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

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Open Help Requests for GM

	Help Request	Answers
	1994 Cadillac Seville STS 4.6L Misfire VIN: 1G6KY5298R customer request: time for tune up... no problems or complaints mentioned for needing tune up before bringing vehicle in shop... no problems with idle quality or performance while driving... removed covers for ignition wires along intake.. found a lot of carb...	View
	1990 Chevrolet Camaro RS 3.1L Excessive Emissions, Poor Idle Quality, Stall, Misfire, MIL Lamp on hello guys long day on this car with little results car was towed in would turn over but not start first two times i tried after i got it in the shop i could hold the key switch and it would stay running till i let go but i think it was just by chance because ... Trouble codes: 33 (map sensor high), 34 (map sensor low), 44	View
	1996 Chevrolet K1500 Cheyenne 5.0L high idle VIN: 1GCEK19MXT Customer complaint of high idle after warmed up, it does it, after warmed up, acts like it is sticking after you accelerate to above 2000rpm it will stay there untill you load the engine without throttle input then it will idle down to 759-800rpm, and be fine ...	View
	1996 Chevrolet Cavalier Z24 2.4L Poor Idle Quality, Poor Fuel Economy VIN: 3G1JF12T7T Vechile came from another shop. customer was in collision and had new computer, flashed but jobber parts also ignition was done plugs and boots coil pac and ignition module. Also customer has had 4 o2 sensors installed and vehicle still not running right. Car ...	View
	1998 Chevrolet Cavalier LS 2.4L horn VIN: 1G1JF52T4W were is the horn relay location?	View
	1999 Chevrolet C2500 5.7L Starting VIN: 1GCGC24R6X We have a Les Schwab truck with a crank no start problem at times (once a month) and codes p1626 and p1631 stored in the computer. They are asking us to disconnect the Anti Theft system so they can fix it at a later date. I have never disconnected one of these...	View
	1999 Chevrolet Silverado 1500 5.3L 4th gear VIN: 2GCEC19T4X We have a 1999 Chevy C1500 Pickup with a 5.3L V8. History: Trans was rebuilt by other trans shop 8 months ago(13000 miles ago). Came to our shop with no 2nd or 4th. Trans had a burned band, Reverse input drum surface, & burned overrun clutches. We rebuilt the...	View
	1999 Chevrolet Blazer 4.3L transfer cas VIN: 1GNDT13W1X Blazer came in with 4X4 in locked 4x4 position. service 4wd light on. has code C0232 transfer case lock circuit low. Hooked up Snap on scanner to actuator test. did some testing and hear relays by kick panel working. went to move it out of shop and its now in ...	View
	2000 Chevrolet Silverado 1500 5.3L steering rack? VIN: 1GCEK19T9Y This truck has asqueal that sounds just like abelt squeal. Replaced both belts, has a seperate ac belt, checked pulley alinement and could not feel anything wrong.A week later squeal came back, replaced belts again, with amajor brand name, still noisy, but ver...	View
	2000 Chevrolet Silverado 1500 4.3L Misfire VIN: 1GCEC14W1Y thanks everybody for your help.i got this truck that came in with an engine misfire #2cyl.miss more in idle in gear.driving the truck engine miss is less.i have replace complete dist.,ign.rotorb & dist.cap.have check spark plug,injector pulse,injector,ign.wire...	View
	2001 Chevrolet Silverado 2500 HD 8.1L convertor VIN: 1GLHK29GX1 The truck came in with no gears but rev. Could not drive. Did a pressure test and all the pressures where good. Replaced c1,c2,c3,c4 fritions and steels. c1 was bad. c2 and c3 had some hot spots on the steels. Had the convertor rebuilt, no magor damage but rep...	View
	2002 Chevrolet Astro LS 4.3L No Start VIN: 1GNEL19X12 Hi, thanks in advance for any help. This Astro was towed in with a crank no start. We have fuel pressure, injector pulse, spark, good compression, crank reference...we are at a loss, there are no codes with our OTC or our snap on scanners. We do have a flash r...	View
	2002 Chevrolet Tahoe LS 5.3L MIL Lamp on VIN: 1GNEK13ZX2 Hi everyone! We have a customer with a flex fuel vehicle that turns on the mil lamp about every couple days. in testing we noticed barometric pressure is reading low, we think in turn leaning out the vehicle??? we are having a hard time finding out what sensor...	View
