Any help is appreciated.. Truck had been running fine until I shut it off in front of my office. Ten mniutes later I turned the ignition.. It started very weak, idled at about 400 rpm, stumbled and died! Has not fired up since. Had it towed home. I replaced the fuel filter, coil and map sensor. The fuel pressure is at 40 lbs I am getting spark to the plugs. No matter how long I crank the motor over I do not get the slightest smell of gas at the exhaust? I have only owned the truck a few weeks the previous owner provided me with a smog certificate along with reciepts for an oil change, rebuilt trans, new O2 sensor, air bypass valve. Any help is appreciated Thank You

 

Try and pull the codes, if you can not pull the codes I think you may have lost the EEC.
Does the fuel pumps run for two seconds and quit or do they run all of the time now.

 

I have tried pulling codes reading the flashes of the check engine light. As near as i can tell the code is 122 which indicates a map sensor. The pump comes on for a few seconds when the ignition is turned to run. I have checked the fuel pressure at the rail (45lbs) I also tested the low pressure pump and it is fine. Thanks for the response. What is the eec?

 

EEC failure is VERY rare.

From your description, it sounds to me like a fuel related problem.

Code 122 is actually a TPS code. And a failed TPS will definately cause problems like yours. The TPS is one sensor that assists the EEC in determining how much fuel to dump, based upon how open the throttle plate is.

 

The EEC is the computer but from what you posted it sounds like it is OK.
A 1988 should have the two-digit code so 122 does not make any sense.
I would look around the Neg. (-) Post of the Battery for a small Black wire with a fuse looking thing (its a connector) and then the wire is either a black wire with a green stripe or a white stripe.
If this wire is not grounded good you will have this kind of a problem.

 

Thank you for the input. After replacing the coil, Iac(distributor module), Map sensor ... I am still not getting a strong spark (very weak yellow intermitent spark) from the coil terminal? I measured primary and secondary reistance and they are within specs. I measured ignition supply voltage and it is correct. Any clues as to what would cause this. My error code now reads 11 (system passed)

 

Did you look at the EEC Ground wire at the NEG (-) Post of the Battery?

 

Thank You Subford, Yes I checked the ground at the neg batt terminal. I have two black wires coming from the neg battery clamp it is connected with a two pin connector and then into the wiring harness. As for the coil being grounded it is bolted to the metal plate that is bolted to the engine and exhaust manifold stud. Is that sufficient grounding? Again I very much appreciate your input. Ive not much hair left to pull out!! ThanksAgain Derrick

 

You might be having a much simpler problem than you think.

At least on my '94 f150, I have a coking issue. Not even worth the money to fix it.

When starting your car, push down the gas to the floor, and it should start up. And it may die, but just sit there for about half a minute, and it should be fine.

I may be tottally out of my league here, since I don't know alot about trucks, but that's just my .02 cents worth

-D

 

Thanks for the input. Turned out to be a stripped timing gear. I did get a good education on EFI in the process. I ruled out the chain early on because the distributor was turning when cranked. Had I taken it a step further and used a timing light I may have noticed how far off the timing was. I was also getting an error code indicating the IAC (distributor module) Moral is " Proper Trouble Shooting" Again my thanks for the good advise.

 

Cool, glad you got it runnin.

Adrianspeeder