Intermittent miss under load
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Scanman88GT
- Registered User
- Posts: 79
- Joined: Sun Aug 31, 2003 10:39 am
Intermittent miss under load
My 88GT's 2.8 just recently started to get an intermittent misfire under load. The car idles fine, and at highway cruising speeds, doesn't miss a beat. I notice it mostly when winding it out in first and second gear.
I just replaced all 3 coil packs today, and I know that the plugs/plug wires are ok. The ignition module is 2-3 yrs old. My gas mileage is still fine too (28.6 mpg highway). I also stuck a 180 degree thermostat in it about a month ago, but I've never read anything about them causing these kinds of problems.
Could this be a vacuum leak or something like that? If it were a fuel injection problem, it would screw up at any range and do it continuously, right?
Any ideas of where else to look would be appreciated.
Scanman88GT
I just replaced all 3 coil packs today, and I know that the plugs/plug wires are ok. The ignition module is 2-3 yrs old. My gas mileage is still fine too (28.6 mpg highway). I also stuck a 180 degree thermostat in it about a month ago, but I've never read anything about them causing these kinds of problems.
Could this be a vacuum leak or something like that? If it were a fuel injection problem, it would screw up at any range and do it continuously, right?
Any ideas of where else to look would be appreciated.
Scanman88GT
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yellow3800
- Registered User
- Posts: 293
- Joined: Tue Jan 15, 2002 10:00 am
- Location: Maryville, TN
Intermittent miss under load
I know the post is old, but its still here! lol
yes, a fuel inj. problem would most likely be noticed all the time.
Not vacuum anything - idle is the first thing to go up when a vacuum leak is present.
Any engine codes?
does it chug from cold to hot and all through?
One more thing - higher loads come from higher gears. Top gear is where most loads occur. Flooring the car when shifting into second gear is much less stressful than flooring a car in top gear at high speed.
yes, a fuel inj. problem would most likely be noticed all the time.
Not vacuum anything - idle is the first thing to go up when a vacuum leak is present.
Any engine codes?
does it chug from cold to hot and all through?
One more thing - higher loads come from higher gears. Top gear is where most loads occur. Flooring the car when shifting into second gear is much less stressful than flooring a car in top gear at high speed.