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Prev Professional Automotive Repair Technical Discussions for November 18, 2014
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Open Help Requests for GM
Help Request Answers
2003 Buick LeSabre Limited 3.8L Unknown VIN: 1G4HR54K63
Has shudder at 1000-1500 rpms in 4th and 3rd gear under mild acceleration. Feels like possible misfire. Replaced plugs and ignition wires as they were O.E. did not fix. Replaced all coils and ignition module did not fix. Found TSB on TPS replaced it did not fi...
2004 Buick Rendezvous CX 3.4L po300 mifire VIN: 3G5DA03E04
my cusutomer brought it in for check engine light no driveability concerns. po300 code stored. when drivin or off idle it doesnt show any misifres when at idle every few minutes it will miss heavy for about 30 seconds on #5 and a few randoms on the other cylin...
1996 Chevrolet C1500 5.0L Cuts out, Stall, Hard Start VIN: 1GCEC14M6T
Working on a worn out 1996 C1500. Hard start almost always, runs for 10-15 seconds, stalls. When it does run longer, it cuts out with quick throttle input and backfires. It starts easier on carb clean. Fuel pump was leaking back pressure, so we replaced it a... Trouble codes: P0135 (O2 Sensor Heater Circuit Bank 1 Sensor 1), P0154 (O2 Low Activity B2S1)
1997 Chevrolet K3500 5.7L No Start, Hard start VIN: 1GBHK33R1V
Vehicle came in with a long crank/hard start cold. put fuel pressure gauge on first thing in the morning and pressure was good. did drop to about 5o psi when first cranking.its not weather related. truck has starting problem regaurdless of temp. cam retard was... Trouble codes: P0154 (B2/s1 no activity), P0131 (B1/s1 low voltage), P0140 (B1/s2 no activity), P0151 (B2/s1 low voltage)
1998 Chevrolet Express 3500 LS 5.7L No Comm. to scantool VIN: 1GBJG31R6W
98 Chevy Box Truck will not start, no communication to scan tool and check engine light gets no bulb check, no spark or fuel, repaired conn. to VCM and replaced comp., however dealer can not program, disconnected Brake mod. but did not restore Comm to scan too...
2004 Chevrolet Suburban 1500 LS 5.3L guages VIN: 1GNFK16T94
original complaint = dash acting up, shift indicater slow. found loose battery terminal. clean and tighten .check battery little weak ,charged and tested ok. overnight dead. charge again test for draw ,n.p.f. install new battery now ok. road test,hit large bum...
2006 Chevrolet Cobalt LS 2.2L Poor Idle Quality VIN: 1G1AK15F56
thanks in advance guys this colbalt has me stumped it came in for low cat efficancy code checked back pressure 1.5 psi ay 2500 rpm downstream o2 about 550mv scanner data not changed o2 mv lower sent customer home next day shes back code back freeze frame said ... Trouble codes: P0420
2005 GMC Yukon XL 1500 SLT 5.3L Airbag
Internal short in BCM was blowing fuse for dome lights and reverse lights. I replaced the BCM and programmed it using flasher pro and laptop thru Acdelco techconnect SPS. The BCM programmed like normal but I couldn't program the anti theft module with my lapto... Trouble codes: B1001 (Airbag signal configuration)
2007 GMC Sierra 3500 HD SLE 6.6L MIL Lamp on, reduced power VIN: 1GTJK33647
Need advice from diesel guys as I don't do very much other than mait. on diesel. Truck goes into reduced power mode, says exhaust filter needs cleaning. Wont do forced regen due to P02E7 re-setting immediately once vehicle is in motion. My question is where is... Trouble codes: P02E7
2006 Hummer H3 3.5L Surge, Misfire, MIL Lamp on VIN: 5GTDN13696
Replaced coils and plugs on customer request, still has multiple misfires on all cylinders. Seems to be more apparent when cold, still misfires but not as bad after warming up. Misfires are high on cylinder 4 with cylinders 1 and 5 not as high, misfires on 2 a... Trouble codes: P0300

Fixes & Summaries for GM
Fix/Summary Answers
2001 Cadillac DeVille DTS 4.6L Ride Control VIN: 1G6KF57971
the customer told me he heard the pump running before I couldn't get it to run more then about three seconds he told me to put the 919.29 a piece shocks on the car he would pay so I did it the compressor came on for like three seconds and I got into the back o...
1997 GMC K3500 Sierra SL 6.5L block VIN: 1GDJK34F3V
well thank goodness for Hal [...]!! you saved me hours of pointless labor. this had an upper radiator hose leaking from the bottom of hose where it attaches to thermostat housing. coolant ran down the valley to a drain hole between engine ...
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