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Prev Professional Automotive Repair Technical Discussions for April 25, 2007
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Open Help Requests for GM
Help Request Answers
1987 Buick Electra Limited 3.8L No Start VIN: 1G4CX5133H
This car was bought as a no start from goodwill. My question is regarding the cam sensor circuit. If I jumper A & B while cranking the car attempts to run. It has spark & noid after I do this. It does spit and sputter but I was thinking it was due to no cam re...
1991 Chevrolet V3500 Silverado 7.4L Poor Idle Quality, Poor Fuel Economy VIN: 1GCHV33N3M
Hi guys and girls.I bought this truck last October and have just recently put it on the road 2 weeks ago.The problem is the idle speed is not constant and to high.When warm it usually stays in the desired range of 750 but as soon as you open the throttle and r...
1998 Chevrolet S10 LS 4.3L Unknown VIN: 1GCCS19X8W
This is my actual personal truck, so I will be able to obtain info and play with it for a bit. I had put a new rebuilt motor and rebuilt the trans on this truck, now it seems like when from a stop, it has no power whatsoever. It almost seems like the trans is ...
1999 Chevrolet Lumina 3.8L Temp guage VIN: 2G1W52K4X9
The temp guage keeps going to hot. Scanner is showing normal temps and fan is coming on at the righ time. Have checked the temp sensor and replaced it twice. Replaced the connector, checked the guage itself by grounding it and moves back and forth freely. What...
1999 Chevrolet Silverado 1500 5.3L Poor Idle Quality, Surge VIN: 2GCEK19T3X
custormer complaint is when drives truck awhile pulls into store and goes in for about 15 to 30 minutes and returns to truck, he notices excessive cranking before motor starts. has no codes in system, hooked up fuel pressure gauge and readings are at 55 psi as...
2001 Chevrolet Corvette 5.7L irratic operation VIN: 1G1YY32GX1
please help gm techs. we are trying to help a customer that bought a salvaged corvette last year. customer has photos of damage- car was hit in the right front- hood was not even damaged. shop replaced r/front fender, straightened frame, and other work. vehicl...
2003 Chevrolet Express 2500 4.8L Starter VIN: 1GCGG25V43
This van has had the above noted new parts. After two weeks of driving it will NO Crank with the gear selection showing 2nd gear instead of park or N DTC 706. Clear code and the van runs for another two weeks. I have data stream values from today when this...
1995 Geo Tracker LSi 1.6L engine VIN: 2CNBJ1865S
Sent out head to get machined and replaced all gaskets. adjusted all valves to spec. reassembled, no start. noticed timed to wrong cam mark as there is two. "I" and "E". Changed to match t-belt books and Mitchell. No start. Cam sprocket is indexable in two way...
1994 GMC Olympia 5.0L co VIN: 1RC9408367
Getting complaints from our ice arena about heavy exhaust smell inside the ice arena. First thing I did was grab my CO monitor and I started at the Zamboni room and got a "0" reading. When I stepped inside the arena I got a reading of "20"PPM. Walking to the f...
1996 GMC Safari SLE 4.3L No Start, Flooding VIN: 1GKDM19W6T
Hey there, and thanks in advance. I have this Safari here which when I first started my diagnosis process after customer drivability complaint, I found Bank 2 of engine from front to back running completly rich ( 50%). after checking all, I came to think I had...
2002 GMC Sierra 1500 SL 4.8L antifreeze VIN: 1GTEC14VX2
Truck was down in texas this winter ran hotter then normal down there and the smell of burnt coolant started he came home and was ok until tues this week when it warmed up here & the smell came back , I talked to my local GM dealer and they had never heard of ...
1993 Oldsmobile Cutlass Supreme S 3.4L convertible VIN: 1G3WT34X0P
i have a 1993 olds with a convertible top. one of the power cylinders is bad and before i replace it i need to know what type of fluid goes in this system. mod has no info, as well as my friend at the dealership. the fluid in it now is clear like maybe brake f...
2003 Oldsmobile Alero GX 2.2L no start at times VIN: 1G3NK52F63
i suspect crank sensor any other ideas? now it starts again so i have not had opp to test crank sensor seems to start with extended cranking thanks mark
2000 Pontiac Bonneville SSEi 3.8L MIL Lamp on VIN: 1G2HZ5419Y
Code p0440 came back after replacing gas cap with an aftermarket one. not sure if cap itself is still casuing code, dose the code just want facroty cap? visual inspection turned up nothing amiss. smoked the system,no leaks seen except cannister vent solonoid. ... Trouble codes: P0440
2003 Saturn Vue 2.2L MIL Lamp on VIN: 5GZCZ33D13
This vehicle came in with the transmission shifting irratically, the check engine light on, and the power loss light on. Codes set for TPS and APP sensor. Replaced the throttle body assembly due to the tps is not serviced separately and the APP pedal assembly.... Trouble codes: P1275 (app sensor circuit fault)

Fixes & Summaries for GM
Fix/Summary Answers
1975 Cadillac Eldorado 8.2L compressor VIN: 6L67S50413
I am old enough to remember the super heat fuses, I just remember the chev's were close to the compressor. The Cadalliac had fresh tape on the wiring harness so I assumed they had wired around it. As most mentioned the fuse is on the evaporator housing and the...
