Truck won't start
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New User
Joined: Jul 2003
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From: California
Truck won't start
The truck is a 1990 4X4 F-250 FI 302 Automatic. The truck was recently purchased on a salvage title and has not been running for an indeterminate amount of time. When I got the truck the Pip sensor, Map sensor and Coil connector were missing. Replaced the Pip, Map, and connector from salvage vehicles. (did Ford make different Pip sensors for differnt motors? 302 vs 351w) Truck cranks, oil pressure and fuel pressure are evident.
Every once in awhile the truck starts, runs smooth, cuts out, runs smooth, backfires through airbox, shuts off (longect it has run is about 15 seconds). Almost sounds like it is running out of gas. Have check initial timing, Pip sensor, both good. Have only seen check engine light on one time and no codes available. Starting to think this is an intermitent electrical noid.
Any ideas?
Every once in awhile the truck starts, runs smooth, cuts out, runs smooth, backfires through airbox, shuts off (longect it has run is about 15 seconds). Almost sounds like it is running out of gas. Have check initial timing, Pip sensor, both good. Have only seen check engine light on one time and no codes available. Starting to think this is an intermitent electrical noid.
Any ideas?
Posting Guru
Joined: Dec 2002
Posts: 1,297
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From: Billings MT
Truck won't start
I would have to second the fuel filter. It's probably got junk in it that is clogging the output when the fuel starts going through it.
For $8-12 replace it. It is easy and about a 5 minute job.
Or it could be that there is junk in the tank and it is cloggin the screen on the pumps. Does it do it with both tanks? If you have dual tanks, that will tell you where the problem is.
For $8-12 replace it. It is easy and about a 5 minute job.
Or it could be that there is junk in the tank and it is cloggin the screen on the pumps. Does it do it with both tanks? If you have dual tanks, that will tell you where the problem is.
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New User
Joined: Jul 2003
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From: California
Truck won't start
Was planning fuel filter change along with cap rotor and wires. Front tank pump inop. (Like most Ford trucks one of the pumps no workie) Back tank pump is good. Checked fuel at rail, smell like good gas, taste like good gas kemosobie. I put 5 gallons of priemium into an almost empty tank, should have sufficient dilution old to new. Will take sample and check for contamination when doing filter.
Will keep you posted
Will keep you posted
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New User
Joined: Jul 2003
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From: California
Truck won't start
Changed filter Still no work. With Key on engine off the fuel pump will run constantly sometimes and the #5 injector chatters. Turn the key off and then back on the fuel pump cycles and stops no injector chatter. EEC kicks out code 11, all is well. ????? Battery is 12 volts.
Fuel seems O.K. Re-checked timing. Cranks no start.
HELP!!! any idea is a good one at this point
Fuel seems O.K. Re-checked timing. Cranks no start.
HELP!!! any idea is a good one at this point
Posting Guru
Joined: Dec 2002
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From: Billings MT
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Thread Starter
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New User
Joined: Jul 2003
Posts: 12
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From: California
Truck won't start
Checked the fuel pump relay. No problems. EEC-IV getting voltage from starter circuit, and power is going through relay to EEC. Still seems wierd that sometimes the EEC seems to function and other times it won't. Checked all the grounds (3) across the back of the firewall, all good.confused:
Pulled the distributer AGAIN! set static timing at zero degrees TDC. moved the housing to about 5-8 degrees BTC as an initial starting point (used my bionic eye to calibrate degrees LOL). Even at TDC truck refuses to fire.:
Noticed some arc marks on the spark plug wires so am thinking maybe spark is grounding before the plug.
Pulled the distributer AGAIN! set static timing at zero degrees TDC. moved the housing to about 5-8 degrees BTC as an initial starting point (used my bionic eye to calibrate degrees LOL). Even at TDC truck refuses to fire.:
Noticed some arc marks on the spark plug wires so am thinking maybe spark is grounding before the plug.
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Thread Starter
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New User
Joined: Jul 2003
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From: California
Truck won't start
Changed the plugs, wires, cap & rotor, and ignition module. Check the wiring between the PCM and distributer all good.
What next, PCM?
One of the headlight bulbs is missing (not in the socket), do the head lights play a part like the brake lights do?
Fuel is good.
Sometimes the fuel pump doesn't shut off and floods the injectors fouling the plugs.
????????????????????????/
What next, PCM?
One of the headlight bulbs is missing (not in the socket), do the head lights play a part like the brake lights do?
Fuel is good.
Sometimes the fuel pump doesn't shut off and floods the injectors fouling the plugs.
????????????????????????/
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New User
Joined: Jul 2003
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From: California
Truck won't start
I had to go way back to get the original thread for this one but thought it would be the right thing to do.
I started out with a 1990 F-250 4x4 lariate 5.0l that would not start. Troubleshot the hell out of it for two weeks. I finnaly decided to break down and let a garage take a whack at the thing.
When I dropped it off I told the guy that I had followed the Haynes manual to the letter and was to the point I thought the computer was bad. His comment? "Hanyes, they make good panty hose". The only reason I took it to this guy is so that if the computer wasn't the problem I wouldn't be out the hundred bones for a new computer.
Well Mr. Numb Nuts had the truck a week and what do you know he came to the same conclusion. R&R PCM and truck runs fine. I was more than happy to pay the $250.00 bill (included towing and diagnostic) considering I bought the truck for $900.00 and it only has 48,000 miles.
Thanks to those of you that replied to my original post.
I started out with a 1990 F-250 4x4 lariate 5.0l that would not start. Troubleshot the hell out of it for two weeks. I finnaly decided to break down and let a garage take a whack at the thing.
When I dropped it off I told the guy that I had followed the Haynes manual to the letter and was to the point I thought the computer was bad. His comment? "Hanyes, they make good panty hose". The only reason I took it to this guy is so that if the computer wasn't the problem I wouldn't be out the hundred bones for a new computer.
Well Mr. Numb Nuts had the truck a week and what do you know he came to the same conclusion. R&R PCM and truck runs fine. I was more than happy to pay the $250.00 bill (included towing and diagnostic) considering I bought the truck for $900.00 and it only has 48,000 miles.
Thanks to those of you that replied to my original post.