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Prev Professional Automotive Repair Technical Discussions for April 21, 2011
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Open Help Requests for GM
Help Request Answers
1994 Buick Century Custom 3.1L Hesitation, Low Power VIN: 1G4AG55MXR
This Buick suffers low power when accelerating when the engine is warm, seems OK cold. I watch the Knock Sensor counts and they will slowly increase and the ignition timing is retarding, sometimes by up to 23*. If I run it at about 2500 rpm in Neutral or Park ...
1997 Buick LeSabre Custom 3.8L abs VIN: 1G4HR52K9V
Help please. When accelerating from a stop the traction control will activate. Most often it happens on a turn (right or left). The only thing I have found is the right rear sensor is slow to start counting (all other wheels are at 2 and sometimes 3 mph when r...
2006 Buick LaCrosse CX 3.8L Flexplate VIN: 2G4WC58266
Hello team. Vehicle pulled in driveup area with Knocking noise. After noise diagnostics, we discovered a cracked flexplate. We replaced with OE Flexplate inspected dowel pins and bolts. We reassembled and the test drive was good. Until! One month later car ret...
1994 Cadillac Seville SLS 4.6L No Start, Poor Idle Quality, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G6KS52Y3R
Hi Guys. This caddy is a mess. Hope some of you have seen parts of this before. Car came from another shop after engine/trans replacement. They could not get it to start. I began with fuel pressure test, o.k. 40 psi. Then went to spark test, no spark. Test sho... Trouble codes: 80 (Rich or tps learn)
1998 Cadillac DeVille 4.6L Stall VIN: 1G6KD54Y3W
PLEASE READ ALL TEST DATA AND POST BEFORE REPLY. Car came in 2 weeks ago on hook with a no start condition. Found bad ignition relay. Replaced with dealer relay. Noticed fuel gauge not working properly and car quit running. Found ground wire for fp and signal ... Trouble codes: P1599
1989 Chevrolet S10 Blazer 4.3L Excessive Emissions, MIL Lamp on VIN: 1GNCS1829K
This cute little trucklet failed CA Emissions test for high NOx (2977 ppm @ 15 mph-1786 @ 25) EGR not opening. If i apply vac directly to EGR truck stalls like it should.I have power and ground to solenoid,and if i ground signal wire,it passes vac & stalls.con... Trouble codes: 32 (Egr malfunction)
1998 Chevrolet Cavalier 2.2L Transmission VIN: 1G1JC5249W
After driving an hour vehicle gets hot, make a right or left turn, transmission will flare and it may do it 2 or 3 times consecutively or it may do it once, then it will catch and take off. It does not do it on every turn. Only gotten it to fail 3 or 4 times. ...
1999 Chevrolet K2500 7.4L manual 1st and 2nd VIN: 1GCHK33J1X
Helping a transmission rebuilder with this 99 chevy pickup. i believe its a 4L80E trans. Trans has just been overhauled, but had same problem before build. When in manual 1st gear its in second gear and when in manual 2nd gear its in 3rd. When in drive there...
2001 Chevrolet Tahoe 5.3L Mechanical VIN: 1GNEK13T51
Hi, I got this Tahoe in with a noise complaint. The noise sounds just like a belt lightly chirping. The problem is it ONLY does it under a load. I can do it in the shop by power braking it a bit, but cannot pinpoint where it is coming from. It seems to be loud...
