GM Automotive Technicians Technical Discussion and Fixes for Sep 8, 2004 - iATN (Members Only)

×

Join Now

Prev	Professional Automotive Repair Technical Discussions for September 8, 2004 International Automotive Technicians' Network (iATN) - Members Only	Next
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Open Help Requests for GM

	Help Request	Answers
	2002 Buick Century Custom 3.1L Hesitation, NO POWER VIN: 2G4WS52J52 this car has got me.car came in with no power all the time. when road test the car seem to labor, like pluged cat.took cat out and was good. checked air intake and that was clean. map and baro working with rpm. mass air flow new 7gps at idle and about 110 at w...	View
	1990 Chevrolet Camaro Iroc-Z 5.7L Excessive Emissions VIN: 1G1FP2389L hi fellows please help i got this 90 camaro with 5.7 tune port it wont pass emmision. owner had catality converters replace two days before he drop the the car at the shop we hook our sun machine foun two injectors not working, #3 spark plug wire burn fro the ...	View
	1991 Chevrolet Lumina Euro 3.1L Cuts out, Stall VIN: 2G1WN54T2M Thanx in advance for any help all right you g.m. guys we have so much diagnosise time in it isn't funny. loosing our hair this lumina will start and idle. when hooked up to the snap on scanner when the car is dead cold scanner says that the cat temp is 766 deg...	View
	1992 Chevrolet K2500 Suburban Silverado 7.4L Excessive Emissions, Poor Idle Quality, Cuts out, Poor Fuel Economy VIN: 1GNGK26N7N This one came in after the cust replaced all of the above items it runs rough in park and sometimes stalls in park. It cuts off as soon as you put it in drive. I checked timing and it is fine the baro is reading about 102 and 4.98 volts the fuel pressure stays...	View
	1994 Chevrolet Camaro 3.4L Security warning lamp VIN: 2G1FP22S5R Hi, some weeks ago i had this car repaired , the tiny wires for the PASS/Key reader in the ignition lock were broken , after some surgery the car started and ran fine for about two weeks , since then , the car starts and runs normally , but the "security" warn...	View
	1995 Chevrolet K2500 6.5L Excessive Emissions VIN: 1GCGK29F0S Hello all, We're trying to decipher were to start on this problem diesle. It runs well cold, if fact, in the winter they use it to push snow, and it works great. However, in the heat of the summer, it lacks power, and will blow black out the tailpipe like mad ...	View
	1995 Chevrolet Astro CL 4.3L heater control valve VIN: 1GNEL19W6S Got a 95 Astro with rear A/C and rear heat, getting heat at all times from the rear unit. Can’t find any information on how the system functions, suspect it might be dealer installed. There are no separate heater or A/C temperature controls for the rear unit s...	View
	1996 Chevrolet Corsica 3.1L MIL Lamp on, comes back on VIN: 1G1LD55M4T on this vehicle we have replaced the MAP sensor and the EGR everything else has tested good on this vehicle but the code keeps on coming back. Trouble codes: P0401 (EGR flow)	View
	1996 Chevrolet K1500 4.3L No Start we told customer he needed an o2 sensor; but based on mileage and all original o2 sensors we recommend changing all 3. he agreed, repairs were made, test drove - no codes present. we released vehicle to customer but within 1-2 days code 154 came up again. we w... Trouble codes: 154 (bank 2 sensor 1 fault), 175 (rich in history)	View
	1998 Chevrolet K1500 Cheyenne 5.7L exh flange failure VIN: 1GCEK14R9W visual inspection of exhaust manifold at Bank 2 show, O2 sensor loose and installed in wrong position. send it to moffler shop an repositioned exhaut pipe and replaced O2 sensor before catalitic converter. Installed sacanner and found two codes. PO174 fuel sys... Trouble codes: P0160 (low O2sensor act. Bank2 Sensor 2), P0174 (fuel system lean bank two)	View
	1998 GMC Jimmy Envoy 4.3L 4wd VIN: 1GKDT13W3W Vehicle exhibits ratcheting noise from undercar. The only time it happens is under steady load 5 seconds or more, on an incline, right when you take your foot off the gas on deceleration it starts immediately, the noise sounds like something hitting a splined ...	View
	1992 Oldsmobile Toronado 3.8L Dash waring display , The A/C ,heater display VIN: 1G3EZ13L9N The customer came in complaining that the electronic display on the dash and the electronic dislpay on the temp. contols go out when the car is cold or wet.The systems work when the car is warm or dry.When they go out the dash disply is blank and the temp cont...	View
	1995 Oldsmobile Achieva S 2.3L abs VIN: 1G3NL15D7S This one is a little scary to drive. When driving under any conditions this vehicle goes into an abs stop whenever it feels like it. I get no codes, we scanned the computer and captured a movie of it while it was doing this and everything looks fine. The drive...	View
