I have a 1990 F150 5.0 that has fuel pressure (new pump), spark but will not start (new computer). Will try to start with starting fluid. So it appears the injectors are not pulsing. any ideas?
I have a 1990 F150 5.0 that has fuel pressure (new pump), spark but will not start (new computer). Will try to start with starting fluid. So it appears the injectors are not pulsing. any ideas?
Any codes? What happened the first time? What's your fuel pressure?
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No codes. Only for sure known previous problem was bad fuel pump. Not my diagnosis though. Fuel pressure is around 45psi and holds while cranking.
Hmmmmm, It could be a module, but then usually, you don't have spark. Fuel pressure spec is 35-45 so your good there. Will it stay running was you use ether or does it die right away?
Who changed the computer?
1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS!
1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
2004 GSW TDI, 5 speed, fully loaded, modified.
Aurora ignition wires for sale. Link to info
Super60 roller cams or custom/billet cams. Link to info
I changed the computer due to research pointing at that. I am considering the module. But does that have anything to do with the injector pulse? Both leads at the injector (s) have voltage.
Ok, that's an issue, only one lead should have power, the other is a ground. So you have a computer issue or wiring.
1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS!
1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
2004 GSW TDI, 5 speed, fully loaded, modified.
Aurora ignition wires for sale. Link to info
Super60 roller cams or custom/billet cams. Link to info
well if the computer is bad causing no start the fuel pump will keep running with the key on... i mean it will not come out of self prime mode...
the problem with the computer is actually 3 capacitors that start to leak and eat the leads off of the capacitors
but that might be just the 6 cyls...
The fuel pump cycles like it is supposed to do. I agree on both leads at the injectors being hot as a problem. Sounds like a ground has been lost?
Ok, lets start from the beginning. What happened to start this diagnosis?
1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS!
1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
2004 GSW TDI, 5 speed, fully loaded, modified.
Aurora ignition wires for sale. Link to info
Super60 roller cams or custom/billet cams. Link to info
What I was told is that the truck quit running. That was a few years ago. The previous people working on it (shade tree) felt like the pump was the reason for it to quit running. Of course after sitting for awhile the pump was certainly bad. The previous people installed a new pump/cleaned out the tank but no start. It has 45 psi on the fuel rail. Pump sounds good and cycles normally. Has spark from the coil to distributor cap, but no start! Injectors will not pulse. i installed new computer thinking/hoping that would solve the issue,no luck! The best I can tell,the relays are good. Both leads at injector has voltage. So the injectors are not being grounded and therefore won't pulse! WHY?Originally Posted by turbovanmanČ
It sounds more like one of the leads is shorted to power vs being grounded. There should only be power on one side of the injector. What are you using g to check for power dim or test light? Is the multi point injection?
Last edited by RattFink; 11-11-2014 at 07:53 AM.
I used a test light. But I plan on breaking out the voltmeter today. If one lead is not grounded on the injector then both leads will have power showing even if only supplying power to one of side the injector leads.
Yes if the injector is still plugged in while you are checking.
It was.
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I'm gonna check the TPS voltage and see if that is okay. It has been brought up as a problem if it shows WOT will cranking.
Checked TPS. 5v going in 1.1v showing on the output. So no problem there. I disconnected 1 injector lead. Still shows batt. voltage on both leads. Would the other injectors still being hooked up have an effect on that reading? Did i mention I hate working on Fords! LOL
Does this truck have a crank sensor?
No. Not that I'am aware of.
Does the check engine light stay on while you are cranking the engine over?
[QUOTE=RattFink;1061912]Does the check engine light stay on while you are cranking the engine over?[/QUOTE
It will go out when cranking.
I think the injectors are bank fired so each bank shares a power and ground. Ford service info doesn't go back to 1990 so I was looking at a 1992 but should be the same. Ford interprets crank rpm from the distributor and it is called a PIP signal. It uses pip to fire injectors. During cranking the engine light shuts off as soon as pip is received by the pcm
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