	2004 Chevrolet Silverado 1500 5.3L driver information center VIN: 2GTEC19T93 Hi gang-We just replaced this IPC (rebuilt unit) and noticed that now the Driver Information Center does not function. When you first start it the message center gives odometer reading and also shows 'Driver 2' then 'Change Engine Oil' but none of the steering...	View
	2004 Chevrolet Malibu LS 3.5L Electronic power steering VIN: 1G1ZT528X4 Hello fellow techs, Have a problem with this car's electronically assisted power steering. Every once in a while, it will completely stop providing power assist. Vehicle stays running, and there are no other symptoms. If you shut the engine off, wait 30 second...	View
	1998 GMC Savana 1500 4.3L water pump VIN: 1GTFG15W4W Hello gentleman, You know when you want to ask for help but you're almost embarrassed to...Well consider me humbled. I've got the above listed vehicle that I can't keep a water pump on it with out leaking (as in pouring ) out the rt side gasket area of the wa...	View
	1999 GMC K2500 Suburban 7.4L Valve Lifters VIN: 3GKGK26JXX Hi All, 1st Off: Thanks so much for taking the time to look & possibly help.. The problem is that this truck has rocker arm /lifter noise(Bank 1).(Oil pressure to spec seem good) Took off Bank 1 valve cover to find that 2 rocker are not oiling. (5&7 Ex) Pull...	View
	1990 Oldsmobile Delta 88 Royale 3.8L Stall, MIL Lamp on VIN: 1GH3N54C6L Hi guys, This one is strange. Once its warmed up and the system is in closed loop, if you tap the brakes the engine will stumble or even die. It will also do it in open loop but just once. It does it ever time in closed loop. Can't find a vacuum leak anywhere... Trouble codes: 41 (Cam sensor)	View
	1994 Oldsmobile Cutlass Cruiser 3.1L a/c clutch VIN: 1G3AJ85M1R hello people; this car came to me with a noisey a/c clutch. i put a new clutch on and it seemed to be fine. the customer came to pick it up and said the a/c was not working. i brought the car back in our shop and after the car warms up the a/c clitch will kick...	View
	1998 Oldsmobile Silhouette Premiere 3.4L abs light-traction light- battery light on intermi VIN: 1GHDX03E7W abs light and traction light come on intermittenly battery light comes less frequently transmission will not shift correctly when lights on- traction control affects it?? battery voltage was at 18.3 volts on scanner one time test voltage at abs relay- 14.4 at ...	View
	2000 Oldsmobile Alero GL 2.4L noise VIN: 1G3NL52T7Y this alero is driving me and my tecks nuts. has a pop noise when steering wheel cut hard to left. have replaced a arm. upper strut mount left side, tighten all eng/trans mounts. i fill like a outer cv joint and/or bearing and hub is defective. any replies help...	View
	2001 Pontiac Sunfire SE 2.2L Lighting VIN: 3G2JB52431 this is a long time customer who bought this car from us. when driving at night the headlights go off then back on and sometimes stay off. flicking the dimmer switch doesnt make a difference. also when the problem is going to happen a small click (sounds like ...	View
	1999 Saturn SL1 1.9L MIL Lamp on VIN: 1G8ZH5284X Has any one run into this problem? MIL light on, sorry forgot the code EGR insufficent flow. I know on the Honda product the EGR ports get plugged and need to be cleaned out. Thanks for the help [...]	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1987 Buick Century Custom 2.5L engine VIN: 1G4AH51R5H Removed the rocker arms and checked the pushrods and found the blockage in the push rods .Cleaned pushrods out and got oil pressure .	11
	1995 Chevrolet K1500 Cheyenne 5.7L Excessive Emissions, Hesitation VIN: 1GCEK19K3S Thanks for all the responses. I am going to go with Jim from Texas. This truck needs more fuel. But customer is going to put original TBI engine back in truck at this time. I would have to dis agree with some of you that say pump pressure should double dead he...	30
	1995 Chevrolet Monte Carlo LS 3.1L no-crank VIN: 2G1WW12M8S Well it turned out to be a defective module from dealership! Here goes! I had good resistance readings from ignition keys @ steering column & module, also while CRANKING! Next I triple checked power & ground wire = ok. You need 5 volts from PCM to module (dk b...	10
