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Prev Professional Automotive Repair Technical Discussions for April 15, 2010
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Open Help Requests for GM
Help Request Answers
1994 Buick LeSabre Custom 3.8L No Start VIN: 1G4HP52L8R
the customer changed the ckp and the icm started once then stalled. towed to me and i checked the timing chain its ok.did checks in my verus and came up with bad ckp sensor so i changed itand found that the one they put in was cracked . still no start,long sto...
2000 Buick LeSabre Custom 3.8L Fuel Guage VIN: 1G4HP54K8Y
Customer complaint was fuel gauge reads full most of the time. Gauge is now reading over a quarter of a tank. Modis scan tool reads this as 39 percent. Unplugging the harness, makes the gas gauge go to full, for about a minute, then it drops back to empty. Sca...
2005 Buick Terraza CXL 3.5L Steering VIN: 5GADV33L75
Hey guys ive got a 05 buick terraza that has no power steering at idle and is hard to steer with rpm sitting in the shop. I have changed the pump twice both with dealer pumps and blead them according to a tsb. After all that still the same so we decided to put...
2004 Cadillac SRX 3.6L timing chains VIN: 1GYEE63724
Hey all GM guys, I have a caddy that has a fairly loud whine comming from the front of the engine. It gets louder and higher pitched with higher RPM. I did remove both belts and run the engine and the noise is still there. I removed the front cover and chains ...
1995 Chevrolet K1500 Silverado 5.0L left front VIN: 1GCEK19H6S
Hello everyone, this is my truck and driving me crazy. At a slow speed[20 mph] with light brake pressure there is a rotational clunk-clunk sound on the left front. I have had the rotors turned, same. I rotated the rotors l to r ,always lf. r &r hub assembly wi...
1995 Chevrolet Astro 4.3L Poor Idle Quality, Surge, Cuts out, Stall VIN: 1GKDM19W3S
This Van starts and runs fine for about 10 minutes, then it cuts out, runs, cuts out again does this then finally dies, it's barely driveable when it's doing this.. Restarts fine but the problem starts again after about 5 seconds. If you let is sit for a few m...
1997 Chevrolet K2500 5.7L No Start VIN: 1GCGK29R6V
I first posted on this three years ago and I'm still trying to figure it out(in my spare time). I'm including the text of the previous post below this so I'll be short. I have removed the upper intake and hooked up the injector assembly. All injectors work wi...
1999 Chevrolet Cavalier 2.2L instrument cluster VIN: 1G1JC1244X
Have this cavalier that had no low beam headlamps only left high beam and no drl. inspected front haness for lights and found prior repairs, cut wire and lots or electrical tape. also found corosion at harness connector. found a used harness in salvage yard, r...
1999 Chevrolet Silverado 1500 LT 5.3L Intermittant whirrin VIN: 2GCEC19T5X
This a well-maintained truck. There is a VERY intermittant noise (sometime a whirring, sometime a hissing) noise coming from under the back of the cab. The noise does not change with engine speed or vehicle speed. It will appear randomly and with the noise, th...
2001 Chevrolet c7500 8.1L backfire VIN: 1GBM7H1E21
At a steady cruise 55 M.PH. decelerate and Kaboom, sometimes 2 or 3 times out of the exhaust , but not as loud as the first backfire, I would think the muffler should be gone as loud as it backfires. We normally don't work on these trucks , but since it had th... Trouble codes: P0522, P1633
2001 Chevrolet Silverado 2500 HD 8.1L Hesitation, Cuts out VIN: 1GCKE29G31
I have this 2001 Chevy 2500 HD with the 8.1 L Gas engine that is giving us problems! When COLD first start for the day it runs bad on accel. It only last a few seconds and once it takes off it will be fine for the rest of the day. The fuel pressure is picture ...
2002 Chevrolet Express 2500 5.7L No Start, Poor Fuel Economy VIN: 1GCGG25R52
had this van back in the shop a few times for the same issue and every thing turns to a bad fuel pump butt after three fuel pumps a wiring harness and sum relays im stumped
2003 Chevrolet Impala 3.4L starter VIN: 2G1WF52E43
Customer just purchased this 03 impala, stated that engine will not crank if when you turn ignition key and stop in accessory position before proceding to start position engine will not crank to start, if you twist key straight to start it works normally, if y...
2003 Chevrolet Trailblazer LT 4.2L Drive-axles VIN: 1GNDT13S53
I am working on this vehicle at home, I work at a Fleet Garage where we are not permitted to work on non-company vehicles. I do not have a lift at my disposal, so it has been in and out of my garage on jackstands every night this week. My supervisor's boss bro...
1997 Geo Metro 1.0L No Start VIN: 2C1MR2263V
Hello all, Once again I have another problem child. 97 Metro 1.0L Car will run good for about 1 minute then looses injector pulse only. we replaced all tune up items, new fuel pump & filter due to low fuel pressure, now we have good fuel pressure. when you cra...
2001 GMC Yukon XL 1500 SLT 5.3L Front Driveline VIN: 3GKEK16T71
This transfer case had no codes in history or current. It had markings where in the past some had been into it. I have had this unit apart 4 times now and can't see and or find what is causing the clutches for the front drive line to stay partially enguaged wh...
2002 GMC Yukon Denali 6.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GKFK66U92
what i noticed though is only when the car is idling at 560 rpm it starts to mis and as soon as you step on the gas a little the mis disappears and the idle goes to 6xx rpm, and stays there for about a solid min or so, then back down to 560 and the mis retuns.... Trouble codes: P0300 (Multiple random misfire)
2005 GMC Sierra 2500 HD SLT 6.6L Hesitation, Surge, Cuts out VIN: 1GTHK232XF
Hello iATN! This Duramax was brought to me as a referral by another really good customer. He states that he had excessive water in the fuel system and that is where the problems started. Customer took the liberty of cleaning fuel system, new fuel filter, insta... Trouble codes: P1093 (Fuel Rail Pressure Low During Power Enrich), P1094 (Fuel Rail Pressuer Low During Idle or Decel Fuel Cut-Off)
2005 GMC Sierra 2500 HD SLT 6.6L No power VIN: 1GTJK33255
For all you duramax gurus out there! vehicle came in with cel on ..customer complaint of lacks power wont accel over 2000 rpm. Has code 1093 for fuel rail psi. I realize that the code is causing the lack of power by default. the problem is intermittent though ... Trouble codes: P1093 (Fuel rail psi low during power enrichment)
2003 Hummer H2 6.0L Temp Gauge VIN: 5GRGN23U13
This hummer has a temp gauge that reads way too high. Was reading approx 275, yet engine is at normal temp, normal pressure & coolant level. Scan tool shows ect temp ok at 195. Mitchell on demand & idenfix both show in electrical component locater a temp switc...
1996 Oldsmobile Achieva SC 2.4L Hesitation, Surge, Misfire, Poor Fuel Economy VIN: 1G3NL12T9T
This thing is just not right. We have an o2 sensor reading of constantly 4 millivolts and once in a while it will jump up to about 225 millivots. O2 reading one inch from computer is about 800 to 850 becouse it is demanding fuel. Tried a new o2 sensor and got ...
2001 Saturn L300 3.0L MIL Lamp on VIN: 1G8JN52R31
car has the codes listed below.communication with scanner comes and goes.powers at dlc are ok.also instrument cluster operation is erratic,such as fuel guge moves around a lot.tachometer work intermittently.sometimes the scanner will communicate with ecm but n... Trouble codes: B0296, U0100, U2105
2003 Saturn LW300 3.0L Steering Rack ? VIN: 1G8JW84R93
Car came in for front brakes, 4 tires and alignment. After all repairs the power steering now turns easy to the right and hard to the left. With steering wheel straight, engine off, start engine and steering wheel turns slightly to the right by itself. It also...

Fixes & Summaries for GM
Fix/Summary Answers
1996 Cadillac DeVille Concours 4.6L Charging VIN: 1G6KF5290T
Ended up the fix was a broken wire.Thanks Tom from Ontario,ended up we were testing the wrong wire.The IPC controls the charging not the PCM.Thanks again
1998 Cadillac DeVille 4.6L hard start cold VIN: 1G6KE54Y1W
Thanks everyone for your help. I have talked to the customer again and with the weather getting warmer, the hard start hasn't been an issue. It sounds to me like my next step would be to check fuel volume and fuel quality. I will keep everyone in the loop when...
1997 Chevrolet C3500 7.4L No Start VIN: 1GDCHK33J2
Ok techs as you know we replaced the fuel pump the relay the oil sending switch the crank sensor. we asked the customer he said he replaced the the ignition with a used ignition so we checked the voltage coming out of the ignition at the fuel pump fuse and had...
2005 Chevrolet Classic 2.2L timing chains VIN: 1G1ND52F65
this one is fixed. many suggested replacing timing chains, etc. that was not the problem. i first tried to get the rest of the oil filter fragments out of the engine by removing the fornt cover. then i removed the tensioners and the oil jet. then i flushed sho...
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