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Professional Automotive Repair Technical Discussions for May 10, 2007 International Automotive Technicians' Network (iATN) - Members Only |
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Open Help Requests for GM
| Help Request | Answers | |
| 2000 Buick Regal LS 3.8L Excessive Emissions, Surge, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 2G4WB55K7Y Vehicle was brought in with MIL light on and poor fuel economy. Vehicle was also running poorly and had a strong fuel smell. Checked vehicle and found the #3 injector to be leaking. Replaced injector and vehicle ran fine. Test drove at different times over nex... Trouble codes: P0203 (injector circuit malfunction - cylinder 3) |
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| 1987 Cadillac Eldorado 4.1L Blower Motor VIN: 1G6EL1181H Car came in with no blower operation and Low A/C refrigerant flashing on the display. I have fixed the a/c and cleared the code for low refrigerant, but still no blower operation. It did kick on once for about 3 seconds after the a/c work was done and has not ... |
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| 1999 Cadillac Catera 3.0L Surge VIN: W06VR52R3X tested relay and fuse, jumped relay works fine. disconnected vacumm solenoid, verified vacumm and air flow. Jumped relay again and verified air flow to engine by 02 stats. snap-on mt2500 no ability to activate from scanner. Intermittently hear sec AIR motor ru... Trouble codes: P0411, P0300, P0301, P0303, P0305 |
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| 1991 Chevrolet C1500 Cheyenne 5.7L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, MIL Lamp on VIN: 2GCEC19K3M this truck came in running rough and had a mil light on. i discovered that the map had been unplugged (electrically) and went to reconnect it. when reconnected the truck shuts off. further inspection revealed a severely worn cap and rotor as well as a broken i... Trouble codes: 12 (ecm check normal code), 34 (Low or no map output while engine is running) |
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| 1999 Chevrolet Express 3500 5.7L Hesitation, Surge, harsh/no shift VIN: 1GCHG35R3X Scan normal except for VSS. Seemed like classic bad sensor. Replaced sensor - no change. Truck is almost undrivable. ECM doesn't know what to do with 88-150mph at idle. Will go normal for a second when the engine shifts (rolls). Acts like a chaffed or cut harn... |
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| 2003 Chevrolet Trailblazer North Face 4.2L body VIN: 1GNET16S13 truck came in vib at 40+ in whole truck did balance & rotate adj. air pressure to spec still had vib. replace 4 tires now am being told that vib is from 70-80 going away at 80. has any one heard of drive tran problem in this veh. |
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| 2003 Chevrolet Impala 3.4L compressor VIN: 2G1WF52E13 Help G.M. techs.Compressor will not engage,pressures are fine.Body computer recognizes a/c switch signal,but the data parameter in the PCM data for a/c request says no.I can command compressor on with scan tool.The pressure signal voltage value on the scan too... |
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| 2004 Chevrolet Impala 3.4L Hesitation, Misfire, Poor Fuel Economy VIN: 2G1WF52E84 Customer says the engine misfires sometimes for a second when the vehicle is cruising approx 60 mph. I was able to verify the symptom. I drove the vehicle for approx 5 miles and it ran great. No misfire showed on the scan tool data except twice where a few cyl... Trouble codes: P0300 (Random/multiple misfire detected.) |
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| 1994 Geo Prizm 1.6L Excessive Emissions, fails NOX VIN: 1Y1SK5362R The vehicle failed NOX . I have checked ignition timing, tps idle contact, timing belt indexing, crank gear, and the harmonic balancer keyway for wear. I replaced the catalytic converter. The o2 is working, stays between .4 and .5 volts and goes up and down wi... |
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| 1995 GMC C1500 Sierra SL 4.3L NO Spark, Fuel VIN: 1GCEC14Z9S Its my own truck and I jump started another vehicle to bring it in the shop, I am pretty sure my engine was not running and after I started this other vehicle then I started my Truck and parked it in its place and after that it never started for me again. Ther... |
