engine will start but not idle

FORD F-150
Avatar
SMITTY1224
  • MEMBER
  • 1 POST
I have a 97 ford f150 4x4 4.6l 5 speed 98000miles. It starts but will only stay on if my foot is on the gas. My check engine light is on and when i ran the codes it said it was running lean. I've changed the 02 sensors, cleaned the fuel injectors and replaced the gas cap. And now this. I am wondering if it may be the IAC or the mass air flow sensor, but i dont know which one is more likely. please help.
Oct 30, 2007 at 6:04 PM
Advertisement
Avatar
BLACKOP555
  • ✓Experienced Mechanic
  • 10,386 POSTS
Well first i would like you to clean the MAF sensor with some qd contact cleaner. next you should check the EGR and make sure it is not plugged open with carbon. next check the PCV valve, when shooken it should rattle, if not replace it. also check the rubber boot and the hose for cracks and cuts.

if those are all good then you should definetley clean the throttle body and replace the IAC
Dec 5, 2007 at 12:19 PM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle