× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for October 12, 2007
International Automotive Technicians' Network (iATN) - Members Only
(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
1988 Cadillac DeVille 4.5L fuel gauge VIN: 1G6CD5150J
This vehicle came in with a non functioning fuel gauge. The light blinks E. He had just had the pump replaced at another shop and a body control module. I did notice that the two ground wires on the module are soldered together. I think the blk/pnk and black/w...
1988 Cadillac Eldorado 4.5L Excessive Emissions VIN: 1G6EL1157J
This is a state smog car, so I have no history. She's a 4.5L with TBI. But it's got me running in circles. The exhaust readings posted are the ASM 20/25 results. I replaced the O2 sensor & Air check valve at the cat and the exhaust readings changed dramaticall... Trouble codes: 44 (Lean exhaust)
1997 Cadillac Seville SLS 4.6L fuel gauge VIN: 1G6KS52Y0V
OK Fellow tech's I have this Cadillac STS in my shop with a gas gauge that reads empty with key off.When you turn the key on it slowly rises to full "not over full" and stops. never changes no matter how much fuel in in the tank.I have scanned the PZM and ther...
2000 Cadillac Eldorado ETC 4.6L 1-2 shift VIN: 1G6ET1299Y
replaced orig. trans with used unit. code came with used unit. preformed tsb.#-1-07-30-009b no help. i,m not a trans tech. any help would help. joe fannin
1990 Chevrolet K2500 Cheyenne 5.7L Excessive Emissions VIN: 2GCFK29K1L
Truck failed emission ,hc was 923 at 2480 rpm and 259 at idle with limit of 220 ppm. I replaced spark plugs, fuel filter and oxygen sensor, checked resistance of plug wires,cap and rotor look good,reset timing to 0deg with timing connector disconnected,timing ...
1992 Chevrolet K1500 Cheyenne 5.7L Hesitation, Misfire VIN: 1GCEK14K9N
The truck has a hesitation/misfire when in drive, just off idle, at 750-900 rpm. Scoped the primary and secondary igntion circtuits, all waveforms ok. Fuel pressure and volume are both in spec, injector waveforms look good, and spray pattern looks ok. Timing i...
1998 Chevrolet Malibu LS 3.1L radio VIN: 1G1NE52M6W
I interupted power to the radio and now am locked out. Would it be possible for someone to get me the code to unlock it? The codes from the radio are 162 and 168. Thanks in advance Jim
2000 Chevrolet K2500 5.7L Carrier Bearing VIN: 1GCGK23R3Y
The vehicle is driving down the road and will all the sudden start vibrating and shaking real bad. When we check it, the rubber that supports the bearing in the carrier assy is missing. So we check the driveshaft and the mount and u-joints and replace the carr...
2000 Chevrolet Silverado 1500 4.3L Excessive Emissions, Hesitation, Stall, Poor Fuel Economy VIN: W1YE278955
Being a Dodge tech, I'm stumped. Truck came in for rough running, stalls on accel, has very "ripe exhaust" and very low fuel economy. After repairs, rough idle is gone, but all other problems still exist. Problems occur more frequently when cold and seem to me...
2001 Chevrolet Lumina 3.1L abs system VIN: 2G1WL52J21
This car came in with the front abs coming on any time you hit the brakes above 14 m.p.h. I can watch the data on my scanner and everything is perfect. You can see the computer commanding the front abs to come on.
2001 Chevrolet Astro LS 4.3L transfer case VIN: 1GNEL19W11
We have a vibration when turning. transfer case was replaced at customers request based on other shops diagnosis. vibration is not there in reverse and does seem to come and go in drive. mostly when accelerating and turning. suspect encoder motor keeping front...
2001 Chevrolet Impala 3.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: 2G1WF55K81
Help me GM Guys. I have two of these 01 Impala's doing the same thing. At idle I have misfires in cyl#3 on one car & cyl#4 on the other. It's center cylinders on both cars. At idle both cars run Terrible & show misfires constantly. As soon as I step on the gas... Trouble codes: 0300B
2001 Chevrolet Cavalier 2.2L pcm VIN: 1G1JC12471
to all gm tech: i have 2001 chevy cavalier, it was a no start, due to the ground cable (body, bolted to the battery tray) broken & lock cylinder assembly malfunction. i am trying to access data to the ecm from my "red brick". but "no communication" (engine ...
