EGR Problem - Page 2 - 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 07-23-2007, 05:36 PM   #11
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Quote:
Originally Posted by bigbadbonneville
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Originally Posted by willwren
Is that a constant code, or does it only toggle when you put your foot on the brake?

(I'm going to be very hit and miss today due to WCBF kicking off, but I'll try to stay on top of this topic).

Keep in mind your car only uses 2 of the 3 valves. I don't recall which two until I can get to my FSM'* at home later today.
Yes constant code for 26 - It use to run great with the old EGR valve but failed on emissions, after replacing the egr - it never ran the same. rough - What does the quad driver module have in relations to the egr.
The Quad driver in the PCM drives various relays, and solenoids, Such as the EGR solenoids... On the 93 SSEi, I believe that you will only use 2 of the 3 solenoids... 1 of them is not used..

But the TCC and if it has it the PWM as well as the A and B shift solenoids, EVAP solenoid.... On and on.. There are many things that are driven by the PCM right down to the injectors...

But you will need to find out what quad driver you are having issues with and narrow it down from there.. That way you can check everything on that circuit

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Old 07-23-2007, 05:43 PM   #12
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Quote:
Originally Posted by jr's3800
Quote:
Originally Posted by bigbadbonneville
Quote:
Originally Posted by willwren
Is that a constant code, or does it only toggle when you put your foot on the brake?

(I'm going to be very hit and miss today due to WCBF kicking off, but I'll try to stay on top of this topic).

Keep in mind your car only uses 2 of the 3 valves. I don't recall which two until I can get to my FSM'* at home later today.
Yes constant code for 26 - It use to run great with the old EGR valve but failed on emissions, after replacing the egr - it never ran the same. rough - What does the quad driver module have in relations to the egr.
The Quad driver in the PCM drives various relays, and solenoids, Such as the EGR solenoids... On the 93 SSEi, I believe that you will only use 2 of the 3 solenoids... 1 of them is not used..

But the TCC and if it has it the PWM as well as the A and B shift solenoids, EVAP solenoid.... On and on.. There are many things that are driven by the PCM right down to the injectors...

But you will need to find out what quad driver you are having issues with and narrow it down from there.. That way you can check everything on that circuit
Will a radiator coolant sensor be a cause to that - due to the information system says "low coolant", which is not true due to the fact I just put a brand new GM radiator (Heavy Duty for SSEI). and what does Solenoid 1 do on the EGR if only 2 out of the 3 only work - has to have a reason why there are 3 solenoids on it. Sorry I'm clueless when it comes to this.
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Old 07-23-2007, 06:58 PM   #13
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You will have to monitor the solenoid actuation... They should function while the car is in gear, and under load... at idle in park they should not have any actuation...

I have seen some cars that us only 2 of the solenoids... I believe this to be the case with the SSEi...

Have you tried unplugging the EGR and seeing if it idles ant better? I wouldn't do this for long periods, but its fine for testing purposes...

Also its hard to tell whats causing the rough idle...

Throttle Body, IAC channel and the MAF could most likely use a good cleaning... Its still possible for you to be having issues withh the EGR..

where did you get the EGR?

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Old 07-24-2007, 04:56 PM   #14
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Quote:
Originally Posted by jr's3800
You will have to monitor the solenoid actuation... They should function while the car is in gear, and under load... at idle in park they should not have any actuation...

I have seen some cars that us only 2 of the solenoids... I believe this to be the case with the SSEi...

Have you tried unplugging the EGR and seeing if it idles ant better? I wouldn't do this for long periods, but its fine for testing purposes...

Also its hard to tell whats causing the rough idle...

Throttle Body, IAC channel and the MAF could most likely use a good cleaning... Its still possible for you to be having issues withh the EGR..

