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Belgian924t · Joined: 07 Jan 2006 Posts: 104 Location: Belgium

Hello,

after a long period (time) we completed the rebuilding of a 931 engine. Now when we start the engine, it goes immediately. But then it runs very rough, even when the engine is at normal operating temperature. At the high revs it runs very good, also very good driving performance.
The iginitiontiming is at 6° BTDC. 950 rpm.

What can be wrong?

- dump valve?
- vacuum hoses leaking (were replaced and no leaks found)
- timing belt wrong?

help!!

_________________
'79 931 with Carrera GT look
'86 944 turbo (sold)
'88 944 turbo S (sold)
'85 911 Carrera 3,2 (to be restored)
'80 911 SC "SOLD"
http://www.cardomain.com/ride/2224272

Paul · Posted: Tue Jul 04, 2006 10:42 pm Post subject:

Check the normal suspects:

air leaks
spark plugs (check for nice blue spark)
spark plug wires
cap and rotor
camshaft timing
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.