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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for March 14, 2006
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2004 Buick Rendezvous CX 3.4L speedometer going over 180 KPH and staying there VIN: 3G5DA03E54
Hi people. I have got this Rendezvous that intermittedly the speedo will go right to 180 KPH while driving and stay there. If you shut off the ignition and wait one moment and then turn on ignition speedo will come down by say 20 KPH. Keep doing this and it wi...
1989 Chevrolet R3500 Cheyenne 5.7L Cuts out, Misfire VIN: 1GBHR34K9K
truck will pop out tbi when gone 20 miles or so when leaning on it, let off runs fine. idle is good and all readings on scanner are fine. changed tps, o2, est mod, dist, cleaned grounds, [all there also] egr, checked all plug wires one by one to no avail. swap...
1992 Chevrolet S10 Blazer Sport 4.3L No Start, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall VIN: 1GNDT13W4N
blazer came in with complaint of hard start and stalling at stops. found code 32, but while monitoring data with engine idling des. egr was 80% while actual egr position was 45%. shut engine down and deired egr was at 40% and actual was 44%. I've read through ... Trouble codes: 32 (egr problem)
1993 Chevrolet C1500 Cheyenne 4.3L Cuts out, Stall VIN: 1GCEG14Z4R
truck runs good cuts out restarts right away
1995 Chevrolet Astro CL 4.3L No Start, Cuts out VIN: 1GNDM19W2S
this one is a little tricky.this van came in for stalling while in motion as if someone turned off key.it is NOT losing spark nor fuel pressure, something is cutting the injector out or something in the csfi, if i spray ether in intake just as it is about to d...
1997 Chevrolet Cavalier LS 2.4L Misfire VIN: 4G1JF32T1V
Here's the deal customer brought us this 97 cavalier they had just purchased. It was running bad and check engine light was on. I scanned it to find the above codes... first thing I found was a broken vacuum hose to the MAP sensor. I repaired it cleared the co... Trouble codes: P0300, P0172, P0106
1997 Chevrolet K1500 5.7L convertor VIN: 2GCEKI9M4V
Hey guys, been having a tranny problem about 6 months now, {this is my own truck so it gets put on the back burner} I am having a tcc lockup problem, works great cold, problem begains when trans is at operating temp. Sets PO1870 and shifts hard due to increase...
1998 Chevrolet Cavalier 2.2L Poor Idle Quality, Stall, Misfire, MIL Lamp on VIN: 1G1JC5245W
this car came to shop with a running rough @ idle complaint. opened & closed egr using active commands with scan tool and could make car run reasonable. data stream on scan tool however still indicated egr position to be at 26% while desired egr was 0%. tapped... Trouble codes: P0404 (egr valve pintle position open), P1404 (egr valve closed pintle position)
1998 Chevrolet Cavalier Z24 2.4L engine cranks but will not run VIN: 3G1JF12T6W
The first thing I checked for was spark and fuel pressure. Found no spark but fuel pressure within specs. Then checked for codes . Present PO 335 CKP sensor PO 341 CMP sensor. History codes, P1629 theft deterrent crank signal malfunction, B 1011 VTD short this...
1999 Chevrolet Silverado 1500 5.3L serpentine belt VIN: 2GCEK19T3X
The ac compressor belt comes off. Low and high pressure ok no fluctuation in reading like compressor staring to freeze up. We've replaced the tensioner.It dosen't happen right away the system works fine and then driver comes in for regular maintennace and says...
2000 Chevrolet Cavalier Z24 2.4L rapping noise VIN: 1G1JF12T6Y
Hi All, This vehicle came in with a rapping noise under acceleration, which gets quieter in higher gears, and dissapears during shifting. I have iscolated with an electroinc stethascope the noise down to the chain area of the trans. The noise is not present wh...
2000 Chevrolet S10 4.3L Unknown VIN: 0125401254
im a ford tech need technical information on heater core replacement for a 2000 chev s-10 with a/c 4.3 v6 engine .
