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-   -   4.2L Idle problem (https://www.f150online.com/forums/v6-engines-including-ecoboost/228244-4-2l-idle-problem.html)

EVO f150 03-16-2006 11:19 PM

I have a problem somewhat simular to this, when i press the clutch in to stop my truck tries or does die, not every time but often any thoughts to that.

Peacemaker 03-17-2006 02:26 AM

Update! I had a new exhaust put on my truck a little over week ago and the problem stopped. It's weird. I had the entire exhaust replaced from the cats back, and it hasn't even tried to act up on me? Not Once! :confused: That's all right with me though.:lol: :thumbsup:

I highly suspect my problem was a loose baffle rattling around in my Flow 40 that was blocking off the exhaust flow. Now that I think back, my old exhaust made some funky sounds sometimes (like a whistling noise). I think that was the pressure from the exhaust blowing against the loose baffle.

I don't have to worry about that with the new maggy flow that's on there now.:coffee:

JgGravy 03-19-2006 02:58 AM

Ran through all the lines, no visible cracks, wear, or loose conections. It's not anoying enough to require a weekend to figure out, but i'll be looking into it as soon as it gets serious.

I'll keep that in mind when i do get around to it though, thx for the idea.

emontgo1 03-22-2006 01:46 AM

I had a problem with bogging down during idol and found my sparkplug wire on the passenger side was arching on something.:angel:

Peacemaker 03-22-2006 09:43 AM


Originally Posted by emontgo1
I had a problem with bogging down during idol and found my sparkplug wire on the passenger side was arching on something.:angel:

Thanks for the news. I'll check it out.:beers:

steve longo 03-24-2006 03:48 PM


Originally Posted by Peacemaker
Everytime I start my truck when the engine is cold in the morning, it will start up just fine and run really smooth for about 2 minutes. Then my engine will start to shake and miss like it's about to quit.

That lasts 10-15 seconds. Then it clears up and doesn't miss a beat until the next time I start the engine cold.

I've cleaned my IAC valve (nearly spotless at 60k miles), MAF and IAT sensors.

There is no CEL or DTC'S. This has me stumped. :confused:

The only thing I can think of is the Flowmaster muffler I'm running now has crapped out. It's rusty and has a loose baffle banging around in there.

I don't think that's the problem though. Because it starts shaking at exactly the same time about 2 minutes after cold start up.

Any help?

Check you EGR proving switch

Peacemaker 03-24-2006 09:50 PM

I've already replaced the dpfe sensor or "proving switch". My idle is ALOT smoother now since I put my stock airbox back on with my drop in K&N. I cleaned the maf and throttle body while I was at it. My Mac intake must have had a leak somewhere I suspect. I dunno. It's running good now, so I'm leaving it alone!:D

TSDan 03-25-2006 03:11 AM


Originally Posted by Peacemaker
I've already replaced the dpfe sensor or "proving switch". My idle is ALOT smoother now since I put my stock airbox back on with my drop in K&N. I cleaned the maf and throttle body while I was at it. My Mac intake must have had a leak somewhere I suspect. I dunno. It's running good now, so I'm leaving it alone!:D

Well glad to hear you narrowed it down.What did you use to clean the maf sensor before you buttoned it up?
Thanks

Peacemaker 03-25-2006 11:45 AM

I used "non-residual" electrical contact/switch cleaner. You can get it at Radio Shack or Walmart.:thumbsup: Just give the maf wires about 5 or 6 quick short bursts. Let it air dry for about 20-30 minutes before you turn the key "ON". A puddle of the cleaner can build up under the maf wires and short them out if you don't make sure it has completely evaporated before you turn the key on.


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