Having trouble with a miss
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Having trouble with a miss
Ok well I recently bought a 1998 f150 2wd with the 4.6. With 165k miles.
When I first got it I noticed it had a miss, put my meter on it and came back with cylinder 8 misfire. It is not a constant miss and much worse once it has been running for a bit. Engine makes no odd noises to indicate timing chain issues.
Has a new coil pack, pulled the plug it is an autolite double platinum that looked almost brand new, wires look new. Swapped with another wire from a different plug and still number 8 misfire.
Plug hole appeared dry with no oil or moisture.
Kind of at a loss for this one. No other codes or pending codes.
When I first got it I noticed it had a miss, put my meter on it and came back with cylinder 8 misfire. It is not a constant miss and much worse once it has been running for a bit. Engine makes no odd noises to indicate timing chain issues.
Has a new coil pack, pulled the plug it is an autolite double platinum that looked almost brand new, wires look new. Swapped with another wire from a different plug and still number 8 misfire.
Plug hole appeared dry with no oil or moisture.
Kind of at a loss for this one. No other codes or pending codes.
Logistics Pro
Joined: Jan 2001
Posts: 3,740
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From: Central NYS
And swap the coil packs side to side.
And swap the #8 injector with another hole.
If it STILL comes up with a #8 misfire, might have to do a relative compression check to make sure there is no mechanical issues.
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Think I may have this issue worked out. After some swapping and pulling and reconnecting of different plugs and harness connections... drove it about 50 miles without the miss...
If this holds out its time to start thinking about putting all new timing components and new oil pump since the engine does have some age/mileage.
If this holds out its time to start thinking about putting all new timing components and new oil pump since the engine does have some age/mileage.
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Also when I tore down the 5.4 in my Expy the timing chains were not making racket but had enough slack that they had actually damaged the housing of the pump.
I have gotten the miss worked out and fixed.
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