1995 f 150 won't start when hot
#1
1995 f 150 won't start when hot
Working on a 1995 f 150 with a 302 that has fuel and spark and cranks fine but won't start when the engine is warm. Let it sit for 1 hour and it will start and run fine till you shut it off and it won't start again.It has good spark so it doesn't appear to be a coil or pick up but if I'm wrong please let me know. Acts like a vapor lock but I haven't seen this happen in years. Not after fuel injection.
If anyone has had this or anything that you would check that I haven't please let me know.
Thanks Rick
If anyone has had this or anything that you would check that I haven't please let me know.
Thanks Rick
#2
#3
Originally Posted by redman007
Working on a 1995 f 150 with a 302 that has fuel and spark and cranks fine but won't start when the engine is warm. Let it sit for 1 hour and it will start and run fine till you shut it off and it won't start again.It has good spark so it doesn't appear to be a coil or pick up but if I'm wrong please let me know. Acts like a vapor lock but I haven't seen this happen in years. Not after fuel injection.
If anyone has had this or anything that you would check that I haven't please let me know.
Thanks Rick
If anyone has had this or anything that you would check that I haven't please let me know.
Thanks Rick
Does this vehicle have aftermarket exhaust manifolds/headers? Big block chevys have this problem too. The radiant heat from the manifolds cooks the starter. Truck will not fire back up until the motor cools off.
Make sure your exhaust heat is avoiding your starter. You might consider installing some sort of heat shield around your starter and/or manifolds. Or find a more robust starter....
Hope this helps
Mike
#4
#6
Originally Posted by redman007
Starter isn't the problem.
Originally Posted by redman007
It cranks over fine.
Again...make sure your starter isn't cooking. Or the terminal from the battery to the starter is solid.
#7
think it's mabey in the fuel pump? i have a 94 taurus 3.0 and lately it quits on hot days, put in a gallon of gas from the jerry can and it starts right up. i've been told it's the diaphram in the fuel pump's getting weak, and the hot gasoline amplify's the problem, then the cool gas i put in cools it. anyone else heard of this? neighbor's 91 chev 1ton has a tbi 454 and he said it did the same thing before putting in a new pump. i dunno.
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#9
Thanks for thr ideas.. The cables and the starter are ok, It cranks the same cold as it does hot... Adding fuel doesn't help either.(willing to try anything) Haven't got to the temp sending unit yet but thats next on the list. Anymore ideas please let me know and i will check them also.
Thanks Rick
Thanks Rick
#10
#12
#13
Have you ever pulled one of the plugs out when it throws this fit to see if it is wet with fuel or not? If you are sure you have good fire during this time then it almost has to be coming from the fuel system. A quick fuel pressure check during this could also be useful since on a fuel injection system can have fuel pressure and still not fire the injectors. The fuel pressure check will tell you if it is the pump or not also. I think one of the guys on here said once that it should carry 30# of pressure just turning on the key, not running. Not knowing exactly what the computer is looking at to start the engine that is about all I know of to look at right now. Does anyone know if there is a delay in the system looking for oil pressure? When the oil is hot it doesn't have as much oil pressure.
#14
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