Misfire

cbond · 02-01-2006, 04:16 PM

Hello Everyone:

I'm new to your site with my recently purchased 2001 A4 Avant Quattro 2.8. I have quickly ID'd an annoying misfire. It only happens below 2000 rpm with a wider throttle - under load, so to say. Result is mostly perceived as driveline lash. Now, I do have a clue and, to make a long story short, an OBD II diagnostic revealed a code for 'air pump'. Problem is that I don't know how much stock to put in this because at the same time, I had just put in a new battery - and gotten the multi - malfunction light - and am unsure whether the increased voltage shocked a 'gremlin'.

Anyone seen anything like this?

Thanks much.

cbond · 02-21-2006, 03:54 PM

Update: I found another forum site and was advised that I am likely experiencing a pinhole in a line between the air pump and someplace else - most likely the intake manifold. I will have this checked next time it is in the shop.

winnipegguy · 03-27-2006, 01:40 PM

i too have a 2.8 in my 99 a4 i have a misfire problem on cyl. # 1 2 3

cbond · 04-03-2006, 12:36 PM

Well, turns-out to have been the air pump. At $1,550, I've figured-out a new way to spell AUDI: OWWW!DI

**RickT** · 04-03-2006, 06:53 PM

Misfires... coil packs are always a good place to start...

Cheers

winnipegguy · 04-04-2006, 03:06 AM

tries swaping coil pack with known good one and also have new plugs and wires
also have low compression on cyl 1,2and3

04-03-2006, 06:53 PM	#5 (permalink)
RickT Super Moderator Join Date: Feb 2005 Location: West Yorkshire, UK Posts: 1,640 Gallery: (0)	Misfires... coil packs are always a good place to start... Cheers __________________

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02-01-2006, 04:16 PM	#1 (permalink)
cbond Newbie Join Date: Jan 2006 Posts: 7 Gallery: (0)	Hello Everyone: I'm new to your site with my recently purchased 2001 A4 Avant Quattro 2.8. I have quickly ID'd an annoying misfire. It only happens below 2000 rpm with a wider throttle - under load, so to say. Result is mostly perceived as driveline lash. Now, I do have a clue and, to make a long story short, an OBD II diagnostic revealed a code for 'air pump'. Problem is that I don't know how much stock to put in this because at the same time, I had just put in a new battery - and gotten the multi - malfunction light - and am unsure whether the increased voltage shocked a 'gremlin'. Anyone seen anything like this? Thanks much.

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02-21-2006, 03:54 PM	#2 (permalink)
cbond Newbie Join Date: Jan 2006 Posts: 7 Gallery: (0)	Update: I found another forum site and was advised that I am likely experiencing a pinhole in a line between the air pump and someplace else - most likely the intake manifold. I will have this checked next time it is in the shop.

03-27-2006, 01:40 PM	#3 (permalink)
winnipegguy Newbie Join Date: Mar 2006 Posts: 5 Gallery: (0)	i too have a 2.8 in my 99 a4 i have a misfire problem on cyl. # 1 2 3

04-03-2006, 12:36 PM	#4 (permalink)
cbond Newbie Join Date: Jan 2006 Posts: 7 Gallery: (0)	Well, turns-out to have been the air pump. At $1,550, I've figured-out a new way to spell AUDI: OWWW!DI

04-04-2006, 03:06 AM	#6 (permalink)
winnipegguy Newbie Join Date: Mar 2006 Posts: 5 Gallery: (0)	tries swaping coil pack with known good one and also have new plugs and wires also have low compression on cyl 1,2and3

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