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Prev Professional Automotive Repair Technical Discussions for July 30, 2007
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Open Help Requests for GM
Help Request Answers
1999 Buick Regal LS 3.8L Misfire VIN: 2G4WB52K4X
This buick is now in for the second time for a poor run condition, it sets a p0300 missfire code and the customer complains of a lack of power. this is the only code set and i have not experinced the complaint. however in the p0300 freeze frame data i noticed ... Trouble codes: P0300
2000 Buick Regal GS 3.8L Cuts out, Stall VIN: 2G4WF5512Y
I have this 2000 buick that will start and run for a few seconds then quit, if you hook up a alternative fuel supply it will stay running I thought it may be the security system,but there are no codes and every thing on my scaner are telling me that it is ok, ...
2003 Buick Rendezvous CX 3.4L MIL Lamp on, ALL WARNING LIGHTS VIN: 3G5DB03E53
Hi all, I have a good one here. 1st off, there are alot more codes in this that i did not mention, all of them are "U"codes dealing with loss of communication between all modules, so i did not feel the need to include them. When this thing acts up, the "anti-l... Trouble codes: P1626 (theft deterent fuel enable signal lost), U1096 (lost comm. with ipc), U1300 (class 2 data link low...shorted to gnd)
1997 Cadillac Catera 3.0L Engine VIN: W06VR52RGV
The vehicle came in for an overheating problem. After diagnosing a oil cooler problem that turned the cooling system to sludge, we took off the heads and found that the oil/coolant problem affected the cylinder head gaskets. We replaced the head gaskets and pu...
1997 Cadillac DeVille Concours 4.6L MIL Lamp on, High idle VIN: 1G6KF5496V
Hi guys, I have one here that is leading me to the PCM, but wanted to ask you all first. This car comes in with a SES, and customer complains of a high idle. I never had it have a high idle for me and the test proceedures all tested out good. So the customer h... Trouble codes: P0122, P1122
1998 Cadillac Catera 3.0L traction control lamp VIN: W06UR52R5W
thanks in advance for everyones help with this one. vehicle came in with abs lamp, tc lamp and speedometer would quit. diagnosed as ebcm as all inputs were good to module and had no communication. now abs lamp is off, speedo works but tc lamp is always on and ...
2001 Cadillac Seville SLS 4.6L Steering Column VIN: 1G6KS54Y51
A customer has brought there car in for rack and pinion replacement but I cannot lock the steering wheel when the key is removed so I can remove it from the intermediate shaft. This is important becuase of the coil in the column. The rack and pinion has been b...
2003 Cadillac Seville STS 4.6L Misfire, MIL Lamp on VIN: 1G6KY54913
Computer Scan, Miss #5 cyl., compression test was good. Fuel pressure was good. Swapped spark plugs to other cylinders, swapped spark plug boots to other cylinders. Tested & lab scoped fuel injectors, swapped fuel injectors to other cylinders, checked with noi... Trouble codes: P0300 (Random Miss), P0305
1988 Chevrolet C1500 Cheyenne 4.3L ABS CODE 9 or 10 VIN: 1GCDC14189
Hello everyone and thanks for the help on this one. I have this 88 plain jane pickup in with the red brake light on the dash flashing constantly. My assumption is that it is flashing an RWAL code. Alldata says you should have to jumper the ALDL to get RWAL cod...
1992 Chevrolet C1500 Cheyenne 5.7L cylinder heads
I am relacing head gaskets and I was using my old torque wrench so I borrowed a friends and have foun I overtorqued a head by 15 lbs it t is torqued to 80 and should be 65 what do i do to fix this problem???
1995 Chevrolet K2500 Cheyenne 7.4L Evapotator VIN: 1GCGK29N4S
A.C.evaporator ices over with blower motor on low speed at idle-set blower speed to second speed and evaporator thaws.Also ices over after extended drive.Have cleaned out debris from evaporator and condensor(dust,dirt,etc.).A.C.pressures are normal and compres...
1997 Chevrolet malibu 3.1L fuel guage
the lady bought this car from the lot she drove it home brought it back a couple days later to repair a flat tire and she mentioned nher gas guage wasnt working.I personally in my short 21 years in auto service have never seen what hers is doing. It we...
1992 Geo Metro 1.0L shifter VIN: 2C1MS24609
this transmission and another car identical to this one(same customer oddly enough)is very difficult to shift. it is not in the shifter or the linkage but inside the transmission, i wonder if there is a bushing or something that i need to replace. info in alld...
