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Prev Professional Automotive Repair Technical Discussions for August 4, 2008
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Open Help Requests for GM
Help Request Answers
1996 Buick Roadmaster Estate Wagon Collector's Edition 5.7L Hesitation, Surge VIN: 1G4BR82PXT
Very strange problem on a 5.7 Buick RoadMaster . This vehicle will hesitate and or buck sometimes worse than others and sometimes not at all .. Looking at scan data I was able to detect a very intermitant missfire on #1 when it acts up . I pulled the plug look...
1998 Chevrolet S10 LS 4.3L Misfire VIN: 1GCDT19X6W
Customer brought it in for the rebuilt heads to be installed We did this without complication. Started up and ran good when done. After it warmed up the check engine light came on and the number 2,4, and 6 cylindersstarted missing. We went through and checked ... Trouble codes: P0300
2000 Chevrolet S10 2.2L radio VIN: 1GCCS1442Y
Hello, everyone. Looking for some help. Have this radio on loc and of course customer has no code. I retrieved scrambled codes from radio 652 and 664. Does any one know the actual code for this radio. Having a tech 2 or being an authorized delco distributor st...
2001 Chevrolet Silverado 1500 4.8L Surge VIN: 2GCEC19V11
We have a surging 4.8 (looks alot like a 5.3) here that has a bad surging symptom. Fuel trims are high, smoked intake to no avail but replaced intake gaskets, cleaned throttle body and IAC, then replaced IAC to no avail. Fuel guage drops to empty erratically b... Trouble codes: P0463, P0171 (lean), P0174 (lean)
2002 Chevrolet Malibu 3.1L Alternator VIN: 1G1ND52J92
This car got a jump start at a local bar. Apparently one of the drunks hooked the cables up backwards because witnesses said 'sparks flew out everywhere'. Customer bought a new battery the next day only to find the alternator was not charging. Another shop too...
1992 Oldsmobile 88 Royale 3.8L No Start VIN: 1G3HN53L8N
car can be driven 5 to 10 miles. when cut off it will not start until about 30 mins later. very repeatable. if driven much more than ten miles it will cut off going down the road. then it will not start for an hour or better. i idled it in the yard twice for m... Trouble codes: 17 (rpm signal)
1993 Oldsmobile 88 Royale 3.8L Poor Idle Quality, Hesitation, Surge VIN: 1G3HN53L3P
hey guys for looking atr my post have a tough one this cam in from another shop experiencing very firing kv on three cylinders 2-4-6 the reading are 39.3-31.5-26.5 car runs rough and pops through intake very gently no plug cat or muffler exhaust was found i ha...
1997 Pontiac Bonneville SE 3.8L keyles entry VIN: 1G2HZ52K9V
I remember reprogramming the fob's by jumping two of the obd connector wires. I don't remember which ones, and the relearn procedure. Key on, unlock doors, push ulock then lock? My memory is getting worse. Thanks
1997 Pontiac Sunfire SE 2.2L lack of power
hey everyone, I have a 97 pontiac sunfire that I am working on. Just got it in, supposedly the lady took it to another shop, and they said it needed a motor, well i pushed it in hooked up the jump box for good times sake, and it started, no knocking or anythin...
1998 Pontiac Bonneville SE 3.8L Stall VIN: 1G2HX32K0W
This Pontiac intermittently stalls an decell without warning and flags a po102 code. At this point we have checked everything related to the maf code. The one thing we now notice or suspect is fluctuating computer data with the KOEO. Just sitting the TPS volta... Trouble codes: 102 (maf sensor)

Fixes & Summaries for GM
Fix/Summary Answers
2003 Cadillac DeVille 4.6L starter VIN: 11G6KD54X5
first i want to thank everyone who replied,everyone said it was a bad connection,as i stated in my post i was looking for a bad ground.after cleaning all grounds for a 3rd time with same results.i took ground cable that runs to alt an body on the rt. side of c...
1995 Chevrolet Camaro Z28 5.7L Excessive Emissions, Hesitation, Cuts out, Misfire VIN: 2GIFP22P95
We verified the distributor issue today by swapping his Pickup unit with the base from my personal car's core and it fired right up, made good rpm jumps, idled better and the timing was right in the spec range. For those who didn't see the update, The upper a...
