GM Automotive Technicians Technical Discussion and Fixes for Apr 6, 2006

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Open Help Requests for GM

	Help Request	Answers
	1989 Cadillac DeVille 4.5L power stays on VIN: 1G6CD5157K Hi all, The problem with this car is a dead battery in a very short time I found that with the key turned off and out of the ignition The charge light stays on The fuel data light is on and at 0 mpg The fuel gauge flashes E (it has a full tank of gas) The clim...	View
	1994 Cadillac DeVille Concours 4.6L dash cluster VIN: 1G6KF52YOR the owner said that someone stole the radio. after that the dash lighting stopped working. i have checked all of the fuses and they were ok. we pulled the dash unit and checked all power and grounds at the connectors and they show battery voltage on power circ...	View
	1998 Cadillac Seville SLS 4.6L ride control - code C1711 VIN: 1G6KS54Y0W code C1711 ,service ride control ,speed limit 90mph	View
	1992 Chevrolet Corvette 5.7L headlight doors VIN: 1G1YY23P9N I am pretty stumped , headlight doors bounce, the left headlight door bounces when headlights are turned off and the right headlight door bounces when the headlights are turned on. If I turn the park lights on and off both actuators turn back and forth(not cau...	View
	1993 Chevrolet S10 4.3L Cuts out, BACKFIRES VIN: 1GCCT14ZXP truck came in with backfire/cutting out on accel. cust. said just started. he replaced fuel filter & egr valve. i test drove and verified complaint. seemed like fuel starvation. tested fuel pump current with vantage, pattern not real good compared to known goo...	View
	1993 Chevrolet Lumina 3.1L MIL Lamp on VIN: 2G1WL54TXP Hi there maybe someone can help with this one. I have a 93 Lumina that is going crazy the scanner shows all kinds -40 for coolant temp the speedo shows 80 tps stays at 2.5 volts but if you check it at the sensor it is normal. The trans only shifts one time but...	View
	1995 Chevrolet Blazer 4.3L Master cylinder VIN: 1GNDT13W5S I am working on a 95 [...] w/ 4 Wheel Abs and it is 4wd. Has front disc rear drum. I cannot seem to eliminate a soft pedal/pedal fade on this vehicle any suggestions for bleeding will be appreciated or tips on what else other than the master cylinder will ...	View
	1998 Chevrolet Cavalier 2.2L instrument cluster VIN: 1G1JC5247W this cavalier at start up will intermittently leave warning lights lit after start up, sometimes one or two and it has left all of them on a couple of times, there are no codes when these lights are on . the oil light and battery light abs low track and ets of...	View
	1999 Chevrolet Monte Carlo LS 3.1L surge VIN: 2G1WW12M6X please help, i found many post on this very same problem but many different complaints. i have the surge between 55 and 70 cruising on the highway light acceleration especially going up small hills. i believe it's lean. pings. here's what we have done. 2 motor...	View
	1999 Chevrolet Blazer 4.3L blower speeds VIN: 1GNDT13W7X automatic system came in with no blower at all. tech two wont communicate. module supplies ground, if jumped blower runs, tried good module from good car.need good info. i have not been able to find a correct wiring diagram or flow chart for this blower circui...	View
	1999 Chevrolet K1500 Suburban 5.7L lack of power VIN: 3GNFK16RXG this sububan acts like its running out of fuel. on the highway the o2 sensors go lean to 9 to 24 milli volts. going about 75 mph tps show 100 percent injector pulse width on the scanner show 11.5 ms, air flow meter shows 89 grams per second map sensor show 3.4... Trouble codes: P0131, P0137, P0151, P0157	View
	1999 Chevrolet S10 2.2L Hesitation, lack of power VIN: 1GCCS144X8 hello friends ...I have this gem on my hands. about six months ago this vehicle came to my shop for having no power.I quickly found exhaust plugged. So i replaced the kitty and recomended a tune up. After replaced the plugs and wires,fuel filter.I sent it on i...	View
	2000 Chevrolet Silverado 2500 6.0L reverse VIN: 1GCGK24U4Y vehicle has no reverse doesnt seem to slip but does not move in reverse i think i know problem is mechanical but wanted second opinion.Hooked scanner to truck did find it does show its in reverse.Any help would be helpful	View
	2000 Chevrolet Blazer LS 4.3L air flow VIN: 1GNCT18W9Y I removed the sound panels and watched and put my hand on each of the vacuum motors in this system. All four moved through full range when commanded. I was able to disconnect the heat slave valve actuator and moved the door manually. I could see the recirc doo...	View
