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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for October 19, 2005
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Open Help Requests for GM
Help Request Answers
1995 Buick Park Avenue 3.8L No Start, Cuts out, MIL Lamp on VIN: 1G4CW52K3S
This car came in with three historical codes. I am at home typing this so I donít have the numbers so I listed the codes. After sitting a while, then restarting and driving down the road sometimes this car will cut out on acceleration. Twice on deceleration th...
1996 Buick Regal Gran Sport 3.8L engine VIN: 2G4WF52K1T
Hello; I have a 3800 series II making some strange sounds.loud tapping sound,loudest at the front of the plastic intake runners.Very loud at start up, settles down a bit then stays continuious. Customer states it made noise 1 day, noise went away, drove the ca...
1995 Cadillac Eldorado ETC 4.6L Blower Motor VIN: 1G6ET1299S
Have no blower speeds. Following Alldata information--Key on and entered on board diag. Selected acp override as16 (blower speed). Override blower speed from 99 to 0 noting speed changes as number decreases. Still have no blower speed at all even in override. ...
1968 Chevrolet Camaro 5.7L Excessive Emissions, Poor Idle Quality, Surge, Stall VIN: 123378N408
Hello Everyone, This one is a bit concerning for me. This 1968 Camaro has had a newer '93 Corvette LT1 installed in it... but not by me. The whole job is a bit sloppy, but the customer swears it used to run much better, though it had a random miss from time t...
1995 Chevrolet Lumina LS 3.1L 1st Gear & Overdrive VIN: 2G1WN52MXS
I Would Appreciate Any Help, This Car After We Put The Used Transmission In Does Not Have 1st Gear, Overdrive, Manual 1st. I Have Checked Shifter Cabel Adjustment, All Checks Well. With Scanner Hooked Up, Computer Readings are Right. Computer Is Saying 1st Gea...
1996 Chevrolet Astro 4.3L High Idle VIN: 1GNDM19W7T
This IAC will retract all the way but it will not extend?? Is this a PCM problem?? The idle is about 3000 rpm unless I manually extend the IAC and let it unplugged. If I try to control the IAC with the scanner it will only retract no matter which way I command... Trouble codes: P1509 (IAC System High Rpm)
1996 Chevrolet S10 LS 2.2L limp mode with no codes VIN: 1GCCS1945T
This truck acts like the perfect candidate for TSB 66-71-03 The only problem being that with the 4 cyl. engine it uses a completely different ECM. This one has 3 plugs vs 4 ,with totally different colors, and each already has a ground. The truck probably needs...
1997 Chevrolet K1500 Cheyenne 5.7L Poor Idle Quality, Cuts out, Poor Fuel Economy VIN: 2GCEK19R8V
Hello guys & gal, this is a truck that I have been working with for years as it is a close friend & customer of mine. He claims that it is losing power, probably due to the miles, but because it had been over a 100000 miles since his last tune he wanted to tun...
1998 Chevrolet C1500 Cheyenne 5.7L hard start VIN: 2GCEC19R8W
hello group TRUCK came in on hook,,,it will start and run,but after it gets to normal operating temp, u turn it off and it hard to start,it sounds like its dontonating on start up.fuel pressure is in spec,checked tdc with piston up ,rotor at number one cly. i...
2000 Chevrolet Impala 3.4L 1-2 shift VIN: 2G1WF55E7Y
Hi all. Just overhauled a 4T65E. Everything is Ok except light throttle 1-2 shift shutter. Medium/Hard throttle you cannot feel it. Have read some problems with 4T60E valvebodies that would cause this but not really sure if they are the same. Trans was overhau...
2001 Chevrolet Suburban 1500 5.3L Poor Idle Quality, MIL Lamp on, no throttle response VIN: 3GNEC16TX1
vehicle is very hard to start at times when engine is cold. when it does start it has no power. seems to be better after warm up. checked all fuses and relays o k also noticed when problem happens "traction off" light is on and "reduced power" light is on this... Trouble codes: P1518
2002 Chevrolet Monte Carlo SS 3.8L MIL Lamp on VIN: 2G1WX15K72
This Car is out of warrenty by time, Did the air Pump Update, car went 500 miles & light came on again. I rear on IATN that this car is know for the converters being bad. Customer even got a letter. Sent car to the Chevy Dealer & They tried to sell her the air... Trouble codes: P0410
1997 GMC K1500 Sierra SL 4.3L Cuts out, Misfire, MIL Lamp on VIN: 1GTEK19W0V
I need some help on this one. This truck came in to the shop with check engine light on and fuel pump screaming. I told customer we have to fix the obvious noisey fuel pump first, which we did with an AC Delco pump and new fuel filter. Cleared codes to aid fur... Trouble codes: P0300 (Random cyl. misfire detected), P0151 (O2 signal low bank 2 sensor 1), P0137 (O2 signal low bank1 sensor 2), P0131 (O2 signal low bank 1 sensor 1)
2000 GMC Savana 3500 5.7L 3 rd gear VIN: 1GDHG31R3Y
When you step down real hard (Fleet Vehicle Hard) it won't shift up. If you let off just a bit it will shift fine. We replaced the throttle cable because it had a bad spot starting in it after that the customer complained off the transmission not upshifting or...

Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick LeSabre Custom 3.8L hvac VIN: IG4HR52L9R
replace passenger side temperature door actuator thanks to all that replied ! very good information
1996 Buick Regal 3.8L cooling fans
the epair for the ac cooling fans. was the comp.was damaged internaly.replaced the ac comp.and the orice tube.repr.the pcm.
1990 Cadillac DeVille 4.5L Stall VIN: 1G6CD5331L
I checked ECM fuse 17 under LH dash, OK. Fuse terminal condition and wire connections OK.I cleaned grounds at starter, LH fender, alt. Could not find any grounds at firewall, or trans. Cleaned battery positive junction post at center firewall. Cleaned battery ... Trouble codes: E52 (ECM Memory reset), F32 (BCM-ECM Data Problem).
1997 Cadillac Seville SLS 4.6L Stall VIN: 1G6CS52Y6V
Well guys here it is, frist thanks for the help. Most of you stated that the Cranksensors were my problem! Well I replaced both cranksensors with updated ones, drove car all weekend long and stalling condition has not happen again. I belive must of you were ri...
1998 Cadillac DeVille 4.6L Starting VIN: 1G6KD54Y3W
Thanks to all for your help. We did try a new battery no change checked for voltage drop on all battery cables found a 5 volt drop on the 4 gage power cable from battery to power dist. center under the hood this was not powering up fuel pump& ecm while crankin...
1985 Chevrolet K10 Scottsdale 5.0L Hesitation, Loss of power VIN: 2GCEK14HXF
Thanks as always guys, the first responder nailed this one, Craig from TX. These guys nailed it as well, Kevin-SC, Rick-OH, and Steven-TN. It appears that the electronic spark controller was indeed the problem. After reading the posts I vagely remembered somet...
1994 Chevrolet Lumina 3.4L Turn signal flasher
Thanks for all of the replies!! Most of you were on the money with turn signal switch being the culprit. The turn signal flasher had been previously from the clip, but is still to the right of the steering column. Thanks for the information about the brake lig...
1995 Chevrolet Lumina 3.4L timing chain
well i had alot of responses. as most of you said,i haven't seen a timing chain on these bust.but after pulling the front cover off and looking there it is.done belts on these before but this is a first.oh well i guess you always look forward to something new....
1996 Chevrolet K1500 Cheyenne 5.7L pump or box VIN: 1GCEK19R9T
Thanks for all your help A new pump fixed the problem It took a few days to find out from the customer Thanks again for all the help
2000 Chevrolet Suburban 1500 LT 5.3L Electronic VIN: 3GNFK16T6Y
Well this is in the done files and fixed. I had about 10 replys that all said about the same,Bad rear exp valve. The biggest pain was to get the box out and open to install the new valve. My parts man said that it was a new design part. We found compressor met...
2001 Chevrolet Express 3500 5.7L #3 fues blows immediatly VIN: 1GAHG39R81
Thanks to all, I forgot my basics on this one, and I'm not ashamed to admit it. I was looking for shorts and forgot the fundametals. Any way this crtsy circuit is all by it self on this van. Cig. lighter,under hood light are on seperate circuits. The problem w...
2002 Chevrolet Impala LS 3.8L No Start, Poor Idle Quality, Stall VIN: 2G1WH55K92
Had 5 posts for iac. I had removed and cleaned but made no differance. Replaced iac and started and ran perfect . Thanks for all your help. Sometimes you need to post to get you mind staight
2004 Chevrolet Silverado 3500 LT 6.6L tcc VIN: 1GCJK33214
The customer is in 'stall mode.' He still seems to think his Allison should handle all the torque 'since no one else has this problem'. Jerry [...] sent that a former GM trans engineer told him the Allison is designed to handle @450 lbs/ft of torque, and tha...
1999 GMC C1500 Suburban 5.7L No Start, Starts then dies VIN: 3GKEC16R8X
...Theft Module...Part #[...] Hello, Sorry about the long open time. I needed to make sure that my very intermitant problem was indeed fixed. Thanks to everyone who sent a reply. Most replys told me to replace the ignition lock case with the magnetic sensor... Trouble codes: P1626.
2002 Pontiac Sunfire SE 2.2L No Start VIN: 1G2JB12452
5 replys said ign switch was most likely the problem. Some mentioned a TSB or recall, but I didn't see one in mitchel. Since three days in a row in wouldn't act up again customer wanted car to try out. Another money maker! Trouble codes: U1000 (Loss of serial comm class 2), P1626 (Theft deterant start fuel signal not recieved), B2707 (Gear shift unlock circuit low input), B2958 (Security system sensor data circuit hi), U1088 (u1096-), U1096.
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