah, i mean it shows a code, but mostly silent ones that i have to check like no CELs.

[The_Jerbel]

What's your load at idle reading?

[damnthemansam]

i have a weird idle to, barely ever misfires but it does once in a great while.. but every so often when i pull up to a stop light, and the rpms drop to idle it chokes and drops from ~700rpm to maybe ~550-600 only for a few seconds and then picks back up.. i was gonna do some coil packs, any ideas?

[AudiSportB5S4]

What's your load at idle reading?

16 percent.. did you get my PM i just sent, let me know i have a feeling like you're not getting them LOL . if not i ll just call you tomorrow see what you think

[The_Jerbel]

i have a weird idle to, barely ever misfires but it does once in a great while.. but every so often when i pull up to a stop light, and the rpms drop to idle it chokes and drops from ~700rpm to maybe ~550-600 only for a few seconds and then picks back up.. i was gonna do some coil packs, any ideas?

Any vacuum or boost leaks?

[The_Jerbel]

16 percent.. did you get my PM i just sent, let me know i have a feeling like you're not getting them LOL . if not i ll just call you tomorrow see what you think

PM replied

[damnthemansam]

Any vacuum or boost leaks?

well ive had a sneaking suspicion that the vacuum line to the brake booster is leaking. i called audi and apparently there is a service bulletin with an updated repair with a new check valve, lines, hose clamps and connections. he told me $70 so its worth a shot.

[BITRBO]

well ive had a sneaking suspicion that the vacuum line to the brake booster is leaking. i called audi and apparently there is a service bulletin with an updated repair with a new check valve, lines, hose clamps and connections. he told me $70 so its worth a shot.

Has anyone tried this yet, or have further insight to the issue?

[Unispeed]

BUMP... any info on the service bullitin talked about in the 2 previous posts?