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Old 08-31-2011, 06:34 PM   #1
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Fuel problem help!

I'm a n00b just got my 86 mustang gt. The problem I that when it starts it won't stay running UNLESS you give it gas. I know this could be anything. Fuel pump/distributer/vacuum leaks/spark plugs/blah blah. Just let me know what you think thanks.
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Old 08-31-2011, 06:46 PM   #2
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Is it fuel injected?
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Old 08-31-2011, 06:59 PM   #3
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Yes it is.
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Old 08-31-2011, 07:17 PM   #4
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I had this problem when I first got my mustang and I just removed the iac valve and cleaned it...will yours stay running after it warms up?..

---------- Post added at 07:17 PM ---------- Previous post was at 07:14 PM ----------

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Old 08-31-2011, 07:20 PM   #5
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I haven't tried that if I did I think It would take awhile haha

Thanks
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Old 08-31-2011, 07:26 PM   #6
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The iac (idol air control valve) is probably the problem.
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Old 08-31-2011, 07:36 PM   #7
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I'll check it out! Thanks!
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Old 08-31-2011, 09:07 PM   #8
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Was your iac just clogged with crap?
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Old 08-31-2011, 09:12 PM   #9
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Quote:
Originally Posted by NateNasty
Was your iac just clogged with crap?
Over time they get alot of carbon bulid up...i couldnt tell this is for sure your problem,but it is a common problem with the older fox's...tps sensor and fuel pressure is another cause of this problem..
But just cleaning the iac valve is the easiest and cheapest place to start!..
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Old 08-31-2011, 09:36 PM   #10
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I forgot to plug the tps sensor back in when I took my upper intake off and it did the same thing.
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Old 09-01-2011, 09:01 PM   #11
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Is it speed density? Or has it been converted to mass air?
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Old 09-01-2011, 10:41 PM   #12
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Just stock
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Old 09-01-2011, 10:51 PM   #13
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If you do not have a Haynes or Chilton manual you need to pick one up to diagnose. I would start by replacing regulator, as it sounds like the diaphragm may have a hole in it.
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Old 09-02-2011, 09:29 AM   #14
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Yeah I have on of those books.
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Old 09-02-2011, 07:09 PM   #15
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Well I took of the iac and it's pretty clean I'm not sure if there's two sensors but it looks like it so I'll lean it just for the sake of it. I'm moving on too the regulator. See how that is. Do I need to take of my upper intake?
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Old 09-02-2011, 07:21 PM   #16
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Just because the iac is clean doesn't mean that it is working it could be bad. Before you remove the regulator you should put a fuel pressure gauge in the rail and see if you have a loss of pressure. Since you say that it will run if you keep your foot on the accelerator I think that the regulator is ok and the iac has stopped working.
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Old 09-02-2011, 10:17 PM   #17
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Yeah are there two sensors on the Iac??
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Old 09-03-2011, 05:28 AM   #18
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There are no sensors on the iac. If you are looking at something that has two parts with electrical connections on them it is the throttle body. The larger one on the throttle body is the iac.
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Old 09-03-2011, 01:09 PM   #19
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Click image for larger version

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I'm pretty sure that's important It was barley hanging on I broke it on accident. What is it?
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Old 09-03-2011, 01:23 PM   #20
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That is the vacuum hose to the egr
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Old 09-03-2011, 01:26 PM   #21
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You can buy new hose in the help section at your local auto parts store....yeah those lines break very easily!!..
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Old 09-03-2011, 01:26 PM   #22
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Could this cause a dead 5.0? And if it's ripped make the car run like a dead dog?
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Old 09-04-2011, 11:15 PM   #23
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Re: Fuel problem help!

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Originally Posted by NateNasty View Post
Could this cause a dead 5.0? And if it's ripped make the car run like a dead dog?
It could very well make it run rough.
One of the first mods you should look at is converting the car from speed density to MAF.
That will make it much more tunable and easier for the ECU to learn new mods you make.
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Old 09-05-2011, 05:42 PM   #24
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Okay, well call me noob but I can't get these fuel lines apart I know you have too release the pressure but every thing Iv read is so veg

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Old 09-05-2011, 05:53 PM   #25
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Quote:
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Okay, well call me noob but I can't get these fuel lines apart I know you have too release the pressure but every thing Iv read is so veg

<img src="http://www.mustangevolution.com/forum/attachment.php?attachmentid=31400"/>
Your gunna need the quick release tool!..another ride to the auto parts store for you!!...
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Old 09-05-2011, 05:57 PM   #26
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Quote:
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It could very well make it run rough.
One of the first mods you should look at is converting the car from speed density to MAF.
That will make it much more tunable and easier for the ECU to learn new mods you make.
Ok please tell how to convert to maf
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Old 09-05-2011, 05:59 PM   #27
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Looks like this...this one is for 90 and newer ford & gm...
They also have little plastic ones that sometimes work better..
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Old 09-05-2011, 06:02 PM   #28
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I'm guessing that will pop the fuel lines apart?

---------- Post added at 06:02 PM ---------- Previous post was at 06:01 PM ----------

Oh fun I'll run and get one! Thanks!
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Old 09-05-2011, 06:09 PM   #29
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Yes the line has lip on it that catches a barb of sorts,and the tool will spread the barb over the lip...
You press the tool and push the lines together and the lines will release...sometimes it takes a little messing around,but the good part is to put them back they simpley snap back in..

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Just make sure you get the right one for your year...
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Old 09-05-2011, 06:12 PM   #30
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Alright I'm going to look.
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Old 09-05-2011, 09:43 PM   #31
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Re: Fuel problem help!

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Ok please tell how to convert to maf
Speed Density to MAF Conversion
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Old 09-06-2011, 07:18 AM   #32
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What does converting do for you? Pros cons?
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Old 09-06-2011, 09:01 AM   #33
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Re: Fuel problem help!

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What does converting do for you? Pros cons?
Easier to tune.
ECU responds better to modifications.
More modifications are available for MAF controlled cars.

My 86 GT was converted over ten years ago and it was one of the best mods ever done to the car IMO.
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Old 09-06-2011, 11:04 AM   #34
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Did you change the iac?
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Old 09-06-2011, 09:27 PM   #35
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No I did some investigating through the motor too look for blown gaskets. Did all that now it's time too do that iac biz.. Btw I broke my damn thermometer it was on the edge that doesn't effect anything ? Or does it?
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