Ford F150 - R.P.M. surge at start-up

jerbar · Posted: Thu Mar 27, 2008 7:26 am Post subject: R.P.M. surge at start-up

I have a 97 4.6. When i start it , hot or cold, I get a surge of about 1500 r.p.m.'s This does'nt seem normal.

joshmac4.6 · Posted: Thu Mar 27, 2008 8:02 am Post subject:

Check for vacuum leaks and clean the IAC
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Just wait till I finish this thing! Exhaust Vid: http://www.youtube.com/watch?v=PExYwCnbNMg
another one: http://www.youtube.com/watch?v=vlxLCbPvSvM

williamscl5 · Posted: Thu Mar 27, 2008 2:01 pm Post subject:

Cold, yes it is, warm, no. Sounds like the IAC needs cleaning or replacing.

Cheers

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2002 F150 5.4L XLT SuperCab LB 4X4 3.55LS
True Blue/Silver 2 Tone
Luverne SST Entry Steps Cab/Bed
B&W Turnover Ball Hitch + Factory Class III
Skid plates + Splash Guards + Electric Brake Control

jerbar · Posted: Tue Apr 01, 2008 7:25 am Post subject:

thanks for your input. i did clean the iac valve with no change. also, i noticed that the DPFE sensor/EVR solenoid makes a buzzing noise after turning off the truck. is this normal? no vacuum leaks either. i've been a FORD man my whole life. but i'm old school as far as mechanics so i definately appreciate the troubleshooting help. i just purchased my truck which is a 97 F-150 4x4 short bed, regular cab. the truck is in excellent condition. pics coming soon.