2003 Chevrolet Silverado 1500 5.3L tcc lockup VIN: 2GCEC19T53
Goes in and out of lockup at 48 to 52 mph. With modis hooked up, we can engauge lockup, does not do it. Checked brake switch-good, checked grounds-good, seems to be temp related, only does it when at operating temp., can't see anything out of range on scan in ...
2004 Chevrolet Trailblazer LS 4.2L low beam headlights VIN: 1GNDS13S54
gm techs, need help please. thanks in advance. low beam headlights not working. have good power and ground to hdm / low beam relay. have tested headlight switch - it is sending good ground input to bcm. scanner shows bcm is commanding headlights on 100% duty c...
1994 GMC C3500 HD 6.5L Hesitation, no power VIN: 1GDJC34F4F
hi everyone, i have this 6.5l desiel that had a missfire all the time in the shop. using mastertech i performed an injector bal. test and found cyl. #1, #8 not working, so i removes glow plugs and did a compression test on those two cyl. i had aprox. 350psi. s...
2000 GMC Sierra 1500 SL 5.3L Cuts out, hard start VIN: 1GYEK19TXY
This GMC pickup first died on the highway and when the fuel pump was changed we saw the typical Autowrecker writing on the pump, so someone already began this battle.We now have intermit. hard start and fuel pressure is low. Specs call for 55-61 and 3 AC Delco...
2005 GMC Sierra 2500 HD SLE 6.6L Trans temp VIN: 1GTHK29215
Thanks in advance for any help or tips guys, got a customer with this truck he has owned since new. He noted that in the past two weeks, the trans temp has been running up to 200 instead of the 150 he's used to and oddly enough the temp outside is getting cool...
1999 Oldsmobile Silhouette Premiere 3.4L abs and tcs VIN: 1GHDX03E2X
This vehicle is getting to me. It came in with a code for the right front wheel speed sensor, checked the sensor, the pigtail was broken right off. Replaced the hub assembly with abs sensor, cleared codes. Started vehicle a few minutes later the abs and tcs li...
1988 Pontiac Sunbird SE 2.0L Hesitation, Poor Fuel Economy VIN: 1G2JD11K2J
Hi: Fuel Pressure fluctuates rapidly about 4 needle swings/second, yet always stays within 9-13 psi range. It never goes below min or above max. When I actuated test connector the initial pressure rises quickly to 11 psi, stays there for 3 seconds, then start...
1994 Pontiac Bonneville SSE 3.8L No Start VIN: 1G2HZ5218R
Been having a problem figureing this one out. We have spark and fuel pressure but we have no noid light. So I suspected the computer checked all the powers and grounds and they are all good. Also I cannot communicate with the computer at all but with other mod...
1995 Pontiac Trans Sport 3.8L poor power VIN: 1GMDV06L8S
This Transport has poor power from a standing start. Has fresh plugs and wires. Fuel filter is new. New Delco pump and strainer. Exhaust system has been checked for back pressure. (OK) Fuel pressure, key on-pump running 41psi.Spec says it should be 41-47psi. A...

Fixes & Summaries for GM
Fix/Summary Answers
1997 Cadillac Seville SLS 4.6L High Idle VIN: 1G6K552Y6V
I want to thank everyone for their ideas on my Cadillac. Most of the items you suggested we have already checked and rechecked. Once we came to the end of our rope we decided to reflash the computer. Once this happen the concern went away. We all must remember...
1994 Chevrolet K2500 Cheyenne 6.5L Cuts out VIN: 1GCFK29S8R
thanks for the help ,installed new pmd and truck is fixed thanks again .this is not the first pmd this truck has killed in 200k miles but it would be nice if it was the last.thanks again.
1997 Chevrolet Blazer 4.3L No Start VIN: 1GNDT13W2V
found out be a faulty fuel filter, customer had just installed one last week, filter was installed correctly but upon cutting it open, you could see where the filter had came apart inside, limiting flow
2003 Hummer H2 6.0L Hesitation VIN: 5GRGN23U63
After everyones' great advice we found out that the customer had installed some type of aftermarket tuning device, that he failed to mention in the first place. Upon removal of this tuner the truck runs and starts great. He purchased a new tuner we installed a... Trouble codes: P0300.
2000 Oldsmobile Alero GL 2.4L Poor Idle Quality VIN: 1G3NL12TXY
The fix for this car was a new computer. I tried all the suggestions everyone had(cleaned T/body, test for vac leaks, holding the throttle slightly open at key on), but this PCM just would not learn. After installing the new PCM and having it flash programmed ...
Prev (Also Available: All, Asian, Chrysler, European, Ford, GM.) Next