1985 c4
Thread Starter
Heel & Toe
Joined: Sep 2015
Posts: 23
Likes: 0
1985 c4
85 Starts then dies 2 secs. later
what I have done
cleaned gas tank
cleaned sending unit
new tune up
new fuel filter
new pick up coil for distributor
new iavc
new throttle body gasket
new the maf sensor
brand new radiator
new thermostat and gasket
new relay for cooling fan
can anyone help
what I have done
cleaned gas tank
cleaned sending unit
new tune up
new fuel filter
new pick up coil for distributor
new iavc
new throttle body gasket
new the maf sensor
brand new radiator
new thermostat and gasket
new relay for cooling fan
can anyone help
Drifting
Joined: Mar 2013
Posts: 1,952
Likes: 239
From: Venice Cali.
I have never had this problem, but I have read that if the oil pressure sender is bad it will turn off the engine for safety. It is located behind the distributor on a stem. 1 of them send signals to the fuel pump that oil pressure is ok. I replace them both right away so they would not give me a problem plus they were leaking oil all over. Other than that I cannot imagine why the 85(no vats ) would start and shutdown. Check and clean connectors on the thing next to the blower motor for ac on pass side as it is some kind of spark module. Clean connectors in general that is what I did and have not had a problem in over a year good luck.
One other thing a bad fuel pump could start then stop.
One other thing a bad fuel pump could start then stop.
Last edited by xrav22; Sep 7, 2015 at 09:43 PM.
Thread Starter
Heel & Toe
Joined: Sep 2015
Posts: 23
Likes: 0
thank you
I have never had this problem, but I have read that if the oil pressure sender is bad it will turn off the engine for safety. It is located behind the distributor on a stem. 1 of them send signals to the fuel pump that oil pressure is ok. I replace them both right away so they would not give me a problem plus they were leaking oil all over. Other than that I cannot imagine why the 85(no vats ) would start and shutdown. Check and clean connectors on the thing next to the blower motor for ac on pass side as it is some kind of spark module. Clean connectors in general that is what I did and have not had a problem in over a year good luck.
One other thing a bad fuel pump could start then stop.
One other thing a bad fuel pump could start then stop.
Melting Slicks
Joined: Mar 2001
Posts: 2,149
Likes: 303
From: Timra, Sweden
It sounds like a fuel problem. Can you hear the fuel pump priming when you switch the ignition on? You can manually run the fuel pump from a pin on the ALDL connector.
You can also add a temporary fuel pressure gauge to the fuel valve. Use the schrader valve on the fuel rail to connect the gauge.
Nr 26
You can also add a temporary fuel pressure gauge to the fuel valve. Use the schrader valve on the fuel rail to connect the gauge.
Nr 26
Thread Starter
Heel & Toe
Joined: Sep 2015
Posts: 23
Likes: 0
It sounds like a fuel problem. Can you hear the fuel pump priming when you switch the ignition on? You can manually run the fuel pump from a pin on the ALDL connector.
You can also add a temporary fuel pressure gauge to the fuel valve. Use the schrader valve on the fuel rail to connect the gauge.
Nr 26
You can also add a temporary fuel pressure gauge to the fuel valve. Use the schrader valve on the fuel rail to connect the gauge.
Nr 26
when starting fuel psi is 45 and when running 40 to 42
Thread Starter
Heel & Toe
Joined: Sep 2015
Posts: 23
Likes: 0
I have never had this problem, but I have read that if the oil pressure sender is bad it will turn off the engine for safety. It is located behind the distributor on a stem. 1 of them send signals to the fuel pump that oil pressure is ok. I replace them both right away so they would not give me a problem plus they were leaking oil all over. Other than that I cannot imagine why the 85(no vats ) would start and shutdown. Check and clean connectors on the thing next to the blower motor for ac on pass side as it is some kind of spark module. Clean connectors in general that is what I did and have not had a problem in over a year good luck.
One other thing a bad fuel pump could start then stop.
One other thing a bad fuel pump could start then stop.
oil pressure is ok. no leaking oil all over clean
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Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
You can prove to yourself that the oil pressure switch is not "protecting" the engine by unplugging its connector. The engine will start and run just fine.
Drifting
Joined: Jun 2013
Posts: 1,590
Likes: 60
From: ft myers FL/Munising MI
If you've had the fuel pump out, check to make sure the hose isn't blowing off the pulsator, check the pressure pressure with key on and make sure it stays up, if it falls right away, the hose is coming off the pulsator ....happened to me, same symptoms....
Thread Starter
Heel & Toe
Joined: Sep 2015
Posts: 23
Likes: 0
replace the fuel pressure reg and now the fuel is going up and down
Drifting
Joined: Jun 2013
Posts: 1,590
Likes: 60
From: ft myers FL/Munising MI
Is it going up and down with the key on and engine off?....pressure should go to 38 in 2 sec and remain there for awhile.....then slowly drop over 20 min or so....if not, then you have a loose line somewhere above the fuel pump to the pulsator probably, it slips out at pressure and back in when pressure drops.....you can also pinch off the return line to the tank when pressurized and make sure it holds....test for your pressure reg....good luck...keep trying, you'll find what it is.....Paul
Thread Starter
Heel & Toe
Joined: Sep 2015
Posts: 23
Likes: 0
Is it going up and down with the key on and engine off?....pressure should go to 38 in 2 sec and remain there for awhile.....then slowly drop over 20 min or so....if not, then you have a loose line somewhere above the fuel pump to the pulsator probably, it slips out at pressure and back in when pressure drops.....you can also pinch off the return line to the tank when pressurized and make sure it holds....test for your pressure reg....good luck...keep trying, you'll find what it is.....Paul
when I pinch off the return what should happen
Thread Starter
Heel & Toe
Joined: Sep 2015
Posts: 23
Likes: 0
Is it going up and down with the key on and engine off?....pressure should go to 38 in 2 sec and remain there for awhile.....then slowly drop over 20 min or so....if not, then you have a loose line somewhere above the fuel pump to the pulsator probably, it slips out at pressure and back in when pressure drops.....you can also pinch off the return line to the tank when pressurized and make sure it holds....test for your pressure reg....good luck...keep trying, you'll find what it is.....Paul
when I pinch off the return what should happen