08 GT starts but won't stay running - Ford Mustang Forum
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post #1 of 27 (permalink) Old 07-14-2019 Thread Starter
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08 GT starts but won't stay running

Hello,


Last weekend my 08 GT started with a bad idle and then died on us while we were 250 miles away. I was able to get it started again and we made it home but since then it will intermittently start and run ok and idle just fine until I rev it up and bit and then it will sputter and die at idle.
After that it will only fire up but not continue running, giving it gas does nothing.
What I've tried:

Edited:


1) Cleaned the throttle body
2) Replaced the MAS
3) Replaced the fuel filter
4) Replaced the fuel pump
5) Replaced the Throttle body motor
6) Replaced the fuel rail pressure sensor due to a CEL, CEL went out after.
7) Replaced the TPS

I've run out of ideas, there are no codes and once in a while it'll act like all is ok for a while.


Help?

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post #2 of 27 (permalink) Old 07-14-2019
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Did you replace the fuel filter?



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post #3 of 27 (permalink) Old 07-14-2019 Thread Starter
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Originally Posted by Bullitt95 View Post
Did you replace the fuel filter?

Yes I did, I forgot to add that.
Also, a couple of weeks ago I got a CEL that told me my fuel rail pressure sensor was bad even though it ran just fine.
I replaced the sensor and the CEL went away immediately and has until this last weekend. The car fires up like it wants to run, it just dies right away.
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post #4 of 27 (permalink) Old 07-14-2019
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It's might be an electrical problem or a vacuum leak. Ignition coil, wires, spark plugs, etc. It's an eleven year old car so these things go eventually. Check all the hoses to make sure they are connected and not leaking. Are the plug wires arcing? Run the engine and lower the hood a bit to keep the light out and see if any of the wires arc.

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post #5 of 27 (permalink) Old 07-14-2019 Thread Starter
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Quote:
Originally Posted by Pete Grimaldi View Post
It's might be an electrical problem or a vacuum leak. Ignition coil, wires, spark plugs, etc. It's an eleven year old car so these things go eventually. Check all the hoses to make sure they are connected and not leaking. Are the plug wires arcing? Run the engine and lower the hood a bit to keep the light out and see if any of the wires arc.

Pete

The CP's were replaced with Accel's about a year ago, plugs were done then too. I used a can of starting fluid to check for vacuum issues, haven't found any yet.
I can't get the car to run long enough to check for an arc.. :-/
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post #6 of 27 (permalink) Old 07-14-2019
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Do you have a scanner that can read diagnostic data and codes? If so that could be helpful. There are a number of things you could check with that, but my first thought is fuel pressure.

I would suggest checking the spark plugs just to make sure they are fine. I replaced mine half a year ago and then in the last month I had been getting a hesitation while accelerating. I checked everything else first assuming the plugs were fine, but when I checked them yesterday, one was broken and I had been running on 7 cylinders for the last month. That at least is an easy check.

Another thing you can check is fuel injectors. The easy checks for those without removing them are using a stethoscope or something to transmit sound and listen for a steady clicking while the engine is running. You can then check the resistance of each one with a multimeter to see if one is way off.
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post #7 of 27 (permalink) Old 4 Weeks Ago Thread Starter
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Do you have a scanner that can read diagnostic data and codes? If so that could be helpful. There are a number of things you could check with that, but my first thought is fuel pressure.

I would suggest checking the spark plugs just to make sure they are fine. I replaced mine half a year ago and then in the last month I had been getting a hesitation while accelerating. I checked everything else first assuming the plugs were fine, but when I checked them yesterday, one was broken and I had been running on 7 cylinders for the last month. That at least is an easy check.

Another thing you can check is fuel injectors. The easy checks for those without removing them are using a stethoscope or something to transmit sound and listen for a steady clicking while the engine is running. You can then check the resistance of each one with a multimeter to see if one is way off.

I can't get the car to run long enough to check the injectors with a stethoscope. The car was running fine up until it wasn't, could all injectors go at the same time? Or the plugs?
Someone elsewhere suggested I check for 12V at the pump.
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post #8 of 27 (permalink) Old 4 Weeks Ago
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What fuel rail pressure sensor did you install? Aftermarket or Ford OEM? Can you monitor live data? If so, what is the fuel rail pressure pre-igntion?

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post #9 of 27 (permalink) Old 4 Weeks Ago
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Have you checked the fuel pump driver module?


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post #10 of 27 (permalink) Old 4 Weeks Ago
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Quote:
Originally Posted by RR5150 View Post
I can't get the car to run long enough to check the injectors with a stethoscope. The car was running fine up until it wasn't, could all injectors go at the same time? Or the plugs?
Someone elsewhere suggested I check for 12V at the pump.
That was me in StangNet.com. It's highly unlikely that all the injectors, coils, and plugs would fail at the same time.
If there was a major ignition failure, the engine wouldn't even start at all, never mind start and run for a few seconds. My money is on a fuel delivery problem. You said you replaced the fuel pump and that it whines when you turn the ignition on, so the pump itself and the FP relay are probably OK, and the problem could lie in the fuel pump driver module as Kraig suggested.


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Last edited by Bullitt95; 4 Weeks Ago at 04:13 AM.
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post #11 of 27 (permalink) Old 4 Weeks Ago
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Quote:
Originally Posted by Bullitt95 View Post
. . . My money is on a fuel delivery problem. . . . .

yep that would be my bet too -- it is getting enough fuel to start, but not enough to keep running . . . but sorry I don't know how to narrow it down any better than that, beyond what has already been suggested

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post #12 of 27 (permalink) Old 4 Weeks Ago Thread Starter
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Quote:
Originally Posted by Kraig1957 View Post
Have you checked the fuel pump driver module?



I was unaware that part even existed until you mentioned this. Where is it located?

And thank you to both you and Bullit95 for even reading these forums and chiming in, and to anyone I missed.
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post #13 of 27 (permalink) Old 4 Weeks Ago
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It should be in the spare tire well, aft on the drivers side. There is a wire harness that connects to it, and the view of it,when looking straight down, is blocked by piece of plastic.


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post #14 of 27 (permalink) Old 4 Weeks Ago Thread Starter
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Quote:
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It should be in the spare tire well, aft on the drivers side. There is a wire harness that connects to it, and the view of it,when looking straight down, is blocked by piece of plastic.

Yep, I found it and replaced it. $112 for a Dorman replacement at AutoZone. No go, the car still fires up strong and dies right away. On the first start I was able to give it some gas and make it idle like crap for a bit before dying.
After that it just starts and dies. This is incredibly frustrating...
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post #15 of 27 (permalink) Old 4 Weeks Ago
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Have you had the catalytic convertor checked? If it`s plugged the car will act like that.


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