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Old 05-06-2019, 04:00 PM   #1
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Trying to resurrect a Boxter! I have a no start question!

I just picked up a 99 Boxster and am trying to bring it back from the dead. It was last running in the fall. The car would start and run for about 3 seconds, and then not fire again until some hours later. I took a chance and replaced the Crank sensor (no tach movement when cranking). Then the car started for like 20 seconds with me feathering the gas and backfired and died. I looked under the car and there was a puddle of fuel under the passenger side from an exhaust junction. I checked fuel pressure and it was great, even after sitting for 30 min it still held. I took the throttle body T section off from between the intakes and there was fuel in both intakes and the T. My guess is some sort of vacuum issue thatís pulling fuel into the intakes? Any ideas? Thanks in advance!
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Old 05-06-2019, 04:03 PM   #2
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Fuel pressure regulator has a ruptured diaphragm?
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Old 05-06-2019, 04:19 PM   #3
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Quote:
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Fuel pressure regulator has a ruptured diaphragm?


Would that suck Fuel into the intake?
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Old 05-06-2019, 04:31 PM   #4
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I guess not, my error. In the moment I was thinking that the regulator had a vacuum line like many Porsches, but these cars do not.
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1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster bought new. Installed used motor at 89k.
1987 924S 2002 996TT PST2
Owned and repaired Porsches since 1974. Have driven them all the way the Dr intended...

Last edited by Paul; 05-07-2019 at 05:22 AM.
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Old 05-06-2019, 07:42 PM   #5
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Originally Posted by Evostumpy View Post
I just picked up a 99 Boxster and am trying to bring it back from the dead. It was last running in the fall. The car would start and run for about 3 seconds, and then not fire again until some hours later. I took a chance and replaced the Crank sensor (no tach movement when cranking). Then the car started for like 20 seconds with me feathering the gas and backfired and died. I looked under the car and there was a puddle of fuel under the passenger side from an exhaust junction. I checked fuel pressure and it was great, even after sitting for 30 min it still held. I took the throttle body T section off from between the intakes and there was fuel in both intakes and the T. My guess is some sort of vacuum issue thatís pulling fuel into the intakes? Any ideas? Thanks in advance!
Evostumpy, you've got two identical posts going on. Were I you, I'd kill one of these threads and focus on just the one.

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