2001 Chevrolet Impala 3.4L No Start VIN: 2G1WF52E41
This car came in about a month ago with an intermittent no start. When it acts up, it loses spark and injector pulse. Fuel pressure is fine. I checked the signals from the 2 Crank sensors and they look fine. But the signal from the ignition module to the pcm i...
2002 Chevrolet Suburban 1500 LS 5.3L transfer case VIN: 3GNFK16TX3
Chevy pros, I need your help. We have a 2002 k1500 Suburban that only generates a C0327 code during a long drive (150 miles non stop at about 50-70 mph). Never happens around town. As customer was leaving, (will drop off friday for diagnosis and repair), he sa...
2003 Chevrolet Silverado 2500 HD 6.6L No Start VIN: 1GCHK23103
no start cold/after sitting over night,no fuel pressure in primer/filter assembly, after priming fuel system (alot),it may start, temperature outside was below [...], has to be brought into shop for a couple hours at 70 degrees to get to start, after new f...
2003 Chevrolet Trailblazer North Face 4.2L body vibration VIN: 1GNET16S63
hello fellow techs, looking for a little help on this one. this 03 trailblazer has a very heavy vibration just off idle. feels like exhaust or a/c hose, etc. contacting body. with rpm's between 630 and 650. it doesn't seem to matter if its in drive, nuetral or...
2004 Chevrolet Silverado 2500 6.0L tach and gauges VIN: 1GCHK29U94
Hello all got a strange one customer states that at times the tach. will stick at max. and will not return for a day or two. fuel gauge acts up at times and oil gauge will drop down to zero. I have replaced the oil sending unit with up date from dealer gauge w...
1997 GMC Yukon SLE 5.7L Surge, Misfire, MIL Lamp on VIN: 1GKEK13R9V
I have this yukon that has a rendom misfire under light load. I can feal real good in 3rd at 60mph. It'll do it in 4th also just not as bad and at 68mph. I have replaced upper intake gaskets, rechecked cap and rotor and pulled all the plugs and replaced the wi... Trouble codes: P0300
2003 GMC Yukon XL 1500 SLE 5.3L A/C Vent Mode Door VIN: 3GKEC16Z43
Replaced battery on this Yukon. Application called for a 78 group batt, opt 75. I had the 75 so I installed it. Cust states since I replaced batt the A/C only blows out the defrost. Switching to manual operation does not change the condition. I replaced HVAC m...
1996 Oldsmobile LSS 3.8L Stall VIN: 1G3HY52LR4
High all in IATN land. This car came to me from another shop where the cam and crank sensors were replaced. It did have a cam sensor code in it when it arrived, but has not returned. I have lab scoped all circuits at the ignition module and all are ok at this ... Trouble codes: B1021 (TFE Malfuntion)
1997 Oldsmobile Achieva S 2.4L Excessive Emissions, Hesitation, Surge, Cuts out, Misfire, MIL Lamp on VIN: 1G3NL52Y9V
When the car idls for 5 minutes it misfires and gallops like crazy. If rpms are held at 3500 it gallops and bucs and jumps like crazy also. Tuned up complete! Can not semm to find a vaccum leak with a smoke machine, absolutly nothing seems to work. Trouble codes: P0300
2001 Oldsmobile Aurora 3.5L fuel gauge VIN: 1G3GR64H11
Have 2 problems 1st the aux emissions air pump failure 1st 1 lasted 9 months when it quit blows 50amp fuse, the 2nd 1 lasted 1 month just went open, dont see a reason for them to quit. also at times the fuel gauge will drop to empty low fuel light comes on and...
1999 Pontiac Grand Am SE 3.4L dash trac light VIN: 1G2NE52E8X
this car has the "trac off" and "security" light going on and off, it seems to be "bump" related, as i hit a bump in the road condition occurs. also if you smack the top of the dash problem occurs. theory; wire damage in dash. is this a know problem, has any o...
