running bad under load - 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 10-25-2014, 07:41 PM   #1
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Default running bad under load

95 Bonnie SE. New irridium plugs, new wires in correct order. Fires up just fine and idles nice and smooth. Rev'* fine in park/neutral. Idle is ok in drive. If I hold the rpms up from the ~850-900 that it idles at up to about 1100rpms it seems to bog and stumble like loading up and can't keep up. Once I let off it'* fine again.

I took a known working coilpack off my 00 GPGT and swapped it in one position at a time. No change. Then I swapped the ICM from my GP into it and no change.

It is showing a CEL, which of course I can't read due to the bastard 1.5 software on it and it won't drive well enough to get it somewhere to have it scanned. I've checked for vac leaks, cleaned both battery cables, cleaned the MAF, checked all the wiring to the injectors. Nothing looks out of place.

Until I can find a scanner that can read the codes where else can I look for issues? I need to get her back on the road before the winter.
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Old 10-25-2014, 07:42 PM   #2
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Verify your fuel pressure.
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Old 10-27-2014, 10:53 AM   #3
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anybody with that 1.5 i would suggest you get your own scanner, almost impossible to troubleshoot these newer vehicles without it. really need one with live data, and its not like obd2 where everybody has one you can borrow. i think actron makes one you might be able to find on ebay.

https://www.gmforum.com/trouble-shoo...-1-5-a-306289/
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Old 10-27-2014, 02:30 PM   #4
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I agree with checking the fuel pressure. Autozone and O'rilley'* sell a cheep fuel pressure gauge for less than 70 bucks.
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Old 10-27-2014, 07:06 PM   #5
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Want cheap? $31 at Sears...

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Old 10-28-2014, 08:17 PM   #6
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I rented the fuel pressure test kit at orilley'* yesterday. $119 later.... Haven't had time to get it done yet. Might pull it in the garage tonight and give it a try.

My Dad happened to come by on Sun. and I showed him what it was doing and I happened to notice that it only does it once it starts to warm up (per the temp gauge on the dash). Not sure if that helps but figured I'd mention it.
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Old 10-30-2014, 07:35 PM   #7
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Ok, here'* the rundown on the fuel pressure:

KO/EOff- 1st key cycle- 43lbs, 2nd- 50lbs, 3rd- 50lbs.
Let it sit for 10 minutes. Pressure bled down to 45 and stayed there.
KO/Engine running in Park- cold idle- 44lbs
in gear/idle warm- 44lbs
in-gear at full operating temp with rpms held up to 1100 when the stumble/choking occurs- 46/47lbs (pressure fluctuates a bit when it stumbles as expected).
Rev'* just fine at any temp in Park.
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Old 10-30-2014, 08:49 PM   #8
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Then your fuel pressure is fine.

Disconnect your battery for 10 minutes. While that is going on, remove your MAF sensor and clean it with MAF sensor cleaner ONLY, reinstall, reconnect your battery and retest.
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Old 10-30-2014, 10:56 PM   #9
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Will give it a try.

Also, since I don't like to just start throwing parts at things the next thing I'm buying is an Actron Super AutoScanner Kit CP9150, which I just found for a touch under $200 shipped. Should pay for itself in no time.
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Old 11-03-2014, 06:45 PM   #10
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Well, got my new toy today. Scanned it and came back with 3 codes. 2 of which were P0342- Cam Sensor Failure, and the other was P0341 Cam Sensor Intermittent Signal.

Time to go check the harness and make sure its clean and tight with no broken wires. I guess if all that checks out then a new Cam sensor it is.
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