1995 F150 power loss upon acceleration
12-17-2008, 10:39 PM
#11
Carbon Monoxide Commando
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Hello, all! I appended this question to an abandoned thread earlier, but no luck..
Last night my truck ran just fine until suddenly a condition occurred on the highway, leaving me coasting while feathering the throttle to keep the engine going..
I have a 1995 F150, 5.0l, auto. and now I can't even reach speeds of over 5-10 km/h - while it backfires and gives that nice, powerless throaty sound, but has NO power!
No load: engine runs ok / only Intermittently stumbles & shakes
Under load: Engine stumbles almost to stalling, must feather the throttle to keep a steady 5km/h..
-Strong smell of fuel, so we know the fuel pumps are ok - changed fuel filter anyway,
-Changed cap & rotor, plugs were fouled but no improvement with replacement,
-Re-checked my plug wires to assure correct firing order...
Smashed the EGR with a hammer a few times to see if it was stuck open - nothing
-Going to pull the throttle body off next & clean / test the IAC solenoid...
The EEC-IV gave me 3 interesting codes:
172 HO2S system indicated LEAN condition (our biggest clue) - continuos
334 EGR valve pos. sensor out of expected voltage range (high) - off, running
538 ??! What the heck does THIS mean? - off, continuous
The condition occurs intermittently (AFTER I think it's ok to take a drive,) but is at the point now that it's not at all drivable -- there was nothing wrong otherwise before this happened...
PLEASE HELP - I gotta get to work somehow!
Thank you!
Last night my truck ran just fine until suddenly a condition occurred on the highway, leaving me coasting while feathering the throttle to keep the engine going..
I have a 1995 F150, 5.0l, auto. and now I can't even reach speeds of over 5-10 km/h - while it backfires and gives that nice, powerless throaty sound, but has NO power!
No load: engine runs ok / only Intermittently stumbles & shakes
Under load: Engine stumbles almost to stalling, must feather the throttle to keep a steady 5km/h..
-Strong smell of fuel, so we know the fuel pumps are ok - changed fuel filter anyway,
-Changed cap & rotor, plugs were fouled but no improvement with replacement,
-Re-checked my plug wires to assure correct firing order...
Smashed the EGR with a hammer a few times to see if it was stuck open - nothing
-Going to pull the throttle body off next & clean / test the IAC solenoid...
The EEC-IV gave me 3 interesting codes:
172 HO2S system indicated LEAN condition (our biggest clue) - continuos
334 EGR valve pos. sensor out of expected voltage range (high) - off, running
538 ??! What the heck does THIS mean? - off, continuous
The condition occurs intermittently (AFTER I think it's ok to take a drive,) but is at the point now that it's not at all drivable -- there was nothing wrong otherwise before this happened...
PLEASE HELP - I gotta get to work somehow!
Thank you!
12-18-2008, 04:09 PM
#12
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I'd just like to thank everyone for their input - it wasn't emissions crap-related at all: I cut off my spare tire, beat the tank pretty good, and it fired up just fine.
Therefore, it WAS the in-tank fuel pump. Although, I'm gonna replace it with a piece of hose and a cheaper in-line Holley "Blue," so it'll push and prime the high-pressure rail-mounted pump I installed in the summer.
Thanks again! Your forum is essential to anyone who chooses (or not) to own a Ford product!
Therefore, it WAS the in-tank fuel pump. Although, I'm gonna replace it with a piece of hose and a cheaper in-line Holley "Blue," so it'll push and prime the high-pressure rail-mounted pump I installed in the summer.
Thanks again! Your forum is essential to anyone who chooses (or not) to own a Ford product!
11-15-2017, 01:44 PM
#13
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I'd just like to thank everyone for their input - it wasn't emissions crap-related at all: I cut off my spare tire, beat the tank pretty good, and it fired up just fine.
Therefore, it WAS the in-tank fuel pump. Although, I'm gonna replace it with a piece of hose and a cheaper in-line Holley "Blue," so it'll push and prime the high-pressure rail-mounted pump I installed in the summer.
Thanks again! Your forum is essential to anyone who chooses (or not) to own a Ford product!
Therefore, it WAS the in-tank fuel pump. Although, I'm gonna replace it with a piece of hose and a cheaper in-line Holley "Blue," so it'll push and prime the high-pressure rail-mounted pump I installed in the summer.
Thanks again! Your forum is essential to anyone who chooses (or not) to own a Ford product!