Thanks for the info. I did get a new MAF sensor and cleaned out the Throttle body but not a new IAC. (next on my list). I bought the EGR from King Pontiac dealership. I used the scanner again and still same results. Cleared all codes expect that QDM code - 26. I yet to pin point where thats coming from and why my car seems to run rough at Idle. Would a faulty fuel pump or crank sensor be a culprit to this?

where did you get the EGR?
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Old 07-25-2007, 02:21 PM   #15
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Quote:
Originally Posted by jr's3800
You will have to monitor the solenoid actuation... They should function while the car is in gear, and under load... at idle in park they should not have any actuation...

I have seen some cars that us only 2 of the solenoids... I believe this to be the case with the SSEi...

Have you tried unplugging the EGR and seeing if it idles ant better? I wouldn't do this for long periods, but its fine for testing purposes...

Also its hard to tell whats causing the rough idle...

Throttle Body, IAC channel and the MAF could most likely use a good cleaning... Its still possible for you to be having issues withh the EGR..

where did you get the EGR?
Thanks for the info. I did get a new MAF sensor and cleaned out the Throttle body but not a new IAC. (next on my list). I bought the EGR from King Pontiac dealership. I used the scanner again and still same results. Cleared all codes expect that QDM code - 26. I yet to pin point where thats coming from and why my car seems to run rough at Idle. Would a faulty fuel pump or crank sensor be a culprit to this?
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Old 07-25-2007, 02:31 PM   #16
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What does code 26 stand for? There'* information here on the club in techinfo that might help you much further.

For example...I had a 95 pushing a QDM that contained the soleniods for boost, TCC and evap. I narrowed it down to the boost controller that appeared to be functioning fine. There'* more than just the EGR on that QDM and you need to research it. I would suggest checking Techinfo and searching on that code and see what others encountered for possible diagnostic aids.

BTW.. your coolant sensor saying you are low...can not be diagnosed by knowing you have a new radiator. Even new radiators can leak.. the sensor however is known to be a load of fun and should be cleaned before putting it into a new rad. They sometimes get gunked up.
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Old 07-25-2007, 02:37 PM   #17
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Quote:
Originally Posted by BillBoost37
What does code 26 stand for? There'* information here on the club in techinfo that might help you much further.

For example...I had a 95 pushing a QDM that contained the soleniods for boost, TCC and evap. I narrowed it down to the boost controller that appeared to be functioning fine. There'* more than just the EGR on that QDM and you need to research it. I would suggest checking Techinfo and searching on that code and see what others encountered for possible diagnostic aids.

BTW.. your coolant sensor saying you are low...can not be diagnosed by knowing you have a new radiator. Even new radiators can leak.. the sensor however is known to be a load of fun and should be cleaned before putting it into a new rad. They sometimes get gunked up.
Awesome info. I will check that boost controller, I did have a hunch it might be, even though it is working properly and with the radiator low coolant sensor, should I just replace it ( Heck I think I will just for good ole sake). Thanks great info guys.
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Old 07-25-2007, 03:06 PM   #18
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BigBad..

Please..reread what I wrote. I DID NOT say your issue might be a boost controller. I said you need to read more and use the search function. Also told you that the sensor can probably be cleaned up ...AFTER you check the coolant level wtih visual inspection.

Now..I'm overstressing my points above, not to be a jerk..but get your attention. If my example said fuel pump...I would not have a good feeling if you started checking that. It'* time to do research and find out what is on that QDM besides the EGR.
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Old 07-25-2007, 04:47 PM   #19
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Quote:
Originally Posted by BillBoost37
BigBad..

Please..reread what I wrote. I DID NOT say your issue might be a boost controller. I said you need to read more and use the search function. Also told you that the sensor can probably be cleaned up ...AFTER you check the coolant level wtih visual inspection.

Now..I'm overstressing my points above, not to be a jerk..but get your attention. If my example said fuel pump...I would not have a good feeling if you started checking that. It'* time to do research and find out what is on that QDM besides the EGR.
Thanks I will do that and no your not being a jerk about it but giving wise info for all members to learn from. But for the boost controller I did have a problem with it at one time acting up but return back to normal.
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Old 07-25-2007, 04:54 PM   #20
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If you find it'* on the same QDM, send me a pm.. I've got a couple laying around. I could send one out as a test mule.
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