	1998 Oldsmobile Cutlass 3.1L Misfire, MIL Lamp on picking up misfire on 3&6 cylinder fire is good compression is 140 lbs on both cylinders no vacum leaks found check egr vavle no problem found run flow check on injectors checked ok ? may have bad injecotr no driver flauts on scanner plugs wires coil checked o... Trouble codes: 300 (misfire)	View
	1999 Oldsmobile Cutlass GL 3.1L Unknown VIN: 1G1FUEDGTX Greetings to all GM techs, I have a cutlass here with an odd problem. The customer comes in with 2 problems that have occured almost at the same time. The first one is that the transmission bangs very harsely with engaging gears (especially 1-2). The second co...	View
	2000 Oldsmobile Intrigue GLS 3.5L Unknown VIN: 1G3WX52H4Y Vehicle came in with pedal pulsation and knocking noise from front left.We replaced rotors,brake pads and calipers.Also replaced guide pin bushings and inserts per gm tsb.Pulsation and loud knocking noise from front left still present when brake applied.Lower ...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1995 Buick Regal Custom 3.1L Poor Idle Quality VIN: 2G4WB52M5S well,this has been a lengthly ordeal. after replacing the ecu with one that had been previosly programmed by someone for a different transmission, which sent us off on a wild goose chase, we kept the car for enough time to catch this very intermittant problem ... Trouble codes: 28 (transmission range selection sensor error.).	3
	1997 Buick Park Avenue 3.8L starter VIN: 1G4CW52K6V thank you to all who responded.knowing the pass key system was not the fault,we went after the ignition switch.since this vehicle had over 140,000 miles on it and the customer stated he did a lot of stops we decided it would be one of the electrical components...	15
	1963 Chevrolet corvair 2.4L powergluide VIN: 30927W2417 Most of the replies suggested that the torque converter is draining back. Others stated that old cars that are not driven leak. We all know this is a fact. We did get some great info as to other causes from people like Chuck [...] who obviously has worked on ...	14
	1988 Chevrolet R20 Silverado 5.7L Poor Idle Quality, Surge, Stall VIN: 1GCGR23K1J Thanks IATN, regrettably I have to close with summary.I got 13 responses many dealing with dist issues. Cracked magnets being the biggest problem.Others dealt with vacuum leaks.Truck is erratic, customer said he would deal with it when it acts up as long as it...	14
	1992 Chevrolet Blazer Cheyenne 5.7L Poor Idle Quality, Stall VIN: 1GNEK18K8N Well, thanks for the help everyone. This one was kind of tricky. There were a lot of suggestions on this one, including: Distributor shaft magnet cracked/worn out Dist. pickup Ignition module All of the above Bad injectors/regulator spring broken/foreign mater...	14
	1993 Chevrolet K1500 Cheyenne 5.7L 3-4 clutches repeat burned VIN: 2GCEK19K6P vehicle is fixed, installed alto clutch pack with 9 clutches and steels, thanks for the help from everyone, I should have included all the other info others wanted, 2-4 band is not burnt valve body is not wallowed after sonnax repair, clutches still burned wit...	7
	2002 Chevrolet Corvette 5.7L flywheel VIN: 1G1YY22G82 OK, Thanks to all the great responses I got+ a little inside info from a few corvette engineers, It turns out that the flywheel, clutch disc and pressure plate are a balanced assembly from the factory. SO-if you were going to replace only the flywheel, you mus...	8
	1990 Oldsmobile Delta 88 Royale 3.8L Surge, Cuts out, Stall, MIL Lamp on VIN: 1G3HN54C5L even after installing crank sensor and ecm car still cuts out, all powers and grounds double checked, what next. fuel is at factory specs.	10
	1994 Oldsmobile 88 Royale 3.8L MIL Lamp on VIN: 1G3HN5213R Thanks everyone who took they time to help fixing this car. I have tried with 4 diffrent scaner including tech 1 to communicate with the PCM but was negative the car had only one DLC OBDII all the wires coming to DLC ck OK. Final fix was the PCM, Instal one wi...	13
	1995 Oldsmobile Aurora 4.0L MIL Lamp on, IDLE SPEED HIGH VIN: 1G3GR62C0S car is on the road again.we tried everyones advise.then we took two big steps back. the original complaint was a ratching throttle.during our test the old isc would jerk in so bad and stop.the new isc motor went in very smooth but took up too 1 to 2 minutes.th... Trouble codes: P0055 (closed throttle out of range), P0080 (idle relearn).	5
	1995 Oldsmobile Aurora 4.0L alt VIN: 1G3GR62C7S Yes its fixed the thermister was the problem.Turns out it should have 1500 ohms res.I got 11 replies and they were all helpfull but i want to especially thank John [...] for their time and well written explanations.I just had a hard time seei...	12

(Also Available: All, Asian, Chrysler, European, Ford, GM.)