Car misfires badly, What's my next step?

**generik777** · 12-03-2008 04:48 PM

The car is a 30V 2.8. Well a couple months back my car started missing real bad. Under heavy gas the car would almost die and the CEL would flash. If I kept it under about 20 it would run but very roughly. I replaced the spark plugs, the spark plug wires, and the Ignition Coil Pack. None of those fixed my problem so I got frustrated and brought it to the mechanic.

He suggested the intake manifold gasket, Well he replaced that and the problem still is the same. I'm getting frustrated.

BTW I forgot to mention the problem has mainly been cylinder 4 misfiring.

UPDATE: The mechanic also tried swapping injectors, swapping spark plugs and plug wires, pressure tested the cylinders and all that. Nothing fixed the problem or moved the problem from cylinder 4 and the pressure tests came back perfect. He ordered a scanner from Audi that should be here in a few days so he can do more detective work.

**audiness** · 12-03-2008 05:30 PM

ICM .

**MultiAudis** · 12-03-2008 07:11 PM

Originally Posted by generik777

I replaced the spark plugs,the spark plug wires, and the Ignition Coil Pack.

Do you mean the ICM (Ignition Control Module) or the coil pack(s), which there are 4 of and are an extremely common cause of misfires on the 1.8t?

Check engine light?
Have you scanned for codes?
Which cylinders are misfiring?

**MultiAudis** · 12-03-2008 07:14 PM

I fail... Didn't look to see you're a 2.8... Please disregard prior post

**generik777** · 12-03-2008 07:14 PM

Originally Posted by MultiAudis

Do you mean the ICM (Ignition Control Module) or the coil pack(s), which there are 4 of and are an extremely common cause of misfires on the 1.8t?

Check engine light?
Have you scanned for codes?
Which cylinders are misfiring?

I'm talking about this. I have a 2.8

**TverRus69** · 12-03-2008 10:21 PM

still have the old coil pack? since it wasn't the problem, you wanna sell it? Or i can trade you for a throttle body or MAF (haha im broke and desperate).

**generik777** · 12-04-2008 01:04 PM

OP Updated.

**generik777** · 12-08-2008 04:03 PM

Bump

**generik777** · 12-24-2008 01:06 PM

TTT

**ghost6303** · 12-24-2008 01:09 PM

the first, and next, step should be to scan the codes.

**generik777** · 12-24-2008 01:16 PM

Originally Posted by ghost6303

the first, and next, step should be to scan the codes.

Yeah, that's been done. Misfire cylinder 4 is what comes up.

**ghost6303** · 12-24-2008 01:24 PM

thats not a code. i want the number that came up, either P-xxxx or the vag code so i know exactly what it was. was that the only one single code in there? no other "too lean/too rich", 02 or MAF sensor codes? nothing?

**generik777** · 12-24-2008 01:28 PM

Originally Posted by ghost6303

thats not a code. i want the number that came up, either P-xxxx or the vag code so i know exactly what it was. was that the only one single code in there? no other "too lean/too rich", 02 or MAF sensor codes? nothing?

These were the codes that came up when I first scanned back when the problem started. The mechanic said that just the one for cylinder 4 is coming up now, The others might have been old or just fixed by the stuff that was done so far.

16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-00 - -
16688 - Shareware Version. To Decode all DTCs
P0304 - 35-00 - Please Register/Activate
16684 - Shareware Version. To Decode all DTCs
P0300 - 35-10 - Please Register/Activate - Intermittent
16688 - Cylinder 4 Misfire Detected
P0304 - 35-10 - - - Intermittent