This post is likely to be long and a bit convoluted as the no-start issue has been a bit of a bugger to figure out what’s going on. Also, I’m a bit of a perfectionist, so I like to analyse issues fairly methodically and in some depth. My sources so far have been the Autozone web site and a Haynes manual, which I find to be less helpful these days than they used to be.
- Vehicle info and history
Basic Vehicle Specifications (from RPO codes)
L19: Engine:7.4L, 1TBI, V8 / FE9: Certification: Emission, Federal / NA5: Emission System: Federal, Tier 0 / K68: Generator: 105 Ampere / MT1: Transmission: 4L80-E, 4-Speed automatic, Electronic / KNP: Transmission, Heavy Duty Cooling System / GT4: Rear Axle: 3.73 Ratio / G80: Rear Axle: Positraction / JD7: Brake System: Hydraulic Power, Front Disc, Rear Drum, 8400 Lbs / Z82: Trailer Provisions Special equipment, Heavy Duty / No code : Trailer brake controller and seven pin connector / C6P: 8600 Lbs. GVW Rating / Z49: Export, Canadian Modified Mandatory Base Equipment.
The truck was purchased privately in October of 2009, and its previous use was mainly as a race car hauler. Since then there have been several issues including ABS problems, fuel pump and fuel line, distributor, front hubs, accessory belt tensioner, exhaust system and water pump, and a few lesser problems. The truck has always been parked outside, and the current issue presented itself in early February this year, first as a no start problem (starter solenoid clicked but no engine rotation) whenever the temperature got below 15*C, especially when parked in the wind. Plugging in the block heater helped to start the engine, but not when the temperature got down to 20*C or so. In mid February we got a warm spell, so I tried to start the engine so I could move the truck out of the wind. The engine started, ran OK for a few seconds, then coughed a bit and quit, and after that it would turn over on the starter but not start, and that is the condition up to date.
Over the time I’ve had the truck I’ve had to replace several components, and the following are those for the ignition, fuel, intake, and exhaust systems which may impact on the current problem:
- Jan. 18/10 – new fuel pump
- Jan. 27/10 – new coil – ACDELCO D503A
- Mar. 8/10 – new fuel pump relay (spare)
- Apr. 15/10 – new distributor ( GM dealer) – N023610 (not sure if it included new ignition module, pick-up coil and cap and rotor)
- Jun. 24/10 – new Bosch Premium ignition wire set (old wire set had some suspect resistance readings) – discovered later on the Turbobricks (Volvo) web site that Bosch wire sets don’t have the best performance
- Jul. 23/10 – new air cleaner to throttle body gasket
- Aug. 5/10 – new gauge and ECU temperature sensors
- Aug. 24/10 – leaking underbody fuel line replaced
- Sept. 20/10 – new cat back exhaust system
- Mar. 9/12 – new coil – Standard Blue Streak DR37 (previous ACDELCO D503A coil gave suspect readings)
- No trouble codes
- Fuel pump cycled with the ignition key on “start”
- Fuel at throttle body when cranking
- Under hood electric centre fuses OK, both new (spare) and old fuel pump relays OK
- Got spark with in-line spark tester on coil and all spark plug leads (but looked a bit weak)
- Pulled, cleaned and gapped all plugs – don’t know how old they are but condition looked OK, insulators brown and no fouling, etc.
- Camshaft turns over when cranking (tested at #3 cylinder through the oil filler hole – valves working)
- Tried to start again – no change
Oh yeah ... I hope you like long stories.
Also (senior moment) I forgot to mention that I did a search on this board and didn't find a similar issue.
Edited by John's Trucks, 30 March 2012 - 08:43 PM.