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Prev Professional Automotive Repair Technical Discussions for August 9, 2004
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Help Request Answers
1988 Cadillac DeVille 4.5L Poor Idle Quality VIN: 1G6CV115KJ
This car has a hight idle about 2,500 to 3000 we replaced a broked IAC motor and adjusted the TPS. one screw is broken off sot is hard to set but it is at .50 volts with the IA retracted. The car will idle perfict for about 8 to 10 miles then it races and will...
1991 Cadillac DeVille 4.9L Poor Fuel Economy VIN: 1G6CD53B2M
Hello everyone, I got this caddilac with a intermentent code 91. Snapon trouble shooter says something about a starter brace. The car runs good, exsept the customer said fuel mileage was off 6 miles per gallon. If anybody has seen this code give me some help t... Trouble codes: 91
1994 Chevrolet Lumina APV 3.8L charging system VIN: 1GNDUO6L5R
What a way to start my last week at the shop. This vehicle had come in on Friday charging at 17.5 volts with the ABS and Air Bag lights on and a surging problem. Checked system and quoted an altenator replacement. Customer declined repair, took vehicle, and re...
1995 Chevrolet Lumina LS 3.4L Surge VIN: 2G1WN52X7S
This vehicle when started will go to 4000 rpm and then slowly die down to 1000. Then the idle will surge from 950 to 1000 until warmed up. Replaced iac. Checked for vacum leaks, none apparent. Wondering if anyone else has run into this. I suspect leaking intak...
2000 Chevrolet Prizm 1.8L MIL Lamp on VIN: 1Y1SK5284Y
I followed the service procedure to inspect the CMP actuator circuit. When I directly energize the solenoid, the car stalls. I read the wrong resistance spec in the manual and replaced the CMP actuator solenoid believing that it was partially shorted, same pro... Trouble codes: P1656 (The PCM detects an open or a short in the CMP actuator solenoid control circuit.)
2003 GMC Yukon Denali 6.0L traction VIN: IGKEK63U53
the problem i,m having is usually happens from a dead stop,upon accerating the traction message will appear and the truck will not accerate for a few seconds,but will recover and everything will go back to normal.i do not have an abs cartridge f...
1999 Pontiac Grand Prix GT 3.8L Poor Idle Quality, Stall VIN: 1G2WP52K9X
Vehicle will idle fine when cold. After it is warmed up and the air conditioner is on when the A/C clutch cycles the engine surges and sometimes stalls. Car was tuned up with new plugs and wires. Throttle plates, IAC and MAF sensor were cleaned but so far noth...
2001 Pontiac Grand Prix GT 3.8L Excessive Emissions, Poor Idle Quality, Hesitation VIN: 1G2WP52K01
I am having difficulty with this 3.8 .. The car has no power and idles rough. Ignition looks good , fuel pressure is right at 50 psi (in spec).. However it has 8 lbs of backpressure in the exhaust.. After removing the cat.. the power was restored but the idle ...
2001 Saturn SW2 1.9L Electronic VIN: 1G8ZN82761
i need help from a veteran saturn elect. tech. this car came wiht the ac blower on withe key off . only way to getit top shut off is cycle the key on and off a couple times. does every third or fourth drive cycle. thanks in advance for any ideas

Fixes & Summaries for GM
Fix/Summary Answers
1992 Chevrolet Lumina 3.1L No Start, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, MIL Lamp on VIN: 2G1WL54T5N
Thank you for all of your responses, you saved me a ton of time. The problem was indeed the short harness between the crank sensor and the ignition module. Where it passes by the lower motor mount it was worn through to the copper. I replaced the whole harness... Trouble codes: 42 (esc problem).
1995 Chevrolet Camaro 3.4L No Start VIN: 2GIFP22S5S
Thanks to those that helped on this one, as you know intermittent failures are the worst. The key to this one was spark or no spark when problem occured. The technician was sure the spark was going away. He was using a spark tester connected to a plug wire at ...
1998 Chevrolet Camaro 3.8L Hesitation VIN: 2G1FP22K4W
Hello everybody and thanks to those who replied.The fix for this car was to NEVER ASSUME ANYTHING. I got involved with this vehicle after several other people got their hands into it. You can never tell if the problem was always there or if it was caused by so...
2000 Chevrolet Astro 4.3L Interior VIN: 1GCDM19WXY
well gentlemem this is what i have found and it has fixed the vehicle. the courtesy lamp relay supplies ground to all dome lamps and interior lamps, and the inadvertant power relay supplies all 12 volt feed to lamps and bcm. at first what concerned me was the ...
2002 Chevrolet Impala 3.4L performance VIN: 2G1WF55E12
Thank you one and all.The problem was a plugged convertor. The dealer had said they dropped the exhaust.After receiving the replies from IATN, some suggested a plugged exhaust. So WE dropped the exhaust. BINGO! Assume nothing, check everything! Alot mentioned ...
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