Bandit's Surging/Poor Idle - Page 9 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 11-15-2006, 09:08 PM   #81
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Quote:
Originally Posted by Maymybonneliveforever
Quote:
Originally Posted by bandit
Quote:
Originally Posted by Maymybonneliveforever
Bandit, I'm having the same 2 problems as you are. How did you test and fix the egr problem? Keep in mind that I don't have a scanner or what ever Meter you used.
there is a Plug that plugs in to the Top side of the EGR, Unplug it,Drive around, see if the problem goes away. If so.. You can try cleaning it. But that didn't work on mine.
So go to the Yard and get a New used one of Pay the $100+ for a new one.
Or i know someone will chime in on i forget his name that has rebuilt ones.

I haven't "fixed" my problem yet, i just know how to fix it
Didn't you say you fixed the problem when you take off from idle?
He didn't fix the problem... But he did a test to see if there may be a fault with the EGR causing the Chug Sputter at takeoff... With it unplugged( inop ) he did not have the issue..

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Old 11-15-2006, 09:09 PM   #82
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Quote:
Originally Posted by Maymybonneliveforever
Quote:
Originally Posted by bandit
Quote:
Originally Posted by Maymybonneliveforever
Bandit, I'm having the same 2 problems as you are. How did you test and fix the egr problem? Keep in mind that I don't have a scanner or what ever Meter you used.
there is a Plug that plugs in to the Top side of the EGR, Unplug it,Drive around, see if the problem goes away. If so.. You can try cleaning it. But that didn't work on mine.
So go to the Yard and get a New used one of Pay the $100+ for a new one.
Or i know someone will chime in on i forget his name that has rebuilt ones.

I haven't "fixed" my problem yet, i just know how to fix it
Didn't you say you fixed the problem when you take off from idle?

Quote:
Originally Posted by bandit

Ok.. I did the EGR test.
Yup as far as one of my problems it fixed.
The problem where I hold the brake in Drive, Give it a little gas and chug / sputter.. That went away.

And i confirmed that unplugging the EGR fixed the Low speed/idle problem by plugging it right back in and starting it up and it did the Chug again.

So looks like i might have two problems, EGR and TPS.
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Old 11-15-2006, 09:09 PM   #83
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Ok thanks jr3800 and bandit, so if I unplug mine and the chugging goes away then it'* the EGR?
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Old 11-15-2006, 09:11 PM   #84
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Maymybonneliveforever- Yes, but make sure you test all speeds, cuz it did not fix every thing
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Old 11-15-2006, 09:16 PM   #85
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I seem to have both of your problems, both coming off of idle and at cruising speed. The one at cruising speed seems to have started when I changed the TPS ( I replaced it with a used one).
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Old 11-15-2006, 09:28 PM   #86
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Quote:
Originally Posted by Maymybonneliveforever
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Originally Posted by bandit
Maymybonneliveforever- Yes, but make sure you test all speeds, cuz it did not fix every thing
I seem to have both of your problems, both coming off of idle and at cruising speed. The one at cruising speed seems to have started when I changed the TPS ( I replaced it with a used one).
or still can be the EGR for all i know, when i replace mine ill let you know if it fixes both
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Old 11-15-2006, 09:33 PM   #87
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Keep me posted.
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Old 11-15-2006, 10:12 PM   #88
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Wow, all these quotes inside a quote, inside a quote, inside a quote give me a headache!

Bandit, you may have only one problem...EGR. With it unplugged the problem is gone at idle but back at cruising speed with the torque converter locked. A locked torque converter will greatly magnify the slightest of any engine misfires or rough running condition because it took the "cushion" out and replaced it with a solid link in the transmission.

I know you did this test with the EGR unplugged at cruising speed, but there is still exhaust backpressure to throw into the equation here too. If the EGR valve return spring is weak, the valve may open without a signal from the PCM just by the exhaust pressure between the engine and the catalytic converter.

There are a few ways to accurately diagnose this.

1. You know the EGR is bad, replace it with a KNOWN good unit and test drive.
2. Remove the EGR valve and plug both ports with a fabricated metal plate and gasket and see if the cruising speed problem reappears.
3. This may not be accurate if the position sensor inside the EGR is faulty, but using your AutoXray, record the "actual" and "desired" EGR positions and graph them like you did earlier with the other sensors, and then post them here. They should be VERY close to one another at ALL times.
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Old 11-15-2006, 10:49 PM   #89
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Take off that hot exhaust injection system and throw it in the trash

......and we touch on the old argument of EGR vs Non EGR.


