I have a 1987 chevy truck with 350 fuel injected. I first noticed trouble when the truck would not crank a few weeks ago. It was getting fire to the plugs but would not start.......even when i put some gas in the throttle body. I know the fuel pump is good . But I know the truck shouldf start if gas in the throttle body is put...but not if the injectors are not being turned on by some electronic switch? The truck started though the day after this happened with no trouble. So I drove it around until I had a rain one morning. The truck would do same thing..no cranking..plenty fired to plugs..and put little gas in throttle body. Then when it was warm next day and no rain it started up again. Please someone give me some suggestions what I need to replace..and I dont think its a distributor cap.
2007-07-03 17:00:10 · 3 answers · asked by Anonymous in Cars & Transportation ➔ Car Makes ➔ Chevrolet
The trucks motor turns..it wont start up and run
2007-07-03 17:22:36 · update #1
I pulled each plug and getting fire there
2007-07-03 17:23:15 · update #2
I know this is redundant, but are you checking for spark when the motor will not start? With intermittent problems you have to check when the issue is happening. Just be sure that you do have spark when the motor is not firing up. Again, be sure that the fuel pump is working and building pressure when the motor will not start as a lot of this wiring is exposed to rain so it could be your issue. If all this is good, spark to the plugs and fuel pressure to the TBI unit, then you just have an injector trigger problem. Since you have a fairly old truck and seem to be experiencing problems when it is wet, I would first inspect the wiring from the injectors on top of the TBI to where they go through the TBI unit through a little grommet to be sure the wires have not got any rubbed through insulation. Check all the way back to where the wires enter the cab to go back to the PCM. If you find anything you have probably found what is ailing it. If all this looks okay, make sure the spring type connection inside the connector to the injectors are okay as these are exposed to damp air an dit could be enough to leak voltage away. If all that is good, you will have to determine if the ignition module is sending a trigger signal back to the PCM for RPM. The only way to check this is to get a scanner and watch the motor speed while cranking. This was never a problem when I was looking for problems like this. Likewise, the PCMs in these trucks were never a source of injector drivers being burnt out. It was usually a wiring fault under the hood. You could possibly have a primary ignition problem that only shows up when wet meaning to have a good look at the pick up coil and module inside the distributor as well make sure the dist. shaft is not worn out with side to side movement. These are weird problems and a ton of patience is required to find them. Good luck.
2007-07-04 07:23:58 · answer #1 · answered by Deano 7 · 0⤊ 0⤋
Your cap might be getting a little wet. Just enough to give fire but not constently enough to keep the motor running. Or your getting water in your gas some how. Good luck Hope I helped.
2007-07-03 17:57:48 · answer #2 · answered by Anonymous · 0⤊ 0⤋
confused! you are saying the truck doesn't crank or it doesn't start.
2007-07-03 17:15:36 · answer #3 · answered by batterybackup 2 · 0⤊ 0⤋