GM Automotive Technicians Technical Discussion and Fixes for Jun 7, 2004 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1999 Buick Century Limited 3.1L Blend door actuator VIN: 2G4WY52MXX Customer complained that the driver's side A/C was always blowing hot. (It has dual zone climate control.) The passenger side was operating normally. When we saw the vehicle, the system worked exactly as the customer described, (passenger side cool, driver's s...	View
	1999 Cadillac DeVille 4.6L Stall, Misfire VIN: 1G6KD54Y5X This is a rear time that I've had to post a question due to the abundance of repairs I've made just by reading all the other difficult solutions which have already been posted. I have a this 99 Deville which has me stuck. Initial complaint was intermittent sta... Trouble codes: P1599 (engine stall detected)	View
	2002 Cadillac Escalade 6.0L i/p hvac VIN: IGNEK62N03 heres my latest nightmare ,gmtech assist hasnt been much help.intermittantly the i/p guages except oil pressure will drop out,the radio and hvac will cease to operate as well,there have been two ignition switchs in this unit and during the condition which usua...	View
	1986 Chevrolet Camaro Z28 Iroc-Z 5.0L Hesitation, Cuts out VIN: 1G1FP87HXG This car has a hesitation that is worse when cold but happens intermittently when hot, usualy at half throttle and only on acceleration. Sometimes it runs great and sometimes it falls on its face and has momentary loss of throttle responce. It happens often en...	View
	1999 Chevrolet Corvette 5.7L tire pressure monitor VIN: 1G1YY32G7X Customer put on new rims and tires and does not have the tire pressure sensors. He no longer has run-flat tires and wants the "service tire mon. sys." display off when first starting car. Is it possible to turn off this display or by-pass this system.	View
	1999 Chevrolet Express 3500 6.5L runaway idle VIN: 1GCHG35F3Y If any GM tech could assist, I could use deisel help. Like most of us do,I'm helping a freind with this case. He's the Tractor Trailer shop next door and has bailed me out before. #1 Truck smokes like crazy but Runs good-(DSL smoke) #2 Idle will RUNAWAY to ...	View
	1999 Chevrolet Cavalier 2.2L High beam and daytime running lights Vehicle came to shop with no high beam or daytime running lights. When you start the car, as soon as you put in drive, you can hear the running light relay click rapidly and see the dash light flashes rapidly. I checked for voltage at both headlights, and ther...	View
	2000 Chevrolet Cavalier 2.2L temp gauge VIN: 1G1JC1248Y found the temp gauge to always read the same position no matter what the engine temp. this appeared to happen all of a sudden. found that there is not a coolant sender for the gauge. it is a modified signal from the coolant sensor and enters into the body comp...	View
	2000 Chevrolet Suburban 1500 LT 5.3L No Start VIN: 3GNFK16T7Y Car towed in with no start condition. Customer thought they were out of fuel. Found no fuel pressure. Checked fuel pump relay and found that there was no power to relay at all. Ran jumper to pin 37 and had 60psi at test port. SO pump is fine, but no power. Nex...	View
	2003 Chevrolet Silverado 2500 6.0L speedometer VIN: 1GCHK29U53 Drove in to shop. speedometer registers 30mph while parked. Genisys scan tool reads speed sensor output correctly when driving. No diagnostic codes available, cannot access instrument panel cluster data. This speedo is an analog model based on the speed sensor...	View
	1995 GMC C3500 Sierra SL 6.5L Excessive Emissions, Poor Idle Quality, Misfire VIN: 1GTHC39F6S When the customer brought the vehicle in, the truck was running rough, exessive black smoke, poor accelerattion, hard to start cold. No codes showing, then if you floor the throttle, immeiately the engine service light comes on and the truck revs up and runs s... Trouble codes: 18 (camshaft reference pulse), 35 (injector pulsewidth-short)	View
	1993 Oldsmobile 98 Regency Elite 3.8L No Start VIN: 1G3CW53L1P Good Evening, Basicly the car was towed in for no start, cranks ok. Found no spark, no injector pulse. Scanned and found no crank signal (I do not recall any codes), checked CKPS signal 3x and 18x and found only 18x, replaced crank sensor, gained 3x, still no...	View
	1995 Oldsmobile Cutlass Supreme SL 3.1L temp gauge VIN: 1G3WH52M1S Temp gauge on dash reads higher than actual engine temp. from PCM temp data. When PCM is reading 210, the temp on the gauge can read as high as the mark for 235 degrees. the amount of error seems to vary with engine temp, with the error getting higher as temp ...	View
	2001 Oldsmobile Aurora 3.5L trunk lid VIN: 1G3GR64H21 Hello, the trunk lid torsion rods open the lid too fast and it slams against its stops. This is a problem when using the key fob or remote trunk release switch on the driver's door, as you aren't there to "catch it". I was wondering how or if the torsion rods...	View
	1990 Pontiac Grand Am LE 2.3L Poor Fuel Economy VIN: IG2NE1102L Hi guys and girls.As promised I am getting back to all those who wanted to know how this pulling tractor worked out with the quad 4 engine.On Sat june 5 was our first pull and the quad 4 did not do well at all.This engine is hooked to an Alfa Romeo clutch/tran...	View
