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Old 07-29-2017, 01:44 PM   #1
Johann245
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Default 94 945 Turbo rough to start

Went and bought this '94 turbo the other day. Rough to get it to start, then when it starts it will idle normally. Any slight amount of throttle it dies or if I let it idle, dies after 20ish seconds. Maf or fuel pump/system related? 300k+ miles, cali car, stock.

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Old 07-29-2017, 02:36 PM   #2
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Try unplugging the MAF and starting it
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Old 07-29-2017, 02:42 PM   #3
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Try unplugging the MAF and starting it


I'm on my way out there now.
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Old 07-29-2017, 04:46 PM   #4
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Swapped out mafs, unhooked battery for a awhile. Still will only accept q tiny bit of throttle once in a while and surge. There is only one pump on the '94 with just a filter under driver.
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Old 07-29-2017, 04:48 PM   #5
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Going to pick up a cheap pump for now and swap in, see what happens.
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Old 07-30-2017, 01:46 AM   #6
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Sounds like maybe another '95, but with the 760 headlamps.

1994 should still have the dual fuel pump setup.

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Old 07-30-2017, 05:29 AM   #7
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Yup, '94 - dual pumps.

'95 - mostly single. Mostly. '96 - '98, single pump.
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Old 07-30-2017, 10:04 AM   #8
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Stalls when revving sounds like an air leak. Pull all the hoses and carefully inspect them.
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Old 07-31-2017, 10:59 PM   #9
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Quote:
Originally Posted by Johann245 View Post
Went and bought this '94 turbo the other day. Rough to get it to start, then when it starts it will idle normally. Any slight amount of throttle it dies or if I let it idle, dies after 20ish seconds. Maf or fuel pump/system related? 300k+ miles, cali car, stock.
Pull the vacuum hose off the pressure control reg before you start your way down the wild ass parts hang guessing games rabbit hole

Seriously, check that first
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Old 08-01-2017, 03:50 AM   #10
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If someone took out the main pump next to the filter, which is unlikely but possible, there wouldn't be enough pressure for it to run. In any case, check fuel pressure IMO. 94 as said should have two pumps. Maybe someone put in a Walbro intank and it's failing?
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Old 08-02-2017, 08:58 AM   #11
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If someone took out the main pump next to the filter, which is unlikely but possible, there wouldn't be enough pressure for it to run. In any case, check fuel pressure IMO. 94 as said should have two pumps. Maybe someone put in a Walbro intank and it's failing?
I'm blind I guess. Didn't see pump past the filter underneath.

I first swapped in a cheap new intank. Still nothing. Then swapped main with my old one from my classic. Fired right up. Drove it home.
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Old 08-02-2017, 05:30 PM   #12
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Cool.

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Old 08-02-2017, 05:51 PM   #13
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I'm confused. How did you know the main pump was bad?
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Old 08-02-2017, 06:34 PM   #14
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I'm confused. How did you know the main pump was bad?
He replaced it with one that worked, then drove the car home.
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Old 08-02-2017, 08:37 PM   #15
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That's exactly how my megasquirted 242 behaved when a wire came off the fuel pump relay. An engine will start and idle for a surprisingly long time on residual pressure in the line or the flow from the pre-pump.
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Old 08-02-2017, 09:38 PM   #16
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I'm confused. How did you know the main pump was bad?
Wasn't priming with key nor with a jumped fuse. The relay was clicking. Obvisouly ive got spark because it was starting, my air was known good by swapping mafs. Last thing I need is fuel.
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Old 08-03-2017, 02:48 AM   #17
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Originally Posted by James10952001 View Post
That's exactly how my megasquirted 242 behaved when a wire came off the fuel pump relay. An engine will start and idle for a surprisingly long time on residual pressure in the line or the flow from the pre-pump.
It's also how my old silver K-Jet 242Ti behaved when the main pump crapped out on Union Hill Rd in '01. Start, run at a random unstable idle for about 15-20 seconds, then die.
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Old 08-03-2017, 10:23 AM   #18
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Wasn't priming with key nor with a jumped fuse. The relay was clicking. Obvisouly ive got spark because it was starting, my air was known good by swapping mafs. Last thing I need is fuel.
Good test. I understand now.
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