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Prev Professional Automotive Repair Technical Discussions for August 11, 2004
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Open Help Requests for GM
Help Request Answers
1991 Buick Skylark 3.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G4NV54N3M
Ok..This car came in with customer saying sometimes it backfired a lot while at idle...Code 42 is current. Electronic Spark Timing... Now I have had some work with the 3.8 in this area so I am thinking its a similar setup... It must have a bad connection..in t... Trouble codes: 42 (EST Circuit Error)
1991 Buick LeSabre 3.8L Hesitation VIN: 1A4234RM7R
Hello all, thank you in advance for any help. this car hesitates, kind of like a miss, on bottom end of rpms when you take off slowly or about 1/2 throttle . Either driving or in park. if you don't let it return all the way to idle it won't do it. and doesn't ... Trouble codes: 41 (no cam signal)
1992 Buick LeSabre Custom 3.8L MIL Lamp on VIN: 1G4HP53L4N
customer came in with mil on so we pulled code 13 o2 sensor. so we cleared it to see if it came back on. one week later the mil was back on so we replaced the sensor with an aftermarket unit whitch for a none obd11 vehicle works fine. well it is back with code... Trouble codes: 13 (o2 sensor)
1995 Buick Regal 3.8L Misfire VIN: 2G4WN23L4P
In need of assistance, I got this one in good customer of course. it acts like a lean misfire or a tcc slip at speeds of 40 and above with light throttle. only seems to do it once it warms up. obd1 so I have no misfire data other than weak cylinder info and th...
1994 Cadillac DeVille 4.9L Stall, Misfire VIN: 1G6KD52B5R
Vehicle seems to be experiencing an intermittent ignition break-up. This problem occurs erratically and therefore is hard to diagnosis. However, customer would like to have this problem corrected as it prevents him from safely using vehicle.
1987 Chevrolet Astro 4.3L Poor Idle Quality, Hesitation, Cuts out, Stall VIN: 1GCDM15Z1H
started out idle problem was intermittent with eng. hot. over the past couple of months. then it started happening more regularly. codes 33 and 34 have been getting set. checked voltages, wiring, replaced map sensor and exchanged ecm. it does seem to help idle... Trouble codes: 33 (map sensor high voltage), 34 (map sensor low voltage)
1988 Chevrolet S10 Blazer Sport 4.3L Stall VIN: 1GNCT18Z0J
Hey guys and galls got a good one. I havent done much yet cause of the hour but thaught I would post it cause it is so odd and maybe someone has run across it before. The blazer runs good if you are on the brake but crapy when not on the brake. My first thaugh...
1994 Chevrolet K2500 Suburban 7.4L coolant VIN: 1GNGK26N4R
hi, i could sure use some help got this unit running hot around 238-240 looked at the fix data-base found only hit to exact problemm but no fix. any help would be great. this 1 post was from paul howdeshell and he recieved an e-mail from an eng. from chev. tel...
1997 Chevrolet C3500 Cheyenne 6.5L abs motor VIN: 1GCHC33F6V
2000 Chevrolet Express 2500 5.7L Hesitation VIN: 1GCGG2557Y
problem is intermittent.customer says van has been running poorly for a few months.has only happened for me after a hot soak.customer not positive if van always runs good cold. problem feels like a lean misfire and van has loss of power on hard accel.funny thi...
2002 Chevrolet S10 2.2L Hesitation VIN: 1GCCS14571
This truck is used every day for parts delivery. So I guess you could say it operates under hard driving conditions. The problem has me stumped. When pulling out into traffic after coming to a stop it will fall on its face, Lose power, however it dose not di...
2002 Chevrolet Venture 3.4L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, MIL Lamp on
this is for database. no need to reply. code p0300 and lean code (don't have it here) bank 1. engine would start to misfire when warmed up. luckily it was real low on gas and went for test drive and felt like it was running out. put in 5 gallons and ran a lot ... Trouble codes: P0300
1995 GMC C1500 Suburban 5.7L no 2-3 shift VIN: 1GKEC16K2S
well, first thanks in advance for any help on this.. i have a 1995 gmc with a 4L60E transmission came in trans sounded like it was coming apart.. would not shift out of second gear. took apart planatary gone.. rebuilt with new front and rear planatary's clutch...
