Loss of power

[Leadfoot]

I am looking for a little direction in solving the following problem ('94 D90 3.9 North American Spec).



Recently I have had a problem with loss of engine power while driving (It is not a sputtering, this is a total loss of engine) Sometimes as I am coasting down, the engine starts running again. Sometimes it cuts out and stalls. Then, a minute later, without doing anything it starts up as if noting has happened.



During this loss of power, the radio works (so I have some electrical power). The temperature of truck if normal, and outside temperature is 20 Celsius and it is not been driven hard at all just cruising at 80kmph.



If someone could start me with the order of things to check/replace (with costs in mind) I would appreciate it very much. (i.e. fuel relay, fuel pump, coil etc....)



Thanks

[Roadsiderob]

Mark,
I'd start by checking the connections at the ignition coil...the original spade connections get dirty and loose and can cause the problem you have. The generally accepted repair is to cut off the spade connectors and crimp and solder on some ring terminals and bolt them solidly to the coil.
Rob

[arbik]

Leadfoot,

did you figure out what the problem was?

-arbi

I am looking for a little direction in solving the following problem ('94 D90 3.9 North American Spec).



Recently I have had a problem with loss of engine power while driving (It is not a sputtering, this is a total loss of engine) Sometimes as I am coasting down, the engine starts running again. Sometimes it cuts out and stalls. Then, a minute later, without doing anything it starts up as if noting has happened.



During this loss of power, the radio works (so I have some electrical power). The temperature of truck if normal, and outside temperature is 20 Celsius and it is not been driven hard at all just cruising at 80kmph.



If someone could start me with the order of things to check/replace (with costs in mind) I would appreciate it very much. (i.e. fuel relay, fuel pump, coil etc....)



Thanks

[Hans]

Also check the fuse for the Fuel Pump. Mine was badly corroded for some reason, which caused intermittant total shutdown.

Oh, and when was the last time you changed the fuel filter?

-Hans

[arbik]

Thanks for the info Hans. I just picked up the rig, and had this happen to me once. I'm taking it back to the dealership, but just wanted to see if it was something simple.

I'll have to check the fuses and have them change the fuel filter too.

-arbi