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windwaiver · Joined: 08 Feb 2009 Posts: 69 Location: reno, nv

Ok, how do you test the in tank fuel pump. I have tried the full throttle start technique and it works sometimes. Seems like it is starving for fuel, If i manually actuate the CSV (pushbutton mod) prior to cranking, it starts, but real slow. Still fighting the beast.
_________________
77.5 924 NA
81 924 na (great parts car)
82 924 NA
87 944S this is gonna cost
00 K1200LT

If i had a nickel for everytime I screwed up.......

924RACR · Posted: Sun Jan 31, 2010 11:03 pm Post subject:

I've gotten the impression the in-tank pump is more for high-flow needs... but anyway...

I figured mine was bad when it would barely make any noise. I disconnected the external pump to cut down on noise, then jumped the relay - result, not much. To confirm, I then removed the outlet hose and again applied power - no improvement in the flow of fuel.

When I removed it, the cause was clear - it was heavily caked with either mud or rust.

Of course, sometimes an ohmmeter/multimeter will show a problem if there's a break etc...

HTH...
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

windwaiver · Joined: 08 Feb 2009 Posts: 69 Location: reno, nv

thanks, still fighting the warm restart problem, car isn't worth anything when its hard to start until it cools off enough for the WUR. Least thats what it seems like. I can start it with the pushbutton mod most of the time.
_________________
77.5 924 NA
81 924 na (great parts car)
82 924 NA
87 944S this is gonna cost
00 K1200LT

If i had a nickel for everytime I screwed up.......

windwaiver · Joined: 08 Feb 2009 Posts: 69 Location: reno, nv

Ok heres what I know, any help out there of a past similar problem would really help.

The timing on the car says it is supposed to be set at 0 deg +-1deg. With it set to the spec, my vacuum is at 10#s. Setting the timing up to approx 12 I get 14 to 15 #s vacuum. Which means way more power.

I performed a leak down test of the engine and found all cylinders within 10% all around 13% leakage. All timing marks are lined up correctly, I have checked this too many times. I just ordered some new vacuum lines, (replaced most of them already) going to install silicone lines.
_________________
77.5 924 NA
81 924 na (great parts car)
82 924 NA
87 944S this is gonna cost
00 K1200LT

If i had a nickel for everytime I screwed up.......