whats does this do
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whats does this do
95 F-150 302. im having problems with the truck starting in the mornings. i got the battery checked, its good. changed fuel, no help. it has problems starting in the morning after that it starts everytime. i found this(below pic) not connected, look at another truck and the line comes from a heater line through the TB, out from the bottom to a sensor near/on the thermostat. the line on the top pic thats kind of kinked goes to the top elbow..what does it do..
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Joined: Jul 2004
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From: Cottage Grove, WI
The sensor in your bottom pic is your coolant temp sensor. The hole in the TB is where coolant runs through to warm up the air charge before it enters the engine. If your having problems w/ idle replace that sensor, i did and it smoothed my idle right out.
Elder User
Joined: Nov 2008
Posts: 668
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From: Northfield, MI
The coolant lines have nothing to do with the engine starting.
You'll have to be a little more descriptive than just saying the truck "has problems" starting. Does it crank or not crank? Does it just crank a long time? Will it start if you put the accelerator to the floor? How many miles? When was the last tune up?
You'll have to be a little more descriptive than just saying the truck "has problems" starting. Does it crank or not crank? Does it just crank a long time? Will it start if you put the accelerator to the floor? How many miles? When was the last tune up?
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the truck cranks. no problem. putting the acc to the floor does nothing. it just cranks when it cold. after a few mins it starts. today's temp was high 40-low 50's and it started right away. last tune was about 8 months ago.. im going to change the fuel filter. but i dont think thats going to do it. .
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Joined: Jul 2006
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From: Eureka, KS
They've just got the throttle body coolant lines bypassed. That coolant running through the TB supposedly keeps it from icing up. I have mine disconnected as well. I removed the metal line that runs from the radiator and plugged it off at the radiator. That adapter where the coolant sensor is and where the other side of the TB line goes was bad and leaking on my truck. I ended up fabbing a new on w/o the TB line provision out of a brass nipple and fittings, couldn't find that fitting anywhere.
As always, I'd pull the IAC valve and check it out real good. Make sure the pintle moves freely. Make sure the ports are open as well. AIC valve may be sticking when it's cold.
As always, I'd pull the IAC valve and check it out real good. Make sure the pintle moves freely. Make sure the ports are open as well. AIC valve may be sticking when it's cold.
Post Fiend
Joined: Mar 2002
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From: Bonita Springs FL
Mine's disconnected as well, although it doesn't get very cold here. I figure the EGR keeps it warm enough. 
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They've just got the throttle body coolant lines bypassed. That coolant running through the TB supposedly keeps it from icing up. I have mine disconnected as well. I removed the metal line that runs from the radiator and plugged it off at the radiator. That adapter where the coolant sensor is and where the other side of the TB line goes was bad and leaking on my truck. I ended up fabbing a new on w/o the TB line provision out of a brass nipple and fittings, couldn't find that fitting anywhere.
As always, I'd pull the IAC valve and check it out real good. Make sure the pintle moves freely. Make sure the ports are open as well. AIC valve may be sticking when it's cold.
As always, I'd pull the IAC valve and check it out real good. Make sure the pintle moves freely. Make sure the ports are open as well. AIC valve may be sticking when it's cold.
where is the IAC valve? is it in one of the pics?
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From: Eureka, KS
Mine actually was hard to start last night after my last post, lol. Been pretty cold here and truck sat for a day or two. Normally it just fires right up.
If it does it again, try cracking open throttle while the engine is spinning over. If IAC is stuck that will give it air to start up.
If it does it again, try cracking open throttle while the engine is spinning over. If IAC is stuck that will give it air to start up.
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this morn at 4am truck started good, drove 1.5hrs away, for work.. at 11am got done and went to start it,, no go.. i was fustrated cause i was not going to be stranded that far away. i held in the accel and cranked, truck stumbuld 2 times and then went to idleing good. got home removed the IAC, it was full of carbon buildup. cleaned it out. also the connector to the IAC as 2 wires. i didnt have my MM, but i stuck a test light. 1 red wire light came on, other nothing, is it ground to accuate the solonoid? if so where does it come from?
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Joined: Jul 2006
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From: Eureka, KS
controlled bt voltage pulses from the PCM. Should be about 10.5 volts with key on engine off at the plug. With it unplugged the resistance of the IAC valve should be between 7-13 ohms.
So if you just checked it with a test light and key on, the test light would light up pretty good at 10.5v.
So if you just checked it with a test light and key on, the test light would light up pretty good at 10.5v.
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From: laramie wyoming
if you ask me i would say you have stuck open fuel injectors, i see it often, i am a mechanic for ford, what ahppens is the fuel injectors bleed off the fuel pressure into the intake manifold, which makes a very rich condition, flooding the vehicle, after you crank the engine for a while the fuel clears the intake and the cylinders, and the truck will start, to help start the vehicle, hold the pedal to the floor, this shuts off the injectors, to diag this concern correctly, hook up a fuel pressure guage, cycle the key to pressure up the fuel system, shut it off, and watch the fuel guage, it should not drop more than 1 psi every 5 mins. good luck