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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for August 9, 2007
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Open Help Requests for GM
Help Request Answers
1990 Buick Century Limited 3.3L injector pulse VIN: 3G4AL54N2L
Still have no injector pulse. has anyone seen this problem before.Per the alldata flow charts, the crank sensor is bad. But we have replaced it twice. I would appreciate any help you could give me.
1997 Buick Park Avenue Ultra 3.8L Stall VIN: 1G4CU5216V
this car starts and runs great,on cold start - outside temp 70* car runs for about 4 to 10 miles and just shuts off - slide in nuetral twist key and starts right away and will run great for 50+ miles for customer to return from work place.seems to need to sit ...
2002 Buick Century Custom 3.1L MIL Lamp on
Vehicle came in with P0420 Cat effciency code. Checked o2's and found these strange readings. At idle pre cat o2 working fine. Post cat o2 sitting @ .400mv. LTFT -4%. Then when revved to 2500 in park... LTFT goes to -14/-16%. Pre cat o2 still toggles great. Po... Trouble codes: P0420 (Catylitic convertor efficiency)
1989 Cadillac DeVille 4.5L compressor relay VIN: 1G6CD5152K
I have an 89 Cadillac Deville here thats keeps blowing the A/C clutch relay after a few minutes of operation. I replace the compressor, evaporator, and orifice tube due to metal shaving in the system from the old compressor going bad. Also flushed and blew out...
1986 Chevrolet Sprint 1.0L turn signal switch VIN: 1G1MR0858G
in kind of a pickle here guys,customer brought in this throwaway car for complete paint,body,interior,rebuild motor..everything.huge bill.everything came out great till somebodybumped,and broke the turn signal switch.if anyone knows where i can lay my hands on...
1993 Chevrolet Lumina APV 3.1L No Start, Hesitation, Cuts out, Stall, Misfire VIN: 1GNDU06D3P
This one has me puzzled. Came in a no start. Had spark and fuel but crossfiring on crank. Ignition looked new but did the module, cap and rotor anyway. Retimed distributor and ignition wires 'cause they were installed wrong. Still nothing. Noticed bare and sho...
1994 Chevrolet K3500 Cheyenne 6.5L No Start VIN: 1GCHK34F2R
This Vehicle came to us from our local Dieael service shop, as he could not get it started. We do not do much work on diesels here, so I will tell you what I have done, and hopefully you all can guide me to a repair on this one. Before the vehicle came to us, ... Trouble codes: 22 (Accel Pedal Position 1 Circuit Low), 62 (Turbo Boost Sensor Circuit Low)
1995 Chevrolet Monte Carlo LS 3.1L trans VIN: 2G1WW12MXS
thanks in advanced for help i'm not much of a trans guy. this vehicle came in slipping in forward gears when hot. reverse and all other operation normal.forward gears rock solid at cold operation.checked fluid, full no burnt smell, original fluid but normal co...
1998 Chevrolet C1500 Cheyenne 4.3L Hesitation, Cuts out, MIL Lamp on VIN: 1GCEC14WOW
this problem started suddenly i was operating the vehicle at the time it occured. the truck was running great stopped at the 7/11 came out and the vehicle had no power under a load. in park it will accelerate fine once in gear or if you turn the steering it cu... Trouble codes: P1345, U1041, U1192
1998 Chevrolet K1500 Cheyenne 5.7L Misfire VIN: 2GCEK19R4W
well I have another one here guys and gals. came into shop with trans. issues hi miles and tcc p1870 hard shifts. we did a pulse width modulation update and seemed to work good.Customer came back few days later felt like tcc shudder and then signal interrupted... Trouble codes: P0300 (random misfire), P0304 (Misfire cyl 4)
2000 Chevrolet Impala 3.8L No Start, Hesitation, Cuts out, Stall VIN: 2G1WF55K3Y
Here's another 3.8 Impala with a stall problem. Problem has gotten progressively worse over the last year. Customer will be returning the car to me in a couple of days to check it over once again. I'm sure that many of you guys have seen this problem and had t...
2001 Chevrolet Malibu LS 3.1L Instrument cluster VIN: 1G1NE52J41
Vehicle came in for intermittent no start. Found intermittently while cranking vehicle there will be no power to instrument cluster (no RPM, no fuel gauge, no oil pressure, no IC lights) & vehicle will not start. If key is cycled off/on, 9 out of 10 times the ...
2004 Chevrolet Impala 3.4L Misfire VIN: 2G1WF52E64
Hello and thanks in advance for reading this. I have an 04 Impala with a 3.4 that misses at idle and just off idle with no load. This car will not set any misfire codes and won't show any misfire readings at idle however it will record current misfires just of...