	2000 Chevrolet Venture 3.4L Rev. and drive engagement VIN: 1GNDX03E1Y Hello guys. This van is my own personal vehicle, I have not ever been able to duplicate the problem. But it seems to do it frequently for my wife. She say's that when she shifts into reverse or drive at times that nothings there, she puts it back into park tri...	View
	2000 Chevrolet C3500 5.7L fuel gauge VIN: 1GBJK34R1Y If I unhook wire form computer to dash the gauge will go to full. If I unhook the wire from the balance module to the computer it stays on empty. When you first start the truck the fuel gauge starts to go up ( the tanks are full)to just about half and then dro...	View
	2002 Chevrolet Avalanche 1500 5.3L Drive train VIN: 3GNEK13T02 Hello , I have a Avalanche with some vibration problems. In auto 4x4 or locked in 4x4 this truck will vibrate. You have to be going at 80 - 100 kms with a little ecceleration. once it starts you can keep it going. It feels like the front end is hopping. The on...	View
	2002 Chevrolet Impala 3.4L No Start VIN: 2G1WF55E72 This vehicle was brought into the shop with a dead battery. I replace the alternator and battery. Four days later the battery was stone dead again after siting for about 24 hours. Alternator test at 100 amps, after a full charge the battery passed a load test ...	View
	1995 GMC G2500 Vandura 5.7L Surge, Cuts out VIN: 1GDEG25K0S customer brought vehicle in to get ready for summer trips it never had a tune up he complained that he had a lack of power. after installing tune componets and a lengthy road test. code 44 was present we checked for vacuume leaks none found egr valve was found... Trouble codes: 44 (lean exhaust)	View
	2000 GMC Yukon Denali 5.7L mastercylinder VIN: 1GKEK13ROY sometime the brake pedal goes to the floor.Chevrolet dealer said it a bad brake booster.625.57. i thought when brake booster goes bad,u get a hard brake pedal	View
	1999 Oldsmobile Alero GL 3.4L No Start VIN: 1G3NL52E1X gm techs help please,this 99 olds came in on the hook. it starts and runs 4 sec.the security light work and does not flash during the 4 sec.it has fuel pressure and spark it appears to kill injector pulse(like vtd problem.there is no communication with any of ...	View
	2001 Oldsmobile Alero GLS 3.4L Cuts out VIN: 1G3NF52E41 This vehicle runs perfect until you hit 3800 RPM, then it cuts out. When it cuts out it detonates really bad. I reprogrammed the PCM. No tech bulletins. No codes are set. I cannot find anything wrong with. Here are some scan tool readings during the cut out pe...	View
	1993 Pontiac Grand Prix SE 3.1L Poor Idle Quality, Hesitation, Cuts out, Stall VIN: 1G2WJ11T1P hi guys this vehicle came in for engine stall hesitation,idle flair up. we scanned and found codes were multiple ,try to clear codes they came right back.we have also no rpm,-40 on the coolant.tipical ecm right ,not, we changed it and we still have the same pr...	View
	1997 Pontiac Sunfire SE 2.2L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on, PO300 VIN: 1G2JB1246V vehicle came in for bad running and lights on dash(check engine.low coolant,abs)found bad sensor in coolant bottle,blown fuse for abs light.ign wires were crossed car runs good when cold,upon warm up engine starts to stutter and miss,vehicle also has had head ... Trouble codes: 300 (random misfire)	View
	1997 Pontiac Sunfire SE 2.2L Poor Idle Quality, Surge, Misfire, MIL Lamp on VIN: 1G2JB1242V hey guys i got this sunfire here and can't go any futher with the tool i have. my lab scope only goes to 95. i used gerneric mode on secondary ignition wires and the two cylinders 2 & 4 misfire the most out of the four they have a waveform that the lab scope s... Trouble codes: P0300	View
	1998 Pontiac Grand Am GT 2.4L rack?? VIN: 1G2NW12T2W This car has an intermitant bind to the left only.The first time I notice it I was backing up turning left.Struts ,ball joints and tie rods move freely not under load .I'm wondering about the pump but why left only. Anybody else run into one of these before???	View
	1998 Pontiac Sunfire SE 2.2L MIL Lamp on VIN: 3G2JB5249W Intermittant code P0404. EGR position out of range. About once per month. Always checks out good at shop. Removed EGR to check and everything looked good. No carbon and not sticking. We have a couple of these with the same problem. Any thoughts? Trouble codes: P0404 (EGR position out of range)	View
