Quote:
Originally Posted by stanley24538
Hello all
I have a 97 F150 4.2 that is making a loud roaring sound from the engine compartment whenever the gas pedal is pressed even just slightly. It also sounds like the engine is revving up really quickly but, it could just be the sound is making me think that it is. The truck does not have a tach so I cant really tell for sure. It is also getting poor MPGs. The only code the computer is showing is 1038 which means IMRC is stuck open. However this code has been showing for three years and this noise just started last week. From what I understand the IMRC (Intake manifold runner control) is only to increase fuel economy at a certain RPM range. I would have had it fixed only my local mechanic wanted $1000 to do the job and I only paid $900 for the truck. The only problem I have noticed until now was a slight irradic idle from time to time But, otherwise the truck ran great. Before this noise started I was getting 17-20 mpg and now I am only getting 12-14 if I am lucky. If anyone has an idea as to what could be causing this noise I would greatly appreciate the input. Many thanks in advance for the help.
|
It sounds like you have a bad intake leak. Use some W-D40 and spray around anywhere you think may leak. When you hit a leak the idle should smooth out.