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Prev Professional Automotive Repair Technical Discussions for February 21, 2007
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Open Help Requests for GM
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1994 Buick Roadmaster 5.7L Misfire VIN: 1G4BR82P8R
Vehicle has misfire on light acceleration & slight loss of power. Misfire can felt as well as heard as a puff in exhaust on light accel in gear.
1998 Buick Skylark Custom 3.1L passlock VIN: 1G4NJ52M3W
Vehicle was towed in from another shop with Theft system problem. Pull codes p1629,run diagnosis only to be referred to Antitheft and Alarm Systems. Only have Mastertech available, so checked under Body control and get wrong selection or ecu not present messag...
2000 Buick LeSabre Custom 3.8L Electronic VIN: 1G4HP54K8Y
Blower works int. Remove control assy. reinstall fan comes on. remove dash to remove harness no problem found. Don't understand system.
1998 Cadillac Catera 3.0L timing belt VIN: W06VR52R0W
hi guys,this is one for a gm man.We use al-data which is not specfic about what timing marks to use. The left [driver side]pullies have two marks about an inch apart. Which ones are used?thanks for any help.
1995 Chevrolet Monte Carlo Z34 3.4L MIL Lamp on, MIL LAMP ON & OFF VIN: 2G1WX12X7S
engine light is on & off intermittantly, there is not a specific pattern. we retrieved code # 1640. we ran through tests for this code & all is ok. cust did originally complain of oil light on dash all the time, which we traced & replaced low oil level sensor.... Trouble codes: P1640 (quad driver a failure)
1995 Chevrolet Blazer 4.3L No Start VIN: 1GNCS18W3S
Truck came in with severe no start when it is really cold. Further study revealed that regardless of temperature if gas pedal is depressed all the way when cranking ignition it will not start. If pedal is released it will start after about 4-5 seconds of crank...
1996 Chevrolet Blazer 4.3L No Start VIN: 1GNDT13W3T
Now were getting a P1351 code after running the flow chart we found that the ac voltage on the I.C. wire is 5.5 volts, it should be 1-4 volts ac, flow chart says to reflash, did that still no start, flow chart says replace VCM (ecu) did that, still no start. I... Trouble codes: P1351 (I.C. Circuit high voltage)
1998 Chevrolet Cavalier Z24 2.4L Cooling Systems VIN: 1G1JF12T2W
Car overheats,new oem thermostat,vacuum the coolant system to refill,by-passed the heater core still over heated,radiator remaims cold,coolant air bleed tube is open,bench tested thermostat and it does open as spec.radiator will flow water,not restricted.Do we...
1998 Chevrolet C3500 Cheyenne 7.4L Collapsed fuel tank VIN: 1GBKC34JXW
This is a one ton dump truck that receives much abuse. Two months ago the truck came in with multiple problems; plugged exhaust, clogged injectors, bad O2 sensors, along with a collapsed side fuel tank. The sides of the tank crushed the pump module and I could...
1999 Chevrolet Silverado 1500 5.3L Transfer Case VIN: 1GCEK19T4X
Hi, This Truck has electronic 4x4 with auto 4 WD, 2 HI, 4 HI, 4 LO. When Auto 4WD is selected the 4x4 will engage on demand and the rear wheels will climb out of the dyno.(The system works as designed). When 4 HI is selected it sounds like the transfer case is...
1999 Chevrolet Cavalier 2.2L abs light,others VIN: 1G1JC1242X
I have a car that came in with abs light on and code 1246, non-actuating rear expansion spring brake(ESB). Under trouble shooter it says this code will set if abs voltage low and sure enough on the data screen we have 2.4 volts. On further investigation find t...
2000 Chevrolet C2500 7.4L All up-shifts. VIN: 1GCHK33J57
All upshifts are extremely harsh. Has code P0122 for low TPS voltage. Also customer has complained of slippage. This transmission was just overhauled and the symptoms are the same as before. Thank you.
2000 Chevrolet Impala 3.8L body control module VIN: 2G1WF55E1Y
Hi GM Techs, I replaced the BCM on this vehicle today. I have a Tech 2 scan tool and I entered the Vin # into the BCM. I tried doing the passlock relearn manually with the 3, 10 minute intervals but the security light never went out and vehicle won't crank. Lo...
