Rough Idle when going into Gear

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Jan 2, 2007 | 10:12 PM

MannyFresh

Thread Starter

Racer

Joined: May 2006

Posts: 384

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From: Anaheim CA

Rough Idle when going into Gear

I did a search for this already but didn't really find anything. The car vibrates and the rpm's go down when putting the car into Drive or Reverse but once it's in gear it idle's just fine. What could be the problem?

Thanks in advance,

Manny

Jan 2, 2007 | 10:24 PM

PDQC5

Instructor

Joined: Apr 2004

Posts: 133

Likes: 7

From: Wenatchee WA

My 98 A4 does the same thing. I thought I read on the forum one time that high mileage spark plugs can cause erratic/low idle conditions. Maybe someone else can confirm if the plugs can cause this.

Jan 3, 2007 | 01:18 PM

MannyFresh

Thread Starter

Racer

Joined: May 2006

Posts: 384

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From: Anaheim CA

Well I changed the spark plugs and wires about a month ago so it can't be that. I'm thinking maybe something with the battery? Alternator? Anyone?

Jan 3, 2007 | 01:37 PM

VetteDrmr

Le Mans Master

Joined: Dec 2000

Posts: 9,915

Likes: 1,870

From: Hot Springs AR

When was the last time you had the tranny fluid flushed? Old or tired tranny fluid can cause all sorts of headaches.

Want to help, but need more info.

Have a good one,
Mike

Jan 3, 2007 | 05:21 PM

Bfail

Instructor

Joined: Jan 2007

Posts: 157

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From: Austin TX

I have the same problem with my 99' vette.

Jan 3, 2007 | 06:08 PM

~~Todd157k~~

Banned Scam/Spammer

Joined: Jul 2006

Posts: 2,911

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From: Simi Valley CA

There's been several threads on rough idle. Most of them seem to cure (as did mine) with a good flushing using Sea Foam. Also, check for intake leaks.. usually AFTER the MAF.

Jan 3, 2007 | 08:12 PM

tomas721

Instructor

Joined: Oct 2006

Posts: 111

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From: Carrollton TX

Quote:

Originally Posted by MannyFresh

If you have an A4 and this is happening on start-up then wait until the DIC displays "Brake Before Shift" and see if that helps. My guess is that it takes the computer a few seconds to initialize and that message indicates that it's ready to go.