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undrprzur  



Joined: 27 Apr 2003
Posts: 18
Location: Eastern Washington
PostPosted: Sun Feb 05, 2006 3:51 pm    Post subject: Reply with quote
Ok guys, I will check the fule pumps, infact the external is new 4 Months, but hey anything can happen. The retard wire is good and well connected. I don't have a spare ditc, might have to buy a good one, SO IF ANYONE has One please post $. Will remove and test the tem sensor.

Question, does the temp sender on the housing under the Distributr have any significance on this situation?

Without a doubt, I am grateful to this board.
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Smoothie  



Joined: 01 Jan 2003
Posts: 8032
Location: DE (the one near MD, PA, NJ)
PostPosted: Sun Feb 05, 2006 4:55 pm    Post subject: Reply with quote
undrprzur wrote:
Question, does the temp sender on the housing under the Distributr have any significance on this situation?.
No the sensor/s back there wouldn't have anything to do with retarded timing. The air temp sensor at the throttle body could though as I think Paul mentioned. Another possibility is EIS (electronic idle stabilization) - if your idle speed isn't set correctly, EIS will set it for you by altering the timing, so if idle's set too high, EIS would retard the timing (at idle only) to bring the idle speed down. Did you check the timing only at idle? -Or at higher RPMs (2000-2500+) also? A defective air temp sensor would affect the timing at all times (idle, part throttle, full throttle).
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Paul  



Joined: 02 Nov 2002
Posts: 9491
Location: Southeast Wisconsin
PostPosted: Mon Feb 06, 2006 12:26 am    Post subject: Reply with quote
I was thinking the problem might be is that the temp sensor is sending false signals to the DITC. If it is sending temps that are higher than actual, at some point the DITC might believe they are critically high enough to reduce the timing drastically.

Easy to check, just follow the procedure I posted.
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Tigger937  



Joined: 11 Apr 2004
Posts: 919
Location: PCA Milwaukee Region
PostPosted: Mon Feb 06, 2006 5:10 am    Post subject: Reply with quote
undrprzur wrote:
Ok guys, I will check the fule pumps, infact the external is new 4 Months, but hey anything can happen.


Make sure the installed external pump is the correct one for 1981 931, ie., Bosch #0.580.254.967 or equivalent replacement.
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