1996 GMC K1500 Sierra SL 5.7L No Start VIN: 1GTEK194TE
this truck will crank but no spark after a hot soak. it seems to have good fuel pressure 58-65, which drops a little when this cranks no start happens,50 psi. my spark seems to occur less frequently. i ran a crank sensor frequency test. 50hz at idle. i am usin...
1999 GMC K3500 Sierra SLE 6.5L Surge, Cuts out, Stall VIN: 1GTHK39F9X
Ok GM diesel guys I seriously need your help on this one, as it's my own truck. I've been racking my head over this for the last couple weeks with no good results, it all started a few weeks back with what appeared to be a bad fuel filter but after changing it... Trouble codes: P1216 (Solenoid closure time too short)
2001 GMC Safari SLE 4.3L service AWD light VIN: 1GKEL19W31
Hi Customer just purchased. Service AWD light is on steady. No codes. Any ideas for an approach would be appreciated.
1991 Oldsmobile 98 Regency Elite 3.8L Poor Idle Quality, Hesitation, Cuts out, Misfire VIN: 1G3CW53L1M
car brought in for intermittent hesitation/rough idle. customer left car 3 days ago. no codes stored. duplicated rough idle only twice. customer thinks it's possibly bad gas. fuel pressure reads 40psi even when rough idle occurs. car does not have map sensor. ...
1992 Oldsmobile Silhouette 3.1L No Start VIN: 1GHDU06D4N
This is my neighbor's car. His wife was driving it on the hwy and it lurched twice and lost power. He had it towed to his house and found it had no spark. I looked at it and told him to get a module, which he did from NAPA. It now has a lot of spark and plenty...
1994 Oldsmobile 98 Regency 3.8L Poor Idle Quality, Very fast idle VIN: 1G3CX52L6R
Customer brought vehicle to shop, Idles at 3000 RPM Checked all vacuum hoses ect., Replaced AIS Motor, Replaced Upper intake Gaskets, Replaced TB Base gasket, Checked everywhere with Carb Spray, No change in RPM. Throttle Plate is Closed. Blocked off EGR, No C...
2000 Oldsmobile Intrigue GL 3.5L Cooling Systems VIN: 3B7KF23479
Vehicle came in with coolant leak and overheating problem. replaced weater pump which was source of coolant leak and replaced temp sensor. Vehicle still overheats. Does anyone have any direction? (ps: replaced thermo also)
1995 Pontiac Bonneville SSE 3.8L Hesitation, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G2HZ5213S
Car came in with a complaint of stalling w/o a pattern - getting on freeway and at stop signs --restarts w/o problem- could not duplicate --- customer claims 3 times a week -- Scanned had 341 Int cam signal, 321 No 18X Ign, 361 EST not toggling, 740 T/C Clutch... Trouble codes: 740 (TC Selonoid), 406 (EGR Pintle Error)
1997 Pontiac Trans Sport 3.4L MIL Lamp on VIN: 1GMDX03E7V
Hi, thanks for reading my post.Sets egr code.Egr will not function normally.Egr has been replaced. No drivability complaint. Check engine light on only. This is not a low flow error. it's pinticle position error. I have tested the egr with a Snapon Solus and a... Trouble codes: P1401, P1655
2000 Pontiac Bonneville SE 3.8L Speedo, Tach, turn signal indicators VIN: 1G2HX54K3Y
Hello all. I have a 2000 pont bonneville, customer states no Tach no speedo no turn signals. Cluster has been replaced. It has a reoccuring code "U1255-class2 dataLink Malfunction" in IPC Current codes. I am testing with a tech2, i can clear codes and it insta...

Fixes & Summaries for GM
Fix/Summary Answers
1990 Buick Regal 3.1L No Start VIN: 2G4WB14T3L
Thanks for the help guys-like most of most of you said the problem was a shorted #3 fuel injector.A new OEM fuel injector fixed the vehicle.Thanks for the insight on what we were missing. Mike
1998 Cadillac Seville SLS 4.6L Hesitation, MIL Lamp on VIN: 1G6KS54Y9W
1999 Cadillac Catera 3.0L Surge
Thank you for the three people that sent replies. This one had me stumped for awhile. I had to make a short trip last thursday so I got permission take this car from the customer. Drove 65 miles and the car ran perfectly unless I stopped and put it in park. Th...
1990 Chevrolet K2500 Cheyenne 5.7L Hesitation, Cuts out, Stall VIN: 1GCFK24K6L
thank you to all who responded.this fix was as easy as they get with everyones help.turns out that a pickup coil was the issue.thank you again for all your help
1996 Chevrolet K2500 Suburban LS 7.4L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy, MIL Lamp on VIN: 3GNGK26J5T
well first thanks to all the techs and their suggestions but what it turned out to be was the customer installed a tornado (cyclone looking) aftermarket part that is supposed to spin the air in a swirl form into the intake. i just didnt pay any attention to it... Trouble codes: P0172, P0175.