2004 Chevrolet Silverado 2500 HD 6.0L Misfire VIN: 1GCHK29U24
Hi guys. I have a 2004 Chevy Silverado 2500HD. Has misfires on all cylinders. Customer replaced plugs and wires with new sets, hoping to cure the problem. We have done a crank relearn, which did not help. We replaced the crankshaft sensor, still no change. We ... Trouble codes: P0300 (Engine misfire detected), P0420 (Cat. System low efficiency bank 1), P0446 (Evap emissions vent system performance)
2005 Chevrolet Suburban 1500 LT 5.3L MIL Lamp on VIN: 3GNEC16Z25
Customer complaint , reduced power on message center , truck wouldnt go over 55mph , occured several times.When monitoring data stream app 1 and 2 agree. Cleaned the throttle body , checked wiring , seems good.Not real familiar with these things , did fix a di... Trouble codes: P1125 (APP TP sensor)
2006 Chevrolet Silverado 1500 LT 5.3L Misfire, MIL Lamp on VIN: 1GCEK19B66
This is a ? not a help request. Vehicle came in with celo and misfire codes set. Truck had oe plugs and wires, so the first thing we do is install new plugs and wires clear codes and test drive. Seemed good. Next morning cust calls light back on, he brought it... Trouble codes: P0300
1997 GMC Jimmy SLE 4.3L Misfire VIN: 1GKDT13W9V
I have a 97 jimmy 4.3L. came in with o2 code and misfire codes. We did a total tuneup.Ran well it came back running bad replaced o2 fuel pressure was 76 psi running 50 off.we replaced the fuel pressure regulater and now the fuel pressure is at 80 psi.It stays ... Trouble codes: P0300
2000 GMC Sierra 1500 SL 5.3L Differential VIN: 2GTEK19TXY
Customer came in about a month ago with a bad clicking noise coming from the rear diff. Upon removal of the cover I found that a couple teeth had broken off the govenor cam gear (the one on the side that drives the govenor). So I replaced the toothed gear and ...
2004 GMC Yukon XL 1500 SLT 5.3L 2-3 Shift VIN: 3GKEC16T24
The customer came in stating that the vehicle would not shift from 2nd to 3rd. No prior shift problems before this. Customer did have a Trans. Service done at a fast lube, which makes me wonder if there WAS a problem prior, Not many people service their tranny...
1995 Oldsmobile Achieva S 2.3L Mechanical VIN: 1G3WS52K4W
we have a 95 olds achiva sc that has the 2.3dohc engine that is blown, now to my understanding this is the only year they came out with this engine. a used replacement engines are starting around $900 and going up. my question is if anybody has or knows if the...

Fixes & Summaries for GM
Fix/Summary Answers
1999 Cadillac DeVille 4.6L engine VIN: 1G6KD544XX
Another no fix but did diagnose close.As most if not all responses were for a leaking head gasket,you were all right.After extensive running[45 minutes] setting on a hoist,the engine air locked and I was able to get exhaust gases from the cooling system.Custom...
2003 Cadillac CTS 3.2L Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1G6DM57N23
This vehicle has left the shop. The timing belt was not ever the issue as most of you suggested, it was replace because of age. The only reason I mentioned it in the first place is because I knew that is what most of you would think of in the first place. The ...
2000 GMC Yukon XL 1500 SLE 5.3L Abs VIN: 3GKFK16T5Y
Thank you for all the input. The right side sensor must have been an aftermarket with shims. I cleaned the right side, there was a lot of grease on the reluctor which on this truck is on the axle. On test drive all symptoms gone. If customer comes back I wi...
2003 GMC Savana 3500 6.0L all electrical VIN: 1GDJG31U74
thanks for all the help. I did find corrosion at some connecters by the under hood fuse box cleaned all terminals and grounds. reconnected everything and all is working fine now. So it was all just bad connections. thanks again mike
2004 GMC Sierra 2500 HD 6.6L Oil pressure gauge VIN: 1GTHK23274
Seems like not everyone reads thru the whole Help Request Post. I already had the instument cluster repaired ($295) and oil pressure sensor tested good, no need to replace it. What I did find is a broken signal wire (tan/wht) just below intake manifold in fro...
1993 Oldsmobile 88 Royale LS 3.8L Battery VIN: 1G3HY53L3P
The customer needed their car back sooner then expected. The two weeks that we had it, it did not act up once. We checked everything that we could think of. Car never returned, but if it does I will post a "Fix". Thank you all for helping!!
2002 Saturn Vue 3.0L wrench lite VIN: 56ZCZ63B62
thanks to all that replied it is a non emo lite it was like the one guy said had a tail lite out all is good thank again
2003 Saturn Ion-1 2.2L No Start VIN: 1G8AG52FX3
Thanks to all for all the suggestions. I finally send the car for a reflash and everything got back to normal. I still dont understand why I couldn't do it but what can I do. Thanks again.
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