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ghost2

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While driving at moderate/mild acceleration I notice a bit of "jerkiness" at or around 40mph. If I add pedal it's gone or if I back off it's gone or if I cross that number at more aggressive throttle it never shows up. Feels like empty space?
This is kind of picky but somehow it doesn't seem right.
 
Usually described as a "flat spot"? Could be fuel filter issues, spark plug/wire issues, or even just in need of a good SeaFoam. I suggest pulling codes first, if nothing shows up then it's time for some maintenance.
 
No codes other that that damn IMRC pass side code. So I it's spark plug/wire time [I guess the slight miss at idle is telling me something].
Thank you
 
Yeah, I had the same issue and replacing the (2nd gen) coils per Jeremi's suggestion fixed it right up. Don't know if you have a 1st or 2nd gen but either way, ignition system would be my first guess.
 
When is the last time plug wires and coil packs were replaced? If plugs are new, then I would look at these items next. Naturally going to the Ford Racing wires would be my first step, and then replacing the coil packs next (FOMOCO Brand).
 
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steve said:
don't rule out trans shutter as well if replacing the ignition parts don't work
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Trans shudder won't happen under NO load.
 
AnthraxBird said:
Sounds like the TC or maybe one of the valves in the valve body.
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I hope not. It's time for plugs and wires so that will be first. As for the valve body and TC, this flat spot doesn't happen during any shift points. So I'm not sure how to diagnose for those items.
 
Roadboss said:
When is the last time plug wires and coil packs were replaced? If plugs are new, then I would look at these items next. Naturally going to the Ford Racing wires would be my first step, and then replacing the coil packs next (FOMOCO Brand).
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I was looking at the Ford racing wires from Summit. However, at the moment I have a $50 off coupon from Advance, so I am going for the Denso wires [I run the Denso wires in my Lexus SC 400 with great results so I assume they will work well in the Mark]???????
 
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Ehhh....do they have a warranty?
 
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You guys are getting to detailed here. Basics is where you start! Maintanance is key.
 
J said:
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Ehhh....do they have a warranty?
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They [wires] have a 1 year warranty.
I have a low RPM miss and this flat spot so I'm going to try the wires and plugs first. If that doesn't fix these two details then I will be back to you guys crying for more help. :confused:
 
The more I think of it, the more im pretty sure it could be plugs and wires. Also, is it when your cruising at a normal speed? A dead spot is also caused by a worn out TPS sensor. Check that :)
 
AnthraxBird said:
A dead spot is also caused by a worn out TPS sensor. Check that :)
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That would be my suggestion as well. If you hook up a voltmeter to the TPS and manipulate the throttle (KOEO), you should see a smooth "sweep".

Note: A digital VOM is the best tool to adjust a TPS but an analog VOM is better to diagnose a failing TPS.
 
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