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bill k
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Jun 3, 2009, 5:24 AM
Post #1 of 8
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1993 Sentra 1.6 Again
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Timing question. the manual says to time it at 10 degrees BTDC. On the crankshaft pulley there are 6 notch's and none are marked, Is the first notch actually zero or could it be 5 or 10 degrees after TDC. The car runs great, but now the wife says it does not have the awesome acceleration sentras are known for and it takes quite a few cranks for it to start. It used to start instantly. I set the timing at the 2nd notch, how far could I be off?
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Loren Champlain Sr
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Jun 3, 2009, 3:08 PM
Post #2 of 8
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Re: 1993 Sentra 1.6 Again
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Timing procedure; Run engine until at normal operating temperature. Turn off engine. Disconnect TPS. Restart engine, increase engine speed to 2000 rpm two or three times, then allow to idle. Once idling at 800-900 rpm, timing should be 8-12 degrees BTDC. If timing is incorrect, loosen distributor hold down bolt and turn distributor to adjust timing. Retighten distributor. Shut off engine. Reconnect TPS connector, restart engine and recheck timing.
I'd post a pic, but can't seem to get it to work, so....
. pointer
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5 0 10 20
ATDC BTDC
Well, I can't seem to get my stinking drawing to work, either. Looking at the crank pulley from the front, you'll see
the notches in the pulley. The one furthest to the left is 5 ATDC. Clockwise from there: TDC, 5 BTDC, 10, 15, 20 BTDC.
It would be so easy if I could figure out how to post a pic.
Loren
SW Washington
(This post was edited by Loren Champlain Sr on Jun 3, 2009, 3:14 PM)
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bill k
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Jun 4, 2009, 5:59 AM
Post #3 of 8
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Re: 1993 Sentra 1.6 Again
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Ok If I understand you correctly, the fourth notch is 10 degrees BTDC, I must be off by 10 degrees then which would account for the starting and the acceleration issue.
Thanks,
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DanD
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Jun 4, 2009, 7:29 AM
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Re: 1993 Sentra 1.6 Again
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What I would be wondering is why or how did the ignition time change, in the first place?
Electronic ignition isn’t like point ignition, where timing will change (retard) as the points wear out.
Did someone change (adjust) the timing improperly?
Is there excessive timing chain wear?
A worn timing chain will retard the valve timing, which in turn retards ignition timing.
A distributor shaft beginning to seize, can cause enough drag on the distributor housing that it could drag it past the hold down bolt; again retarding timing.
Dan.
Canadian "EH"
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bill k
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Jun 4, 2009, 8:10 AM
Post #5 of 8
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Re: 1993 Sentra 1.6 Again
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Thanks for the picture, that clears it all up. I changed the distributer because it was leaking oil internally and externally. There was oil inside the distributer cap and the seal between the cap and the housing was all swollen up and broken. Got one on E bay, it is dry as a bone. From what I can determine from what you and Loren have said I am about 10 degrees off on the timing and have it running at almost TDC. I will adjust it tonight when the wife comes home from work.
Thanks again
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Loren Champlain Sr
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Jun 4, 2009, 3:27 PM
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Re: 1993 Sentra 1.6 Again
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Dan; Thanks, buddy! I tried, but just couldn't get it to 'copy and paste'.
Loren
SW Washington
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bill k
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Jun 8, 2009, 5:06 AM
Post #7 of 8
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Re: 1993 Sentra 1.6 Again
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Thanks to Dan and Loren, we reset the timing to the correct mark and that car is running like brand new again. I never thought that 5 degrees off on the timing could make such a big difference in performance..
Good job guys
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Loren Champlain Sr
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Jun 8, 2009, 4:02 PM
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Re: 1993 Sentra 1.6 Again
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Bill; Thanks for taking the time to let us know how it turned out. Have a great week.
Loren
SW Washington
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