I ditched my EGR a few years ago and have not looked back. Seems there are more issues running with it than without it.
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Old 11-15-2006, 10:57 PM   #90
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Chart 1

EGR Position | 0.0| %
EGR Position | 0.0| %
EGR Position | 0.0| %
EGR Position | 0.0| %
EGR Position | 0.0| %
EGR Position | 0.0| %
EGR Position | 0.0| %
EGR Position | 0.0| %
EGR Position | 23.7| %
EGR Position | 23.7| %
EGR Position | 23.7| %
EGR Position | 0.0| %
EGR Position | 0.0| %
EGR Position | 7.0| %
EGR Position | 7.0| %
EGR Position | 0.0| %
EGR Position | 0.0| %
EGR Position | 4.2| %
EGR Position | 4.2| %
EGR Position | 4.2| %
EGR Position | 19.8| %
EGR Position | 19.8| %
EGR Position | 21.0| %
EGR Position | 21.0| %
EGR Position | 27.3| %
EGR Position | 27.3| %
EGR Position | 23.7| %
EGR Position | 23.7| %
EGR Position | 44.8| %

Desired EGR Posn | 0.0| %
Desired EGR Posn | 0.0| %
Desired EGR Posn | 0.0| %
Desired EGR Posn | 0.0| %
Desired EGR Posn | 0.0| %
Desired EGR Posn | 0.0| %
Desired EGR Posn | 0.0| %
Desired EGR Posn | 0.0| %
Desired EGR Posn | 13.6| %
Desired EGR Posn | 13.6| %
Desired EGR Posn | 13.6| %
Desired EGR Posn | 15.2| %
Desired EGR Posn | 15.2| %
Desired EGR Posn | 17.1| %
Desired EGR Posn | 17.1| %
Desired EGR Posn | 18.3| %
Desired EGR Posn | 18.3| %
Desired EGR Posn | 23.0| %
Desired EGR Posn | 23.0| %
Desired EGR Posn | 23.0| %
Desired EGR Posn | 28.0| %
Desired EGR Posn | 28.0| %
Desired EGR Posn | 26.1| %
Desired EGR Posn | 26.1| %
Desired EGR Posn | 23.4| %
Desired EGR Posn | 23.4| %
Desired EGR Posn | 31.5| %
Desired EGR Posn | 31.5| %
Desired EGR Posn | 49.1| %



Chart 2

EGR Position | 44.8| %
EGR Position | 70.2| %
EGR Position | 41.3| %
EGR Position | 76.4| %
EGR Position | 69.0| %
EGR Position | 70.2| %
EGR Position | 32.3| %
EGR Position | 21.4| %
EGR Position | 29.6| %
EGR Position | 10.9| %
EGR Position | 33.1| %
EGR Position | 33.1| %
EGR Position | 23.4| %
EGR Position | 66.6| %
EGR Position | 29.2| %
EGR Position | 22.6| %
EGR Position | 38.6| %
EGR Position | 7.8| %
EGR Position | 14.0| %
EGR Position | 14.0| %
EGR Position | 18.7| %
EGR Position | 70.5| %
EGR Position | 30.8| %
EGR Position | 35.8| %
EGR Position | 27.3| %
EGR Position | 62.0| %
EGR Position | 54.2| %
EGR Position | 59.2| %
EGR Position | 83.8| %

Desired EGR Posn | 51.8| %
Desired EGR Posn | 81.9| %
Desired EGR Posn | 83.4| %
Desired EGR Posn | 68.2| %
Desired EGR Posn | 62.7| %
Desired EGR Posn | 64.3| %
Desired EGR Posn | 33.9| %
Desired EGR Posn | 27.6| %
Desired EGR Posn | 28.8| %
Desired EGR Posn | 31.5| %
Desired EGR Posn | 31.2| %
Desired EGR Posn | 31.2| %
Desired EGR Posn | 40.1| %
Desired EGR Posn | 63.5| %
Desired EGR Posn | 33.1| %
Desired EGR Posn | 40.9| %
Desired EGR Posn | 38.6| %
Desired EGR Posn | 25.3| %
Desired EGR Posn | 53.0| %
Desired EGR Posn | 53.0| %
Desired EGR Posn | 22.2| %
Desired EGR Posn | 51.4| %
Desired EGR Posn | 15.9| %
Desired EGR Posn | 48.7| %
Desired EGR Posn | 34.7| %
Desired EGR Posn | 35.4| %
Desired EGR Posn | 63.9| %
Desired EGR Posn | 65.5| %
Desired EGR Posn | 73.3| %
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