Prev iATN Members TechHelp for March 17, 2008
Automotive Technical Exchange for the Automotive Repair Professional
Next
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Open Help Requests for GM
Help Request Answers
2005 Buick Century 3.1L security
Help This car has been driving me nuts for a week now It has a interment no start It will just crank and crank I have fuel presher and spark and I get a inj pulse with a lab scope I have put a module on it and 3x crank sensor and this did not help I put new pl...
View
1994 Chevrolet S10 Pickup 2.2L no power
Customer said car has been running bad for about 1 year. Test drive shows poor power.Customer also stated he heard a rattling noise in exhaust that eventually stopped. Vehicle acts like cat convertor clogged. Tested vacumn at 2000 RPM for 2 minutes 20 in. No s... Trouble codes: 44 (Lean exhaust).
View
1995 Chevrolet Pickup 6.5L Hesitation, Cuts out, Stall
I assumed this would be a typical fuel injection driver module replacement on a 6.5L turbo diesel to cure a quitting problem and also a hiccup problem. So I went ahead and replaced it. I have yet to hear if the quitting problem is completely gone since it can ...
View
1999 Chevrolet Monte Carlo 3.8L No Start
we have no spark but injector pulse and fuel pressure. 2 different ign modules installed, good power and groud. good crank sensor ( 3x and 18x signal), cam sensor good (inj pulse sync through pcm only, not spark control). put new crank sensor in anyway, tone w... Trouble codes: p0440 (evap system large leak. No pending codes under generic obd2).
View
2000 Chevrolet Silverado 6.0L 6.0 to 5.3 swap
The 6.0 in this truck is bad. The customer wants to replace it with a 5.3. I told him there can be lots of problems; He said he would get the whole used engine, wiring harness and PCM.. I see on the wiring diagram that will give trans problems because of diffe...
View
2001 Chevrolet Malibu 3.1L Poor Idle Quality
After finishing intake manifold job and road testing several miles-thought everthing was done until last acceleration the rpm's stuck at 2500.I pulled car over thinking the throttle cable or throttle body was stuck.I snapped the throttle several times and you ...
View
2002 Chevrolet Venture 3.4L Hesitation, Misfire
this van has a hesistion,showing multiple misfires sometimes.when the van comes in no misfires show on current or history misfire data.I have only seen misfires once out of 5 times I have taken van out for test drives,misfires where on all [...]&5 had the...
View
2002 Chevrolet S10 Pickup 4.3L electronic brake control module
Truck came in customer stated dash lights all came on and shortly the went out. the only ones that remained on were ABS and Brake light. checked for codes and found above codes. Ran alldatas diagnostics and thinking the ebcm is faulty but wondering if any one ...
View
2003 Chevrolet Malibu 3.1L cruise control
I have a 2003 chevy malibu with 61000 miles on it. The problem is that when you turn the cruise control on or off it makes a clunking noise from the right front corner of the car. It does not do this with just using the pedal and brakes so it rules out all but...
View
2006 Chevrolet TrailBlazer 4.2L MIL Lamp on
hello all good tech, i replaced the air pump relay and now the pump and air solenoid are both working but the mil keep coming back on with p2431.air pressure sensor show on mod but i couldn't find it.anyone know where it is located and what is the common probl... Trouble codes: P2431 (secondary air injection pressure sensor a crt).
View
2002 GMC Envoy 4.2L Starting
well this was supposed to be a simple one, i replaced the battery on this truck now the truck will not even crank over. all the dash lights come on the battery is fine and it sets a p1631 securty code when you crank it, has any one ever seen this. by the way i...
View
2000 Oldsmobile Alero 2.4L Misfire
Good morning all, I'm having fun with one of these chevy 2.4l with the coil pack assembly cover pieces and guess what, a misfire. It was in last week for the same problem, a misfire under load, leading me to believe it was a weak spark issue. Once I got the ig... Trouble codes: P0301 (Misfire detected in cyl 1).
View
2000 Oldsmobile Bravada 4.3L Misfire
hi guys, i'm fresh outta ideas here and any help will be greatly appreciated. original complaint was poor driveability on a test drive- when passing. read th crank code and replaced it. code has not returned after many more test drives. performed ckp relearn a...
