Idle Issues!

[BlueDesertMachines702]

Just a quick overview of what im working with!
2000 ford ranger 4.0 W/ 5 speed. New clutch, fuel pump, Bored .30 over (no i didn't punch out the original block, its a kit), New alternator, plugs/wires, 160 degree thermostat, Cold air intake, Dumped Flowmaster 40. yada yada YAHH right....
ANYWAY:

Truck runs superb, but lets say im cruzin in any given gear and throw it in neutral for any given reason... The idle will stay up at 2k rpms, and sometimes higher with the A/C on. Unless i kick it at a light it will drop Instantly. Or if i wait long enough it will slowly come down by itself. Throttle body is not sticking i already checked it. Im thinking Vacuum leak at this point? Thoughts guys :/

 

[modelageek]

160 degree thermostat,

Why do you have a 160 degree stat?


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[BlueDesertMachines702]

For a few reasons, one the truck just runs better and colder which is always nice. Two in vegas it gets pretty hot so its just easier on the engine. Best 8 dollars i ever spent

 

[modelageek]

For a few reasons, one the truck just runs better and colder which is always nice. Two in vegas it gets pretty hot so its just easier on the engine. Best 8 dollars i ever spent

All that being said, the truck was not designed to run at 160. That might be your issue. I think i would install an oem stat at least while DXing this.



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[BlueDesertMachines702]

I understand, and honestly thought maybe its tricking the engine into flipping the choke on being electric and all since the original is a 191 degree. I tried running a stock Thermo and it did not solve this idle issue...

 

[modelageek]

I understand, and honestly thought maybe its tricking the engine into flipping the choke on being electric and all since the original is a 191 degree. I tried running a stock Thermo and it did not solve this idle issue...

I also would put the stock air intake back on while DXing. My .02

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[BlueDesertMachines702]

Im not totally expelling that idea, heck ill even give it a try. BUT, i have never heard of or seen a fuel injected vehicle behave differently due to cold air intake mod...

 

[modelageek]

Im not totally expelling that idea, heck ill even give it a try. BUT, i have never heard of or seen a fuel injected vehicle behave differently due to cold air intake mod...

If the MAF is not set properly it will. If the MAF has oil from a filter on it that will mess it up, etc. DXing over the internet is tough enough without dealing with MODS.

The 160F stat will battle the 14.7:1 ratio you are trying to attain. IMHO.

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[Earl43P]

160 makes it run rich, which carbons up the IAC, which controls idle.

Try cleaning its shaft.

http://www.therangerstation.com/Magazine/Summer2003/VacuumLeaks.shtml