'92 Stumbling, Idle Problems, No Power - 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 03-27-2008, 01:13 AM   #1
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Default '92 Stumbling, Idle Problems, No Power

Hello, I'm new here, so a little intro. I've got a stock, naturally aspirated 1992 SE Bonnie with about 198,000 on the clock. It has... well... a few problems.

It starts up great and runs just fine until the temperature gauge reaches just above 100 degrees. Once the engine is slightly above 100 degrees the idle starts to surge and often dies if I don't give it gas, it has no power in the lower RPMs, and pings/misfires/pre-detonates sometimes when I give it a lot of gas. If I can get it to above 3000 RPMs or so it typically takes off like a rocket.

It continues to run crappy until the temp gets up to about 200 degrees, then it usually runs fine again. On a few occasions it doesn't seem to have as much power and has to downshift in order to maintain interstate speeds.

I've replaced the fuel filter, air filter, O2 sensor, spark plugs, and wires within the last six months. I've also swapped in a junkyard throttle body assembly (with a cleaned MAF, throttle position sensor, etc.). Nothing has seemed to have helped.

The last fill-up I got 16.5 mpg, driving like my grandma about 50% city/50% interstate.

Any help you guys could give me would be great, as I'm at about my wits end. Thanks in advance!
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Old 03-27-2008, 10:19 AM   #2
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It will help the guys a lot if you can check to see if you have any codes stored. Or have you already checked that? In this section of the Techinfo, there is a procedure for retrieving in one post and in another, a listing of definitions for your Bonnie:
http://www.bonnevilleclub.com/forum/...ode=cat&cat=12
Here is a picture of the connector. Pins A&B are for displaying codes. A bent paper clip works great. But if unfamiliar, be sure to read the procedure first.
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Old 03-27-2008, 02:58 PM   #3
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Sorry, I haven't checked for codes yet. I haven't gotten a check engine light for I don't know long. I imagine the computer stores codes that don't throw CEL, just like most cars though.

I'll try to check for codes when I get off work, if it will stop snowing/sleeting for half an hour. I hate Iowa! I'll be sure to check them by Friday afternoon.

Thanks for the link by the way.
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Old 03-27-2008, 03:43 PM   #4
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Default Re: '92 Stumbling, Idle Problems, No Power

Quote:
Originally Posted by Mr. Hawver
... the idle starts to surge and often dies if I don't give it gas, it has no power in the lower RPMs, and pings/misfires/pre-detonates sometimes when I give it a lot of gas. If I can get it to above 3000 RPMs or so it typically takes off like a rocket.

It continues to run crappy until the temp gets up to about 200 degrees, then it usually runs fine again. !
Knowing one way or the other on the codes is a good starting point. Did this come on suddenly or has been progressively getting worse? Do you have access to a fuel pressure gauge?

This thread shares some of the symptom but was coding (O2). Yours may be running lean like this one (By the way, Bosch O2s have a very bad reputation here.
http://www.bonnevilleclub.com/forum/...562&highlight=
Of course, you may have multiple issues. The above thread also shows where the computer'* ground is located. That is something to check, clean & tighten w/o spending a lot of time. You will also see a lot of discussion on looking for vacuum leaks. Either way, we will need more facts. I am only offering this side info in order to check some easy stuff while waiting for post replies from the REAL experts. BTW...I transplanted from Winterset, IA 34 years ago. Have yet to miss the winters. Now, AUG in Memph'o is another story.
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Old 03-27-2008, 03:57 PM   #5
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In reading this I really don't get a good enough feel to offer advice yet, but one thing I know that I personally would check in your case, is the thermostat, along with the few other items mentioned by RedSled above.
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Old 03-28-2008, 07:00 PM   #6
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Well, I ran my codes and the only thing that came up with was 58. Which happened to correspond to "Personal Automotive Security System ( PASS Key ) Fuel Enable Circuit," which means nothing to me. My ground looked like it was in pretty good condition, but I cleaned it up anyway.

It came on suddenly. I filled up with gas one day in the fall and it started to have all the problems I mentioned above, except it wouldn't run worth a crap, no matter what the temperature was. I had never really had any problems with it before. Well, I take that back, when I would drive it home on the interstate (60 miles or so) every 2 or 3 trips it would act like it didn't have any power for a while and the CEL would come on. If I took an off ramp and idle for 30 seconds or so it would run normally the rest of the way.

My replacement O2 sensor was a Bosch.
Should I look into getting a different one? If so, what company makes a good one? Thanks
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Old 03-28-2008, 10:01 PM   #7
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Yes, get rid of the Bosch O2. Of course Delco is a good one, and I have heard others using the Denso. http://www.rockauto.com has a Delco unit. I paid about $48 plus not quite $11 for 2-day shipping. My 93 uses #AFS76.
http://www.gmpartsdirect.com/ has them even cheaper at about $31; same for shipping, but don't think it is 2-day. Didn't find that one until I had already ordered via Rockauto. Here'* a thread from the Lounge of how to get a 5% discount. http://www.bonnevilleclub.com/forum/...kauto+discount
  • 1.Your problem history of months ago ring of junk in the gas, probably plugging the fuel filter. But I see you have replaced that.
    2.While you are waiting for the O2, might as well check one more ground bus (junction that is not screwed to chassis). It carries ground to the fuel pump and has had a history of corrosion. It is under the carpet at the driver side door sill. Look for something that has several wires connected together, all having female spade connectors, hooked to a multi-pin (male spades) piece of metal. Here is something with pix
    http://www.bonnevilleclub.com/forum/...=article&k=102

    3. One more thing to try; you will get CEL doing it. Unplug the MAF and see if it gets better or worse.
Be hearing from you.
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Old 04-02-2008, 07:46 PM   #8
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Well, I got a new code when I was driving the other day... "13--O2 Open Circuit" Looks like I need to order a new (good, not Bosch) one.
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