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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for July 12, 2005
International Automotive Technicians' Network (iATN) - Members Only
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Open Help Requests for GM
Help Request Answers
1999 Cadillac Seville SLS 4.6L temp of left side
Hello fellow wrenches,I have a 99 cadillac STS with a dual zone problem. There is a temperature difference between the the right and left side ducts, all the blend door motors have full travel, even removed them and tried manually moving, no change. No codes w...
1963 Chevrolet corvette 327CID carburetor VIN: 30837G1159
I just got this car back car back on the road. The engine is a fuelie block, GM fuelie pistons fuelie heads 2.02 intake, 30-30 Duntov cam, soild lifters, Edelbock TM1 dual plane manifold. Holley dual-feed dual pumper mechanical secondary 650cfm (I think). List...
1965 Chevrolet vette 327CID cooling fan VIN: 194375S120
On days where temp. exceeds 80 deg. if a/c is on temp. will climb to 230 deg. at slower road speeds, 0- 45 mph. Within a few minutes at higher road speeds the temp slowly drops to normal, about 180 deg. Fan clutch was just replaced with a new GM unit, no chang...
1984 Chevrolet K5 Blazer Custom 5.7L Excessive Emissions VIN: 1G8EK18L7E
Help I have this K-5 full size Blazer in the shop and it is failing the emissions test for NOX. I replaced a known bad TPS to no avail. My problem is I dont have the proper wiring diagram. The EGR solenoid is never being commanded to pass vacuum. Even with the...
1987 Chevrolet R30 Custom Deluxe 7.4L No Start VIN: 1GCHR33NXH
hello-hopefully a chevy guy will pick this one up-this thing will blow the ecm fuse when trying to start-wondering if there is a common problem in the wiring or component that would cause this to happen-7.4l-dualley-tbi-injection-- thanx brian.
1989 Chevrolet C1500 Cheyenne 5.7L shift timing
Transmission has late shifts. As in 1-2 shift @35 light throttle. 45 0n the 1-2 at heavy throttle. Even with the t.v. cable unhooked, same shift points. Light throttle 2-3 shift is around 45 and 3-4 around 55mph. I have removed pan and checked t.v. bracket for...
1996 Chevrolet S10 LS 2.2L 5th gear VIN: 1GCCS1947T
this s-10 came in with complant of popping out of 5th gear when you let off of acel and coast in 5th. i removed trans and dissassembled it an found a bad 5th gear,syncro,and blocker ring.i replaced all and put trans back into truck but it still poped out of 5t...
1998 Chevrolet Express 3500 5.7L No Start
ive never found one of these with a bad cam sensor went ahead and replaced it anyway no luck wondering if theres a problem with wireing or computer problems on these i usually work on fords this has stumped me just trying do do a favor for a friend anyone got ...
1998 Chevrolet Blazer 4.3L hydralic system VIN: 1GNCT18W8W
caped of lines couldn't get a good pedal so i've installed a new master cyl. can get small stream out of both rear calipers. go to right front nothing comes out not evan air seams like driver side can get alittle fluid. have treid for a while went to the abs u...
1999 Chevrolet K1500 Suburban 5.7L Differential VIN: 3GNFK16R9X
there is a loud rattling noise I hear when accelerating from stop intermitten when turning (sounds like metal shield vibrating)the brakes had been done and drums not turned so I turned them, with no change(this is that lsd diff. one piece with governor)I read ...
1999 Chevrolet Blazer 4.3L Hesitation, Surge, Cuts out
OK Techs, Here we go. This was brought to us for lack of power. Test drove to verify. NO Power. This thing starts and idles GREAT! You take it out on the road, it acts like the exhaust is partially plugged. No Codes. Every reading on the scan tool is perfect t...
2000 Chevrolet Silverado 1500 5.3L Stall, PCM Fuse VIN: 2GCEC19VXY
I really do not know where to start to look. Pcm fuse2 blows customer stated. Vehicle came in with 30 amp fuse replacing 20 amp. Just want to know if anyone has seen this problem before. Checked grounds. When fuse blows, eliminates any possible codes. Thanks f...
2002 Chevrolet Trailblazer LS 4.2L ac system VIN: 1GNDT13562
This is a strange one. It is making a clacking noise, coming from behind the raido, sounds like a plastic gear that is stuck. You sometimes hear 6 or 7 clacks in a row then it stops this only happens when the key is turned on.The noise never comes back after t...