1996 GMC Yukon SLE 5.7L MIL Lamp on VIN: 1GKEC13RXT
This truck runs good, idles slightly rough, has no missfire counts. This started after cylinder head replacement it set code P1153 we inspected b2 s1 sensor & replaced it (coolant contamnated). In 20 miles it reset same code. We preformed test chart, there wer... Trouble codes: P1153 (insufficient switching bank 2 sensor 1), P0155 (ho2 heater ciccut bank 2 sensor 1)
1999 GMC K1500 Suburban SLE 5.7L No Start VIN: 1GKFK16R4X
Hi there. I have this no start condition. It has spark fuel pressure is 38 psi and it will start with starting fluid.It just wont stay running. Check for injector pulse and can see them working but it still wont start. I have noticed that fuel preasurre bleeds... Trouble codes: P0300 (random misfire), P0304 (cyl 4 misfire)
1995 Oldsmobile Cutlass Supreme SL 3.1L 1-2 shift VIN: 1G3WH52M9S
This transmission will not upshift into 2nd gear, if accelerating up to about 30 and let off it will drop into 3rd. It will however downshift into 2nd, and holds fine, and upshifts then into 3rd good. I have switched solenoids, scanner also shows they are swit...
1998 Oldsmobile Intrigue 3.8L dash/taillights VIN: 1G3W552K5W
dash/taillamps work intermittenly.when inop.turn signals also inop but cornering work @ all times.have read several posts for similar problems on auroa models & alt. issues on intrigue models with 3.5 liters but not the 3.8's.mitchell very vague & does'nt give...
1995 Pontiac Grand Prix SE 3.1L Stall, Misfire VIN: 1G2WJ52M1S
This vehicle came in about a month ago with a bad intermittent misfire. Checking with the vantage determined the crank sensor to be erratic (no Codes). Replaced the crank sensor along with the Iac motor and performed system relearn. The vehicle just came back ... Trouble codes: 13 (Historical code O2 senser open)

Fixes & Summaries for GM
Fix/Summary Answers
1994 Cadillac Eldorado 4.6L No Start VIN: 21.353
we found it the map sensor was bad we should have stuck with the trouble code first instead of thinking it was being set because the engine was dieing thanx to all the replys
1984 Chevrolet Camaro Berlinetta 5.0L Poor Idle Quality VIN: 1G1AP87611
Haven't found the problem yet. Pretty sure it is the cam. We just got the cam but I need to close this post before I can get it in. Sorry I couldn't write more.
1984 Chevrolet Camaro Berlinetta 5.0L Poor Idle Quality, Hesitation, Surge, Stall VIN: 1G1AP87611
Haven't found the problem yet. Pretty sure it is the cam. We just got the cam but I need to close this post before I can get it in. Sorry I couldn't write more.
1987 Chevrolet V20 Custom Deluxe 5.7L Poor Idle Quality, Hesitation, Stall VIN: 1GCEV24K7H
Most of the replies I received were to replace or rebuild the distributor. My customer has not returned to have repairs completed.
1993 Chevrolet S10 Blazer Tahoe 4.3L won;t hold pressure VIN: 1GNCS13W5P
This one is fixed I thought I closed this before but it must not have gone through. Sorry for the delay. The pulsator was bad so I replaced w/ a hose. Thanks for all the imput. I've fixed several of these over the years and never had a bad pulsator but theres ...
1998 Chevrolet K1500 Cheyenne 5.7L cluster,radio VIN: 1GCEK19R6W
Here is the scoop. The truck arrived as scheduled 10 days ago. I waited this long to close it as I wanted to be as sure as possible that the problem has been resolved. I was informed by my customer that the dealer supposedly 'captured' the ignition switch el...
2000 Chevrolet S10 2.2L extended cranking VIN: 1GCCS1457Y
hello everybody thanks for the two replies that i got, but unfortuneately they were not applicable to my question.when i get some usefull information or a fix for this vehicles problem i will amend this close
1996 Oldsmobile Cutlass Supreme 3.1L Misfire
The injectors were the problem. I put GM injector cleaner in the gas tank and the customer said the care has been running fine. Sorry it took so long to get back to this. Thanks again for all the help. Trouble codes: P0300.
2001 Oldsmobile Intrigue GL 3.5L Stall, MIL Lamp on VIN: 1G3WS52H41
The consensus of replies was to replace the sensor, because they often fail and you may never catch it in the act. A couple of replies also suggested checking for fuel in the fuel pressure regulator line because that is also a known problem. We replaced the se... Trouble codes: P0385 (CKP Sensor B Ckt problem), P1372 (CKP circuit).
1999 Pontiac Grand Am SE 2.4L No Start VIN: 1G2NE12T1X
Thanks for the help. Replaced lock cylinder and ignition switch. Disassembled old swith and points were burnt. Time will tell. Trouble codes: P1631 (password incorrect), P1632 (fuel disabled).
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