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Prev Professional Automotive Repair Technical Discussions for November 20, 2004
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Open Help Requests for GM
Help Request Answers
1991 Chevrolet Lumina Euro 3.1L Injector electrical circuit VIN: 2G1WN54TXM
This vehicle came to me in a non-running condition. I did manage to get it started once and it ran perfect with only a slight misfire at idle, possible a lean-idle mix. Anyway, then it just quits. While running the engine had good vacuum (18"), ran and idled s...
1991 Chevrolet Lumina Z34 3.4L Camshaft Carrier/Housing VIN: 2G1WP14X4M
This car was brought in with the cylider heads already taken off and "all the parts" in the trunk. The only information I can find about torque specs for the camshaft carriers says that they are to be torqued at 18 ft lbs. Yet when I torque them down, I can co...
1999 Chevrolet K1500 Suburban 5.7L Outside Ambient Temp Reading VIN: 1GNFK16R9X
Vehicle came in with the temp readout on the rearview mirror indicating "OC". This is new to me and I'm not sure what that might mean (open connection?). The vehicle had a new windshield installed recently. Checked the outside temp sensor resistance per Alldat...
2000 Chevrolet Tahoe LT 5.3L Hesitation, Surge, Misfire VIN: 1GNEK13T5Y
Good day everyone. I have this 2000 Tahoe that has been passed to me from another tech at the shop.The vehice first came in for a rough running complaint.codes were checked-history codes had a po300 random misfire.Fuel pressure was not holding like it should.S...
1989 Oldsmobile Cutlass Ciera SL 3.3L No Start, Poor Idle Quality, Stall VIN: 2G3AM51N7K
Car came in previously with maf code, with a cracked case on the maf, and stalling condition, installed a new maf. Problem solved. 3 months later car is back with same problem but without the maf code. We tried a different new mass air flow with no luck, and a...
1995 Pontiac Sunfire SE 2.2L Poor Idle Quality, Stall, Misfire VIN: 1G2JB1241S
This car came in with a stalling problem. Plugged my scan tool in to find DTC72 loss of serial data,further investigating, came up with an air bag code as well code DTC 61 SIR indicator circuit failure. After I pulled the high school kid pictures off the instu... Trouble codes: 72 (Loss of serial data), 61 (SIR indicator circuit failure)

Fixes & Summaries for GM
Fix/Summary Answers
1987 Chevrolet R10 Scottsdale 5.0L turn signal flasher VIN: 1GCDK14H4J
OK folks, here we go...,the underlying problem was me, NOT wiring the PROPER/CORRECT trailer harness (truck side) to the OEM harness. The OEM flasher ALWAYS worked properly, IF, the trailer plug was not attached. The turn signal/4 way switch has ALWAYS functio...
1993 Chevrolet S10 Blazer 4.3L No Start
First of all i want to thank all that responded. Those of you that said pressure regulator were right tapped on the regulator a few times and the truck runs now. Advised customer that the pressure regulator needs to be replaced customer doesnt have the money t...
2000 Chevrolet Malibu 3.1L MIL Lamp on VIN: 1GG1ND52J0
This one is 'Down the Road'. Turns out that the signal wire was nearly out of it's connector at the EGR Valve. We erroneously thought that since the scantool would show the valve being commanded open in 10% increments, that the circuit was fine (we even had pr... Trouble codes: P0403 (EGR Pintle Position Error).
1996 Pontiac Sunfire SE 2.2L Poor Idle Quality, Hesitation, Surge, MIL Lamp on VIN: 3G2JB5241T
I replaced the gasket at the back of the cyl head that is between the cyl head and the EGR support plate, the plate that you bolt the EGR valve to. That plate lets the EGR gases pass through to the EGR valve and then to the intake manifold. Also I replaced the... Trouble codes: P0171, P1171 (Fuel system lean during accel).
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