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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for February 7, 2007
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Open Help Requests for GM
Help Request Answers
1993 Buick Roadmaster 5.7L Speedometer VIN: 1G4BT5373N
Need opnions or comments. Vehicle came in for no speedometer/odometer. First thing to check the speed sensor right? Well, no a/c signal backed by no signal on lab scope. Remove sensor, attach to drill and I can get a signal if I press against the sensor shaft ...
1995 Buick Park Avenue 3.8L volt meter VIN: 1G4CW5217R
I have a Buick Park Ave non supercharged. This vehicle when first started shows by gauge and test equipment that it is charging fine. I can get a little over 80 amps from 100 amp alternator under load on the car. Let it run about 10 mins and the gauge drops to...
1996 Cadillac DeVille 4.6L Poor Idle Quality, MIL Lamp on VIN: 1G6KD52Y4T
Good Morning We have this 96 Cadillac deVille with a DTC P0507 (idle 80 rpm over specs with throttle closed-desired idle on scanner is 640 rpm and the engine is idling at around 1050 rpm). Originally, this car came in from another shop where a used engine ass... Trouble codes: P0507 (High idle)
2003 Cadillac CTS 3.2L Mechanical VIN: 1G6DM57N93
Thanks in advance,I need some help from the cadillac guys this is a strange one.Cust stated that car was running great,Cust parked and went out of town for four days came back started car and engine is making noise from the upper end.Removed timing cover for i...
1990 Chevrolet S10 Blazer 4.3L Excessive Emissions, Poor Idle Quality, Surge, Misfire, Poor Fuel Economy VIN: 1GNCT18Z6M
BLazer came in a week ago with complaint of rough idle at stop. we tuned it up( cap ,rotor ,wires, plugs , ff, and cleaned throttle body.) they picked up drove it for 3 days and came back. said gas was running out the tail pipe. Well , pulled it in a confermed...
1998 Chevrolet S10 LS 2.2L MIL Lamp on VIN: 1GCCS1941W
Had Multiple Codes,PO172, Did Not Record Others,Figured Related To Bad Ground. Is Over Due For Inspection,Cleard Codes,Performed Drive Cycle. Code PO172 Came Back On Second Trip. No Other Codes. Truck Runs Fine But At 2500 rpm Long Term Jumps To 148. Right As ... Trouble codes: P0172
2000 Chevrolet Malibu 3.1L intake gasket VIN: 1G1ND52J6Y
Hi guys, I had a 2000 malibu 3.1 in my shop with an external coolant leak from the lower intake manifold gasket. Of course we know about GM,s very common intake manifold gasket problems. Is it possible to know with any certainty before replacing the leaking...
2002 Chevrolet S10 4.3L No Start VIN: 1GCCS14W42
Hi everyone on may 26 2006 this truck came with the complaint of rough running. The next morning i went out to bring it into the bay but the truck would not start. on the seat was an invoice from the local dealer recomending replacing the fuel injectors after ...
2002 Chevrolet Camaro 3.8L intake VIN: 2G1FP22K5X
hello iatn i have a 02 chevrolet camaro 3.8 v6 with a coolant leak, leaking into the combustion cambers causing a no start, car runs fine with no coolant and fresh plugs. once you fill with coolant,and pressure test the coolant disappears and now the car is a...
2004 Chevrolet Trailblazer LS 4.2L speedometer VIN: 1GNDT13S04
Customer complained about speedometer not working. Cruise works scan data normal, speed is reported to PCM. VSS waveform is pretty at PCM, total resistance for circuit is 1.35K ohms, I have no spec, not in All data. Digital signal from PCM to instrument cluste...
1997 GMC Savana 3500 6.5L Losing speed signal VIN: 1GTHG35F5V
Hello everybody, When we started working on this van I noticed that on the road test the speed signal would drop out and the van would hunt for gears. This happens more as you let off the throttle at around 60KM/H and when the vehicle is warm. The speed signal...
1991 Pontiac Grand Prix STE 3.1L Hesitation, Surge, Stall VIN: 1G2WT54T2M
Vehicle come in complaining of dying and hesitation. What I found is that it idles good but right off idle about 900 to 1000 rpm it will hesitate, surge and or dye. If I test drive it it will dye when comming to a stop. I reset minimum idle high to see if this...
