3-4 seconds and dies
Thread Starter
Drifting
Joined: Feb 2000
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From: Crystal lake Il
2022 Corvette of the Year Winner -- Modified
2021 C4 of the Year - Modified Winner
3-4 seconds and dies
Well I fixed the trans issue, then went to start it.....3-4 seconds and dies, I hear the fuel pump, have spark...think its the TPS. Any other ideas? No codes
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
The ECM powers the fuel pump for 2 seconds when you turn on the ignition.
After that the ECM turns on the fuel pump when it sees distributor reference pulses.
If the fuel pump relay fails, the oil pressure switch (in parallel) will power the fuel pump.
Also look at wiring and fuses.
After that the ECM turns on the fuel pump when it sees distributor reference pulses.
If the fuel pump relay fails, the oil pressure switch (in parallel) will power the fuel pump.
Also look at wiring and fuses.
Last edited by Cliff Harris; Oct 20, 2011 at 11:05 PM. Reason: Corrected wrong information
Thread Starter
Drifting
Joined: Feb 2000
Posts: 1,917
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From: Crystal lake Il
2022 Corvette of the Year Winner -- Modified
2021 C4 of the Year - Modified Winner
fuses are fine, checked those, will look at oil pressure...only reason I am thinking TPS is when I moved it the car ran...although poorly. The TPS sets up against the intercoolers very closely and I have removed those to check a few things.....odd that I did not have the issue before.
I will check oil pressure reading on dash
suddenly the LT-5 seems like such a simple motor to work on
I will check oil pressure reading on dash
suddenly the LT-5 seems like such a simple motor to work on
Drifting
Joined: Dec 2007
Posts: 1,647
Likes: 4
From: Argillite KY
Hi Lee, What kind of Vette do you have? The TPS will usually still allow the car to run, although poorly. It does sound like an oil pressure issue but it could be a bunch of other stuff. Car make and model please. Thanks and have a great day.
Burning Brakes
Joined: May 2011
Posts: 838
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From: Louisville Ky
The ECM powers the fuel pump for 2 seconds when you turn on the ignition. After that the oil pressure switch supplies power to the fuel pump. It's next to the distributor on the driver's side. The oil pressure sender for the instrument panel is teed off of the same place.
If the oil pressure switch is not doing its job the engine will run off the fuel in the rails from the initial pressurization and then die when there is no more fuel. Also look at wiring and fuses.
If the oil pressure switch is not doing its job the engine will run off the fuel in the rails from the initial pressurization and then die when there is no more fuel. Also look at wiring and fuses.
the clue here is 3 secs. with fuel rails the engine will run for 15 secs or longer.
can unhook tps and also MAP sensor if it has one, car should run. sounds like the injectors are not firing, may be shorted injector or wire. the short will cause ECM to shut down injectors.
you can check it by pulling one FI fuse, crank, reinstall, then the other. or one fi plug at a time, or ohm them to see if one is low.
***I have NO idea how the callaway system works, but it is FI. my be similar.
Last edited by joe paco; Sep 4, 2011 at 10:29 AM. Reason: new info from OP
Thread Starter
Drifting
Joined: Feb 2000
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From: Crystal lake Il
2022 Corvette of the Year Winner -- Modified
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Callaway is a TPI system with what is called a microfueler...when turbos tip in to injectors in front of the TB spray in extra fuel...there are run off of a separate control unit. Other than that its pretty much stock TPI...
Thread Starter
Drifting
Joined: Feb 2000
Posts: 1,917
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From: Crystal lake Il
2022 Corvette of the Year Winner -- Modified
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There is a fuel smell(as in its going in) would test pressure but could not find the valve....fuel rail is alittle different
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Thread Starter
Drifting
Joined: Feb 2000
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From: Crystal lake Il
2022 Corvette of the Year Winner -- Modified
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wiggled the inj wires and tapped the IAC, started....woo hoo thanks...just need to figure out which one it was; IAC going to be replaced
Drifting
Joined: Dec 2007
Posts: 1,647
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From: Argillite KY
There's nothing worse than an unreliable Corvette. The next time the Callaway screws up I'll drive up there and swap you my fine 95 Vert for it. Mine has always been reliable. I'll even take the responsibility for getting that blown POS to Kentucky. Just a suggestion.......or not.
Burning Brakes
Joined: May 2011
Posts: 838
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From: Louisville Ky
one clue it to listen to it shut of, a suffocating, gasping sound -fuel starvation- or 'turn the key off' -which is immediate.
ICM is a likley cause, but so are at least 12 others.
joe
Thread Starter
Drifting
Joined: Feb 2000
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From: Crystal lake Il
2022 Corvette of the Year Winner -- Modified
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Too many projects right now:
building a 530+hp LT-5(spare) for my 90 ZR-1
87 Callaway: nickel and dime stuff
92 ZR-1: running good, just fixed and oil leak from the header
but can't complain life has been good to me...
Wife would like to see them all go
building a 530+hp LT-5(spare) for my 90 ZR-1
87 Callaway: nickel and dime stuff
92 ZR-1: running good, just fixed and oil leak from the header
but can't complain life has been good to me...
Wife would like to see them all go
Burning Brakes
Joined: May 2011
Posts: 838
Likes: 2
From: Louisville Ky
next time it does it keep it above idle. if it is iac should die when you drop back rpm. never saw a thread where the iac was identified as the problem for a 3 sec engine run -assuming it shut off without chugging and gasping. with the c4 it is possible, I am sure.
Melting Slicks
Joined: Nov 2008
Posts: 2,765
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There's nothing worse than an unreliable Corvette. The next time the Callaway screws up I'll drive up there and swap you my fine 95 Vert for it. Mine has always been reliable. I'll even take the responsibility for getting that blown POS to Kentucky. Just a suggestion.......or not.
Give my left nut & my sac for that 87 Callaway TT.
Thread Starter
Drifting
Joined: Feb 2000
Posts: 1,917
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From: Crystal lake Il
2022 Corvette of the Year Winner -- Modified
2021 C4 of the Year - Modified Winner
only paid $11K.......there is a 88 vert on ebay for no reserve, buy it now @$14K I believe, cheap....
Thread Starter
Drifting
Joined: Feb 2000
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From: Crystal lake Il
2022 Corvette of the Year Winner -- Modified
2021 C4 of the Year - Modified Winner
Now is the time to buy, bought a 90 ZR-1 for 10.5 and the Callaway for 11K...thats over 700hp for 21.5
Thread Starter
Drifting
Joined: Feb 2000
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From: Crystal lake Il
2022 Corvette of the Year Winner -- Modified
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Well, its not the IAC......replaced and still the same issue. I took a test light to the injector harness there is power there with the key on....
Any thoughts? not sure were shraeder valve is on the Callaway, tweaked the stock rail..
I am getting a spark signal with a test light on plug wire #1....
hmmmmmmm
Any thoughts? not sure were shraeder valve is on the Callaway, tweaked the stock rail..
I am getting a spark signal with a test light on plug wire #1....
hmmmmmmm