1999 Pontiac Firebird 3.8L No Start, Poor Idle Quality, Cuts out, MIL Lamp on VIN: 2G2FS22K8X
vehicle towed in for no start,checked basics,spark fuel,fuses,etc...service computer stated to hook scan tool and test app sensor 3 for .5-1.3v-no voltage indicated.referred to replace tac module.after replacement same symptoms occur.have tested in detail map,... Trouble codes: P0171 (fuel sym to lean bank 1), P0174 (fuel sym to lean bank 2), P1336 (ckp sym variation not learned), P1514 (airflow to tps correlation to high), P1106 (map sensor ckt intermittent high)

Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick Skylark Custom 2.3L No Start, flickering MIL/PRNDL VIN: 1G4NV553XR
Sorry to be so long responding with the fix! I had to be sure the car was. gary [...]. was 1st out of the chute; [...]., airauto; ALL knew what was going on. After I got to the wiring under the air intake boot, a little sleuething uncov... Trouble codes: XXX (data stream inaccessable), XXX (data stream inaccessable).
1997 Cadillac Eldorado 4.6L Poor Idle Quality, MIL Lamp on VIN: 1G6EL12Y1V
sorry for the delay.i informed my customer that her pcm was in need of replacement and is going to bring back to dealership where she bought it.i have not yet heard back from her,as soon as i do will follow up.thank you for all the replies most had responded w... Trouble codes: P0340.
1973 Chevrolet elcamino 5.7L heater core
lots of good replies, I ended up pulling the whole dash to access one of the metal tabs holding the defrost ducts to the bulkhead, looked like box would not come off without ducts off also. the things that went wrong on this one were that it looks like the a/c...
1988 Chevrolet Astro 4.3L Poor Idle Quality, Hesitation, Cuts out VIN: 1GNDM1527J
Hey Guys Thank you for all the replies, It really gets the brain working. a couple of replies said to look at the injectors and i did. I had them rebuilt but that didn't take care of the problem i was having, A couple of replies said to look at the throttle bo...
1992 Chevrolet S10 Blazer 4.3L module VIN: 1GKDT13WGN
well...this one has me stumped...got 8 replies...four were confused about what kind of module I was talking about, one said replace the transfer case and reflash the ecm ( gm wasn't flashing this platform in 92), one said check tire sizes and speed sensors, on...
1998 Chevrolet Venture 3.4L bcm? VIN: 1GNDU06E9W
Well, It turned out to be 4 wires shorted, burnt, arcing back by the Sliding Door Controls (R/R Wheelwell area). We had decided to disconnect the 'Sliding Door Module' to see if all else would go back to normal. After repairing this harness, not only will the ...
1999 GMC K1500 Suburban SLE 5.7L Poor Idle Quality, MIL Lamp on VIN: 3GKFK16R3X
Thanks for all the replies. We pulled the pcv and breather hose off to determine internal vac leak and noticed vac internal so we tore the intake manifold off and low and behold the gasket on the #5 cylinder had slipped down. Runs like a top again and customer...
1992 Oldsmobile 88 Royale LS 3.8L oil pressure VIN: 1G3HY53L1N
hi, thanks for the responses,first we tried the thicker oil but the pressure dropped after 10-15 miles.then we dropped the pan and did find some debris on the screen but that still did not help much. we are now putting a used motor in ( has 100k on it,only cos...
1995 Oldsmobile Cutlass Supreme 3.1L Cooling Systems VIN: 1G3WH52M35
This vehicle has 2 bleeders and I used both to no avail. You'd think that over doing it with 2 might do the trick, but it apparantly does not sometimes. Derrick from Illinois and Russel from Michigan advised me to run it with the system open with one of thos...
2000 Oldsmobile Intrigue GL 3.5L heater core VIN: 1G3WS52H7Y
got a lot of interesting replies on this one...four thought w/pump slipping or rusted away, one for intake leak like happens on the 3.8s, two mentions of a restrictor or reducer (this engine doesn't have one this year), four of five for blockage in heater core...
1997 Pontiac Grand Prix SE 3.1L Dash, starter VIN: 1G2WJ52M2V
Thanks again guys! Many of you made the suggestion that the contacts in the switch was the problem. I took the switch completely out and opened it up and sure enough there was one really burnt contact and two that weren't quite as bad. I put a new switch in it...
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