1999 Pontiac Grand Am GT 3.4L Heater Core VIN: 1G2NW12EXX
Hello Put a new intake gasket in about two weeks ago. The owner says no heat from the heater at idle. I have bled the system a number of times. When you increase the RPM to 1500 you have lots of heat. But when you let it sit and idle you will lose all the heat...
2004 Pontiac Grand Prix GT2 3.8L Poor Idle Quality, Stall, MIL Lamp on VIN: 2G2WS52214
Towed this vehicle to the shop. Customer complained and we varified engine starts and idles rough and won't rev up and then stalls. The Check Engine light is on and the reduced power light is on. Checked the fuel pressure, good. Checked the codes and had a P00... Trouble codes: P0068 (Actual Throttle Position not as expected), P0010
1999 Saturn SL 1.9L Poor Fuel Economy VIN: 1G8ZF5283X
Hello everyone, I have this Saturn here with the customer saying that the fuel mileage is dramatically reduced. The car drives fine except I noticed when shifting (Man trans) the rpms briefly rev up like a stuck throttle and the customer said that just started...
2004 Saturn Ion-1 2.2L Starting VIN: 1G8AG52F84
Hello, I have a customer with this 04 Ion complaining of a very intermittent no start, no crank. The customer says it happens about 3 or 4 times per month. Customer leaves work and when she gets in the vehicle it will not crank over. She took note that the hea...

Fixes & Summaries for GM
Fix/Summary Answers
1996 Chevrolet Cavalier 2.2L Cooling Systems VIN: 1G1JC124OT
removed cylinder head. found cracks in #1 & #2 cyl's.installed used head. still had a high temp., but not overheating.the second thermo we installed was not the correct one. boxed wrong? this was giving us the low temp at cruise. installed a 190-195 which was ...
1996 Chevrolet Tahoe LS 5.7L noise VIN: 1GNEK13R3T
Thank you guys for the info the noise was my only concern with not recommending the multi-switch but it fixed the problem and no noise since thanks a lot.
2000 Chevrolet Blazer LS 4.3L No Start VIN: 1GNCT18W2Y
Good morning all. Everyone hit it on the head about the fuel pump causing the pressure drop. As stated in my post, I suspected the fuel module for the drop and fluxuating guage. What threw me was the pump priming when key was cycled off. I decided to do the mo...
2000 Chevrolet K2500 7.4L brake lights VIN: 1GCGK24J7Y
well i took afew days away from this truck to clear my head. i noticed the third brake light bulbs were blown. so i put two bulbs in it and they were dim. i know the white wire went off the brake switch to the relay but also ended up at the combo switch. to ru...
2000 Chevrolet Malibu LS 3.1L Instrument Panel VIN: 1G1NE52J4Y
Thanks to all that replied, it was the IPC that was bad.
2003 Chevrolet Express 2500 6.0L Hydro boost VIN: 1GAGG29U93
Thank you everyone for your information. After several of the replies came back as a normal operation, we explained again to the customer and they are trying it again. Thank you for the quick responses. Great program for technicians.
2003 Chevrolet Venture LS 3.4L Front wiper system VIN: 1GNDU03E03
Thanks to the 21 members who replied to this problem. I'm going to call this one fixed. The day after I posted the message I tested the wipers out and they worked properly, 100% of the time while the day before it failed everytime. I pulled the wiper arm off o...
2000 GMC Yukon SLT 5.3L MIL Lamp on VIN: 1GKEK13T1Y
I removed canister to check for presence of dirt or charcoal debris and it was clean, checked line from canister to vent valve and it was clean. I reinstalled vent valve and connected a short piece of hose to the valve inlet and to the mightyvac. I pulled a li... Trouble codes: P0440 (Small EVAP leak).
2002 Pontiac Bonneville SE 3.8L Starting VIN: 1G2HX54KX2
Wow this is the most replies I have had regarding a problem, 19 replies in all. Some said the vehicle needed to go to the dealership to be flashed after I installed a new ECM, however several folks like David, Alan, Carl, Stan and Csaba said to go to my local ...
2003 Pontiac Vibe 1.8L Unknown VIN: 5Y25L62883
thanks to all for the help. i went ahead and put on a new master cly. i roadtested the car and found that the temp. on all four of the wheels turned out the same. told the cust. and he is happy. once again thanks to all that replied
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