ok before anyone ridicules me i used the search and didnt find what i was looking for so i recently did a rebuild on an 91 4.0 f***ed up on the rods so i had another set of rods in stock with new rings so when i popped out the old pistions the crank ended up being scorched up pretty bad so i put a new crank in with new bearings and new rod bearings reset the timing chain did the 15 pin measurement and ive been messing with the dizzy and i cant get it to start it will only pop fart and sputter it wants to kick over but it just wont stuff that has been replaced includes
starter
battery
fuel pump
ballast resistor
iac
tps
plugs
wires
cap
rotor
coil
cps
timing chain and gears
vaccum lines all replaced
thanks in advance every one im really stumped on this one

 

it'll be the dizzy. they are kinda a pita to set up right. totally unconventional to what we are used to.

 

ive tried the dizzy many different ways with the timing advanced and retarded it jus doesnt wanna fire

 

If I search for it I could probably find my pic, but the timing set (gears and chain) that I just recently purchased from Melling do not follow the 15 pin rule. There are 24 teeth on the crank gear and 48 on the cam gear, you must make sure the dots line up at their closest point of rotation. When you turn the crank so the cam dot is in the 3 o'clock position there will be 20 pins between the two dots.

Also, if the cam is not orginal (meaning aftermarket) it's most likely that the distributor drive gear is not indexed properly. You need to use a 3/16" pin inserted into the cam sensor and distributor body while installing the distributor into the block. As long as you use the pin it won't matter where you put the distributor in, you just need to make sure that you know the rotor will be positioned just past the #1 plug wire on the cap.

 

the cam is not aftermarket this motor was just running 4 days ago until i yanked it out to fix the death rod knock now its back in and i cant get it to fire up i did count 15 pins when the cam mark is at 3 oclock

 

Oh, okay. I must have misunderstood you, I thought you said you did a rebuild. So now that I understand that, did you align the cam sensor properly while installing the distributor?

 

Who's timing set did you use?

 

ive never even messed with the cam sensor the dizzy is out of a 94 in 92 motor in a 91 shell i have no idea what brand the timing set is its whatever one advance auto sells

 

The cam sensor ring is attached to the distributor rotor shaft and rotates with the rotor. Obviously it rotates independently from the distributor body. To align it properly you need to insert a pin 3/16" in diameter through the cam sensor ring into the distributor body. This will hold the cam sensor ring in it's correct position while insterting the distributor into the block. This is an important step and there is no "way around it". It's very easy and simple to do.

Only the very old timing sets used the 15 pin method as far as I know. I'm not saying that is your problem but I will find my picture to show you what I'm talking about.

 

Here, take a look at this:
https://www.cherokeeforum.com/f2/dis...roblem-110907/

And on a side note, one block was a '95 and the other was a '97

 

ok thank you very much i cant even explain how many times ive pulled out replaced rebuilt every piece of the drivetrain there were many sleepless nights and many dunkin donuts runs