Stumbling, Surging, Hesitation ** FIXED ** - Page 4 - 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 03-17-2008, 08:34 PM   #31
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OK, after putting o-ring in PCV valve, new pcv valve, new vacuum fitting, new ac delco o2 sensor, new belken blue plug wires, new tr55 ngk plugs, (o2 and plug wires not touching anything), cleaned MAF, totally cleaned TB ( take off car) : ( Coil packs tested per techinfo aswell ) NEW IAT sensor aswell( from a junker ) bc the one that was on the car was heavily soiled as it was NOT in the air box but rather dangling....

the car can now be given 80% throttle, and run at about 1psi of boost or less and run PERFECT, as soon as i give it WOT or full boost it hesitates and kinda surges a little bit. Same issue but lessened and more throttle can be given to it before stumbles.

Any ideas?

Thanks in advance
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Old 03-17-2008, 08:44 PM   #32
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Test your fuel pressure and report the numbers back here:


1. Key on, motor off, wait two seconds for the pump to prime, then repeat 2 more times (key to 'on' but not started, wait two seconds, key off, key on, wait two seconds, etc). Three 2-second primes, and record the fuel pressure.

2. At idle. Record the pressure.

3. At idle with the vacuum line pulled off the FPR.


Let us know what those three numbers are.
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Old 03-17-2008, 08:48 PM   #33
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I appreciate that, and ill jump on getting those numbers..

BUT

I have no idea how to test that, and I dont know what the FPR is.

I will search in the mean time...

Thanks in advance !
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Old 03-17-2008, 08:49 PM   #34
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You need a fuel pressure gauge. Actron makes one. You may be able to rent/borrow from your parts store. It'll hold your reading until you push the 'release' button (make sure the clear hose is away from anything you don't want fuel on).

FPR is fuel pressure regulator. It'* the round thing attached to your fuel rail that has a vacuum line going to it.
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Old 03-17-2008, 09:01 PM   #35
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Thanks for the quick reply, whats the easiest way to pull codes from the 93 ssei? all of the stores around here want to charge 100 bucks, and it doesnt store the codes, right?

None of the auto stores will let me "borrow" one, but i have a buddy who might hellp me out ( he works on marine turbo diesel motors, im sure he can figure it out though
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Old 03-17-2008, 09:06 PM   #36
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Click the TECHINFO link at the top of the page, then select ELECTRICAL, then COMPUTER.

Your procedure is there to pull codes. You have the last year you don't need a scantool for.
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Old 03-17-2008, 09:07 PM   #37
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That was happening to mine last week. Check and see if all the electrical clips are attached to the fuel rail. Mine must have come off when my tension pulley wheel exploded.
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Old 03-17-2008, 09:11 PM   #38
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Those are connectors for your fuel injectors. It'* very uncommon to see an issue with those, especially in this case, when the car runs just fine under most conditions. If he were on less than 6 injectors at all times, he'd know it.
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Old 03-17-2008, 10:23 PM   #39
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no codes when i checked.. im going to try and get a shop to test my fuel pressure as described a few replies UP, thanks again guys.
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Old 03-17-2008, 10:32 PM   #40
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Make sure you print those three scenarious. We need all 3 sets of numbers. They're very specific based on our knowledge of problems in this realm.
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