Fuel problem corvette 1984
Thread Starter
Heel & Toe
Joined: Feb 2011
Posts: 21
Likes: 0
From: Mayaguez Puerto Rico
Fuel problem corvette 1984
Hi all
my corvette 1984 (crossfire) runs for a while good an hour or so,suddenly stalls and shut off,start cranking but not fuel on injectors, let it set for a while 15 minutes or so and start again with some issues but later no problem,change almost everything
please let me know
my corvette 1984 (crossfire) runs for a while good an hour or so,suddenly stalls and shut off,start cranking but not fuel on injectors, let it set for a while 15 minutes or so and start again with some issues but later no problem,change almost everything
please let me know
Thread Starter
Heel & Toe
Joined: Feb 2011
Posts: 21
Likes: 0
From: Mayaguez Puerto Rico
I forgot to mention that when this happens I take off the air cleaner and see the showers pulsing gas but not full just when the motors cranks,also the fuel pump fuse is very hot close to melt.
Burning Brakes
Joined: Feb 2013
Posts: 1,173
Likes: 152
From: norway
Pro
Joined: Jan 2003
Posts: 706
Likes: 47
From: Denver Colorado
I have seen problems like this caused by a bad ignition module and also by a bad fuel tank cap. The ignition module can fail intermittently when it gets hot, no spark or no engine turning (Tach) signal so no fuel from injectors. There is a test light for those injectors that you can plug into each pigtail and see if the ECM is commanding a pulse. Also, a plugged up fuel tank cap can result in a vacuum in the tank that the fuel pump can not move fuel against. Next time it quits open the tank and see if you get a woosh of ingoing air then try re-starting right away.
My bet is bad module in the distributor or no thermal (heat sink) grease when the current one was put in. Good luck!
My bet is bad module in the distributor or no thermal (heat sink) grease when the current one was put in. Good luck!
Thread Starter
Heel & Toe
Joined: Feb 2011
Posts: 21
Likes: 0
From: Mayaguez Puerto Rico
I will check the cap next time,but meanwhile will work with the grease on the module,it is any specific one? where it is applied?
thanks 1984z51auto
will let you know any news
thanks 1984z51auto
will let you know any news
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Burning Brakes
Joined: Jul 2013
Posts: 1,027
Likes: 30
From: Granite City Illinois
Electrical resistance will cause heat like that.
Pro
Joined: Jan 2003
Posts: 706
Likes: 47
From: Denver Colorado
The grease I was talking about is a heat sink compound that should go between the module base and the body of the distributor body when the module is installed. I think that auto parts stores have it in tubes as di-electric grease. The purpose is to improve the heat transfer from the module to the distributor body so the module stays cooler. New modules usually have a little packet with a daub of it included. Hope I didn't cause more confusion than I relieved.
Burning Brakes
Joined: Jul 2013
Posts: 1,027
Likes: 30
From: Granite City Illinois
Get a new fuse make sure the fuse socket is clean and its not loose fitting.
Poor electrical contact causes resistance, resistance with current passing through causes heat by lost voltage. The voltage times the current equals power in watts. Power is dissipated as heat. That heat means you are losing voltage to the load (the fuel pump).
When it cools down car runs again?
Wont hurt to use some electrical cleaner for switches and contacts on that socket. If its very bad from the heat already it might take serious cleaning or replacing.
Poor electrical contact causes resistance, resistance with current passing through causes heat by lost voltage. The voltage times the current equals power in watts. Power is dissipated as heat. That heat means you are losing voltage to the load (the fuel pump).
When it cools down car runs again?
Wont hurt to use some electrical cleaner for switches and contacts on that socket. If its very bad from the heat already it might take serious cleaning or replacing.
