1994 F150, 4.6L 6cyl: Wouldn't start the other day. Looked it over real good, found nothing. Tried again a day later: started. Ran rough for a little bit. Smoothed out and ran fine the next two days (250mi). Ran across town, went to start, wouldn't again. Replaced plugs recently, checked dist cap and rotor, replaced 02 sensor, plugs look like there getting plenty of fire (pulled out, while cranking), replaced fuel filter and checked pump while replacing filter. What next??? I'm out of ideas! What would cause this inttermitant problem? You guys seem to have been around, sure would appreciate some help. Thanks in advance!!

DL in TX

 

what engine???????you must mean the 4.9 inline six. The 4.6 is the infamos triton V8. You have done everything I would have done. It's possible the computer is somehow shutting things down. Or is it possible that the fuel pump is faulty? Try to determine if it is fuel related or electrcal. good luck

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97 F-150 4.6 auto, 4x2, 3.55 LS, trailer tow pkg, Air box modification with K&N, Dynomax Super Turbo exhaust.
Oh yeah, it's Oxford White with crome wheels, Legacy shell & custom grill, mlaugh-Meridian, Idaho.

 

Did you check your wires???

 

I had an 88 with the 4.9. I made a 3 hour trip from up north snowmobiling. The thing ran great with not even the slightest hickup. I parked in the driveway and it sat till the following weekend. Went to start it the next saturday and it wouldn't run. It had no spark. Troubleshot the ignition. After about a week and a half, I noticed that I also had no fuel pump. I ended up removing the wiring harness from the computer all the way out to the battery and checking each wire for continuity. It turned out to be a broken 12 volt wire to the computer. There are multiple 12 volt and ground wires going to the computer. They all have to be good connections.

 

I would check for a spark. You replaced all of the normal maintance equipment, but obviously the engine isn't getting a spark. It might be the IGNITION MODULE, or yes the computer. How many miles does the truck have on it. If you have alot I would check the module first!

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Thanks!

1993 F-150 302/e4od/355 Limited slip. dual exhuast w/o mufflers,2 1/4" pipes with Echo Tips, headers, accel plugs/wires(8.6mm)/rotor/cap, hypertech powermodule,5% dark tint. Alpine cd player and Pioneer speakers. I need to get it Dyno Tested and qtr mile times. And someday Ill get picks!!!!!!!!!

1989 F-150 XLT 4x4 302/aod true duals with turbo mufflers, 30X9.50" wild country tires, 3:55 gears w/LS(want after market LS for front) 3" SuperLift would be nice too!

Future SuperDuty owner: But I have it the sheet filled:

F-350 SuperCab Longbed, 4x4, offroad pkg. Powerstroke(Duh!) Auto, 3:73Ls Oxford White with grey bench and VERY dark tinted windows. Maybe someday I can afford 33x12.50 BFG's Mud Terrain! Whatcha Think?

 

Don't you mean the infamous Ignition Module Pastmaster?

Unfortunately, dldport says he is getting spark, so I'd look for a fuel system problem. If the pump(s)is/are OK and both tanks (if equipped) are full, then I'd pull the codes from the EEC and see what it might think is wrong. If there are no codes, then maybe check the pressure regulator on the fuel rails as well as the computer itself. Wiring is always a suspect with intermittant problems.

Neal




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1997 4x4 Expedition- 4.6L, true dual exhaust w/glass-packs, K&N air filter, SuperChip, airbox mods, Edelbrock shocks, 285/75R16 BFG ATs, Optima "T-Bone" wheels, and Clarion In-dash CD player. Just added Smitty Bilt push bars and nerf bars!!

1993 4x2 F150 Reg. Cab LWB- 5.0L, cat-back dual exhaust w/glass-packs, K&N air filter, Superchip, fresh paint, and Line-X bedliner.

2000 "other"
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