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5.0 Warm Up Issue

yellowbronco

yellowbronco

Cuts Through Grease !!!
Location
Moab
I have an 87' port-injected 302, that up until recently would, when started idle at a higher rpm then kick down to a low idle. It does not do this anymore. Now when I start it, it never idles up and sometimes dies unless I give it a little gas until it has warmed up. So, is it a sensor that has gone out, or some kind of mechanical thing, or what?
 
Kiel

Kiel

Formerly WJ ZUK
Yeah usually mounted right to the intake. Shaped like a pill bottle and a trapazoid on the intake mounting usually on fords. Maybe check your coolant temp sensor also, maybe it's not getting into closed loop
 
yellowbronco

yellowbronco

Cuts Through Grease !!!
Location
Moab
Ok, I think you're right Goat. I spent just a few minutes on some Mustang forums and it sounds just like my problem. I'm going to go clean it and if no dice on that, then I'll get a new one. Thanks.
 
GOAT

GOAT

Back from the beyond
Location
Roanoke, VA
It's mounted on the throttle body. Looks cylindcrical, is about two inches long, and has a black two-wire plug connecting it. TPS voltage should be .89-.95 at idle. On a SD sytem, I used to set the base idle with the set-screw on the TB at 700-800 RPM when warm, and just let the IAC do its thing when the engine is cold or when the A/C is turned on. When warm, the engine should not die when you unplug the IAC. SD is way basic, and just needs TPS, O/2, and MAP sensors at idle.

HTH -Marcus
 
yellowbronco

yellowbronco

Cuts Through Grease !!!
Location
Moab
Ok, I took it out and cleaned it up last night, re-installed this morning, and it works again!!! Woot. :greg:
 
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