1998 Chevrolet Express 2500 LS 5.7L alarm / passlock VIN: 1GCGG25R7W
Well, Dan and Mike hit it right on the head ! The aftermaket cylinder (Carquest US214L) didnt contain the magnet needed to start the van. But, if you search that number, it supersede's to a new number (US227L) that containts that one little magnet. So, i gues...
1999 Chevrolet Malibu LS 3.1L Park Lights VIN: 1G1NE52J2X
After connecting the Modis and checking for body codes, the lights went out and did not come back on as before. However, I took the advice of several who replied stating that the BCM was the culprit gave the info to the customer for thir decision. Customer ele...
2001 Chevrolet Tracker LT 2.5L radiator VIN: 2CNBJ63471
I am calling this one fixed, I would not have believed that the sludge like material in the engine and radiator was Dexcool ran low and the mixture of green coolant. But, after flushing and flushing and flushing, I mean like 6 times, it finally came clean enou...
2001 Chevrolet Silverado 2500 HD 8.1L 2-3 upshift VIN: 1GCHK29G71
I think we have this one nailed down. We think that the rear output speed sensor in the transfer case was sending out a crazy signal intermittently. That is the only thing that we could nail down that the dealership didn't take care of. The damage was alrea...
2002 Chevrolet S10 LS 4.3L Misfire, MIL Lamp on VIN: 1GCDT13W12
I would like to thank Kent from Florida for the idea of making a tool to measure piston height. Made the tool and determined that #2 piston is lower than #4. Installed a good used engine and problem is fixed. Removed the right cylinder head and measured piston... Trouble codes: P0300 (Random misfire detected).
2005 Chevrolet Express 2500 4.8L No Start VIN: 1GCGG25V95
I ended up farming this van out to a local speacialty shop due to a lack of some equipment. As I said before, the confusing part of the whole deal was the lack of communication with the scanner and just having the injector pulse every now and then. Even then i...
2007 Chevrolet Tahoe LTZ 5.3L alternator VIN: 1GNFK13077
Hello, Most replies referred to tsb's or a recall, I checked the vin thru GM and as far as I can tell, It is a normal situation, I will post more if the vehicle has any symptoms, thank you all for taking the time to respond.
1999 GMC Safari SL 4.3L Misfire VIN: W3XB511098
ended up the #4 fuel injector was not misting the fuel. it passed a pressure drop test but caused a miss on medium load. replaced injector and poppet assm. and all is fine. Trouble codes: P0300.
2000 Oldsmobile Bravada 4.3L converter VIN: 1GHDT13W5Y
Thanks for all the replies, I did put a pressure guage on it as suggested and watched when the problem was there and the pressure held solid. I went through the valve body and installed all the sonnex valves for the tcc and that made no differnce so I pulled t...
1984 Pontiac Fiero SE 2.5L Engine VIN: 1G2AF37R7E
Well, most of you nailed it. It was indeed a spun rod bearing. I can't explain it, but it did NOT show up during a cylinder balance test, and the noise was not like any rod bearing I had ever heard (I've been doing this 20+ years). But the customer finally app...
1996 Pontiac Grand Am SE 2.4L Misfire VIN: 1G2NE52T1T
Thanks to all for your suggestions. This vehicle in particular goes to show that you cannot always trust new parts. Installing all AC Delco ignition parts took care of the problem. Using the test wires and my ignition scope on my Modis allowed me to recognise...
1998 Pontiac Bonneville SE 3.8L Stall VIN: 1G2HX32K0W
Thanks to all who replied. We pretty much covered all the sugestions and at this point have not yet cured the problem. having said that we are going to repost the problem because we have new info. Trouble codes: P0102.
2004 Pontiac Grand Prix GT2 3.8L Blower Motor Module VIN: 2G2WS52294
Thanks for all of the great help. Although it didnt make alot of sense, as the blower motor was showing only 10 amps as the draw, I replaced the blower motor. I have not heared from the customer yet so I'm hoping that it fixed the problem. I did notice that th...
2002 Saturn LW300 3.0L MIL Lamp on VIN: IG8JW84R12
some of the replays allready were all ready doun on my request'tps was replace dinot made eny diference realern tps dinot made eny diference,i guez i dinot explian to well on my request the pcm has not bein replace ,customer can come up $800.00 cost on ecm and... Trouble codes: P1516.
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