1993 Cadillac DeVille 4.9L High Idle VIN: 1G6CD53B9P
Well I would like to say thanks to all that replied,they all helped.I ended up putting a new ISC motor in it.Also I did take a few attempts to get this car to learn the new Idle.All of you guys are great. Jon
1997 Cadillac DeVille 4.6L door locks,fuel door,trunk release VIN: 1G6KD52Y3V
Remotes must need to be programmed by Tech 2. As some replies mentioned. So I had to send customer to dealer, thanks for everyones replies.
1992 Chevrolet C2500 Cheyenne 6.5L overdrive VIN: 1GCGC24F1N
I am disapointed to have to close this request now, a lot of good ideas were given to me. This is was has happened in the last 3 weeks or so, Truck ran fine 4 about 200 miles without acting up, then 1 time it did act up without any testing equipment hooked up....
2000 Chevrolet Silverado 1500 4.3L No Start VIN: 1GTEC14WXV
I want to thank josh! Because his comments got me thinking I had sprayed ether in the throttlebody and the truck still would not start.So I went back and checked my coil it had a enough to fire the plug I was checking it with but not start the truck. I put a n...
2002 Chevrolet Trailblazer LS 4.2L MIL Lamp on, power loss VIN: 1GNDT13S12
Thanks to all that replied. GM Bulletin [...] Document ID 1561633 Hit the nail on the head. The document says to put a min/max meter on the 5 volt reference signal to the pedal position sensor and with a scan tool command the fan clutch on and off. You will... Trouble codes: P1271.
2003 Chevrolet Suburban 1500 LS 5.3L turn signals VIN: 3GNFK16ZX3
The fix was to replace the turn signal/flasher module. It is located behind the knee bolster in the area of your left knee. The updated GM part number is [...]. The flasher module is about 2-1/2' x 1' x 1' with 10 pins. To replace, remove the instrument c...
1995 GMC Jimmy SL 4.3L Pedal feel VIN: 1GKCT18WXS
well I checked out the rear brakes and found a frozen wheel cyl. so I replaced both rear cyls. and shoes and hardware pedal feel is a bit better I think I will do the same with the front and that should do it thanks for all your replies and to update some of y...
1990 Oldsmobile Delta 88 Royale 3.8L no start VIN: 1G3HY54C5L
i kept thinking the its the crank sensor because it has power and a good ground but no signal. i had replaced it 2 times and still no start and i also had no cam signal. i replaced crank sensor with a different brand and vehicle started up but ran like shit mi...
1995 Oldsmobile 88 Royale 3.8L battery VIN: 1G3HN52K2S
Hello, Thanks to all who replied, you are truly professionals and that's what makes this site so great!!! Problem turned out to be the alternator replaced and all works well!!! Customer stopped in yesterday to say he has had no problems since he brought it t...
1999 Pontiac Grand Prix SE 3.1L MIL Lamp on VIN: 1G2WJ52M8X
DOUBLE YOUR SHOP RATE IF THE CUSTOMER TRIED TO FIX IT FIRST!!! Thank you for all your replies. The biggest help was from Bob from Illinois. He gave me the voltage spec for the pressure sensor koeo, (1.3-1.7). I had 4.3 on my scanner. So I dropped the tank one ... Trouble codes: P0446 (evap vent system blocked).
2003 Pontiac Aztek 3.4L rear differental VIN: 3G7DB03E23
Its a very sad thing when you have to throw away a complete rear end because you cant find a few seals. I could have repaired this vehicle for about 500.00 dollars but instead it ended up costing the poor consumer 1400.00 for a used rearend installed. THANKS G...
1996 Saturn SL1 1.9L no upshift , MIL on VIN: 1G8ZH5281T
Thanks to all that replied .I especially appreciate pointing out to me that the P1555 'elec.var.orifice ctrl.' dtc that confused me was only for variable assist steering which the vehicle doesn't have . Most were in agreement that I had the wrong PCM . The rig...
2003 Saturn Vue 3.0L MIL Lamp on VIN: 3GZCZ53463
thanks to everyone for the replies. I will pass on the information to my friend and repost and updated on the vehicle if they come back or not. again thak you all for your time and posts. Trouble codes: 128.
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