96 f150 5.0 Running problems

RED352 · May 30, 2017

96 f150 4x4 5.0 165k miles.

So, truck has some demons. Truck will run great when it's cold. Plenty of power, never misses a lick. Until it gets up to running temperature. Then it's loses power while driving. Mainly when taking off from a stop. Will idle perfect. Only runs bad when driving. As it's gets warmer it progressively gets worse. Eventually will shut off completely, then won't recrank until it cools off.

New distributor, ignition coil, ICM, cleaned maf and iac.

Read that it might need to be advanced but no help.

Fellro · May 30, 2017

Still have the catalytic converter?

RED352 · May 31, 2017

Yes, but wouldn't a plugged cc cause issues weather the motor is hot or cold?

O'Rattlecan · May 31, 2017

What kind of engine codes are you getting?

Is something running out of range and giving the computer bad fuel/air info?

If it's running fine cold, that tells me that it's in the closed loop (no computer feedback) okay, but when it starts referring to sensors it gets jacked up.

Ryan

Fellro · May 31, 2017

Was kinda thinking the same Ryan. O2 sensor becomes suspect.

Reason I asked on the cat is that I have seen it quite often that initially, a vehicle will work fine with a partially plugged cat, and the hotter it gets, the worse the vehicle performs to the point you have to back pedal to keep it moving. Stop, cool, and will be mostly fine again. It isn't quite as cut and dried as say a filter plug, but I have also seen that happen to where you stop, the crud falls down, and then you can run for a bit again.

Join Our Ford Truck Forum Today

96 f150 5.0 Running problems

RED352

Florida Chapter member

Fellro

Moderator

RED352

Florida Chapter member

O'Rattlecan

Redneck Prognosticator

Fellro

Moderator

Ford Truck Articles

Recent Forum Posts

Share this page