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Prev Professional Automotive Repair Technical Discussions for January 10, 2006
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Open Help Requests for GM
Help Request Answers
1989 Buick Skylark Limited 2.3L MIL Lamp on VIN: 1G4ND54D0K
This Buick Skylark - 1989 with a 2.3L engine (Quad 4), came in today with the complaint of check engine lite on but runs good. It had no lite on when I got in it, and it does run very good. The codes I retrieved were code 41 (No ign. 1X ref pulses ) and code 2... Trouble codes: 41 (No ignition 1X Reference Pulses), 26 (Quad Driver Module failure)
1982 Cadillac Seville 4.1L door locks VIN: 1G6AS6985C
It all started back in Aug 2005 my wife called the car wouldnt start..I drove to the office building parking lot & got it started with a jump from my car...I drove the Caddy back...and when I parked it all 4 door locks were clicking back & fourth and I could h...
1998 Cadillac Seville STS 4.6L alternator VIN: 1G6KY5491W
We recieved this car from another shop. They replaced the battery, and used an interstate oem replacement. Their customer took the car and the check charging system indicator came on and showed 16.2 volts charge, then it will drop back to an acceptable range. ...
2002 Cadillac Escalade 6.0L fuel gauge,battery light VIN: 1GYEK63N32
1993 Chevrolet Astro CL 4.3L Excessive Emissions, Poor Idle Quality VIN: 1GNEL19W9P
Car Came in as a no start. Scanner said coolant temp was -40c. We replaced the tempo sensor and the car started but idles rough especially when cold. We are getting code 32 "EGR error". The Egr valve looks new, and the customer confirmed it was replaced 3 mont... Trouble codes: 32 (EGR error)
1994 Chevrolet Blazer 6.5L No Start VIN: 1GNEK18S2R
Ha all I hope to get some help on this one I am at my witts end as I do not work on many disels. Vehicle was brought to me as an interment no start (normaly first thing in the morning). When I first tried to scan the truck I had no check engine lights and no c...
1996 Chevrolet C1500 Cheyenne 5.0L Excessive RPMs VIN: 2GCEC19M6T
There are about 2500- 2700 Rpms when clutch pedal is released in any gear when driving over 7 MPH. If IAC or VSS is disconnected, the symptom disappears. PID readings are all normal on my MODIS scanner. No vacuum leaks are present. The shop that had it replace...
1996 Chevrolet Tahoe LS 5.7L starter and flexplate teeth VIN: 1GNEK13R8T
We have this 1996 Tahoe. A year ago it developed intermittant, hard starting problems. It was a slow, hard start. At times, it would buck against the starter. It has broken one starter and some starter bolts. This was when we replaced the crank position sensor...
1999 Chevrolet Tahoe LS 5.7L transmission VIN: 1GNEK13R3X
I hope someone can help me with this, condition happened all at once, fluid level and condition is good, no codes are stored and all scan data reads normal. Reverse is there but you need to press the accelerator quite abit to get truck to move, it feels as if ...
2002 Chevrolet Tahoe LS 5.3L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNEK13Z72
hello this 02 tahoe is a flex fuel truck ,it came to us running very rough and blowing black smoke . I pulled codes and it had the codes ,I posted up top 1,3 5 7 cyl mis all on bank 1 .We did a smoke test for intake leak none found , checked fuel pressure seem... Trouble codes: P0300, P0171, P0131
2002 Chevrolet Silverado 1500 5.3L Hesitation, Cuts out VIN: 2GCEK19T82
Hello While driving down the road this truck will intermittently cut out. When it does the rpm guage drops slightly, and abs light comes on and the check engine light turns on briefly. Each time it cuts out it sets the trans range code and the abs code. When... Trouble codes: P172, P0175 (Fuel trim bank 2 rich), P706, C0237 (Rear Wheel speel signal erratic)
2002 Chevrolet Cavalier 2.2L No Start VIN: 1G1JC52472
hi guys, i have had this little cavalier passed on to me buy my father.he has had to put several fuel pumps into it. the fuel filter has been changed with each pump and the pumps are after market units [not airtex from what i understand]. i started going aft...
2002 Chevrolet Impala LS 3.8L No Start, hard start VIN: 2G1WH55K92
Car runs great after starting, has a extended crank time with a intermittent sputter & then will start.The air filter was original & choked up, I changed the fuel filter(some restriction but not clogged)& changed the spark plugs also. the first start after tun...
