Slightly Stumbling Idle - HELP!!!

Reply Subscribe

Thread Tools

Search this Thread

Jan 24, 2005 | 07:53 PM

KayCee

Thread Starter

Advanced

Joined: May 2004

Posts: 66

Likes: 0

From: Crockett CA

Slightly Stumbling Idle - HELP!!!

Have a very annoying slight stumble while idling in gear on a stock 95 LT1 A4. I checked all of the vacuum lines. The fuel pressure is 41 lbs, which is the minimum spec. Would this be cause for poor idle?

Jan 24, 2005 | 08:08 PM

twkeough

Instructor

Joined: Jan 2004

Posts: 157

Likes: 0

From: marshfield ma

How many miles? check for any codes? could be a few things, IAC, dirty TB, injectors, wires to name a few.

Jan 24, 2005 | 08:57 PM

tempest

Burning Brakes

Joined: Aug 2001

Posts: 1,238

Likes: 0

From: walled lake MI

did you notice the fuel pressure dip when it stumbles? if so i would suspect the fuel pump.

Jan 24, 2005 | 09:12 PM

KayCee

Thread Starter

Advanced

Joined: May 2004

Posts: 66

Likes: 0

From: Crockett CA

Car has 125,000 on the clock. I replaced the IAC, cleaned the TB. Replaced the OptiSpark and the wires a couple of months ago. This started about 2 weeks ago. There is no engine service lights on. Can you throw a code without triggering the service engine lights?

Thanks

Jan 24, 2005 | 09:43 PM

MikeC4

Melting Slicks

Joined: Oct 2004

Posts: 2,510

Likes: 4

From: Austin Texas

Quote:

Originally Posted by KayCee

I had the same problem with my '95, and yes, you can have codes thrown w/o SeS coming on. I had codes H22, H44, H64, which is TPS, lft O2 sensor and rht O2 sensor. Turned out to be my TPS was faulty. You can get the codes by shorting pin 4 and pin 12 with a bent paper clip on your ALDL. With engine off, short these 2 pins, then turn ignition to "on", but do not start engine. The codes will pop up where your fuel gauge is. The first code you will see is C12, which is not an error, this is only a start indicator. codes will cycle through one by one, and when it is finished a C12 will appear again, and you are finished.

your ALDL connector type would be the 16-pin type:
http://www.obd1.com/

and you can get codes for your '95 & engine type here:
http://www.troublecodes.net/GM/

good hunting!

Last edited by MikeC4; Jan 24, 2005 at 10:01 PM.