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Red face VERY high engine RPM on start up

I have just finished a six month R&R project on my '76 930. When starting up for the first time, the engine goes to about 4K RPM. I switched off the engine right away. I have checked the throttle linkage and adjusted it, it seems to be in the right range. I am wondering what I should be looking for / at next.

Thanks in adavnce!!
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rob76turbo
Past Porsches: 1972 914 / 1987 944S / 1976 930 / 1987 951 / 1999 986 / 1992 968 / 2001 986 S / 2006 Cayman S
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Old 03-05-2005, 01:35 PM
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It's probably your auxiliary air regulator. The early Turbos had a faster high idle than non-Turbos. You could either adjust the existing one, or swap it out for an SC unit.
Old 03-05-2005, 02:18 PM
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It could also be a vacuum leak.
Old 03-05-2005, 05:23 PM
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Is the butterfly tight in the throttle body? Is the hand throttle on or misadjusted?

4K seems high for sensor type problems.
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Old 03-05-2005, 06:21 PM
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BTW, how do you adjust the hand throttle?
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Old 03-06-2005, 08:23 AM
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why are you having to sell it?

Andy
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Old 03-06-2005, 08:48 AM
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It is the throttle linkage! I detached at the link on the trany and the car started, and idled normally. So when I play with the linkage between the trany and the accel pedel, I get full motion (and visa versa from the engine). But when I join the pedel linkage and the engine linkage at the trany, there seems to be 1 to 1 1/2 inches of travel I must take out of the pedel linkage for them to connect. I also seem to have run out the adjustment too. Do you think the issue is at the hand throttle?
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Past Porsches: 1972 914 / 1987 944S / 1976 930 / 1987 951 / 1999 986 / 1992 968 / 2001 986 S / 2006 Cayman S
Current Porsches: 1986 951 / 2005 Cayenne
Old 03-06-2005, 09:08 AM
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The CFO says to get rid of it. I dearly love the car, but I only drive it 6-10 times per year. On the day when it pulls out of the driveway (or goes into a car hauler) I will probably shed tears.
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Old 03-06-2005, 09:10 AM
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It must suck to be p-whipped.
Old 03-06-2005, 09:33 AM
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Quote:
Originally posted by 350HP930
It must suck to be p-whipped.

Heheheee.
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Old 03-06-2005, 09:41 AM
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CFO?

Andy
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1980 SC soon to be big hp 3.3t powered 73RSR Replica (well, I'm keeping the engine but everything else is going )
Old 03-06-2005, 11:31 AM
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Ya'll should know...
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Past Porsches: 1972 914 / 1987 944S / 1976 930 / 1987 951 / 1999 986 / 1992 968 / 2001 986 S / 2006 Cayman S
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Old 03-06-2005, 01:12 PM
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nope......is it a usa thing?
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1980 SC soon to be big hp 3.3t powered 73RSR Replica (well, I'm keeping the engine but everything else is going )
Old 03-06-2005, 01:31 PM
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CFO "Chief Financial Officer" Also know as "Wifey"
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Old 03-08-2005, 02:47 PM
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I got to question the masculinity of a man who would choose a boxter over a 930 and then claim his wife made him do it.

Last edited by 350HP930; 03-09-2005 at 03:30 PM..
Old 03-08-2005, 03:01 PM
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Incorrectly setting the timing (heck, it's always a guess at rebuild time) can cause the engine to race as well (too much advance). Timing the distributor right away is not necessarily a bad idea...

-Wayne
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Old 03-09-2005, 02:41 PM
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