85 302 issues, need help.
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Senior User
Joined: Apr 2008
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From: Michigan
85 302 issues, need help.
Can anyone help me on this problem?
My 85 f150 with a 302 efi will start right up when cold, but when it is warm (after driving it for awhile), it does not like to start back up. It usually just keeps cranking for a long while. Is it the coil?
My 85 f150 with a 302 efi will start right up when cold, but when it is warm (after driving it for awhile), it does not like to start back up. It usually just keeps cranking for a long while. Is it the coil?
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
Could be a lot of things. Do you hear the fuel pumps cycle on the warm start? If it does it would be a good idea to check the fuel presure at the rail, your truck has both an in-tank low pressure pump and and external high pressure pump, if either of these are not startiing up right away you won't get full pressure and the motor won't light very quickly.
New User
Joined: Sep 2008
Posts: 13
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From: Cornwall, Pa
On the multi-port EFI, I have seen heat soaked idle air control valves stick and cause this. If it is starting fine cold, the pressure regulator is probably OK and holding pressure. Like Conanski says it would be a good idea to check fuel pressure and make sure there is enough residual pressure there when warm before starting.
Thread Starter
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Senior User
Joined: Apr 2008
Posts: 266
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From: Michigan
Could be a lot of things. Do you hear the fuel pumps cycle on the warm start? If it does it would be a good idea to check the fuel presure at the rail, your truck has both an in-tank low pressure pump and and external high pressure pump, if either of these are not startiing up right away you won't get full pressure and the motor won't light very quickly.
Thread Starter
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Senior User
Joined: Apr 2008
Posts: 266
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From: Michigan
On the multi-port EFI, I have seen heat soaked idle air control valves stick and cause this. If it is starting fine cold, the pressure regulator is probably OK and holding pressure. Like Conanski says it would be a good idea to check fuel pressure and make sure there is enough residual pressure there when warm before starting.
I will check it when i get it out in the spring, unless i figure out it is something else.
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From: Michigan
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New User
Joined: Sep 2008
Posts: 13
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From: Cornwall, Pa
Maybe, or could be clogged fuel filter. But realistically if it runs fine that is probably all OK. From my experience, your starting problem is usually either a failing coolant temperature sensor or sticky IAC valve.
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From: Easton,Ks
Also check the coils plug I have seen these plugs give a lot of problems.
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From: Michigan
If i give it a little bit of gas, it will fire, but will run like crap until i get it movin.
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Senior User
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From: Michigan
I will have to take a look at those soon.
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From: Easton,Ks
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