Deputy739

I have a 1986 f150 302 efi getting spark and correct fuel pressure, still won't start. It started out with a single miss at idiling, the I noticed that it was missing more and more. It finally just stopped running. I connected the scanner to check for codes, but when I turn the key on, the scanner turns off. Any ideas? Thanks

Chris_1

iTrader: (1)

Maybe the TPS. About feb 22 I posted "testing the tps". Worth checking anyway.

Deputy739

I already replaced that, besides its not even firing at all

504'd

Was it running well before? If you have spark, how do the plugs look? What is your fuel pressure? If you have good spark, I would guess lean misses? Clogged injectors?

JayzDaddy

Pick up coil in the distributor (also called stator ).

Matthew Burr

fuel spark and air

could be any number of the things listed

have you checked the idle air control valve?

Chris_1

iTrader: (1)

Actually, it's air/fuel mix, spark and timing. If you have those 3 it goes. Take 1 out it doesn't.
The reason I suggested testing the TPS is that (1) new ones can be bad right out of the box, and (2) if it's not adjusted right, it can shut off the injectors.
If you're sure you have a spark, you will have to test the injectors and make sure they're actually opening.
You can bypass the fuel system to see if that's the problem with starting fluid. A 3 second burst straight into the throttle body with the plates open then go turn the key.
If it fires with starting fluid but not regular, then you're not getting fuel. If it doesn't it's something else (which, if you have spark and fuel, next would be timing).

504'd

Chris, out of curiosity because I've never heard it before, what would cause the ecu to sometimes shut off the injectors? I know the tps works in a range and if it's out, you'll get a bad mix, but I didn't think it had that much reach.

But that got me thinking, Deputy, you should check the fuel kill switch. The one that shuts the fuel off in case of a collision.

Deputy739

Well, it's not the distributor. I replaced it with a brand new one. I poured gas in the throttle body and it still won't hit a lick. Any more ideas?

Deputy739

I checked the Enertia switch and it's ok