	1995 Chevrolet C3500 Cheyenne 7.4L to much fuel/misfire VIN: 1GBKC34N2S Gentlemen thank you for all input.Me and the customer agree to disagree with the problem. We replace one injector,pressure reg,o2 sensor,customer put in new ac delco plugs,napa wires took off exhaust to eliminate cat, didn't help. I drove vehicle same amount o...	23
	1995 Chevrolet Lumina 3.4L engine VIN: 2G1WN52X75 Thank you to the the six that replyed to my post. I replyed to most but if I didn't respond to yours please forgive me. This car is running and customer will pick up this afternoon. As most of you allready know from my update, this engine wouldn't turn over be...	6
	1996 Chevrolet Cavalier LS 2.4L ABS modual VIN: 1G1JF52T4T Thanks To all who offered help. I suspect that those of you who suggested a master cylinder issue are likely correct. This is the recommendation I am going to pass on to the cars owner. At this time the car has not returned. I will update this further if the c...	9
	1997 Chevrolet S10 LS 2.2L Oil pan VIN: 1GCCS1949V The easiest way was to pull the transmission. Thanks for all the suggestions (the rear main was dry). You have to remove the oil pump before you can get the pan to come out.	13
	1998 Chevrolet Van G2500 6.5L Fuel Solenoid Driver Thanks to all who responded. I did not fix this truck myself. I got a lot of good responces and was what I asked for. The responce from James [...]'Dell worked the best. For all that don't know, GM has a Special Policy Bulletin No. 00064F that puts the injection p...	12
	1999 Chevrolet Express 1500 4.3L o2 moniter will not VIN: 1GCEG15W0X Thanks to all for all the input. Lots of replys on this one. This was at a buddy's shop, so I didn't see the truck or talk to the customer til this Sat. FIX was the thermostat and was held open just a crack by part of the o ring that they use for sealing it. T...	11
	2000 Chevrolet Impala 3.4L Rad VIN: 2G1WF55EOY Well thank you to all who sent their thoughts and ideas. From the start I believed that it was going to be a lower intake gasket, but without the blanent visual aids you normally get, I wanted to make sure. I did get a few good ideas on how to check things. Se...	30
	2001 Chevrolet Silverado 2500 HD 6.6L Surge, MIL Lamp on VIN: 1GCHC29181 I have a Friend that works for GM that showed me a bulletin on the fuel line from the filter that kinks and causes a restriction, I have replaced line and it appears to have repaired the problem Trouble codes: P0093.	5
	2001 Chevrolet Malibu 3.1L No Start VIN: 1G1ND52J61 well guys,this lady has an extended warranty and never brought the car back,ive talked to her and chevy did atop engine cleaning and changed out all her gas.still at chevy and still not starting.she says she would ove to bring it back so i can check it but she...	9
	2003 Chevrolet Cavalier 2.2L fuel gauge VIN: 1G15H12F03 Thanks to all who replied. The fix for this was replace the BCM. Glen from Ontario and Carl from Ohio both had the answer. Carl pointed out that the cluster gets its info from the BCM and the temp gauge will default to 160 if comunication is lost. Thanks again...	4
	1993 GMC Jimmy SLE 4.3L Cuts out, Misfire VIN: 1GDCT18Z6D Only receved 3 repllies they did not help as we had covered the ares allready. Customer took car and has not returned as of yet, sorry for the late post.I will post an update when fixed.	3
	2001 GMC C3500HD 6.5L Cuts out, Stall VIN: 3GDKC34F41 Hi Guys.this truck is fixed,we put in new thermostats{2} and new coolant temperature sensor,the customer has tried it every day for a week and it has been good,thanks to all who responded,cheers John Trouble codes: P0126.	9
	1995 Oldsmobile Aurora 4.0L starter VIN: 1G3GR62C7S THANK YOU TECHY'S...I found the purple wire going to the starter it was going in on the passengers side into through the valley. there was power to the purple wire but the starter would not turn. told customer starter had failed. there was anti-free in the val...	13
	1999 Oldsmobile Alero GL 3.4L Cooling Fans VIN: 1G3NL12E3X Thanks to all that replied found a blown fuse for A/C-BFC Has something to do with BCM all works fine Thank Again	8

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