'97 4.3 S10 bogging problem....FPR was bad, and inj. o-rings - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-26-2007, 10:48 PM   #1
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Default '97 4.3 S10 bogging problem....FPR was bad, and inj. o-rings

Ok, ever since I plugged in the plug on the CTS (coolant temp sensor) that was broken off, the car runs like total ***. No CEL anymore, tranny shifts great. It does NOT stutter/bog when taking off normally, but when attempting to WOT, or passing/ going over 2500-3000 rpm 3/4 throttle, it will bog and stutter, no backfiring, no flashing CEL. I just did a tune up on it today, but it did it before the tune up, after I plugged the CTS in. Unplugged it runs great but the CEL is on. So plugs, wires, cap, rotor, air filter are all ruled out. Anyone have a clue what it could be? I got good oil pressure, good battery voltage, idles perfect, etc.
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Old 03-26-2007, 10:50 PM   #2
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plugged a plug?

did you put a new sensor in? maybe im just not understand the problem
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Old 03-26-2007, 10:56 PM   #3
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No I didn't put a new sensor in. I found the sensor unplugged, thats why the CEL was on, so I fixed the broken plug and pulled the battery cable, put the cable back on, started it up, and the CEL was gone, but now it runs like crap.
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Old 03-27-2007, 01:27 AM   #4
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Also forgot to mention that it does have a new $400 ACDelco FP. There is a fuel leak, but I don't think enough to make it run crappy? it just seeps out of the line.
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Old 03-27-2007, 01:45 AM   #5
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Might be enough of a pressure drop to hurt it.


What'* pressure at?
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Old 03-27-2007, 01:47 AM   #6
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I didn't check it yet, but its not a bad idea to do so. I did hear that the CSFI system is extremely picky about its fuel pressure.
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Old 03-27-2007, 01:59 AM   #7
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That really does sound like a fuel pressure issue, especially since you say it only happens at high rpms/WOT situations.
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Old 03-27-2007, 07:56 AM   #8
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I agree, plus data is knowledge.

Check fuel pressure
Look for any vacuum leaks
A higher rpm clog like sound. Cat maybe? consider unscrewing the front O2 and starting it.. that should remove enough backpressure for a good test.
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Old 03-27-2007, 11:38 AM   #9
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Was the fuel filter replaced during your tune up?
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Old 03-27-2007, 11:56 AM   #10
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It was replaced in Dec. Truck has a new tank, pump and sending unit.
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