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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for August 18, 2004
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Open Help Requests for GM
Help Request Answers
1990 Buick Century Custom 3.3L No Start, Poor Fuel Economy VIN: 1G4AH54N1L
fuel pressure regulators have been replaced 3 times, within weeks of each other. last time the starter nose was broken as well. regulator diaphragm leaks , allowing fuel to be sucked through vacuum hose and floods engine causing no start. our suspect is backfi...
2000 Buick Park Avenue 3.8L No Start, hard start VIN: 1G4CW52K2Y
Hello-I have a hard start problem after a 2 minute hot soak. It always starts imeadiatly if it is restarted before 1-2 minutes. Takes 6-8 seconds of cranking to get it going after that. I thought it would be loss of fuel pressure but it never loses one pound o...
1977 Cadillac Seville 5.7L No Start VIN: 6S69R70494
what started out as a very intermittant crank but no start, and always was fuel pumps not coming on now is a consistent no start, cranks fine. there is no power to pumps, jumping power back at pumps starts vehicle immediately. researched iatn fix database, doe...
1993 Cadillac DeVille 4.9L Excessive Emissions VIN: 1G6CD53B3P
This Caddy came in with a complaint of "Runs rough-idles rough, down on power". The throtle actuator was causing the engine RPM to surge. The TPS was replaced because of varying closed throtle voltage reading (.45-.8 V). Then the throtle body was serviced (ver...
1993 Cadillac Eldorado Sport 4.6L Poor Idle Quality, Surge VIN: 1G6EL12Y7P
on first start up car stalls on second try car searches for idle for 2 sec. then idles fine turn car off start up again no surge let it set 5 min. start idle surge 2 sec.then idles fine Trouble codes: 32 (map sensor low or shorted), 71 (inter map signal)
1995 Cadillac DeVille Concours 4.6L clicks the throttle VIN: 1G6KF52Y8S
Well this car has a mind off its own ,the customer just got it back from the dealer for a fuel rail recall ,and now when you turn the key off the iac motor clicks the throttle about 20 times, with out the engine running if you turn the run position it still cl...
1995 Cadillac DeVille 4.9L traction control VIN: 1G6KD52B1S
This Deville came in for brake service the front brakes were worn down to the backing plates and so were the rears. After it was complete the car has the traction control light on. The code we got was T033 but we cannot figure out what this refers to, none of ...
1995 Cadillac Seville SLS 4.6L blower
hello there fellow techs. i only have a question. this seville is there any way or does anyone know anywhere to just purchase the squirrel cage? every one i talked to says you have to buy the blower assembly.or will a cage from another vehicle work?. any help ...
1998 Cadillac DeVille 4.6L Poor Fuel Economy, MIL Lamp on VIN: 1G6KD54YXW
Hello to all,I hope there is someone out there who can help. This is my wife's car and she is threatening to trade it in if I don't get it fixed.On 7/10/04 the ses light came on, I hooked up my Tech II and retrived code p0154. So I scaned the o2 sensors and b1... Trouble codes: P0154 (lack of o2 switches b2s1), P0151 (o2 low voltage b2s1)
1973 Chevrolet suburban 350CID Power operated Tail gate VIN: CCY163F126
I have a problem with my tailgate power window. Everything was fine, except the key operated switch at the tailgate wasn't working. I replaced the switch and it worked for about a week. Now the window rolled down and now won't go back up. My problem is i can't...
1992 Chevrolet Blazer Cheyenne 5.7L Poor Idle Quality, Stall VIN: 1GNEK18K8N
This '92 Blazer came in originally w/ the guages on the dash all reading lower than normal and the wipers intermittently turning on/ off. The more electrical accessories you ran the more wierd things it would do. Traced that down to low voltage supply in the c...
1994 Chevrolet S10 LS 2.2L pump / bushing VIN: 1GCCS194XR
Auto trans guru's - I do not do auto trans repairs but am stuck with this one and need help! An ex-employee worked on this truck 4000 miles ago and it is back. Originally the truck had a frt seal leak and upon disassembly found the torque converter snout broke...
1995 Chevrolet C2500 Cheyenne 7.4L Poor Idle Quality, Surge VIN: 1GCGC29N4S
This pick-up starts and will die. After starting it will surge severly up and down,sometimes dying. when it is surging the IAC motor opens and closes like it is trying to regulate the idle speed. I checked codes and it has none. While this is occurring I can i...
1995 Chevrolet Corvette 5.7L Cam/Distributor VIN: 1G1YY22P9S
Howdy, LT1 mavens: This car has been essentially trouble-free for 6 years, except for a blown coolant hose several months ago, until it stopped DEAD in front of a non-GM dealer lot. They replaced many parts (coil, module, maybe ECM and/or distributor) and ret...
