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Nopis1O
02-18-2009, 11:50 PM
Is there anyway a tach could be off by a couple thousand rpm's? Its an aftermarket tach and i think it is about 2000rpm's above what that actual engine is reving at. is this possible? if it is, is there anyway to check and fix the problem?
http://i155.photobucket.com/albums/s309/SideWayzGTU/d.jpg
thanks
Whizbang
02-19-2009, 12:49 AM
well i wouldnt put it passed it. Best thing to do though is just hook up another tach to the signal wire and compare.
Ender
02-19-2009, 08:45 AM
Yeah, anything's possible. See if you can't look up info/instructions for that particular tach and then find out how to set it for 4/6/8 cylinders, it may be set wrong. I don't remember which setting is appropriate for stock FC timing, but I'm pretty sure one of them is (I think it's 4cyl).
Caim
02-19-2009, 02:09 PM
Easy way to tell is if it is at 0 when the car is off. If it is then make sure that it is connected right. Go from there.
Roen
02-19-2009, 02:21 PM
FC's should be set at 4 cyl for tachs.
Flooder
02-19-2009, 05:57 PM
Are you getting the tach signal from the trailing coil? If not that could be why.
Nopis1O
02-19-2009, 07:12 PM
I think im going to reset it to make sure its on 4cyl cuz im almost poss. its on the trailing coil but i will check that too. Thanks Guys!!
Flooder
02-19-2009, 07:14 PM
Theres also a check connector that you can connect it to to receive a tach signal. It should be on the drivers side of the engine bay, and its a green plug. Look into that as well.
Max777
02-19-2009, 09:38 PM
this is that carbed N/A btw, the stock coils have been replaced with MSD super blasters...


...or whatever.
Nopis1O
02-20-2009, 02:55 AM
yea thanks max. did you think that idle sounded like it was at three k?
RETed
02-20-2009, 04:48 AM
Plugged into the STOCK leading coil check connector - "4 cylinder".
Plugged into the STOCK trailing coil check connector - "8 cylinder".

If you're using a distributor that uses one coil for leading and one coil for trailing, it should be "4 cylinder".


-Ted
Max777
02-20-2009, 07:45 PM
well, i dont know what a 3k idle sounds like with exhaust, but my car was pretty loud when I first got it running.

It only had an open header back then, and was idling roughly at around 2,800 rpm. I had a bad TPS and aparently a vaccum leak.