Thread Starter
Heel & Toe
Joined: Feb 2011
Posts: 21
Likes: 0
From: Mayaguez Puerto Rico
Hi All
past week (thursday)I got the grease and applied, yesterday (saturday) took it for a spin 1 1/2 hour more or less with out any hesitation (finally) but getting close to home the motor start failing and I thought that could be the spark plugs put it in the garage until next day (today) and crank it and start again with out any problem runs like 1/2 hour with out any problem and stop for another hour or so,when crank to start it did not send gas again on the showers,check the gas cap and no "Swoosh" sound on it like vacuum,pull out the fuses (inj 1 and 2, ECM and fuel pump) to reset but nothing,keep cranking until start but failing like spark plugs or poor gas, let it for a while iddle and not shutting it off,until it went off, let it for a while 1/2 or so and crank again start failing and trembling but running, I keep it gas and brake for a while until finishing stopping,I got home with gas and brake and the motor failing and stumble.
any thoughts?
past week (thursday)I got the grease and applied, yesterday (saturday) took it for a spin 1 1/2 hour more or less with out any hesitation (finally) but getting close to home the motor start failing and I thought that could be the spark plugs put it in the garage until next day (today) and crank it and start again with out any problem runs like 1/2 hour with out any problem and stop for another hour or so,when crank to start it did not send gas again on the showers,check the gas cap and no "Swoosh" sound on it like vacuum,pull out the fuses (inj 1 and 2, ECM and fuel pump) to reset but nothing,keep cranking until start but failing like spark plugs or poor gas, let it for a while iddle and not shutting it off,until it went off, let it for a while 1/2 or so and crank again start failing and trembling but running, I keep it gas and brake for a while until finishing stopping,I got home with gas and brake and the motor failing and stumble.
any thoughts?
Pro
Joined: Jan 2003
Posts: 706
Likes: 47
From: Denver Colorado
I didn't think of that angle... my Cross-Fire had a Weiand EGR Block Off Plate - Part# 9007 in place of the valve and I never missed the darn thing!
You can actually make that valve move manually by squeezing the diaphragm up from the bottom by hand when its cold or by using a vacuum pump on the fitting on the valve, assuming the valve is good. Not sure that one sticking open would kill the engine... might make it run really poorly however??
You can actually make that valve move manually by squeezing the diaphragm up from the bottom by hand when its cold or by using a vacuum pump on the fitting on the valve, assuming the valve is good. Not sure that one sticking open would kill the engine... might make it run really poorly however??
2nd Gear
Joined: Feb 2015
Posts: 2
Likes: 0
Likely Ignition Control Module
As the Ignition Control Module gets worn, a typical symptom is car will stall and not be able to start for 30 to 45 minutes of cooling. Then will restart like nothing ever happened.
I replaced mine with an AC Delco or BWD from Oreillys recently <$30 and are in stock there. Do add the grease under module and a tad on contacts.
That should do the trick.
I replaced mine with an AC Delco or BWD from Oreillys recently <$30 and are in stock there. Do add the grease under module and a tad on contacts.
That should do the trick.
Thread Starter
Heel & Toe
Joined: Feb 2011
Posts: 21
Likes: 0
From: Mayaguez Puerto Rico
Ok
I will get a new module during the weekend and will try,I have a question do the resistor on the pump could be worn out or burn?because the main problem is no fuel when it is hot,this time the temperature runs on the 180s or 190s all the time.
I will get a new module during the weekend and will try,I have a question do the resistor on the pump could be worn out or burn?because the main problem is no fuel when it is hot,this time the temperature runs on the 180s or 190s all the time.
Pro
Joined: Jan 2003
Posts: 706
Likes: 47
From: Denver Colorado
As the Ignition Control Module gets worn, a typical symptom is car will stall and not be able to start for 30 to 45 minutes of cooling. Then will restart like nothing ever happened.
I replaced mine with an AC Delco or BWD from Oreillys recently <$30 and are in stock there. Do add the grease under module and a tad on contacts.
That should do the trick.
I replaced mine with an AC Delco or BWD from Oreillys recently <$30 and are in stock there. Do add the grease under module and a tad on contacts.
That should do the trick.
Yeah, what he said.
Thread Starter
Heel & Toe
Joined: Feb 2011
Posts: 21
Likes: 0
From: Mayaguez Puerto Rico
Hi All
today started and runs great changed the Ignition module put grease and clean contacts, took it for a spin and in less than fifteen minutes start failing again, motor shuts off and no gas on the showers, took off the injectors, ecm and fuel pump fuses and start again but failing, took it home and let it in the garage, tomorrow will check fuel pump, but anyone has any idea what could be happening?
today started and runs great changed the Ignition module put grease and clean contacts, took it for a spin and in less than fifteen minutes start failing again, motor shuts off and no gas on the showers, took off the injectors, ecm and fuel pump fuses and start again but failing, took it home and let it in the garage, tomorrow will check fuel pump, but anyone has any idea what could be happening?