GM Automotive Technicians Technical Discussion and Fixes for Jan 30, 2004 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1989 Buick Riviera T-Type 3.8L tcc lockup+1-2 shift VIN: 1G4EZ11C8J The car starts right up idles fast till warm up all is well until you attempt over 25-30 mph (regardless of gear selection, 1st, 3rd, 2nd, drive, etc.) Then right when the upshift to 2nd gear should occur, the engine cuts-out-as if on a sort of "rev-limiter" t...	View
	1992 Cadillac DeVille 4.9L heater core VIN: IG6CD53B8N Hi guys, this Cadillac came in for a no heating problem about a month ago and I still haven't figured this one out. It has heat while in the shop; however, when you drive the car down the road the heat goes away (turns cold). The wierd thing is that the car do...	View
	1993 Cadillac DeVille 4.9L remote keyless entry VIN: 1G6CD53B9P Help,this one has me stumped. RKE transmitter won't stay programmed. You can program key fob and everything works like it should,but only for 30 seconds. Something clicks behind the glovebox and key fob quits working. I traced the click down to a small module ...	View
	1989 Chevrolet C1500 Cheyenne 5.7L Poor Idle Quality Gentlemen, this one has me stomped. Keep in mind that this is a theft recovery truck that used to have a diesel in it. It has had a 89 model 5.7, computer, and harness put in it. I checked the prom and computer# just to be sure it had the right components in i...	View
	1995 Chevrolet Blazer 4.3L No Start VIN: 1GNDT13WXS this vehicle has been in multiple times for no start condition, intially the were spark issueswith good fuel delivery. now then there are fuel delivery issues. the last 4 trips into the shop we have had every thing necessary to the computer but no injector pul...	View
	1995 Chevrolet S10 4.3L coolant temp Greetings from the frozen tundra of Wisconsin, This truck came to me after owner had experienced temp. readings climbing above 260. He and his dad (a mechanic) changed thermostat,no change, they changed sending unit for gauge (in head) , no change. We concured...	View
	1999 Chevrolet Tahoe LS 5.7L Surge, Cuts out, BUCKING VIN: 1GNEK13R2X Hey guys, hope someone could help with this one. You guys helped me before in the past. Another tech here was working on this Tahoe for a catalytic converter code. He replaced the O2 and vehicle was returned 50 miles later, customer complaining of a bucking ov...	View
	2002 Chevrolet Silverado 1500 5.3L No Start VIN: 2GCEK19T12 Customer was towed in for intermittant no start cold (below 25 degree's). We found The vehicle had no spark. Fuel pressure test ok. No codes stored in ECM memory. Found 40 degree temp reading differance between mass air flow meter & cts reading. Cts was readin...	View
	1990 GMC K1500 Sierra SLE 5.7L Poor Idle Quality, Hesitation, Cuts out, Stall VIN: 2GTEK19K6L vehicle first came in for a no start condition.Found that ignition module was bad.replaced module and truck started and ran fine. Came back 2 weeks later complaining of not ideling when hot.(intermittent)Took out for test drive and couldnt duplicate proble.	View
	1993 GMC K1500 Suburban SLE 5.7L Cuts out VIN: 1GKFK16K4P please gm techs help//this tahoe rolled in friday morning with a hard and sometimes light buck when accelerating//and will always pop back thru the throttle body///checked fuel psi//which hard to do on this one with no test port but it was at 12 at idle and cr...	View
	1998 GMC C1500 Sierra SL 5.0L MIL Lamp on VIN: 1GTEC14MXW Hi everyone, this vehicle came in for a tune-up(cap,rotor,plugs & wires), everything went normal except for a tiny coolant leak at pass front corner of engine. Vehicle was re-booked for later in the week to check this out and customer left, check engine light ... Trouble codes: P0404 (EGR System)	View
	1999 Oldsmobile Intrigue GLS 3.5L Stall, STALL AFTER COLD ST VIN: 1G3WX52H0X THANKS FOR CHECKING THIS OUT- Scenario 1 Intermittently stalls after cold start (within 15 sec to 3 min, when stall occurs, and the key is not turned off, just returned to the crank position the theft code will be present(will be in the theft enable mode star... Trouble codes: P1626 (fuel enable circuit)	View