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| 2000 Oldsmobile Bravada 4.3L Alarm VIN: 1GHDT13W2Y The alarm system will go off in the middle of the night for no reason. At first I didn't believe the customer untill I drove it home. He claimed that around 2:00am the alarm starts sounding. Me and my nieghbors all verified this condition. It will turn off wit... |
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| 2001 Oldsmobile Intrigue GL 3.5L MIL Lamp on VIN: 1G3456AWE4 Came in for 410 code failed IM test. Replaced both Sec. Air Pump valves as they were bad. After repairs car passed but came back with SES light on 410. Doesnt always fail. fuel trims go high and 02 goes low when activated by Tech 2. Indicates good flow.Freeze ... |
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| 1998 Pontiac Grand Am GT 3.1L warning light VIN: 1G2NW52M1W We have this Grand Am in here with a wierd problem. While driving under 50 mph everything seems ok. Once you hit 50 mph the ABS and ETS lights come on. No codes. All tone rings are ok. All speed sensors read the same when going straight. Any help??? Thanks ahe... |
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| 1999 Saturn SL2 1.9L steering wheel cabin area VIN: 1G8ZK5274X This saturn exhibits a vibration from 45 MPH upwards on seemingly most road conditions. Customer says it varys from slight to a very noticable shake in the front end area. it shakes the steering wheel and most of the car. Shifting to Neutral and braking seem t... |
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| 2002 Saturn L200 2.2L Wipers VIN: 1G8JU54F32 This Saturn's wipers will operate without the switch being turned on. We've replaced the switch and the relay with no results. Having looked at the wiring diagram available for this, I can't see where voltage would be able to get to the wiper motor without the... |
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Fixes & Summaries for GM
| Fix/Summary | Answers | |
| 2001 Buick Century Custom 3.1L unsure VIN: 2G4WS52J16 Thanks for all the replies. the vehicle left with un-confirmed diagnosis (no more money to put into fixing). The replies covered possible bad or damaged cam bearings or camshaft (via use of scuffing disc cleaning methoed),possible scuffed piston/piston slap, n... |
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| 2002 Buick LeSabre Custom 3.8L Misfire VIN: 1G4HP54K92 Thanks to everyone who has replied to this post. Upon further inspection after the cylinder heads were removed we found that the #1 exhaust cam lobe and lifter were both damaged severely. We are suggesting engine replacement. You would think that this would ha... Trouble codes: P0300, P0301. |
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| 1994 Cadillac DeVille 4.9L Hesitation, Surge VIN: 1G6KD52B1R THANKS TO ALL WHO RESPONDED,THE CAR IS FIXED AND MY NEW CUSTOMER IS VERY PLEASED. EVEN THOUGH I DID CLEAN ALL THE OBVIOUS CADILLAC GROUNDS AFTER FURTHER STUDY OF THE WIRING DIAGRAMS I FOUND THEY MOVED ALL THE PCM GROUNDS IN 1994. THE MAIN PCM AND SENSOR GROUND... |
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| 1972 Chevrolet El Camino 5.7L Fuel Gauge VIN: 1C80J2L521 Well this one is fixed. Thanks for all the replies. It turns out improper testing of the ceramic resistor is what hung me up. You have to remove it from the back of the gauge to check it or you check resistance if the gauge itself (DUH!) . Replaced resistor wi... |
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| 1981 Chevrolet C10 Custom 4.1L lifters VIN: 2GCEC14D6B I knew I needed to put a manual gauge on it before continuing & was looking for a pattern failure. The oil pressure started @ 35 p.s.i. & dropped to 30 hot, lifters clacking. I rigged a clear 1/2' dia. hose @ oil sender port, routing it back to a funnel in val... |
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| 1988 Chevrolet S10 2.5L Poor Idle Quality, Cuts out, Stall VIN: 1GCBS14E4J Ok here's where I stand right now I have checked fuel pressure, fuel volume, coolant temp sensor, replaced throttle body gasket and nothing has changed. One thing I have found is that the truck runs good cold with the vacuum line off the map and plugged I chec... |
