iATN Member GM Auto Repair Tech Exchange for August 7, 2007

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Open Help Requests for GM

	Help Request	Answers
	1999 Buick Regal 3.8L Starts & dies Vehicle will start , run 2 or 3 seconds & die. With fuel pressure gauge attached,key on pressure is within specs.When engine is initially started fuel pressure is within spec , THEN it slowly bleeds down to 30 psi & dies out When you remove the fuel pump/spee... Trouble codes: p0102 (maf low frequency code).	View
	1993 Chevrolet Lumina APV 3.1L No Start, no spray or injector So we meat again!!! :) Problem was intermittent. Vehicle was dead at customer's house, so I went out to look at it and found no spark. Then after witness no spark it had spark and ran. So we brought it back to the shop and could not get it to act up again. How...	View
	1996 Chevrolet Monte Carlo 3.1L Noise under load This is the second transmission I have seen with this problem, the first was a Grand Am, same engine type and year,we replaced trans with used,problem solved. Now I have this Monte Carlo and I would like to know if any of you trans guru's can tell me what is c...	View
	1997 Chevrolet Malibu 3.1L Low Coolant Light Hello all, I have a 1997 Malibu here that has the Low coolant light on all the time. If you disconnect the sensor the light goes out. I replaced the sensor and the light is still on. I checked the ground wire at the sensor and it is fine. I know the wire to th...	View
	1997 Chevrolet S10 2.2L Pings excessively Short block was replaced using the customers old head. Head was not milled. Injector pulse width is 4.2ms when pinging Egr seems to be functioning as designed Fuel psi is at 38lbs. Timing is at 30 degrees and retard is 14 degrees Engine temp is 190 degrees. N...	View
	1999 Chevrolet p30 7.4L compressor i have been checking this thing out for so long that i am starting to confuse myself. somebody set me straight please. My first question is: should the circuit from the ecm to the ac relay show 12 volts at anytime? Im thinking no. but i dont know for sure. It ...	View
	2000 Chevrolet S10 2.2L Misfire, MIL Lamp on Hi All, I have this 2.2l S-10 here, Customer states started missing and shaking on freeway. Had it towed in here. Found # 2 and 3 cylinders not firing, no spark. Swaped wires, no change. # 2 and 3 share the same coil pack, so I swapped coil packs, no change, s... Trouble codes: P0300 (Multiple Cylinder Missfire).	View
	2001 Chevrolet Express 2500 4.3L Misfire this express van 25000 change plugs cap wires missfires when giving it gass not when put in drive under load look on scanner all cyl is missfire new air flow fuel psi 60 check cam and crank sensor waveform looks good gooing crazy with this van than you	View
	2001 Chevrolet Tahoe 5.3L MIL Lamp on recheck everything seen to work good, turn on air pump, it run normal. might there be a problem with the switch air valve solenoid.? may i have some advice from chevy tech. thanks in advance, thoa Trouble codes: p0410 (air system).	View
	2003 Chevrolet S10 4.3L Starting customer concern is long crank time after vehicle sets for 15 minutes or so. prev repair was to fix fuel press drop with engine off, now thats ok or believe to be fuel press is 52 psi and left setting in an hour will be about 38. have also replaced passlock se...	View
	2004 Chevrolet Trailblazer 4.2L Hesitation hello and thanks ahead of time for your time. we have this trailblazr that has a hesitation when take off. it acts like it is starving for fuel. it is a dbw trk and my concern is that the dbw moduel is failing. i do not know much about these units sense they a...	View
	2004 Chevrolet Express 2500 6.0L Misfire vehicle came in because it was running very poorly at idle. we took it for a test drive and it sounded like it may have a burnt exhaust valve. did a compression test and a cylinder leak down test but everything checked out ok (sorry i don't have exact readings... Trouble codes: P0300.	View
	2004 Chevrolet Silverado 2500 HD 6.6L Hesitation, Cuts out i have a 2004 chevy duramax 6.6 lly under load with trailer kicks up a p1093 code which limits fuel pressure so it is very doggy un acc. until you clear the code then the truck drives fine until the code sets again. i have checked for fuel deliverly problems, ... Trouble codes: P1093 (fuel pressure low while power enrich).	View
