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  #1  
Old August 3rd, 2017, 09:44 PM
floorman2 floorman2 is offline
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02 V8 sport sluggish when humidity up

when the humidity is up outside, this car feels like a slug, but when it's low, it runs like a bat out of hell, any ideas? MAP sensor? what sensor reads humidity in the air?
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Old August 4th, 2017, 11:17 AM
joegr joegr is offline
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The MAP sensor is part of the EGR system, and wouldn't have anything to do with this.
There is no sensor for humidity.
The MAF sensor reads total air mass going into the engine, and air mass is affected by humidity, but I think that it would be a long shot (unlikely) that your MAF sensor is the problem.

A very common problem with the LS is marginal COPs (Coil On Plug). These experience internal high voltage breakdown, and the higher the humidity, the worse this will be. The solution is to replace all eight of them. It is important to use Motorcraft coils, as all the aftermarket ones seem to be crap. It is also very important to replace the spark plugs at exactly the same time. You need to verify that the gap on each plug is 1.0 mm. If you have oil in any of the plug wells, then you'll need to replace the valve cover gaskets too.
Lastly, if you see in rust on the old COPS or plugs, you'll need to replace the seal around the passenger wiper shaft under the cowl. (Ford sells a repair kit that is about $5 for this.)
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Old August 12th, 2017, 08:23 PM
floorman2 floorman2 is offline
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the CPO's and plugs are new, the issue just started recently, and since I post this I'm getting a "check fuel cap" message. I replaced it and it still comes on and the car is still sluggish and the fuel economy has decreased. I'm learning there my be an evap system leak? Thoughts on this? Oh and as far as using after market COPs? I get them from ebay, and never an issue. This problem is unrelated to COPs, no oil on the wells, no missing, no stumble.

Last edited by floorman2; August 12th, 2017 at 08:26 PM.
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Old August 13th, 2017, 08:14 PM
joegr joegr is offline
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Quote:
Originally Posted by floorman2 View Post
... Oh and as far as using after market COPs? I get them from ebay, and never an issue. This problem is unrelated to COPs, ...
Well, you don't have to believe me and the experiences of hundreds more.
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