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Old October 19th, 2009, 12:10 PM   #1
biohazardbill
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Default 89 Ford F-150 Stalling then not starting

My Dad brought over his truck for me to do a tune up on. It stalls sometimes and sometimes when it stalls it wont start for about 10-15 minutes. It also has a very low idle. It also lacks power and gets about 8 mpg. I asked if anything had been done to the truck and he stated that a guy he knows tried to "adjust the idle" while he was in the hospital. It is FI not carbed so im not sure what the guy tried to adjust... maybe the timing?

We have the stuff to do a minor tune up but im thinking that isnt going to solve the problem. I am also going to check the timing.

How do you time these vehicles.. the sticker says to disconnect something but im not sure what they are referring to when timing to 10 degrees BDC.

Any ideas?

Thanks in advance
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Old October 19th, 2009, 12:18 PM   #2
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adjusting the idle would mean adjusting the TPS I'm guessing
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Old October 19th, 2009, 12:25 PM   #3
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He probably pulled the plastic cover off the top of the throttle cable and adjusted the idle screw position. These motors are notorious for gumming up in the top end. The idle speed motor is probably gummed up, the EGR system is probably plugged and may have rotted pipes on the back side of the motor. The entire plentum is probably caked. If you remove the intake hoses from the front of the plentum you will see the very black residue left behind. I'm assuming you have the 302 in this vehicle? If the internals are caked up it's probably a good idea to remove the plentum, idle speed motor, EGR system, etc. and work on cleaning these items. I actually took the plentum off one of my 302's, to an engine shop and had them clean it for me. I also removed the intake manifold and had it cleaned as well. It's a bit of a job but generally worth it in the long run.
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Old October 19th, 2009, 01:50 PM   #4
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Quote:
Originally Posted by Bow_Extreme View Post
He probably pulled the plastic cover off the top of the throttle cable and adjusted the idle screw position. These motors are notorious for gumming up in the top end. The idle speed motor is probably gummed up, the EGR system is probably plugged and may have rotted pipes on the back side of the motor. The entire plentum is probably caked. If you remove the intake hoses from the front of the plentum you will see the very black residue left behind. I'm assuming you have the 302 in this vehicle? If the internals are caked up it's probably a good idea to remove the plentum, idle speed motor, EGR system, etc. and work on cleaning these items. I actually took the plentum off one of my 302's, to an engine shop and had them clean it for me. I also removed the intake manifold and had it cleaned as well. It's a bit of a job but generally worth it in the long run.
Sorry it is the 5.8

I will check this out.....
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Old October 20th, 2009, 12:19 AM   #5
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the spout that you need to remove is a small grey plastic shorting bar, should be near the distributor, it may have some tape wrapped around it or be taped to the harness if it has never been removed before.


x2 on cleaning the air intake system, along with the EGR and idle air bypass vlave...try using a cleaner that you can spray in as its running first, if that helps, but doesnt clean it out all the way, then you know that tearing it apart isnt a waste of time
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Old October 20th, 2009, 09:52 AM   #6
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X2 on cleaning it out. It most likely needs it.
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Old October 20th, 2009, 10:17 AM   #7
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you might also check the fuel pressure and fuel pressure regulator when that regulator starts going bad it can cuase all kinds of issues
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