2000 Chevrolet K2500 6.5L No Start, Stall VIN: 1GTGK29F8Y
Hi don't know if I have two problems or the same that just developed into a larger problem. Customer brought this truck in twice for no start due to theft deterent system. Both times I went though and found no problems. Told customer we should order passlock s... Trouble codes: P1626 (Theft deterrent passlock problem), U1192 (theft deterrent)
2002 Chevrolet Cavalier LS Sport 2.2L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G1JH52F72
This Ecotech DOHC 2.2 lopes at idle and sets a random misfire code PO300.Misfire data shows all cylinders missing at idle.Short term fuel trim is fluctuating around 0 at idle.Long term trim is around -8.If you crack the throttle a little the car runs good.Cust... Trouble codes: P0300
2003 Chevrolet S10 2.2L oil pressure VIN: 1GCCS14H03
this s-10 came in & oil pressure droping down no lifter noise or any rattling at all. installed manual oil pressure gauge & pressure after warm drops to about 3-4 psi. replaced oil pump no change. does this mean a bad bearing? with out tearing motor apart how ...
1997 GMC K2500 Sierra SL 6.5L Poor Idle Quality, NO POWER VIN: 1GTGK24F2V
A 97 GMC K2500 6.5 turbo diesel code F came to our shop for a no-start. We narrowed it down to a faulty injection pump. Upon removal we found that the three nuts that hold the pump in place were not there. We had the pump rebuilt. The truck is now back togethe... Trouble codes: P216
1999 GMC Savana 3500 5.7L turn signals VIN: 1GDJG31R0X
Got a good one. Van come in with no parking lights. Using turn signal caused all four corners to flash fast. Turn hazards on, all four flash normal speed. Fuel gage oscillates like it's going nuts (rapid movement with little travel) Anytime we hit the turn sig...
2000 GMC Jimmy SLE 4.3L Fuel Gauge VIN: 1GKDT13WOY
This one came into the shop with the fuel gauge inoperative and the low fuel light on. We didnt really test it and installed a new pump/sender and had the same problem. Well now we have to back up and do what we should have done the first time. We have 5 volts...
2000 Oldsmobile Intrigue GL 3.5L abs module VIN: 1G3WS52HXY
hey guys, the problem with this failure started intermittantly. the problem is now full time. abs, brake, trac off, pcs, and service vehicle soon indicators illuminated. pull codes from ebtcm, and only one is present-co55o- ecu/ccu malfunction. my information ...
1999 Pontiac Grand Am GT 3.4L Poor Idle Quality, Surge, Poor Fuel Economy VIN: 1G2NW52E3X
First off this vehicle has had a hard life. The intake gaskets were blown and the engine was severely overheated. We performed a complete engine rebuild. Customer has put 4,000 miles on engine after rebuild. Customer states car has bad gas mileage, doesn't kno...
2002 Pontiac Grand Prix GTP 3.8L Accessories VIN: 1G2WR121X2
Looking for info on the Heads UP Display. Customer states it dims out completely then comes back on. I have never seen it happen while in my shop. I did replace the dimmer switch for the display but he says no change. Anybody seen anything like this? Looking f...
1996 Saturn SL2 1.9L No Start VIN: 1G8ZJ5279T
Hello, I HAVE THIS Saturn here that after you drive it for a minute it will not restart until you wait for a half an hour. I did find the fuel pressure at 95 psi. WOW. It does not flood out. When you relieve the pressure it will start right up. The car seems t...

Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick Skylark Custom 2.3L Cuts out, Stall VIN: 1G3WT7H3PH
hi what a produtive day in turned out to be thanks to all who answered! armed with emails i went into work today and tried kenny solomans (his was the first one i got so i went in order) email about the coil case and cracking took off the aluminum cover an... Trouble codes: 19 (7x intermitten signal).
1995 Cadillac DeVille 4.9L abs VIN: 1G6KD52B9S
Thank you all for responding so quickly. I went trough the wiring again and again and kept coming up with all the same readings. I liked the response to verify voltage reference at the sensor compared to other sensor because that is when I found a wire coming ...
1989 Chevrolet Corsica 2.8L Surge, Stall VIN: 2GCECK670I
Well thanks to Vincent,Lewis,Jeff,Randy,Donald,David,Marc, and Russ for all your help in getting some of the rust off the old brain here. But James hit it on the head. Performed idle relearn procedure. Started engine and let idle in gear until cooling fans cam...
