HELP, Got a problem need your advice please.
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Freshman User
Joined: Aug 2003
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From: San Diego
HELP, Got a problem need your advice please.
1989 Bronco, when I use the A/C or the engine gets hot I hear a high pitched whine, followed by a loss of power. When the engine has about an hour or two to cool the problem goes away.
I don't think it is the cooling system now, as I originally thought. Could it be my Vacuum system? The fuel pump?
I'm stumped, please advise.
I don't think it is the cooling system now, as I originally thought. Could it be my Vacuum system? The fuel pump?
I'm stumped, please advise.
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Freshman User
Joined: Aug 2003
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From: San Diego
Not the A/C had it checked out today
Still going on, changed the radiator cap, the thermostst, flushed filled the coolant. When I say hot I mean the outside temp is hot like 95 degrees or higher and stop and go traffic. The A/C being on brings it on quicker too.
An old timer with a Chevy told me it's my fuel line getting too hot and therefore messing up the vacuum.
An old timer with a Chevy told me it's my fuel line getting too hot and therefore messing up the vacuum.
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Freshman User
Joined: Aug 2003
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From: San Diego
Don't know that one...
What's the garden hose trick?
I was looking at the post by 89 Bronco and noticed very similiar symptoms, maybe the leads to the EEC power relay or Fuel pump relay or the leads to the fuel pump.
Sure seems like I am not getting gas when it is occuring.
I was looking at the post by 89 Bronco and noticed very similiar symptoms, maybe the leads to the EEC power relay or Fuel pump relay or the leads to the fuel pump.
Sure seems like I am not getting gas when it is occuring.
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Freshman User
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From: San Diego
Another suggestion is the ignition module.
Another suggestion is the ignition module.
Could it be the loss of power is from it and the whine from something else, like a relief valve or something?
Could it be the loss of power is from it and the whine from something else, like a relief valve or something?
Postmaster
Joined: Mar 2004
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From: Michigan
get a piece of garden hose and use it like a stethascope,one end to your ear and the other end you put to where you think the noise is coming from.
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Freshman User
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From: San Diego
OK, will give it a shot tomorrow
I am going to check out the leads idea also, your hose idea, and if I can't figure it out then try the ignition module too.
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From: Florida
yes fuel pressure regulator is on drivers side of fuel rail....
but i doubt thats it.........(engine hot or cold) usually it would run like crap if regualtor was bad...but dont rule anything out till you check it...
i replaced mine it still did this...but i replaced it cause it was running like crap...in my case it was a multilayered problem....
will your truck run fine without AC if so just tear it all out so its easier to work on (also remove the bracket) other wise you will never get at the ignition module which may be the prob...I already told you how to remove it and test it on the other post.....
and after u fix it you can always rehook ac up......
But you have to take all that stuff off to get at dizzy....
but i doubt thats it.........(engine hot or cold) usually it would run like crap if regualtor was bad...but dont rule anything out till you check it...
i replaced mine it still did this...but i replaced it cause it was running like crap...in my case it was a multilayered problem....
will your truck run fine without AC if so just tear it all out so its easier to work on (also remove the bracket) other wise you will never get at the ignition module which may be the prob...I already told you how to remove it and test it on the other post.....
and after u fix it you can always rehook ac up......
But you have to take all that stuff off to get at dizzy....
Last edited by quantalimo; May 10, 2004 at 12:05 AM.
Postmaster
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From: Michigan
Well,I have had a few vehicles brought into the dealership for a whine noise and had it coming from a defective fuel pressure regulator letting to much pressure escape back into the return line,similar to when you turn a faucet on just a little bit.That is why I suggested the hose first,to try and narrow down where the noise is coming from before removing anything
Senior User
Joined: May 2003
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From: Florida
Right on bro, you may be right, just what im saying is the main problem is ...vehicle runs till hot then dies out then wont start till cool......
Now i dont see the regulator doing that.....sure it may squeal........
and as wel mine had a high pitched squeal after i replaced the fuel pressure regulator...so there is something else possible as well for sure....
maybe he should check spark after she dies (immediatly)that would automatically tell him its ignition system....or not
then you have the eletrical fuel system which is very fustrating to work on so im just trying to save him my fustrations and money loss by tellin him dizzy and ignition module..
maybe he should get some code off this thing.......and let us know
Now i dont see the regulator doing that.....sure it may squeal........
and as wel mine had a high pitched squeal after i replaced the fuel pressure regulator...so there is something else possible as well for sure....
maybe he should check spark after she dies (immediatly)that would automatically tell him its ignition system....or not
then you have the eletrical fuel system which is very fustrating to work on so im just trying to save him my fustrations and money loss by tellin him dizzy and ignition module..
maybe he should get some code off this thing.......and let us know
Last edited by quantalimo; May 10, 2004 at 12:23 AM.
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Freshman User
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From: San Diego
Problem solved thanks for the guidance!!!
Hot weather the fuel pump relief lifts and you lose fuel pressure.
It's the fuel pump / regulator / filter or a combination.
I changed my fuel pump, regulator, and fuel filter and problem is history.
It's the fuel pump / regulator / filter or a combination.
I changed my fuel pump, regulator, and fuel filter and problem is history.