	1997 Pontiac Bonneville SE 3.8L No Start VIN: 1G2HX52K4V this one is the classic cranks/ no start. at the end of my rope here, as above tests state, i've got fuel, compression, injector pulse, spark, no codes stored. i replaced the MAP sensor because it was found to be damaged, still no start. this thing was really ...	View
	1999 Pontiac Sunfire SE 2.4L overheats VIN: 1G2JB524XX this vehicle is in for a overheating problem when overheating occurs the fan is not coming on. so my diagnosis is as follows. verified that engine does overheat. when overheating occurs the fan does not come on, checked for codes and none were found. when i tu...	View
	2000 Pontiac Montana 3.4L No Start, Poor Idle Quality, Stall VIN: 1GMDU23E6Y Hi group, This one is weird. Car is very hard to start cold. You must hold the gas pedal partially and control the idle yourself. It won't idle on it's own. Sometimes it is high and other times it's low. Check for TSB's. Found 01-08-45-005A that indicates the... Trouble codes: P0300, P0410, P0506, P0507	View
	1994 Saturn SW2 1.9L High fluid pressure VIN: 1G8ZK8575R Car was towed in. Customer had hit something in road. This bent the A/C condenser and radiator back smashing the cooling fan and shroud. No no ther visable damage other than the bumper. We replaced damaged items and drove car out of shop only to have the trans...	View
	2000 Saturn SL1 1.9L anti theft VIN: 1G8ZH5283Y After replacing ingnition switch and housing it appears that anti theft system is disabling ignition circuit. Vehicle starts but shuts down immediatley. I have tried running the auto relearn proceedure which is the following: Turn key momentarily to start posi...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1998 Buick Park Avenue Ultra 3.8L steering VIN: 1G4CU5218W iATN members ROCK! This one is fixed! I would like to thank everyone who responded. The fix was to reposition the rear trans mount. Special thanks to Christopher [Pennsylvania], Marty [Washington], Larry [Arizona] and Kenneth [New York] for leading us to the...	22
	1992 Chevrolet Camaro RS 5.0L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Stall VIN: 1G1FP23EXN hello and thank you all for the help. the biggest help i got was rebuilding my confidance. almost all replays came back to double check fuel psi and volume. still good-psi at 11psi and volume 16oz in 30 sec. but there was one thing that i hadn't done. i hadn't...	8
	1995 Chevrolet K1500 5.0L Clutch VIN: 2GCEK19H7S Pulled trans again and found my tech had miss-installed release bearing in fork. Live and learn! Great info on different methods of bleeding air from system, Thanks,	14
	1997 Chevrolet S10 4.3L frt. axle actuator VIN: IGTDTI9XIV Thankyou to those who responded.I pulled the axle tube and inspected the shift fork and collar and decided there wasn't enough wear to cause a problem. The cable was fairly stiff so I ordered one and installed it,and reassembled the unit, but the axles still w...	5
	1998 Chevrolet Tahoe LS 5.7L No Start VIN: 1GNEK13R3W The truck has been starting great for 2 weeks now. After the last no start I found the plugs were actually gas fouled, the Snap-On Vantage was not showing injector pulse. Actually the injectors were firing. After I changed plugs and started truck the Vantage s...	18
	1999 Chevrolet Silverado 1500 5.3L loosing coolant VIN: 1GCEC19T4X Thanks to the 12 who replied nine suggested intake gasket two suggested engine oil cooler and one suggested more testing. I finally broke down the motor, found a head gasket cracked at the coolant port front of the block pass side. For all that suggested intak...	12
	2001 Chevrolet Tahoe 5.3L coolant VIN: 1GNEK13T91 I thank all who have replied on this trouble vehicle, although we were not able to fix this one. The coolant mixture was not too rich as many had replied, also the ground to the engine and the ECT were less than .03v, and the fan clutch did release. We cou...	8
	1996 Geo Tracker 1.6L Hesitation, Cuts out, Stall VIN: 2CNBJ1866T further testing found ign timing severly retarding off idle replaced dist assembly with a used one and car runsfine	None

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