	2000 Pontiac Sunfire SE 2.2L key cylinder assy VIN: 1G2JB12474 Gentlemen The owners called and said their starter was bad could they have it towed to my garage ( acted the same way before and replacing the starter corrected the problem ). To verify the problem before replacing the starter I tested for current at the sole...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1972 Buick Skylark 350CID wiring harness VIN: 4D37H2H195 hanks to all who took time to dig up these old diagrams.I was able to figure out which wires were supposed to be hooked to what based on color codes,also got vacumn lines routed correctly.Thanks to John,Dean [...],Donnie $ anyone else I may have overlooked.Jim	5
	1996 Buick LeSabre Custom 3.8L front end VIN: 1G4HP52K2T Well I wish I could have been the one to fix this thing, after posting my original help request my customer had taken the car home and stated they would return. but once I read all the help requests and decided to try the options supplied my customer decided t...	18
	1998 Buick Park Avenue 3.8L cruise control VIN: 1G4CW52K3W Cruise control fixed. Thanks for the help. Kevin and Ray put me in right direction. Checked wires at servo unit again. Tugged on all wires, sure enough one wire was broken inside. Repaired and cruise work great. Must pull on wires when car accelerates	4
	2000 Buick Regal GS 3.8L Hesitation, Cuts out, Misfire VIN: 2G4WF5517Y I did check everything that was mentioned form all the replies that i recieved and i decided to pull the injector rail and recheck injector flow and i decided to look at the back side of the valves and on number 6 and 4 there was some carbon build up and on th...	16
	1965 Chevrolet Corvette 327CID Fuel Gauge VIN: 194675S127 First thanks to all who responded. The system operation was as I describe earlier. However, I spoke about no power to the system. I finally tracked down the grounded wire to the dash that was supposed to be power. It was the ignition switch that should have be...	6
	1993 Chevrolet Astro CL 4.3L Poor Idle Quality, Surge VIN: 1GNDM19WXP thanx for all of the help, on the astro i found the pick up coil bad in the distributer. I came across the problem do to another problem astro van that came into the shop that another tech just happened to stumble across.	11
	1994 Chevrolet Corvette 5.7L Fuel lines VIN: 1G1YY22P4R Thank you to those who replied.Customer declined to have repairs done due to estimated cost of repairs.	4
	1999 Chevrolet C6500 7.4L tank runs dry VIN: 1GBJ7H1BXX I have pulled my hair out on this one, customer is very patient, and has learned when to pull over & refill the left tank before running out of fuel. I have had both senders out and move them thru thier ranges & watch the fuel gauge and it seems to show a corr...	4
	1999 Chevrolet Tahoe LS 5.7L Rear differential VIN: 1GNEK13R6X The problem was the yoke at the back of the tranfer [...] was dry. I guarantee you I would have spent half a day finding this one but thanks to all of you it was fixed in 30 minutes. I discussed the new yoke with the customer so if or when the problem comes bac...	29
	1999 Chevrolet Blazer 4.3L 4x4 VIN: 1GNCT18W2X Thank you for all the repies. The corrosion on the terminals of the TCCM was a give away. I replaced the TCCM with a used unit and all is well once again. IATN is a great resource Terry	3
	2004 Chevrolet Epica LS 2.5L No Start Turns out the BCM has it's own seperate fuse in the BCM! Replaced the 5amp fuse and all is well. The reason we had no communication to the ECM was our scanner, Can't go in as generic OBDII and Epica in not listed? Entered veh as a Subaru and could now communic...	3
	1996 Geo Metro 1.3L No Start VIN: 2CIM5292T6 thanks for the 6 replies, especially from jerry [...], he advised us that he had found the lifters to be very hard to bleed and also carbon under valves occasionally, so WE tried to clean and bleed the lifters again to no avail. we also applied air to the cy...	6
	1991 Pontiac Bonneville LE 3.8L Poor Idle Quality VIN: 1G2HX54CXM I do appreciate the help that you all have given me. I had rechecked everthing many times, and yesterday I let it run for 30 minutes without a problem. When I got in to test drive it the check engine light was on. Low TPS voltage, 0.00 vts. I had checked that ...	13
	2002 Pontiac Grand Am SE 3.4L radio VIN: 1G2NE52T6T Thanks to all who responded. Just about everybody agreed that installing the ignition switch could not cause damage to the radio. the customer was offered a 50% discount towards the repair as a goodwill gesture and as yet has not responded.	10

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