View
2001 Pontiac Montana 3.4L MIL Lamp on
po102 and p0440 were set 580km after the 02 were changed for mant wonder if it could be rlated or if anyone had other ideas what could be. Trouble codes: p0102 (maf code).
View
1999 Saturn SC2 1.9L Misfire
I am afraid I may look at this to hard. This customer has been to several differant shops including the dealer and keeps getting o different story. Now I am giving him another one. As stated before the injectors amp ramp at 1 amp per injector at the injector i... Trouble codes: PO302 (Cylinder 2 Misfire detected).
View

Fixes & Summaries for GM
Fix/Summary Answers
2003 Buick LeSabre 3.8L engine
Thanks to everyone who responded.After doing a few different tests i found the original ignition module to be faulty,so i replaced with a new one and we have a fix.Thanks again Andy
28
1996 Chevrolet Tahoe 5.7L seat
THANKS to the people that took time to reply to my help reqwest. i did not fix this problem .have checked rechecked and checked all over again of all replyes have done all of them. so iam ending this so some one else can post a problem custermer is going to se...
15
1998 Chevrolet Venture 3.4L No Start
I WOULD LIKE TO THANK EVERYONE WHO HELPED OUT ON THIS ISSUE. I THINK THE NETWORKING BETWEEN TECHNICIANS IS A GREAT HELP FOR EVERYONE. THE PROBLEM WAS A BROKEN CONNECTOR. THE CONNECTOR DIRECTLY TO THE PUMP WAS CORRODED HAD TO REMOVE TANK TO SEE IT WHEN I DISCON... Trouble codes: PO230 (uel control circuit).
10
2001 Chevrolet Malibu 3.1L No Start
well this just shows the power of iatn ... just about all of the replies pointed to the passlock sensor on the ignition cylinder , with odds like that its got to be a pattern failure , so replaced the passlock igniton cylinder and reset the security by leaving...
19
2002 Chevrolet Monte Carlo 3.8L No Start, MIL Lamp on, security light on
WELL GUYS THIS ONE TOOK A LOT OF TRIAL AND ERROR TO REPAIR AND I USED EVERY PIECE OF INPUT I RECIEVED FROM ALL OF YOU. FIRST I REPLACED THE IGNITION KEY TUMBLER AND RESET THE SECURITY SYSTEM. THIS SEEMED LIKE IT FIXED IT FOR ABOUT A WEEK UNTIL THE SECURITY LIG... Trouble codes: U1000 (class2 datalink malfunction), U1064 (lost communication with BCM system), B1004 (kam reset), B1780 (theft lock enabled for radio), P1626 (theft deterent fuel enablesignal lost).
22
2003 Chevrolet Silverado 6.6L No Start, MIL Lamp on
the first thing we did was to clear the codes to see what would return. the po380 came back evertime, so with scanner hooked up we could see the glow plug relay come on, but had no voltage being appiled. after we replaced the glow plug relay there were no more... Trouble codes: u1064 (bcm no data), u1800 (ficm to ecm no data), p1621 (ecm memory), po380 (glow plugs).
4
1995 GMC Suburban 6.5L MIL Lamp on, code 78
First of all I want to thank everybody that replied, there were twomain responces, change the waste gate solinoid and or vacume pump problems. what I did was change the solinoid and also found the fuel filter restricted, so I changed that as well. I really th... Trouble codes: 78 (wastegate solinoid fault).
7
2001 Pontiac Grand Am 2.4L Misfire
Well, I've waited as long as possible and I believe (hope) this vehicle is fixed. All parts in the vehicle now are GM dealer parts. I also replaced the aluminum engine cover to eliminate any mounting/distortion issues and I added an extra ground from the cov... Trouble codes: P0300 (random cylinder misfire).
17
2002 Pontiac Grand Am 3.4L No Start
Thanks to all who responeded.Thank you Mike and Allen,the a/c clutch was the problem causing the 10 amp a/c, bfc fuse under the hood to blow.Replace a/c clutch and car starts okay and no problem with the fuse blowing. Trouble codes: b2965 (b2960-), b2960 (b1374-), b1374 (testing and results).
14
Prev (Also Available: All, Asian, Chrysler, European, Ford, GM.) Next