5.4 troubles with bumps
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Joined: May 2004
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5.4 troubles with bumps
Expedition fans,
I am in dire need of help!!! I have a 99 with 5.4. engine and 58,000 miles on her. Truck has gibson dual cat bat exhaust and K&N filter system. Tires are BFG 17" TKO's and shocks are Procomp 3000 . Ride is really stiff but I love this truck....anyway.... My problem is that as of the last week or so when I hit a series of bumps or rough road the engine stalls for a split second and then comes back up if I am accelerating. If I am coasting she stalls out all together. Some times the bumps are not that severe other times it has to bounce quite a bit. Whats the deal??? Dealer says there are no codes in memory and he can't figure out whats wrong.
Shocks and tires have been on about 5 months. The only thing I have done in the past month is add a can of injector cleaner about two tank fulls ago.
Anybody ever heard of this and where would be a good place to start looking for the root of this problem?
Thanks,
Joe
I am in dire need of help!!! I have a 99 with 5.4. engine and 58,000 miles on her. Truck has gibson dual cat bat exhaust and K&N filter system. Tires are BFG 17" TKO's and shocks are Procomp 3000 . Ride is really stiff but I love this truck....anyway.... My problem is that as of the last week or so when I hit a series of bumps or rough road the engine stalls for a split second and then comes back up if I am accelerating. If I am coasting she stalls out all together. Some times the bumps are not that severe other times it has to bounce quite a bit. Whats the deal??? Dealer says there are no codes in memory and he can't figure out whats wrong.
Shocks and tires have been on about 5 months. The only thing I have done in the past month is add a can of injector cleaner about two tank fulls ago.
Anybody ever heard of this and where would be a good place to start looking for the root of this problem?
Thanks,
Joe
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Joined: Feb 2003
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From: NJ ... the garbage state
check all the ground points as a first check. if your loosing ground it could kill ur ignition .... for a second or so? have had many ground cables go bad, rot internal to the cover through small cracks and what not, and would cause similiar things, eventually leading to no run. just my first thoughts of what to check. climb under the hood and check out battery cables and what not.
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Thanks for the tip. I think I may have traced the problem to a wire that had some insulation worn off from the K&N filter end cap rubbing on a large bundle of wires that terminate in the engine compartment fuse box. I have adjusted the clearance and I also dropped the tire pressure from 50 psi to 45 so far it hasn't happened again,the ride is smoother too.
