misfire at all rpm

bfreehill2 · 04-11-2012, 05:36 AM

Hello all,
so I have a 98 A4 2.8 30V 5spd 145k that currently has me stumped.
Out of nowhere it began misfiring in traffic, limped it home and it seemed to get worse.
I pulled a few OBD misfire codes but nothing else.

With VAG-Com I observed misfires at idle on plug one,
above 3000 rpm the misfire jumps around to other plugs.

I replaced the plugs, coilpack, cleaned the throttle body and MAS, new fuel filter, and did a compression check.

Plugs wires are next on my list (they look fine but have not tested them yet)

thanks for any input...

Prospeeder · 04-11-2012, 05:53 PM

You didnt do plug wires? Thats your problem. You cant just look at them. thats part of a tune up, replace them. None of the plug wire boots had oil on them when you pulled them out like the valve covers leaking?

A Serious vacuum or air leak, timing being off, belt or chains off, and a bad engine controller are possible random missfire causes.

04-11-2012, 05:53 PM	#2
Prospeeder AudiWorld Senior Member Garage is empty, add now Join Date: Aug 2011 Posts: 837	You didnt do plug wires? Thats your problem. You cant just look at them. thats part of a tune up, replace them. None of the plug wire boots had oil on them when you pulled them out like the valve covers leaking? A Serious vacuum or air leak, timing being off, belt or chains off, and a bad engine controller are possible random missfire causes. __________________ 1992 Audi 100 CS Quattro 1990 Audi 200 Avant Turbo Quattro 1991 Audi 200 Turbo 1999 Audi A6 Avant

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