no fire very confused
Moderator
Joined: Jan 2004
Posts: 13,851
Likes: 111
From: SW Va
Before you pay big bucks to bring the pro's in, chack the in cab fuse to the under hood computer power relay's operating coil & the computers power fuse that the under hood relay is swtching.
If the first fuse is blown, the computers under hood power relay won't operate to switch power to the computer.
If the second fuse is blown (the computers power fuse) & computers power relay is working, the relay won't have anything to switch to the computer, to power it up.
So check those two fuses & the computers power relay, to make sure it's awake & workng.
If in doubt about the computers power relay, try "thumping" it & see if it'll wake up, or try swapping it for a like relay, not needed to run the vehicle, say maybe the A/C relay, or the like.
Let us know what you find.
If the first fuse is blown, the computers under hood power relay won't operate to switch power to the computer.
If the second fuse is blown (the computers power fuse) & computers power relay is working, the relay won't have anything to switch to the computer, to power it up.
So check those two fuses & the computers power relay, to make sure it's awake & workng.
If in doubt about the computers power relay, try "thumping" it & see if it'll wake up, or try swapping it for a like relay, not needed to run the vehicle, say maybe the A/C relay, or the like.
Let us know what you find.
Thread Starter
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New User
Joined: Apr 2007
Posts: 13
Likes: 0
found problem with fire.always make sure all wires are connected.had wire under solinoid that was connected to the fuse panel that gave fire through computer. the whole time it was a wire.thanks for all the help. hope i can help someone else . ps nothing wrong with modules tested, was something wrong with test plug on machine ha! go advance!
Moderator
Joined: Jan 2004
Posts: 13,851
Likes: 111
From: SW Va
Well if it has fire to all the plugs, but only hitting on 3 cyl's, then maybe it's time to have a "listen" to each of the injectors, with a stethoscope, or you could fashion one by using a wooden dowell, like a broom handel, long handel screwdriver, or maybe a piece of hose, or the like & determine if all are awake & "clicking".
If not, use your multimeter to make sure the injector has power to the connector & use a "noid" light to determine if the suspect injector is getting a ground pulse to operate.
If all that comes to naught, then maybe a cylinder compression test is in order, or if it's easier & you have a vacuum gauge, hook it up & see whats up with the engine mechanically.
Just some trouble shooting thoughts for consideration.
If not, use your multimeter to make sure the injector has power to the connector & use a "noid" light to determine if the suspect injector is getting a ground pulse to operate.
If all that comes to naught, then maybe a cylinder compression test is in order, or if it's easier & you have a vacuum gauge, hook it up & see whats up with the engine mechanically.
Just some trouble shooting thoughts for consideration.