89,comanche Comprssion stroke how many revolutions for tdc

[Jrwhite3230]

How many compression  strokes / revolutions for 4.0 6cyl to reach  (tdc) and does anyone  have  wiring schematics for Ignition system from start to run 

[Eagle]

TDC (top-dead-center) refers to the number one cylinder -- the one at the front. There are only two options -- the piston comes up and it's either an exhaust stroke or a compression stroke. Both have a TDC, but the one we want is TDC on the compression stroke.

 

You don't need more than two revolutions to get there. If the valve cover is off, look to see which cylinder has a valve open. For an inline 6, the firing order is 1-5-3-6-2-4. That means numbers 1 and 6 come up together, with one on compression and the other on exhaust. Whichever one has a valve open is NOT the one you want.

 

For the wiring schematic we'll need to know what year.

[Jrwhite3230]

TDC (top-dead-center) refers to the number one cylinder -- the one at the front. There are only two options -- the piston comes up and it's either an exhaust stroke or a compression stroke. Both have a TDC, but the one we want is TDC on the compression stroke.

 

You don't need more than two revolutions to get there. If the valve cover is off, look to see which cylinder has a valve open. For an inline 6, the firing order is 1-5-3-6-2-4. That means numbers 1 and 6 come up together, with one on compression and the other on exhaust. Whichever one has a valve open is NOT the one you want.

 

For the wiring schematic we'll need to know what year.

its  an  89jeepcomanche  pioneer 4.0 2w/drv