2000 GMC Sierra 1500 SL 4.8L Poor Idle Quality, Hesitation, Misfire VIN: IGTEK14V9Y
hello there, thanks in advance for any responses. i have a gmc sierra, 4.8 v8, with missfires on warm up, at idle, have 56-57 lbs of fuel pressure, koeo, misfires are on cyl #2, and #7, only. intermittnely on #8, replaced the fuel pressure regulator, diaghram ... Trouble codes: P0300
2003 GMC Sierra 1500 SLE 5.3L 4wd VIN: 1GTEK19T33
Vehicle came in with service 4wd displayed on dash. Scanned T-case module codes are: C0300, U1026, U1000. need help deciphering codes. Currently MOD Pc is in for repair no access is available. Thank you in advance for assisstance.
1998 Saturn SW2 1.9L Hesitation, Surge VIN: 1G8ZK8271W
Vehicle surges an no power at mid range , Timing is controled by ecm to -48 deg egr goes to 60-80% car runs bad till full throttle, ccp opens fully what controls the negative timing and egr open? Coolant sensor is ok,no clogged cat converter

Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick LeSabre Custom 3.8L 4 gear shift VIN: 1G4HP52L4R
I want to thank all of the members who posted a possable fix for my customer. We decided to replace trasmission as was sugested by most of the members. Car now runs and shifts very good. Agai thank you all. Sorrt this took so long to close but I was on vacatio...
1985 Cadillac Eldorado 4.1L Programmer VIN: 1G6EL5788F
Thanks to all who responded. It turns out that the part number we supplied was wrong. That was a number for the power module...not the programmer. We found no reliable availability for the programmer. We did find a couple of used units, but each had a differen...
1997 Cadillac Seville SLS 4.6L Electronic VIN: 1G6KS52YSV
thanks to all who replied.it turned out the vacuum solenoid(vacuum log)by right kick panel.$96 5 min to install happy customer thanks again
1998 Cadillac Seville STS 4.6L waterpump housing VIN: 1G6KY5493W
Thanks to all the tech's that so quickly replied to my request for advise. With the confidence from your posts we sold and completed the job in book time. Not bad for the first one we ever did. You do have to be patient and just keep taking things apart though...
1991 Chevrolet Astro CL 4.3L Stall, stall after start VIN: 1GNDM19Z2M
Hello everyone, I don't know how i overlooked this one, except when i would have everything connected and doing testing it wouldn't act up. I want to thank everyone for their replies. This ended up being a fuel pump issue that was very intermittent. Vehicle...
1994 Chevrolet Camaro Z28 5.7L No Start VIN: 2G1FP22P8R
stripped out camshaft sprocket some times it would turn the distributor and most the time it wouldnt.
1998 Chevrolet K1500 Suburban 5.7L No blower operation VIN: 1GNFK16ROW
Hi all who had suggestion and experience with this Chevy SUV, and THANK YOU.. Car returned today for repairs. Opened dash and had new module to warranty since circuit board had major signs of heat, soldered in 6 wires in 8 plug connector, GM replacement and al...
2002 Chevrolet Avalanche 2500 8.1L rear main seal VIN: 3GNGC23G82
i took a 7.3l ford dual mass flywheel, [BROKEN OF COURSE],cut it down with a tourch,removed the bearing assy. and was able to use it along with some low and reverse steeles out of a 700r4 to press in the rear main seal. my oe tool should be here soon . thanks ...
2004 Chevrolet Suburban 2500 LS 6.0L Encoder Motor VIN: 1GNGK26U24
please refer to the update for the fix and wiring "oops"
2004 Chevrolet Trailblazer LS 4.2L MIL Lamp on VIN: 1GNDT13S34
Thanks to Dan, Faizal [...] & Cenen for replying to my request. That day I posted the request the vehice had to go, so I havent been able to check the things these guys sent. But good news vehicle hasn't come back! I think by resetting fuel trim level helped... Trouble codes: P1133, P0172.
2004 Chevrolet Silverado 3500 LS 6.6L Poor Idle Quality, Poor Fuel Economy, MIL Lamp on VIN: 1GBJC34214
Thanks to all who posted. Most of you hit the nail on the head. There was a poor connection at #7 injector. If you tested for continuity it showed good. but running it would drop off. Trouble codes: P0207.
1996 GMC K2500 Suburban 7.4L Poor Idle Quality, Hesitation, Surge, Stall, Misfire, MIL Lamp on VIN: 1GKGK26J5V
Many thanks to the guys who took time to reply.Dave from the Land of Cheese,Carl the Buckeye,Bill from Ill.,and Jesse from Kaintucky W.It turned out to be 2 problems.When we looked at the old dist. cap you could see where the rotor button had barely been rubb...
1994 Oldsmobile 88 Royale LS 3.8L Generator VIN: 1G3HY52L4R
I finally got another vehicle in the shop that has the same system. It is correct to have the 2volt drop at the PCM terminal that goes to the 'L' terminal of the alt. THANK YOU FOR ALL YOUR HELP! Even thought no answer was available,I didn't feal like I was cr...
1997 Oldsmobile Achieva S 3.1L rear brakes VIN: 1G3NLYZTWM
Wow!!! What great and accurate responses I received!! I wouldn't trade IATN and you all for 10 million bucks!!! Most of you replied about the hardware and I thought that was a valid start. I wanted to learn here so I suggested the hardware, shoes, and drums bu...
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