GM Automotive Technicians Technical Discussion and Fixes for May 21, 2012 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	2006 Cadillac DTS 4.6L battery VIN: 1G6KD57Y86 Vehicle has intermittent parasitic draw.One time vehicle driven and draw goes to .035 mA. Next time vehicle driven comes back parked for 20 mins and has .700mA draw. next time .300mA draw.I have narrowed draw down to rear fuse panel under rear seat. Draw is al...	View
	1995 Chevrolet S10 4.3L No Start VIN: 1GCCS14ZXS Thank you in advance for any help u can provide. I have this s10 pu that keeps shorting out ign control modules, i have installed four distributors, three reman and one new. It will run fine for two days and then no fire or inj pulse. I have checked all ground...	View
	2000 Chevrolet Suburban 1500 LT 5.3L Excessive Emissions, Misfire VIN: 3GNFK16T6Y OK Gentlemen I need your help this month we had a lot of vehicles come in this month for troubleshooting problems, we fix all of them until this one came in. It failed smog at other shop for high emissions, and a check engine light on. The light also flashes ... Trouble codes: P0300, P0153, P0154	View
	2001 Chevrolet Corvette 5.7L speedometer VIN: 1G1YY22G21 I would like to thank all who reply in advance... I have a vehicle here which has had the speedometer recalibrated for larger wheels. The customer has reinstalled the factory wheels on this vehicle. Now... I need to recalibrate the speedometer back to factory...	View
	2004 Chevrolet Trailblazer LS 4.2L Stall VIN: 1GNDT13SX4 Vehicle arrived with a complaint of dying or stalling. There was a code in the system P0410 set. This is the secondary pump system. I initially erased the code and it has not come back on yet. Still runs erratic. Trying to get the vehicle to reset codes but un...	View
	2005 Chevrolet Express 3500 6.0L Turn Signals VIN: 1GCHG35U45 Hi Guys, This van has a problem with the turn signals flashing way too rapidly but all are working. The 4-ways flash normally. We changed the flasher module but with the same result. Checked bulbs and am not finding anything unusual. The 4-way switch is an ind...	View
	2006 Chevrolet Silverado 1500 LT 5.3L 4x4 VIN: 2GCEK13T36 Im not familiar with gmc nor 4x4 systems very well. This truck was just poned on to me from my boss and now i have to try to fix it.4x4 is inop and i got code c0321 with snap on scanner.its got 4 buttons as follows:auto,2wd,4lo,&4hi if i remember correctly. Wh...	View
	2007 Chevrolet Impala LT 3.5L cooling VIN: 2G1WT58K37 I want to ask how many have seen something like this before. This post may represent two separate issues but herte goes. About a month ago the customer brough his car in for his engine "runs hot", as he relayed the information to us. We retrieved DTC P0128 tha...	View
	1994 Geo Tracker 1.6L Excessive Emissions VIN: 2CNBE1862R HI there everyone and HELP. I have this 1994 Tracker with CA emissions that has high Nox, oxides of nitrogen. At both speeds they are approximately 1200. The CO is very low, like zeros across the board. We found the exhaust manifold cracked on two runners badl...	View
	2006 GMC Sierra 1500 SLE 5.3L No Start VIN: 2GTEC19Z96 This truck came in from another shop with the right head off. They had found a bad lifter and cam lobe.They didnt want to do the job so I took it on.I pulled the engine and changed the parts.The truck would not start (had spark,noid,fuel pressure and no codes)... Trouble codes: P0342, P0343	View
	1992 Oldsmobile Custom Cruiser 5.7L Cust states a/c comp stops intermittantly. VIN: 1G3BP8376N This Olds is from another shop that gave up. The customer states the air conditioning will 'shut off' randomly when running, but can't remember when specifically or how often. It has not happened in the service bays yet after 15 minutes of idling and 2000 rpm ...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1996 Buick Riviera 3.8L Poor Idle Quality, Misfire, MIL Lamp on, No power VIN: 1G4GD2212T Thank you to all who responded, your inputs were very insightful. I hooked up guage to exhaust, at 1500 rpm it was at 1.5 psi, at 3500 rpm's the pressure guage jumped to 5psi under load & down the road. Extreme back pressure. I have notified the customer but a... Trouble codes: P0300 (Cylinder misfire detected), P0171 (Bank 1 lean), P0174.	20
	1997 Chevrolet K1500 Suburban LS 5.7L MIL Lamp on VIN: 1GNFK16R0V thanks for all the ideas,turning the distributor gear one half turn got timing within [...],slight gringing hold down got me to zero.all is well know,i will certainly try that right away whenever i have trouble with a reman timing problem. Trouble codes: P1345.	34
	1999 Chevrolet Lumina LTZ 3.8L misfire VIN: 2G1WN52K3X thank u all 4 the help after i use my scope in the injectors and the maf wich was bad i also found a bad icm and bad coil thank u all so much codes are gone costumer happy	26
	2001 Chevrolet Corvette Z06 5.7L Poor Idle Quality, Misfire VIN: 1G1YY12S81 Thanks to everyone for all the help. Just to clear up, i had already done the crank relearn before i posted-just forgot to put that in there. I changed out the injector with another new one and all is well. I guess even AC Delco lets some bad parts get by some... Trouble codes: P0300 (random misfire).	13

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