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Iac,tps,wtf


mosher41

Well-Known Member
Joined
Nov 9, 2009
Messages
56
City
Macedon, NY
Vehicle Year
1999, 1996, 201
Transmission
Automatic
Guys,
I just replaced the IAC and the truck ran awesome for about 60 miles....it then started studdering and just lost all of it's get up and go. I did get a code P0455.....and that is for a gross leak in the Evap System. Do I need to marry up the new IAC somehow or is it just a coincidence that I changed it and something else went wrong.

AND it has used almost 1/2 a tank of gas on about 60 miles.

Temp is fine, it went 50 or so miles before the CEL came on.

99 4.0 4x4
 
Usually a gross leak in the EVAP system means the gas cap has either been left loose or it's not sealing against the filler neck...... or you left a major hose off, usually going to the vapor canister....... hope this helps!!!!
 
No...if the code lists leak small it is the gas cap. If its leak large its most likely a vacuum line.
 
cleaned the MAF as per this website, changed plugs and oil.....WAAAALAAA

New truck !!!! lets just hope it stays this way, I have been chasing this thing ever since I bought it.
 
My mustang was getting bad mileage like that, look in your mirror whenever you take off hard or take a turn, look for fuel on the ground. It turned out the filler neck was busted and anything that sloshed fuel sloshed it right out of the tank.
 
If it's not the gas cap, check the little 90deg. rubber elbow on the crankcase vent tube. Seems to be a pretty common problem.
 

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