1998 Chevrolet Corvette 5.7L No Start, Stall VIN: 1G1YY32G1W
Many thanks to all who responded. Some suggested corroded grounds, ignition switch failure, passlock failure, even a possible intermittant open in the underhood fuse block. Two agreed with our assessment of a BCM failure. However, the customer decided to take ... Trouble codes: P1626 (anti-theft system fuel enable circuit), B2587 (column lock/unlock open or ground), B2723 (passkey detection circuit open or shorted), U1096 (undocumented), U1016 (undocumented).
2000 Chevrolet Suburban 1500 LT 5.3L Poor Idle Quality VIN: 3GNEC16T1Y
Thank you everyone. cleaning the throttle body made a huge difference in the idle quality. It never dropped out once. upon inspection, it did not appear to be dirty, but i guess it does'nt take much.
2001 Chevrolet Malibu 3.1L Upper Intake Manifold VIN: 1G1ND52J31
Thankyou for your suggestions and help. The upper manifold cracked for two reasons. One, I over torqued it on the original install. Two, the machined surface near the bolt hole was very narrow(almost into the threads), and the excessive torque caused the pad t...
2003 Chevrolet Silverado 1500 4.3L Airbag Light VIN: 2GCEC19X33
There is a TSB for this problem dealing with broken or pinched wires, not a problem on this one. This truck has vinyl floormats and there had been a lot of moisture on and around the module beneath the driver's seat. I tested sensor input right at module, and ...
1995 GMC Jimmy SL 4.3L Compressor VIN: 1GKDT13W5S
Many thanks for all the help. I missed something on this repair. Someone did an intake a while back. They left a bracket off. From the top mounting bolt to the intake. Got one from the bone yard and installed it. No more growl. Thanks Again, Jessey Lynn
2001 GMC Savana 2500 4.3L Misfire, MIL Lamp on VIN: 1GDGG31W21
Sorry to be so late with this, but it still isn't fixed yet. I ohmed out all the wires from the PCM to the related ignition components and all checked out fine. Many thanks for the wiring diagrams from Chris [...] which helped a great dea... Trouble codes: P0351 (Ignition coil 1 Primary/Secondary circuit).
2003 GMC Envoy XL SLE 4.2L Fan clutch VIN: 1GKES16S33
Thanks to everyone who replied to my request for help. Out of the 12, 6 said to replace the fan clutch. One suggestion was to unplug the electric connector and if the clutch stayed engaged, it was bad. That is the way ours acted. We replaced the fan clutch and...
1996 Oldsmobile 88 Royale 3.8L fuel gauge VIN: 1G3HN52KXT
hi there sorry it took so long to get back to you but the custumer just brought back the car today jul.30th i just want to thank everyone for there replies and a thank you goes to glen for helping me isolate the problem which was staring me in the face. the...
1995 Pontiac Grand Prix SE 3.1L Cuts out VIN: 1G2WJ52M2S
Thanks everyone. These were all good logical suggestions. I of course started with the easiest and foud a bad ignition coil. I realize a resistance check for these coils is not valid, but just for hoots, I rechecked tham all again and two measured at 6,000 ...
1996 Pontiac Firebird Formula 5.7L MIL Lamp on VIN: 2G2FV22P1T
Many people who answered the request for help didn't know what motor this is. There is NO distributor adjustment. The distributor is behind the water pump horizontally mounted. This is an “optispark” performance system. Corvette style. I checked the wave... Trouble codes: P0336, P0335.
1997 Pontiac Grand Prix GTP 3.8L Mechanical VIN: 1G2WP5219V
thanks to all, i sent the car to a trans shop down the street to get a second opinion, they installed a new flex plate like we did and used an aftermarket hardened bolts, the bolts that would get loose are the ones that bolt to the crank, not to the tor. conv....
2000 Saturn SL1 1.9L Poor Idle Quality VIN: 1G8ZH5284Y
Well everyone had some very good points to be said. TPS,COOLANT TEMP SENSOR and IAC circuts,connections or the part its self. I was impressed to take note about checking grounds at the bell housing. Allthough I was able to repair the vehicle so as no codes cam... Trouble codes: P0261 (injector control circut low), P1351 (ignition control cyl 1/4), P1352 (ignition control cyl 2/3).
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