P0131 code and rough idle - 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 03-20-2008, 05:15 PM   #11
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Default Re: Low O2 Voltage

Quote:
Originally Posted by 93RedSled-SSE
I was just reading up in my Funk & Wagnel and it states that the low voltage is referencing what the O2 is actually sensing and is not corrected after a period of xx minutes. Says it is running lean.
Here are some easy things to look for:
  • -Extra air at the intake (ie vacuum leaks) ... don't forget the purge canister connection.
    -Fuel starvation can cause, It also lists "LOW Fuel Pressure.". Maybe that 32 lbs is too weak.
    -Issues in the MAF sensor. Might try cleaning that. It says if you reset the code, unplug the MAF,and it clears up the code, that the MAF is bad. :(
    -Also, a poor Computer to engine block ground at the ICM stud. It is the lug with about 3 black wires grounded to it.
    -Of course flaky O2 wires/connections are in there too.
Hope that helps.
where is that ICM stud?
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Old 03-20-2008, 05:31 PM   #12
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The Ign. Control Module bracket/plate mounts to the engine block with 2 studs.
The front stud has the main ground cable from the battery on it.
The one closer to the alternator on non-SC has 3 smaller ground wires on it. There may be a sheet metal plate mounted between the 2 studs, sort of shielding the ICM harness. There are 2 nuts on each before you get to the cable. Found a drawing. see G100
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And on that EGR location
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Old 03-22-2008, 04:14 PM   #13
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Thanks for the pics. The mechanic that I brought it to found the problem, the break booster was bad, it was letting outside air in. I get it fixed on Monday and will let you know if it fixs the idle problem or not.
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Old 03-22-2008, 10:29 PM   #14
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Brake Booster deal is good to know. Motivates me to dig further into mine. Was ready to replace the booster months/weeks ago because it was leaking, when I got sidetracked with all my other drive train management problems. Was trying to disconnect the hose and temporarily plug for troubleshooting the other day. But it was stuck on so well that I was afraid of breaking the plastic pipes... so let it slide for a while. But now I better get after it. Thanks
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Old 03-23-2008, 08:27 PM   #15
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This is a bit off topic but I want to change the pcv cause I'm sure it hasn't been changed but don't know exactly where it is. I looked at your pics but it doesn't have it shown. What will changing the pcv do for my car....better gas mileage?
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Old 03-23-2008, 11:40 PM   #16
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The PCV is in sort of a weird place.
Easiest way to explain is; the decorative "3800" shield that clips onto the fuel rails, also locks onto a little tab at the passenger side.
That tab is part of an upright, plastic cylinder that contains the PCV.
Turn the lid CCW, about 1/8 turn to release it. It has an 0-ring seal on the lid and a coil spring that needs to be pulled out.
I used needle nose pliers to grab the PCV and pull it out.
There is an o-ring on the bottom section of the PCV. Don't loose the o-ring because replacement PCVs don't include one.

If one was to stick shut, your crankcase will pressurize and cause oil consumption issues.
I read someplace if one sticks open that it can effect idle.

I think I only paid $2 for one; so it is a cheap maintenance item.
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Old 03-26-2008, 01:01 PM   #17
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Thanks, the picture was really helpful. Where are you getting these pictures at, from the bonne service manual, I hear they are about $100 for the 2 books from the dealer?
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Old 03-26-2008, 04:15 PM   #18
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Yes, they are $105 for the pair on-line at either http://www.helminc.com or http://www.goodwrench.com/Tips/OwnerManuals.jsp. helminc.com is the official publisher. But believe it or don't, I fell into it and only paid $30 for the set. I swear they were on sale or something!
If you are going to hang onto your wheels for a while, it'* MORE than worth the full price. Had it for years and still finding stuff I didn't know was in there.
I also have an online subscription to alldatadiy.com too. But it is not as complete and can be hard to navigate.
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