1991 GMC Pickup K1500 5.0L Poor Idle Quality, Stall, Misfire
After engine replacement truck has poor idle quality,misfire at times and stall at times. Truck runs O.K. during road test at speed. Runs rough at idle. I have replaced distributor shaft due to cracks in magnet,coolant temp sensor for corroded terminals,spark ...
1998 GMC Safari SLE 4.3L 2nd to 3rd shift VIN: 1GKDM19W8W
HELP!!! I serviced the trans on my wifes van (new filter and fluid) and now the thing is shifting hard. I don't do trans work so I don't have the test equipment to give you a lot of info on pressures and such. After this van is hot this thing will shift so har...
1999 Oldsmobile Intrigue GX 3.8L No Start VIN: 1G3WH52K7X
Howdy folks, It's back! Had this one in 2 weeks ago for a "no crank" and intermittent blinking security light. Diagnosed as bad key, cust used spare key and no codes no problem. Now it intermittently "cranks" but wont start, during the failure to start you can... Trouble codes: B2961 (incorrect key data), B2602 (unknown)
1996 Pontiac Grand Am SE 3.1L Alternator VIN: 1G2NE52MXT
Greetings everyone. I am having trouble with a charging system on this vehicle. The car was just purchased and towed into my shop with dead battery. Suspicious right away, because car has new battery and alternator. Upon examination, I found someone had rewire...
1998 Pontiac Grand Prix GT 3.8L HVAC Blower and automatic headlamps VIN: 1G2WP52K3W
Hi all. Have a strange problem w/ HVAC blower operation. At first it was intermittent not working on all speeds but high. Now it is consistant. Figured it was the blower motor resistor, but not the case. Recently noticed that when Fan control is set to any spe...
1997 Saturn SC2 1.9L tcc lockup VIN: 1G87H1274V
Code set & tcc becomes inop. The problem being is that trans & tcc shift well while tran temperature is below approx 145 deg. After higher temp pcm sees too much slip & it disables tcc. I inspected & tested actuators while hot & the test good. Replaced the tcc...

Fixes & Summaries for GM
Fix/Summary Answers
1950 Buick roadmaster 229CID master cylinder VIN: 0075873511
Hi and Thanks to all who replied.We Checked the free play in the rod and that was ok.we checked to see if lines were near any exhaust pipes and that was ok,we then pumped the pedal untill the brakes locked up again.We then loosened the brake line coming out of...
1986 Buick Regal 3.8L Suspension
Thanks guys for all the replies. As I said this is my own personal car so when I get time I will re-align it and check all the things y'all mentioned. Thanks a lot
1996 Chevrolet Express 1500 5.0L No Start, Cuts out, Stall, Misfire VIN: 1GDFG15M4T
thanks to those who tried to help. a special thanks to jeff from illinois, it was the oil pressure sender that would intermittently send a bad signal. came in monday morning and it fired right up only to not start again after that, so we checked the sender and...
1997 Chevrolet C2500 Cheyenne 6.5L drive line VIN: 1GCGC24F6V
IATN members,well we only received three responses, so apparantly this is not a commom problem. So far we haven't fixed the jerking. We tried the three suggestions and were not successful. We sent the truck and the Deputy to the dealership with the trailer and...
2001 Chevrolet Express 2500 5.0L vents VIN: LHOHOHOHOH
thanks for all the help turned out to be a pencil stuck in the door i hate pencils. sorry getting back so late been slamed with work
1992 GMC K1500 Suburban SLE 5.7L Poor Idle Quality, Surge VIN: 1GKFK16KXN
Thanks for all the responses. I checked the tps and it was at 49v at idle and i blocked off the iac air inlet at the tbi and the idle lowerd so it was the ecm causing the issue. the iac count were 0 . I replaced the ecm and prom and it relearned the idle speed...
1999 GMC Sonoma SL 4.3L Surge, Poor Fuel Economy VIN: 1GTCT14W1X
Well the truck is not fixed. I worked on it long enough the man said time to trade it in. I reset the cam retard, relearn the crank ref., clean egr ports and valve, clean injectors, O2 were switch good so I did not change them, the next thing I was going to do... Trouble codes: P0410.
1996 Pontiac Bonneville SE 3.8L Air distributor VIN: 1G2HX52K6T
I got 6 replies on this one. Most of them for things that I had already checked. But Larry [...] hit the nail on the head. The old programmer had soft rubber vacuum ports and were larger than the new programmer. So the vacuum harness was fitting too loose on th...
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