mechanic's HELP!! Engine wont staRT
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Joined: Dec 2002
Posts: 89
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From: Sparta MI
mechanic's HELP!! Engine wont staRT
ok here is my headache!!!! I have 43 psi at the rail. I have spark. new burnoff,and power relay for maf. the computer has power The voltage changes at the injectors when the engine turns over. when I spray starter fluid into the plenum it starts momentarily ANY help from you pros would help me tons the car is in the shop now! they have 6 hrs into it yet with no results OH one more thing i have another ecm I tried that to no avail
[Modified by inmy84vette, 4:06 PM 2/6/2003]
[Modified by inmy84vette, 4:06 PM 2/6/2003]
Safety Car
Joined: Feb 2002
Posts: 4,212
Likes: 10
From: Sun City West Az
Re: mechanic's HELP!! Engine wont staRT (inmy84vette)
OK...if it tries to start upon spraying it with starter fluid but won't start without it, you have a fuel issue of some type. Crank it over a few times and pull a couple of plugs to see if they are wet with fuel. I'll bet they aren't. If you have 43 psi WHILE CRANKING you should be delivering fuel to the cylinders and the plugs should be wet. If not, I'd suspect injectors or related hardware. Good luck.
Team Owner
Joined: Mar 2001
Posts: 54,124
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From: Cincinnati, Oh USA
Re: mechanic's HELP!! Engine wont staRT (inmy84vette)
What do you mean by , "the voltage changes at the injectors"? It sounds like your injectors are not being pulsed, so there is no fuel being delivered. The injector coils are pulsed by the ECM, so put a low power 12v lamp on an injector plug and see if it flashes while cranking. Check both injector fuses.
Burning Brakes
Joined: Sep 2000
Posts: 1,199
Likes: 1
From: NewCastle IN. USA
Re: mechanic's HELP!! Engine wont staRT (jfb)
bad gas?
how old is the fuel? and has the vette been sitting where someone could have added evil tiding's to the gastank?
whats the details of how this happened? did it start up one morning, run for a little and die? die while you were driving it?
how it happened may help find the problem.
how old is the fuel? and has the vette been sitting where someone could have added evil tiding's to the gastank?
whats the details of how this happened? did it start up one morning, run for a little and die? die while you were driving it?
how it happened may help find the problem.
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Joined: Dec 2002
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From: Sparta MI
Re: mechanic's HELP!! Engine wont staRT (ol,RJ)
gas is good its been in my garage for 2 years: its an 87 motor i swaped out the crossfire motor for a tpi motor out of an 87 the motor i bough came with all the harness attached to the motor still and the ecm came with it!
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Melting Slicks
Joined: Feb 2002
Posts: 2,699
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From: The Black Hole LA
Re: mechanic's HELP!! Engine wont staRT (inmy84vette)
I am not sure about 84's but on TPI units there is an electrical plug behind the distributor. I think it is like 4 wires. This sends the signal to the injectors to pulse and spray fuel. If it is hooked up and the fuse is good you can also get a tester node for the injector electrical plugs. Not that expensive or your shop should have one as well if they are any good. You unplug the electrical plug from the injector and plug the node(looks like a little light bulb) into the electrical plug. Turn the car over and the node should light up. If it does not the you have no signal and you have a wiring problem.
BTW on the TPI that 4 wire plug that I was talking about is easy to put in backwards if the clip has broken off of it. Been there done that.
Let us know what you find. Same thing happenned to me. After I got the plug thing straightened out it still wouldn't run. Come to find out that my timing was way off and I had the vacuum line for the FPR swapped with one that goes to the front of the motor to some polution air thingy. This is all for TPI though, I assume you have an 84 crossfire from your forum name.
BTW on the TPI that 4 wire plug that I was talking about is easy to put in backwards if the clip has broken off of it. Been there done that.
Let us know what you find. Same thing happenned to me. After I got the plug thing straightened out it still wouldn't run. Come to find out that my timing was way off and I had the vacuum line for the FPR swapped with one that goes to the front of the motor to some polution air thingy. This is all for TPI though, I assume you have an 84 crossfire from your forum name.
Drifting
Joined: Aug 2000
Posts: 1,316
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From: Houston, TX
Re: mechanic's HELP!! Engine wont staRT (jfb)
do you have the compete 87wiring harness from the computer all the way out? the polarity on the 84 dist is different from the tpi cars? If you have the 4 prong plug from an 84 and the dist is 85 up, you have a problem there or if you have a distributor for an 84 that may be the problem