	1996 GMC K2500 Suburban 7.4L Poor Idle Quality, Hesitation, Surge, Stall, Misfire, MIL Lamp on I'm hoping these symptoms will ring a bell with some of you guys.Vehicle runs very poorly and the kicker is this.When watching my Tech 11 scan data while the engine is running it will pop an intermittent crank sensor code within seconds after cranking followed...	View
	1999 GMC C1500 Suburban 5.7L Hesitation, Surge, Cuts out Please help I am losing my sanity. I have this suburban that this customer dropped off with a complaint of transmission shifting, well after a short test drive I noticed that when it shifts from second to third it feel like it runs out of fuel, just falls on i...	View
	1992 Oldsmobile Cutlass Cruiser 3.3L No Start, Cuts out, Stall, Misfire this vehicle came back yesterday stalling, misfiring, checked & repaired grounds for ecm, still stalls intermittent , wiggle & tap test on ecm & all sensors & harness, checked injector resistence all checked 12.6 ohms, today after cold start no problems, cant ...	View
	1989 Pontiac Grand Prix 2.8L No Start Car tuns over like timing is of, like when firing order is not right. Checked crank signal on lab scope looks good. I have injector pulse,spark, fuel pressure, compression is good. took engine top apart to look at valve train everything looks good, push rods a...	View
	2002 Pontiac Montana 3.4L Unknown Hi,I have a Montana van that does not cool all that great.I have about [...] air out of the vent.At an idle the presures are 49 on the low side and 178 on the high,at 2000 RPM's it at 31 and 232.Presures seem decent.But I still have no cooling.Any Ideas?	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1989 Buick Riviera 3.8L touch screen dash control THANKS TO ALL THAT RESPONDED.I GOT SOME REALY GOOD FEEDBACK.SEEMS THIS WAS A SEMI COMMON PROBLEM & THEIR ARE TWO COMPONANTS TO THIS SYSTEM.FIRST IS A CENTRAL POWER SUPLY LOCATED IN THE ABOVE GAS PEDAL AREA.NOT TO BE CONFUSED WITH AIR BAG MODULE IN SAM [...] AREA.CK...	12
	1998 Buick LeSabre 3.8L security light Thank you to all who replied. We had checked for codes and no codes were found in the bcm or pcm. We inspected for broken wires coming off of the ignition switch which is often a problem, but not in this case. We did do the relearn procedure 4 times (just i...	15
	1984 Chevrolet Corvette 5.7L transmission thanks to every body, lots of help on this one,mounts are ok you dont have to give it much gas for it to slip. customer took car home with him he is gona save money and put transmisson in car.	16
	1995 Chevrolet C1500 4.3L compressor well this one was a fun one i put the comp accumulator and orfice tube evap due to breaking of tube after repair it was a after market clutch cycling switch put a true ac delco switch and now it seems to be working good thanks to all who replied that why i lov...	11
	1998 Chevrolet K2500 5.7L Hesitation, Cuts out thanks to ralph at identifix found that i had 2 proms. the first being crank sensor needed to be shim to get the timing to work right. with that being done unpluging the mas air flow took care of the rest. replace mas air flow all is fine. if i remove the shim...	31
	1995 GMC Jimmy 4.3L No Vent Up Hills The vacuum system was full of ATF . Customer declined replacement of pods in the dash.Added an electric vacuum pump to the system, out of a 97 F250 Diesel.It fixed the problem.	32
	2002 GMC Sierra 2500 HD 6.0L fuel tank I did not get the job. The customer decided to drive it back home in Georgia. I didn't get to diagnose the problem. Thanks to all who replied.	8
	1998 Oldsmobile Intrigue 3.8L security lite thank everyone for there replies,but was not much help,I have done all this more than once.The fix was to replace bcm and program then keylearn.just because things work that the bcm controls and the scanner communicate with bcm,pcm,abs,ipc,does not mean they c...	12
	2000 Oldsmobile Bravada 4.3L engine Several replies were to check crankshaft end play, spec. in Alldata was .002 - .008, measured .008. Other replies suggested flywheel which is what we think it is, however the customer declined any further repiar/diagnosis at this time due to cost. Thanks for ...	9

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