08 GT Starts and then immediately dies

R

RR5150

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Jul 14, 2019

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VT

Jul 14, 2019

#1

• Jul 14, 2019

• #1

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. Lately though it only fires up and dies right away.

What I've tried:
1) Cleaned the throttle body
2) Replaced the MAS after cleaning it didn't help.
3) Replaced the fuel filter, I can hear it engage, could hear the old one too.
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

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.. :-/

I've run out of ideas, there are no codes.


Help?

 

Dino Dino Bambino

15 Year Member

Jun 13, 2007

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Jul 15, 2019

#2

• Jul 15, 2019

• #2

Sounds like a fuel delivery problem. Check if the new fuel pump primes when you turn the ignition on, and if it has 12v power and a ground.

 

R

RR5150

New Member

Jul 14, 2019

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Jul 15, 2019

#3

• Jul 15, 2019

• #3

I can definitely hear it engage as did the old one before I changed it out. I'll look for 12V tomorrow.
It fires up like it wants to run strong as new but then dies.

 

Dino Dino Bambino

15 Year Member

Jun 13, 2007

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Jul 16, 2019

#4

• Jul 16, 2019

• #4

In that case the fuel pump itself, and the fuel pump relay, are probably OK and it could be the fuel pump driver module that's at fault.

 

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fiftyslost

Member

Jan 1, 2019

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Illinois

Jul 16, 2019

#5

• Jul 16, 2019

• #5

Had similar problem. The fuel shut off switch on drivers side kick panel kept tripping. I bypassed the switch and have not had a problem since. Just a thought.

 

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R

RR5150

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Jul 14, 2019

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Jul 17, 2019

#6

• Jul 17, 2019

• #6

fiftyslost said:

Had similar problem. The fuel shut off switch on drivers side kick panel kept tripping. I bypassed the switch and have not had a problem since. Just a thought.

Click to expand...

That's soemthing I will have to check out for sure, thanks!

 

R

RR5150

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Jul 14, 2019

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Jul 17, 2019

#7

• Jul 17, 2019

• #7

fiftyslost said:

Had similar problem. The fuel shut off switch on drivers side kick panel kept tripping. I bypassed the switch and have not had a problem since. Just a thought.

Click to expand...

I bypassed that switch today, had no change.
This morning I started the car up and it idle up and down a little bit at first and then smoothed out. I was able to rev the engine and let it return to idle. I shut it off and abd tried to start it again and I'm back where I was. It fired up strong like it wants to run and then immediately dies.

 

Red_LX

I’m not much help unless you’re looking for ****!

Founding Member

Nov 29, 1999

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Morgantown, WV...where couches meet their doom

Jul 17, 2019

#8

• Jul 17, 2019

• #8

Do you still have the stock coil packs around that you could maybe try switching them out?

 

R

RR5150

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Jul 14, 2019

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Jul 18, 2019

#9

• Jul 18, 2019

• #9

Today I learned that if I I spray brake cleaner into the intake it'll stay running just as long Iong as I keep spraying it in.

 

Dino Dino Bambino

15 Year Member

Jun 13, 2007

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Jul 19, 2019

#10

• Jul 19, 2019

• #10

I'm beginning to wonder if your new fuel pump is a dud.

 

S

Shuttleman83

Active Member

Jun 30, 2019

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Jul 19, 2019

#11

• Jul 19, 2019

• #11

Check valve maybe restricted or faulty, try priming the fuel pump roughly 3 times in succession. Key on, off, key on, off, key on, then start. Some fuel pumps actually need this.

 

Troublesome_Hobby

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Sep 3, 2018

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Johns Creek, GA

Jul 20, 2019

#12

• Jul 20, 2019

• #12

I had a similar issue that incredibly was solved by my neighbor - fuel pump just wouldn't supply fuel sporadically. Swapped the fuel pump relay with an identical relay and BAM SOLVED. The contacts just weren't making contact. WEIRD HUH. Been 6 months and 0 issues since. Car was sitting and would crank/not start, swapped relays, started immediately. Hit all the contacts with contact cleaner for good measure after that ridiculous experience.

 

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R

RR5150

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Jul 14, 2019

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Jul 21, 2019

#13

• Jul 21, 2019

• #13

Shuttleman83 said:

Check valve maybe restricted or faulty, try priming the fuel pump roughly 3 times in succession. Key on, off, key on, off, key on, then start. Some fuel pumps actually need this.

Click to expand...

I tried this, no change. I also swapped a relay as Troublesome suggested.

This morning after letting it sit for a couple of days I went out and tried to start it and it fired right up, bit of a rough idle at first but it smoothed out. I then let it run for five or six minutes while I went around and started wiggling wires, etc to see if I could make it stall. I couldn't.
Eventually with me doing nothing at all is stalled out on its own. Now it just starts and dies again.

I didn't do the sending unit underneath the passenger side of the tank, I only did the complete assembly under the drivers side, could this be the issue??

THIS MAY BE FIXED:

A few days ago I got a P0193 code thrown. Fuel rail pressure sensor. I went to AutoZone and got a new one, put in on and the code went out.
Today out depsperation I put the old one back on and it FIRED RIGHT UP. I let it idle for a while and shut iff and started it again. So next I took it down the road, no issues. Could be that AutoZone sold me the wrong/bad part?? Looks like it $500 in parts later.

 

Last edited: Jul 21, 2019

Troublesome_Hobby

Member

Sep 3, 2018

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Johns Creek, GA

Jul 22, 2019

#14

• Jul 22, 2019

• #14

Hopefully it's solved, but I am curious how removing and replacing the fuel rail would solve the problem.

 

R

RR5150

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Jul 14, 2019

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Jul 23, 2019

#15

• Jul 23, 2019

• #15

The fuel rail sensor, not the fuel rail. The part they sold me had to have failed but never tripped a code. It still running like a top.

 

Troublesome_Hobby

Member

Sep 3, 2018

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Johns Creek, GA

Jul 23, 2019

#16

• Jul 23, 2019

• #16

EXCELLENT and congratulations RR5150 - hope that's the last of that issue

 

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