2002 Chevrolet Tracker 2.0L Engine VIN: 2CNBJ13C82
Light engine knock noise when engine hot. Checked for lifter problems; lifters seem ok. Viewed TSB on belt tensioner; Replaced Tensioner. Did not solve problem. When engine is running and warmed up, noise goes away when belt tension released. Pryed on front cr...
2003 Chevrolet Silverado 1500 HD LS 6.0L MIL Lamp on VIN: 1FMZV62E55
I have an '03 Chevy Heay duty half with a 6.0 in it . Codes p0120a and p2135a. I have already reaired several wires at the throttle body connector. The problem is very intermitant. I am a former GM tech and have never replaced a throttle body with this problem... Trouble codes: 120A, 2135 (throttel position sensor 1and 2 correlation)
1993 GMC K1500 Suburban SLE 5.7L front differential VIN: 1GKFK16K6P
Thank you for any help provided. This GMC has a noise in the front differential. I believe it to be a grinding in the actuator gears. The noise comes and goes; it will usually do it whenever you take off from a stop, but may do it at any time. If you put the v...
2000 GMC Yukon XL 1500 SLE 5.3L Misfire VIN: 3GKFK16T9Y
This vehicle has had intermittent PO300 random misfire for a couple weeks. Scanner shows #7 & #8 cylinders to be misfiring. Misfire can be felt occassionally for short periods. Have performed "related repair history" to try & correct this problem. Late last we... Trouble codes: P0200, P0300
2004 GMC Savana Camper Special G3500 6.0L No Start VIN: U641135031
Hello everyone this van was towed to the shop next to use for no start. will start with ether pretty sure security proble van was stolen another shop installed ignition lock cylinder. my questions are how did they get it started when it was stolen? is there a ... Trouble codes: P631
2004 GMC Sierra 3500 SLE 6.6L front diff/t-case VIN: 1GTJK33124
On my initial road test I switched back and forth between 2WD and 4WD.Only once after turning a sharp corner did it feel like it stayed in 4WD after switching back to 2WD.Drove back to the shop put truck on hoist,ran in 4WD switched back and forth from 2WD to ...
1989 Oldsmobile Delta 88 Royale 3.8L MIL Lamp on VIN: 1G3HY54COK
car came in intemmitently stalling and restarting replaced ignition module with advance parts module fixed stalling problem but ses is still on Trouble codes: 42 (esc circuit low)
1990 Oldsmobile Delta 88 Royale 3.8L Poor Idle Quality, Surge, Stall, MIL Lamp on VIN: 1G3HN54C0L
first of, thanks in advance, I know your busy. Ok, this olds came to us several weeks ago on the hook, it had been sitting for a long time and didn't start. We replaced the battery and it would start but hardly ran above idle. We found a plugged cat, along wit... Trouble codes: 21 (tps circuit voltage low), 22 (tps circuit voltage high)
1999 Oldsmobile Alero GL 3.4L 1-2 shift VIN: 1G3NL1ZXC3
4T45E trans with a long mushy 1-2 shift. Solus shows 1.15 second shift times with trans at 138 degrees F, 1/2 to 3/4 throttle. No slip and grab, just mushes into second. shift times less when trans cold and increse as trans gets warmer. No other problems. I do...
1995 Pontiac Firebird Formula 5.7L Cuts out, Stall VIN: 2G2FV22P8S
this one is killing me, it cuts out after about 20 miles and will stall coming to a stop, it cranks over a couple of times then will restart. the last time it happened the ac wouldnt engage until after driving a few miles. all data on the scan toolshows ok im ...
1997 Pontiac Trans Sport 3.4L prnd321
Hi Guys, This 97 Montana that I am working on has a problem with the PRND321 not illuminating.I have Bat.+ v. at the cluster ( pink wire K ).Performed ground voltage drops between bat- and transmission, chassis and body . All .4V or less. With the ign. key BET...
2001 Pontiac Sunfire SE 2.2L Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G2JB12401
this vehicle has been to my shop a few times. each time it leaves we think we have it whipped. we have also changed a b wire at the alternator. when the problem occurs it has trouble restarting and runs bad. the next morning it will run fine. ??? the code p030... Trouble codes: P0300
2001 Pontiac Grand Am SE 2.4L Starting VIN: 1G2NE52T51
This vehicle was towed in no start the customer told me when it came in that 2 days before he encountered the no start while driving the security light was flashing but it stopped flashing and the car continued to start until yesterday. I checked the computer ...
