87 ford 150 w/302 fuel inj cranks on starter fluid and runs great but won't crank without it

40

Asked by May 16, 2013 at 10:27 PM about the 1987 Ford F-150 STD Standard Cab LB

Question type: Maintenance & Repair

Replace plugs wires exc.

9 Answers

27,835

if it runs on starting fluid and doesnt without it. your not gettin fuel. you are obviously getting spark since it runs when you introduce a fuel source.

2 of 2 people found this helpful.
40

Fuel is getting to rail

27,835

I see I didnt catch that you said it stays running once started with fluid. Thats my bad. pop the fuel rail up and see if the injectors are opening when someone cranks the truck.

Best Answer
40

Just not cranking acts like injector #1not opening on crank up is their a sensor or a relay for this?

1 of 1 people found this helpful.
40

If injector doesn't open and has 30 psi on fuel rail then what should I look for?

1 of 1 people found this helpful.
27,835

It may not being seeing rpm for some reason when cranking. the computer grounds them. I just dont know why it would work once running. You could check the tps sensor. I have seen on a chevy one time it thought it was at wide open throttle and it wouldnt spray fuel. clear flood mode I think it was called.

40

There are no codes on when it is running or cranking that should throw a code in flood mode open loop good idea though I have seen the same how did you reset it?

40

It runs perfect idle perfect good responce runs for hours until you cut it off then won't crank up and run until you shoot some fluid in it it's got me.

2 of 2 people found this helpful.
27,835

I replaced the tps sensor and fixed it on that one.

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