1997 Chevrolet Venture 3.4L Misfire, MIL Lamp on VIN: 1GHDX06E4V
I actually have 2 of these vans that have came in with the same problem this week. The code P0300 is the only code in the van but it is just cylider #6 misfiring. Upon cold starup, cylinder 6 will count up 30-100 misfires in the first 10-15 seconds than run fi... Trouble codes: P0300 (Random cylinder misfire)
1998 Chevrolet Blazer 4.3L blend air door motor VIN: 1GNCS13W3W
cust. brought car for air blowing hot and cold air out vents.ck the system and thought the control head may be out.replaced control head and didn't change the problem.got wiring diragrams and ck wiring from control head to blend air door motor. wiring all ohm ...
1999 Chevrolet Corvette 5.7L harmonic balancer VIN: 1G1YY22GXX
vehicle is a stick shift vehicle.the flywheel and harmonic balancer are balanced units.we found out today the engine came out of a camaro which does not use a balanced flywheel or a balancer that is weighted.the 1997-2003 5.7 LS-1/LS6 engine with a crankshaft ...
2001 Chevrolet Suburban 1500 5.3L power steering VIN: 3GNFK16TX1
has a hard spot when turning wheel left or right give it some gas and it will have power steering. Installed used pump (2-miles on it), DVOM the valve at the pump it will variy from .6 (at idle) to 6.0-volts when the rear wheels are moving. could I have a bad ...
1997 Geo Tracker 1.6L No Start VIN: 2CNBJ1361V
Thanks in advance for your time. Vehicle cranks, no start. have spark at plugs and fuel(plugs are wet with fuel).I have a signal to injectors. Timing belt ok, compression ok. Started twice(acted like no power)Tac does not read when cranking. I can't scan due t...
1996 Pontiac Sunfire SE 2.2L No Start VIN: 1G2JB1241T
a real problem child here. this vechile will run with ignition switch in [...] position as soon as the switch is released to the run position i lose injector pulse and vechile quits.also if you feed fuel to the intake it will run. also the theft system light s...
1996 Pontiac Bonneville SSE 3.8L blower VIN: 1G2HZ5214T
this car has very poor air flow out the dash registers.

Fixes & Summaries for GM
Fix/Summary Answers
1982 Buick Century Limited 3.0L Hesitation, Stall, MIL Lamp on VIN: 1G4AL27E5C
Had lots of replies but nothing that fixed car or hadn't already been tried, so after making 100% sure the motor was sound and in time I tore the stupid carburator off again with an idea that maybe it was warped like the quadrajets used to do. Bingo, we tried ... Trouble codes: 44 (Lean Exhaust).
1989 Buick Reatta 3.8L abs VIN: 1G4EC11C2K
Hi all, recieved 2 responses on this one and they suggested monitoring the current or voltage at the main valve whern the car was moving we tried this and had no change in the readings from idle to moving but the code still sets. The customer needed the car ba...
2002 Buick LeSabre Custom 3.8L Speedometer VIN: 1G4HP54K82
Well Techs the fix was easy on this. Thanks to all three who replied. Ray [...] suggested had the trans been replaced and the answer to that was no. Orlando suggested had I checked the speed sensor, but data stream scan info was showing the correct speed on th...
1990 Cadillac Seville 4.5L MIL Lamp on VIN: IG6CD5336L
most replies suggested cleaning the EGR tubes in the throttle body - i did this and have not heard back from the customer. i will assume from this that the problem has been resolved. other replies indicated ground issues and possible MAP sensor problems...thes... Trouble codes: E48 (EGR system problem).
1964 Chevrolet chevelle mal 327CID horn,interior lighting VIN: 45867B1083
thanks for all of the wiring diagrams. i found the ampmeter wires to the gauge melted. ran new wires and all is well. its great to know you guys have all these old diagrams. thanks again
1988 Chevrolet S10 Blazer Sport 4.3L Stall VIN: 1GNCT18Z0J
Thanks for the great sugestions. I was able to check the ground when it acted up and they were good. The problem ended up being the tcc solenoid (probable bad diode) causing the computer to freek out. Kind of sucks that that was the first thing that the troubl...
1995 Chevrolet Blazer 4.3L Excessive Emissions, Poor Idle Quality, Misfire VIN: 1GNDT13W7S
Sorry I haven't posted the fix yet, but it is fixed now. The morning after I posted this, I decided to pull the plenum back off and found that the fuel supply line was cracked just inside of the plenum. It was spraying fuel almost directly into the #5 port in ... Trouble codes: P0300, P0305.
1997 Chevrolet Tahoe LS 5.7L 2-3, 3-OD shift VIN: 1GNEC13R9V
Again iATN has saved me unnecessary waste of valuable time. Since I had recently rebuilt the trans, I took the advice of Bob-NY, and Gerald-SC. I first pulled the VSS & looked in the opening, It appeared that the sensor gear fixed on the tailshaft was not in l...
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