Mechanics

WON'T START. NO VOLTAGE TO FUEL PUMP. NO SPARK AT PLUG.

1989 Ford Ranger • 130 miles

After running without incident 2 days earlier I accidentally left the ignition on.
After charging the battery, the engine would crank but showed no signs of starting.

I noticed there wasn't an audible fuel pump noise when ignition was switched on. (Pump/sending unit are approx 1.5 years old.)
After determining the pump would operate with direct voltage I checked fuel pump relay, inertia switch and (because of a forum post) the EEC relay.
When truck would not start after making fuel pump run continuously I checked for spark. None exists.

I checked coil, coil wire and distributor mechanism. The TFI could be at fault for a lack of spark but I don't think it has anything to do with the fuel pump.

Whatever is at issue controls both fuel and spark.

Unfortunately the only item I am aware of that controls both tasks is the ECM.


My next task is to see if I can detect any error codes.
Being an '89 these are very simplistic.



Avatar
Stephenmoore
October 7, 2012.



You are on the right track.

The ecm grounds the eec relay for the spark and fuel to operate.

A scan tool would help to see if any info is coming from the ecm

check all powers and grounds for the ecm.

Start there

Roy

Thanks, will do.

Tiny
Stephenmoore
Oct 7, 2012.
Couldn't find anything on youtube but did find my code reader.
Unfortunately it's been separated from it's manual. (I have 2 for the GM reader.)
This may be a moot point because when I plug the reader in the light stays on continously.
Turning the ignition on makes no difference.
Jumping the single test wire to ground makes no difference.

Tiny
Stephenmoore
Oct 7, 2012.
Code reader will give you no info, just codes. You need a full blown scan tool.

Roy