924Board.org

jrrhdmust · Joined: 19 Mar 2008 Posts: 180 Location: Middle Georgia

I have now owned my 924s for about 2 years. Love the car.

Anyway, twice now parked nose up at about a 15 degree slope, with a 1/4 tank of fuel or so, I could not get the car started. I will turn over but not start. When I move the car to level, it still wont start imediately, but will after a couple of hours.

Is this a coincidence, and I need to roll up my sleeves and grab my multi-meter? or is there a normal explanation, and I need to avoind those circumstances?

Thanks!
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67 Mercury Cougar XR7 under Restoration
71 VW Superbeetle Completed Resto 11/07
73 Mustang Mach 1 10 Year old restoration

Rich H · Posted: Tue Jan 26, 2010 2:49 am Post subject:

Sounds like a hot start problem.
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1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

15° is actually pretty steep...no in-tank fuel pump or accumulators on the later cars...I'd guess you're starving the pump for fuel, maybe introducing a vapor lock condition?
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erstwhile owner of just about every 924 variant ever made

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

More info is needed to properly diagnose. When you are getting "no start," you need to see if the coil is firing (most easily done with timing light) and if you are getting fuel pressure.

Quickest test would be to reach into your glovebox, swap in your spare DME relay, and see if the problem persists.
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WeiBe (1987 924S 2.5t) - 931 S3

jrrhdmust · Joined: 19 Mar 2008 Posts: 180 Location: Middle Georgia

When there was a no start condition I put my hand on the relay and felt it click. Like I said I am trying to determine if the slope maybe pulled fuel away from the pickup at a 1/4 tank, or if I need to start checking the fuel system.
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67 Mercury Cougar XR7 under Restoration
71 VW Superbeetle Completed Resto 11/07
73 Mustang Mach 1 10 Year old restoration

gohim · Joined: 02 Nov 2002 Posts: 4459 Location: Rialto, CA

Might be nothing wrong but a combination of low fuel level, AND excess water/non-combustible liquids on the bottom of the tank (that is exposed to the fuelpump pickup due to the extreme angle of parking).

jrrhdmust · Joined: 19 Mar 2008 Posts: 180 Location: Middle Georgia

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

Might be a good idea to go ahead and drain the tank now, start with a clean slate...
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erstwhile owner of just about every 924 variant ever made

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

masterdave · Joined: 10 Dec 2008 Posts: 183 Location: Harrison NY

i had a similar problem, turned out some one had basically grounded both connections on my fuel pump so it was not driving at full pressure, so up hill it had to work harder but downhill there was enough help from gravity to drip the gas in, i would agree and say check your filter first, then check fuel pressure, from there move to Relays and connections could be a power issue some where in the cabling you are losing power and not running your pump at full potential.

jrrhdmust · Joined: 19 Mar 2008 Posts: 180 Location: Middle Georgia

ok Thanks!

I will check the fuel pump. I have rewired or replaced the rest of the fuel injection system just a little over a year ago. At that point I tested the pump and it was still good. I also replaced the filter then.
_________________
67 Mercury Cougar XR7 under Restoration
71 VW Superbeetle Completed Resto 11/07
73 Mustang Mach 1 10 Year old restoration

masterdave · Joined: 10 Dec 2008 Posts: 183 Location: Harrison NY

if you have done all that i would check the lines for leaks, defiantly check pressure at the fuel rail

jrrhdmust · Joined: 19 Mar 2008 Posts: 180 Location: Middle Georgia

Update: I didn't check the fuel pressure, I did check the flow rate it was fine.

Here is what I think happened. It sitting at the wierd angle I try and start to no avail - about 3 times. Then I move it to the street, slightly nose down a couple of degrees nothing. A few hours later she fires right up.

I think that crap gas was flowing into the engine. I tried to start it enough that I flooded it, so it would matter where it was sitting. Once the fuel evaporated it fired right up.

When I drove it this weekend, there was misfire and hesitation. After a while it smoothed out. I then filled the tank and have not had any more problems.
_________________
67 Mercury Cougar XR7 under Restoration
71 VW Superbeetle Completed Resto 11/07
73 Mustang Mach 1 10 Year old restoration

masterdave · Joined: 10 Dec 2008 Posts: 183 Location: Harrison NY

you may want to check your injectors sounds like they are dirty, if so i would get them cleaned, and you may want to flush out your fuel system do it with gas and feed from the engine(highest point) back

Joes924Racer · Posted: Tue Feb 02, 2010 9:54 am Post subject:

The tanks get rusty too. you might want to pull the intank pump and clean the pickup screen and see just what kind of crap is coming out of the opening on the bottem of the tank I had to remove mine and buy a reseal kit cause it was rusty and nasty.

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1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo.