Engine Hesitation
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Member
Joined: Aug 2001
Posts: 50
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From: Washington
Engine Hesitation
1998 F150 V6 4.2L 195K
While driving at around 40-50 I move over to go around a vehicle and when I accelerate the engine hesitates and acts like it choking. I put it to the floor and it hesitates and coughs for a while then acts like it clears itself out and takes off and I speed up. The same happens when merging as I accelerate. I do not get any codes when this happens. The only code I have gotten before this start happening was a #6 cylinder misfire.
All other time the engine runs fine. Any ideas as to what the problem might be? Thanks.
While driving at around 40-50 I move over to go around a vehicle and when I accelerate the engine hesitates and acts like it choking. I put it to the floor and it hesitates and coughs for a while then acts like it clears itself out and takes off and I speed up. The same happens when merging as I accelerate. I do not get any codes when this happens. The only code I have gotten before this start happening was a #6 cylinder misfire.
All other time the engine runs fine. Any ideas as to what the problem might be? Thanks.
Senior Member
Joined: Aug 2004
Posts: 1,986
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From: Pasadena, Maryland
A common cause of hesitation seems to be vacum leaks, bad coil packs, plugs, wires, etc. Have you had a tune up recently or looked into any of the above factors?
My truck has 103K on it now. During the 90K-100K span,my truck was not running up to par. I was experiencing hesitation, poor gas mileage, and lean codes, etc... The items I replaced are listed below. My truck is running great now.
- replace DPFE sensor (repalced according to the CEL code)
- cleaned MAF sensor (tried this as recommended on this site).
- new coil pack, plugs, wires, induction service (all part of Fords 100K mile service I had done).
The ones below fixed the reoccuring lean code I was getting.
- new upper and lower intake gaskets
- new plenum isolator bolts (actually part of a TSB).
- new PCV hose
I'm not sure if this will fix your issue, or if you have already done all those, but they seem to be common issues\fixes I've seen on this site with the 4.2L.
Good Luck
My truck has 103K on it now. During the 90K-100K span,my truck was not running up to par. I was experiencing hesitation, poor gas mileage, and lean codes, etc... The items I replaced are listed below. My truck is running great now.
- replace DPFE sensor (repalced according to the CEL code)
- cleaned MAF sensor (tried this as recommended on this site).
- new coil pack, plugs, wires, induction service (all part of Fords 100K mile service I had done).
The ones below fixed the reoccuring lean code I was getting.
- new upper and lower intake gaskets
- new plenum isolator bolts (actually part of a TSB).
- new PCV hose
I'm not sure if this will fix your issue, or if you have already done all those, but they seem to be common issues\fixes I've seen on this site with the 4.2L.
Good Luck
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Member
Joined: Aug 2001
Posts: 50
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From: Washington
I replaced a couple of elbows that were leaking last year. I haven't checked lately to see if they are bad again. Replaced the coil pack last summer. Wires are 3 years old. Just put new plugs and fuel filter in last saturday. PCV valve was changed last summer as well.
What is an 'induction service'?
What is an 'induction service'?
Senior Member
Joined: Dec 2006
Posts: 43,538
Likes: 817
From: Joplin MO
That is where they hook up a BG machine and run solvent down the intake.
Early 98's had bad lower intake gaskets - I hope yours aren't starting to leak. If you are losing coolant without evidence of an external leak, I'd go get that checked out *immediately* before the thing hydrolocks on you.
Early 98's had bad lower intake gaskets - I hope yours aren't starting to leak. If you are losing coolant without evidence of an external leak, I'd go get that checked out *immediately* before the thing hydrolocks on you.
