gstewart

i just got another cherokee with a 4 speed manual but it has the 2.5L in it and it came with a after market alpine security system i believe i have the whole thing out of it now but it has a computer from another jeep 2.5L 4wd and for some reason im not gettihg any spark from the coil even tho i replaced it with a good one. what the heck is wrong im beyond confused could i have a fryed wire somewhere because it will turn the engine over but just wont start???????

ol"blue

Maybe this will help. Click>--> Jeep Wiring diagrams

bushboy4003

You try replacing it or you didnt cuz thats the first thing i would do

gstewart

ya i put another coil in it still the same problem tho. should i be able to get spark from the ignition wire going to coil?

gstewart

hey thank you!

Mike1998XJ

Let's see... So the Jeep ran fine when the alarm system was in there? But now you took the alarm out and it has no spark. And it originally ran with the computer that's in it. So you replaced the coil even though it was working fine before you removed the alarm?
Do I have this correct? If so I think you can see where I'm headed... Trace back what you did to remove the alarm step by step. Verify any butt connectors you had to install are getting good contact and so on. Take your time, use a good light and let us know what you find...
Don't those alarms have wiring that hooks into the ignition switch? Can you turn the key and get anything to work? Like even a power window?

gstewart

i had the ignition wire cut at one point but i just twisted it together could that be part of the problem

Mike1998XJ

Go out and try to turn the key and let me know if anything electrical works. You could even turn it forward and listen to hear if the fuel pump cycles on. Write me back I will be here.
Mike

gstewart

well it didnt come with a computer so i bought one for it it will turn the engine over no problem and the reason i replaced the coil is the bolts holding it together were all rusted and the inside was all coroded when i got the jeep it wasnt running it was from an auction

gstewart

ya the fuel pump works iv heard that already the guages work

Mike1998XJ

OK, so since you've owned it the jeep hasn't ran. Let's start with the computer. Was it a new computer or at least close to the same year? What year did you say your jeep was?
To see if the computer matches you could pull the three large plugs off. Look at the pin side of the plug and then look at your computer pins. Is there a pin in each hole that matches? In other words we are just trying to verify that the computer is the right one.

gstewart

ya i guess everything works but the fact that i dont get any spark to the cylinders

Mike1998XJ

How did you verify that you don't have spark to the cylinders?

gstewart

my cherokee is an 86 and the computer is out of an 89 or a 90 cherokee

gstewart

i put a plug in the wire coming from the coil giong to the dist. and held it about a fourth of an inch from the engine block and had my brother in law crank it over and there was no spark