1995 Chevrolet Lumina 3.1L MIL Lamp on, runs hot VIN: 2G1WL52M1S
I found the electric part of the A/C clutch was drawing to may Amps,causing the Eng.EMS fuse to go open. Replaced A/C clutch assembly. Trouble codes: 0028 (Transmission Range Switch), 0037 (TCC Brake switch circuit), 0075 (egr 1), 0076 (egr 2), 0077 (egr 3).
1997 Chevrolet Cavalier Z24 2.4L daytime running lamps VIN: 1G1JF12T3V
thank you for all the responses. i never ran across this problem so i didn't know where to look. the wiring behind the washer resevoir was rotted just like everyone said. i really appreciate all the help
1998 Chevrolet K2500 Cheyenne 5.7L output shaft bearing VIN: 1GCGK29R9W
Well It's out. It had a snap ring like a fwd cv axle does. It was jamed up some how . only a little bit survived.I ended up pulling the front diff and taking it to a tranny shop to remove it.sometimes you need to give up before tear something up. had too buy t...
2001 Chevrolet Monte Carlo SS 3.8L MIL Lamp on, Start/stall VIN: 2G1WX15K31
Thanks for the help. Dale and others where right it was a restricted converter. Converter caused back pressure to push EGR open all the time, heat caused hole to burn above tube, 'opposite' EGR inlet tube. Had no coolant leaks and car runs fine with New intake... Trouble codes: 300 (miss fire), 1811 (trans), 404 (egr).
2002 Chevrolet Venture LS 3.4L transfer case VIN: 1GNDV03E82
Thank you to everyone that replied. We decided to pull engine and transmission together. Jerry
2003 Chevrolet Silverado 1500 5.3L Blower motor
Fixed the beast. Got 12 nearly instant replies and EVERY one was dead on the money. Harold, Jarrod, Chet, Brett, Bull, Chad, Randy, Rolando, Anthony, Brent, Neil, and Justin had all seen this problem before and it was indeed the blower control module that was ...
2004 Chevrolet Tahoe LS 4.8L speedometer VIN: 1GNEK13VX4
1996 GMC Yukon SLE 5.7L Starting VIN: 1GKEK13R4T
well as 75% of you said it was the dist. cap issue I didn't think to look as it had a complete tuneup about 9 months ago incl. cap, rotor, wires & plugs but the vent was plugged up, so we replaced with factory cap & rotor and replaced pcv valve as per napa's t...
2003 Hummer H2 6.0L Misfire, MIL Lamp on VIN: 5GRGN23U24
This Hummer is fixed. However, it required the reflashing of the PCM by the dealer. We tried every suggestion we were given from checking for a vacuum leak with smoke machine (none found, internal or external), a possible plugged catalytic converter ( backpres... Trouble codes: P0300 (Multiple misfire).
2005 Hummer H2 6.0L ignition switch/key VIN: 5GRGN23VX5
Two people replied with questions about add on electronics such as auto start or alarm systems. There is no add on in this case. We did find a loose wiring harness on transmission that when corrected allowed proper shifting and when codes were cleared, all was...
1997 Oldsmobile Bravada 4.3L front axles VIN: 1GHDT13WOV
i did talk with customer, and he told me in the past,when the front tires were very worn it made the same noise, so he replaced them with new ones, and the noise went away. recently he replace the two rear tires that were just a bit bigger in diameter because ...
2000 Oldsmobile Intrigue GX 3.5L temp gauge VIN: 1G3WH52H0Y
sorry this took so long but most of you said that I still had a air pocket even after all the things I had done to try and get rid of it. I was also told that I needed to use a vacufil unit to fill this system. I finally got my hands on one and I think so far ...
1996 Pontiac Grand Am SE 2.4L MIL Lamp on VIN: 1G2NE12T1T
Well that's the reason I come here. Ron and Jay were completely correct. I felt like a shade tree-er pulling the battery cable, but that's what it took to fix the car. This particular car would not completely clear the EVAP code with the scan tool. Even though... Trouble codes: P0440.
1998 Pontiac Sunfire SE 2.2L battery lamp VIN: 1G2JB5248W
Thanks to all for your replies!I,ll keep your replies on file and let you guys know what I find when car returns to shop.Car is still running with battery lamp on,no dead battery yet.I found out this lady is busy working and days off are few,go figure!thanks e...
2000 Pontiac Montana 3.4L Front suspension VIN: 1GMDX03E5Y
Thanks to all who took time to answer. After questioning the customer some more, it was learned that they had recently had an aftermarket hub/bearing assy installed under an extended warranty plan. When told how much it was going to cost to fix the problem usi...
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