Car running "rough".....
02-08-2007, 04:29 AM
#1
AudiWorld Member
Thread Starter
Join Date: Apr 2005
Location: Tucson, AZ
Posts: 442
Likes: 0
Received 0 Likes
on
0 Posts
Car running "rough".....
On the way to work yesterday I noticed a spot in the RPM range where the car seem to run rough and have a slight hesitation. On the way home from work the roughness / hesitation became very bad. When cruising at 65-70 in 5th gear at around 3K rpms, when I gave part throttle I could feel a vibration in the car. If I gave it more throttle the vibration got more violent. If I let off the gas, there was no vibration at all. If I downshifted I could accelerate just fine. It only seems to happen at lower RPMs.
Does this sound like an ignition or boost issue or do I need to look somewhere else?? I did not get any check engine lights while this was happening. I will try and check for codes with my VAG-Com this afternoon.
Does this sound like an ignition or boost issue or do I need to look somewhere else?? I did not get any check engine lights while this was happening. I will try and check for codes with my VAG-Com this afternoon.
02-08-2007, 04:36 AM
#2
AudiWorld Senior Member
Sounds a lot like a POS failure and you are only running on 4 cyl
If the POS fails you will have almost no torque at low RPMs and the engine will run rough. You will also notice a bad sulfer smell when you stop because you are dumping 1/5 of your fuel unburned into the catalytic converter where it is burning. STFA for POS.
02-08-2007, 04:48 AM
#4
AudiWorld Super User
Join Date: Aug 2001
Posts: 5,202
Likes: 0
Received 0 Likes
on
0 Posts
When I had the vibration like that at 65-70 mph a couple years ago, it was the subframe not tight to
the body. Cause the moment I let off the throttle it stopped. Just my 2 cents.
02-08-2007, 02:34 PM
#6
AudiWorld Member
Thread Starter
Join Date: Apr 2005
Location: Tucson, AZ
Posts: 442
Likes: 0
Received 0 Likes
on
0 Posts
I noticed the car smelled funny when I got home today.
I guess I will go ahead and try to unplug the injector for one cyl at a time to see if I can figure out which one is not firing.
02-08-2007, 02:39 PM
#7
AudiWorld Member
Thread Starter
Join Date: Apr 2005
Location: Tucson, AZ
Posts: 442
Likes: 0
Received 0 Likes
on
0 Posts
Not really sure......
It was either the computer or a CPS. When I replaced the CPS I guess my solder joint was near where the wires wrapped around the head. The wires are so small and brittle from the original Audi wiring that I had an intermittent problem with my replacement CPS. Last week I used the wiring and connector from an old VW knock sensor and attached it to my replacement CPS closer to the cam gear so my solder joints could stay straight. Haven't had a check engine light since.
Trending Topics
02-08-2007, 02:42 PM
#8
AudiWorld Member
Thread Starter
Join Date: Apr 2005
Location: Tucson, AZ
Posts: 442
Likes: 0
Received 0 Likes
on
0 Posts
It actually does it at different speeds too.
I just notice it a lot more at that speed since that is the speed limit on the road I drive to work and back.
Thread
Thread Starter
Forum
Replies
Last Post
golfindaily
S4 / RS4 (B5 Platform) Discussion
4
12-11-2007 05:38 PM
Is it normal when in 1st gear, going up a slight hill, and no gas...basically idle, for the engine t
aubiexx
S4 (B6 & B7 Platforms) Discussion
8
06-17-2007 05:35 PM
DG@Alta
RS4 (B7 Platform) Discussion
13
05-02-2007 11:19 AM