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| 1992 Chevrolet C1500 Cheyenne 5.7L Excessive Emissions VIN: 1GCDC14K0N Hi, guys thanks for the help. Our emissions here are strict and the aftermarket cats don't work on some vehicles. I had to put a second cat in line and replace the EGR. The back pressure valve in it was stuck and allowing to much egr. Now the comp is not remov... |
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| 1994 Chevrolet G20 Chevy Van 4.3L Poor Idle Quality VIN: 1GBEG25Z3R Thanks to all who responded, We deciced to reseal throttle body with a seal rebuild kit, (new Fuel pressure regulator diaphram injector seals and gaskets, reinstalled TB and of course it was hard to start because of system lost prime, but the next morning it d... |
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| 1994 Chevrolet Corvette 5.7L shifter VIN: 1G1YY22P0R Apparently we left out a very minute allen screw in the reverse lock out release. Thanks to Glen [...] for responding. Karen |
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| 1997 Chevrolet Cavalier 2.2L Misfire, MIL Lamp on VIN: 1G1JC5243V didn't really get much help on this one ...found that it was losing ignition a from pcm to ign module so had another pcm reflashed and am trying itr for next week or so to see if that fixes it Trouble codes: P0300. |
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| 2002 Chevrolet Impala LS 3.8L Surge VIN: 2G1WH55K12 FIXED!!! Don from Indiana nailed it, did not find the table for pressures in all data, but we had an identicle vehicle to test the pressures against, it was just like he said all to high comparatively! Gm makes a reman valve body part,[...] $228.25 through ... |
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| 1998 GMC Sonoma SLE 2.2L Misfire VIN: 1GTCS1945W We put an O2 sensor in it and still did not fix it I drove it while my boss watched the scanner and couldnt really come up with anything brought back into shop and scoped TPS with my vantage and found a very small glitch in the signal. Replaced the TPS problem... |
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| 2001 GMC Sonoma SL 2.2L Poor Idle Quality, Surge, MIL Lamp on VIN: 1GTCS14591 Bad TPS sensor. We had replaced the TPS and used an aftermarket TPS and the problem persisted but in a different manner. Once I recognized that I tried a dealer TPS and problem solved. Thank you all. Trouble codes: P0122. |
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| 2001 GMC Savana 3500 5.7L MIL Lamp on VIN: 1GDHG31R81 thanks for the help , but most of you stated things that had already been check as per message, anyway the fix ended up being the crank position sensor, the new aftermarket was shorter than the dealer sensor and was not picking up the signal right. as i stated... Trouble codes: P0300 (missfire detected). |
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| 2002 GMC Sierra 1500 SL 4.8L antifreeze VIN: 1GTEC14VX2 This 02 gmc truck that had a burnt smell of coolant in the cab turned out to be a very small hole in the heater core just leaking enough that there was no leak in the heater box I think the core was hot enough to evaporate the coolant , replaced heater core an... |
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| 2005 GMC Canyon Z71 SLE 3.5L rear brakes VIN: 1GTDT13685 Upon the various recommendations I checked and replaced the rear u-joint. 1 bearing cap was seized. The vibration went away and vehicle drove great. Thanks again. |
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| 2002 Pontiac Firebird 3.8L engine REPLACE ALL PUSHRODS TWO WEEKS AND CAR RUNING GREAT THANKS ALL OF YOU GUYS END THANKS iATN TECHS YOU DE BEST |
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| 2003 Saturn Vue 3.0L dash lights electric steering VIN: 5GZCZ63B83 thanks to all who replied !!! the problem was in the bcm tried a salvage bcm and fixed some problems but created more than fixed had to buy new from dealer and have dealer flashed but all ok. |
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