Engine hesitates around 40mph
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Trailering
Joined: Jun 2021
Posts: 20
Likes: 1
Engine hesitates around 40mph
I have a '95 F-150 with a 5.0. When I get around 40 mph, especially going up hill, it starts hesitating. It's like I'm stepping on and off the gas. When I give more throttle to push pass it, the transmission kicks down a gear and it goes on about it's business. What is causing this?
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Likely you are experiencing a lean stumble or an ingition crossfire.
The high voltage ignition system is powerful enough to produce arcing between plug wires or to metal engine components so the wires need to be in good condition, routed correctly and sometimes protected with sheathing where they would contact metal.
The high voltage ignition system is powerful enough to produce arcing between plug wires or to metal engine components so the wires need to be in good condition, routed correctly and sometimes protected with sheathing where they would contact metal.
Cargo Master
Joined: Mar 2007
Posts: 2,852
Likes: 1,035
Like all old cars, if you do not know when the last time you replaced the wires/plugs, now is a good time.
I routed my wires so neatly on my 95 5.8 and after a slight misfire I dealt with for over 15 years, I finally stopped ignoring all the suggestions of wire routing [to #5 & #6]. Once I routed the wires so they were not running parallel, the engine ran like new. It is amazing how high voltage and go across wires without even seeing it.
I routed my wires so neatly on my 95 5.8 and after a slight misfire I dealt with for over 15 years, I finally stopped ignoring all the suggestions of wire routing [to #5 & #6]. Once I routed the wires so they were not running parallel, the engine ran like new. It is amazing how high voltage and go across wires without even seeing it.
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Trailering
Joined: Jun 2021
Posts: 20
Likes: 1
I just replaced the spark plugs and wires. But this truck has done this since I've owned it, about 8 months now. It does it at a certain spot every time, it's not all over the place. Runs great besides in that not so sweet spot. I did a eec test and got a few codes. One was 332- EGR valve opening not detected. But I can see it moving up and down when I throttle it. Could that be it? Or the canister purge valve?
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