	1996 Pontiac Grand Am SE 2.4L No Start VIN: 1G2NE52TXT hello fellow techs This vehicle came in as an intermitent no start, usually cold. we let it sit and get cold, no start. Turn key on fuel pump operation, and pressure good. Scan tool started showing rpm then dropped out. After cranking stopped, no fuel pump op... Trouble codes: 0122 (tps circuit)	View
	2000 Pontiac Grand Am SE 3.4L steering This car only makes the noise when put in reverse, then turn steering to left lock while backing. It will only do it once-to repeat noise you have to go forward then repeat reversing as described. I noticed when noise occurs, lf wheel jerks slightly-leading ...	View
	1999 Saturn SC2 1.9L Surge, Misfire VIN: 1G8ZR1274X CAR WAS BROUGHT IN FOR BASIC SERVICE ALSO COMPLAINED ABOUT JERKING ON SLIGHT ACCELERATION AND STALLING. INSPECTED TPS NO PROBLEM NOTED WITH WAVE FORM. INSPECTED THROTTLE BODY CLEANED THROTTLE PLATE. TEST DROVE CAR AND PROBLEM STILL NOTED. iNSPECTED WIRES AND P... Trouble codes: P0562 (system voltage low), P1599 (engine stall or stal detected), P1602, 10W, C0001, C1RCU	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1989 Cadillac DeVille 4.5L ECC Display and Fuel Data VIN: 1G6CD5155K Received 7 replies to my help request and appreciate all of them. Most folks said the problem would be in the BCM. One person said to check the A/C Programer. The actual fix was the BCM. We tested all inputs and outputs to and from the ECC, FDC, & BCM. The o...	8
	1994 Chevrolet G20 Chevy Van 5.7L Ring & Pinion The Customer with this van decided that he would have to live with noise at this time. After another retrace of the repairs made I decided that the only way to get this diff any quieter would be to try another ring & pinion set, Which he quickly refused to do ...	10
	1995 Chevrolet Camaro 3.4L No Start, Misfire VIN: 1T2G1FP22S Well this creation drove away from the shop under its own power friday! The fix was to replace the new ignition module with another new module as the first one turned out to be defective right out of the box! It was a Borg Warner brand installed by the shop th...	5
	1995 Chevrolet Astro 4.3L Misfire VIN: 1GKDM19W3S Well this van is purring like at cat.Thanks to Craig from OH,Richard from ID,Jeff and Scott from WI and Victor from Trinidad.My mistake in my judgement of injector spray pattern.I said it had spark,compression and fuel but after 2 months this CPI injector unit...	5
	1996 Chevrolet Cavalier LS 2.2L Stall VIN: 4G1JF3241T I Apologise in the delay in closing this post. I have not been able to make any progress. Thanks to those who did reply. I did check for rodent damage and checked all connectors but found nothing. My main problem is without a tech 2 i cant comminucate with thi... Trouble codes: P0107 (map sendor low input), P0122 (tps low input), P0753 (shift solenoid a), P0758 (shift solenoid b).	4
	1997 Chevrolet Lumina 3.1L abs VIN: 2G1WL52MXV I was able to try 2 of the 3 replies that I got from IATN members. One was a contact enhancer which did not improve the problem, the other was to try a new relay, again that did not repair the problem. The third reply suggested a controller problem, but we did...	3
	2000 Chevrolet Corvette 5.7L Turn Signals Thank you all for the informative fixes I received. Dennis from Iowa also stated a shortcut that may have provided a time savings should the customer decide to try the repair. For now he is waffling between the intermittency of the problem and complete failure...	5
	2002 Chevrolet Suburban 1500 LT 5.3L MIL Lamp on VIN: 3GNFK16T62 Hi guys, thanks for all the wonderful replays I got from you guys. You guys were right on the money. All of you guys said it is an ignition switch that has very common problem with it, where it would not supply power to the transmission and to instrument clust... Trouble codes: P0740 (Converter clutch system problem), P0753 (Shift Solenoid A circuit fault), P0758 (Shift solenoid B circuit), P0785 (3rd and 2nd shift sloleniod), P1860 (Torque converter clutch pulse width modulation).	14
	1993 GMC C1500 Sierra SLE 5.7L MIL Lamp on VIN: 1GTDC14K6P after retesting several times and getting the wrong parts from the dealer ( using vin for id ) twice . we finally got the correct knock sensor installed, retested no codes . thanks for the input .ps. the resistance was 10000 on the incorrect instead of 35000 w... Trouble codes: 43 (knock sensor).	5
	1997 GMC C3500 Sierra SL 7.4L Lifter noise VIN: 1GTHC39JXV 2 hydraulic lifters needed to be replaced. Managed to perform this by removing only the valve cover (drivers side) for access. Thanks to all. Ken	9
	1998 Oldsmobile Aurora 4.0L Fuel Fill VIN: 1G3GR62C4W Thanks to all 16 who responded. 2 said to check small vent tube next to filler. This application has only a 1 tube filler neck which I assume has vent tube internal. Had removed and inspected and found to be ok. Most of you hit it right on the head. The vent s...	17

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