1999 Saturn SL2 1.9L Hesitation VIN: 1G8ZK5277X
the car has a slight bog off idle and during steady cruise cond acts similar to an accelerator pump problem on a carburated car no codes checked tps volts voltage increased correctly but tp angle did not.replaced tps,no change very repeatable will happen on ra... Trouble codes: P1599 (stall or near stall)

Fixes & Summaries for GM
Fix/Summary Answers
1997 Cadillac Seville STS 4.6L no oil pressure VIN: 1G6KY5297V
Thank you all who replied. Some of the replies were within an hour and helped to keep us thinking on a possible cause for the loss of oil pressure. We did reassemble the engine without replacing the oil pump and upon start up it did run with proper oil pressur...
1991 Chevrolet Lumina 3.1L Hesitation, LOW POWER VIN: 2G1WN51T2M
I regret I have not been able to fix this car as of yet. The customer is reluctant to spend any more on this problem. I want to thank all the techs who took time to reply to my help request. I did replace the prom (there were 3 updates although none for this p...
1993 Chevrolet K1500 Suburban 5.7L Excessive Emissions, High fuel pressure VIN: 1GNFK16K69
I really had a tough time deciding whether I should close this post with a 'Fix' or with a 'Summary.' Part of the problem is fixed and part isn't. I started a discussion on the high fuel pressure problem over on the TDF (...
1996 Chevrolet Express 2500 5.0L Hesitation, Surge, Stall, Misfire, MIL Lamp on VIN: 1GCFG25W3T
I did find the ground that i was looking for,it was at the back of the head. the reason i was looking for it was because the van had multiple codes in it all leading me to a ground problem. then as im starting to dig into the wire harness it started to run rea...
1996 Chevrolet Lumina LS 3.1L Battery VIN: 2G1WN52M4T
i would like to thank all of you that has helped me. i will give you an update as to what i have done so far. some of you has told me to check the oil sending unit, that it might be oil soaked and will cause the fuel pump to run. oil sending unit is ok. some o...
1997 Chevrolet Tahoe 5.7L No Start, Cuts out VIN: 3GNEK18R6V
Hi Again, The vehicle was finished for a few weeks now. Firstly the problem was the fuel pump, we don't have a GM dealership here and seeing that it was the holidays the couriers that i used were closed. I bought a carter fuel pump #74167 from the parts store ...
1999 Chevrolet Lumina 3.1L Cuts out, no WOT VIN: 2G1WL52M9X
the problem was that when the tech that installed new fuel pump in vehicle kinked the pressure line when he installed. correct pressure incorrect volume. thanks all for your suggestions.
2001 Chevrolet Silverado 1500 4.8L Hesitation, Misfire, MIL Lamp on VIN: 2GCEC19V61
thank you all for the information, seems like after i shared the missfire correlation everybody seemed to know what was happenning, took the truck to the exhaust shop replaced b 1 cat. all is well power returned to normal. this was an interesting vehicle. agai... Trouble codes: P0300 (multiple missfire).
1993 GMC K1500 Sierra 5.7L Rev/Drive engagement VIN: 1GTEK14K6P
Well everyone was right. Wrong pump! Replaced with non PWM pump and all is good. Sorry, stupid mistake. I appreciate all the replies. Thank you
2001 GMC Sierra 1500 SL 4.8L steering VIN: 1GTEK14V21
Hello to all and thanks to all who replied to this post, Kevin,Patrick,Amin,Bud,Anthony,Alfred,Darren,William,Christ opher,David,John,George,Gerry,Kevin,Tom,and Chad. all your replies were helpfull. I tried locating the sensor on the colum, with no luck, maybe...
2003 Hummer H2 6.0L Misfire, MIL Lamp on VIN: 5GRGN23U93
replaced cat after testing back pressure at forward o2 sensor truck runs good now also tested back pressure on left bank and found less than 1 psi thank sfor everyones help mark Trouble codes: P0300.
1997 Oldsmobile Aurora 4.0L trunk release VIN: 1G3GR62C5V
Thank you to those who replied I found a wire corroded and broken at the fuel door release fuse which is located in a fuse box under the rear seat. Repaired the wire and all is fine now.
2001 Saturn L200 2.2L oil leak VIN: 1G8JU52F31
thanks too all that replied. special thanks to brian from wisconsin &ross from ontario.vehicle returned today to recheck.found oil leking again (back of head) and noticed hairline crack in rear of cyl. head just below valvecover.boy was i fooled.all along thou...
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