High Idle Problem - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

ranger_guy_82 · 03-29-2007, 23:29

My truck has a high idle problem. I cleaned the IAC valve, Seafoamed the engine twice, but still no luck. It also has a bad case of pinging. Even with Premium gas in it. It takes a min. for the idle to go down at stoplights and when shifting. Idk what else to check. I checked the EGR valve, and the truck had a new upper intake gasket installed a year ago....Any feedback would be much appreciated!!! BTW, it's a '97 4.0 5 speed.

mre_power · 03-30-2007, 00:08

what kind of egr sensor (dpfe) do you have the metal one or plastic. the reason i ask this is that some that have had a pinging problem when they change to the plastic kind of dpfe sensor the pinging stopped. check link i provided

Ford Performance, Tuning and Style!

ranger_guy_82 · 03-30-2007, 09:06

Hey, thanx for that link!...Ima try that this weekend. Also, my truck has the plastic egr sensor...

ranger_guy_82 · 03-30-2007, 10:26

Just wanted to add, after i cleaned my IAC Valve, it makes a whistling noise now...Is that normal???

mre_power · 03-30-2007, 17:37

probably have a vacuum leak some where

ranger_guy_82 · 03-30-2007, 21:44

It only started whistling after i cleaned it. I also gave it a good coat of WD-40. I'm gonna try to Seafoam the engine again. This time i will use the hose under the throttle body instead of the brake booster line and let it soak for an hour or so, instead of 10 min. Then change the plugs. What's a good plug for the 4.0?...I'm lookin for one that's not too hot or cold. Should i just use the Motorcraft Platinum ones like the plugs that came with the truck from the factory?

mre_power · 03-31-2007, 07:26

the brake booster is the best line because it will enter the engine chambers equally as apposed to 1 or 2 cylinders. and i let it sit for 20 minutes. burn out all the carbon (no more smoke) then change plugs.

seafoam how to