So i have a 88' xj with the 4.0 aqnd i just changed the spark plugs. I read all the info from my haynes manual and it said to put the gap at .035.
i did that and the damn thing still wont start. When i pulled the old plugs out they were gapped at .070. im not sure what to look for or anything. Or even where to start. the damn thing wont start though. It cranks over like it wants to start but just wont.

 

Did you get the plug wires back in the right places?

 

^x2 and make sure you got the firing order right. Apperantly, the book is wrong. #1 on the dizzy is at about 5 o clock

 

Like said, the Manual is dead wrong. #1 is at 5:00 as viewed from the side, 153624 clockwise is the firing order. (#1 is the front cylinder, then they go back)

 

Here's the correct diagram for you:

https://www.cherokeeforum.com/f2/new...4/#post2865829

 

 

Was it running before you changed the plugs?

 

Do you have spark? Are connections all firmly secured?

 

so i followed the book when i did it maybe that could be the problem. Ill check it out but how do you check if theres a spark. Do you pull a wire and just look at it?

 

Lots of ways to check. I use a timing light. You can use a spark plug hooked up and lay it on the engine.

 

Take out the plug, put the plug wire back on it, hold the plug by the wire (important-don't hold a metal part) and let it touch a ground (like the valve cover). You should see the spark.