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Discussion Starter #1 (Edited by Moderator)
My buddy just put an sr-20det into his 91 240sx,
the car has spark in cylinders 1,2 and 4
but in cylinder 3 there is nothing
all of the 4 coil pack connectors are getting voltage! and it is similiar between all four four connectors around 12volts.
We switched the coil packs to make sure they were not faulty and they checked out ok, but still no spark on 3

We tested resistance in the wire from the ECU all the way to the coil plug but i dont know any specs.

The engine wont start it just backfires
we changed the ECU
the ignitor
and reset the CAS

please help me if you can. thanx


:confused:
 

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Are you sure you're not 180* off?

It takes 2 full revolutions of the crank pulley to get back to TDC if you were there to begin with, if you only did it once, you could be 180* off.

Pull the valve cover off and make sure the intake and exhaust cam lobes are facing away from each other when you bring it to TDC so you know you're at TDC on the compression stroke, not the exhaust stroke.
 
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