Wont start, not fuel pump, possible crank sensor???
Thread Starter
Seasoned Member
Joined: Jun 2011
Posts: 276
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From: Van Buren Arkansas, was Joplin Missouri
Year: 1990
Model: Cherokee
Engine: 4.0L
I haven't checked that yet. Its got new plugs and wires that I put in last month. That's one thing I'm gonna check tho. Can anyone tell me where the crank sensor is on a 1990 xj? 4.0l
CF Veteran
Joined: Nov 2010
Posts: 5,841
Likes: 117
From: In the middle of Minnesota!
Year: 1999
Model: Cherokee
Engine: 4.0
#1 thing to do is to pull a plug, place the plug electrode near a good engine ground, and have a buddy crank the engine while you watch.
You are looking for a strong, BLUE, snapping spark. Yellow/orange/white spark is a weak spark, which may not be strong enough to start the engine.
Start there. Test your way to a solution.
Do you hear the fuel pump energize and run for about 2 seconds when the key is turned to the ON position?
You are looking for a strong, BLUE, snapping spark. Yellow/orange/white spark is a weak spark, which may not be strong enough to start the engine.
Start there. Test your way to a solution.
Do you hear the fuel pump energize and run for about 2 seconds when the key is turned to the ON position?
Thread Starter
Seasoned Member
Joined: Jun 2011
Posts: 276
Likes: 0
From: Van Buren Arkansas, was Joplin Missouri
Year: 1990
Model: Cherokee
Engine: 4.0L
I pulled the fuel pump that I just replaced a month ago and it was still pumping but I took it back to the parts store and got a replacement an put it in last night. Nothing happened. Ugh this sux. I just moved to van Buren Arkansas from Joplin las Sunday and then it does this! Fml
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Thread Starter
Seasoned Member
Joined: Jun 2011
Posts: 276
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From: Van Buren Arkansas, was Joplin Missouri
Year: 1990
Model: Cherokee
Engine: 4.0L
Originally Posted by tjwalker
#1 thing to do is to pull a plug, place the plug electrode near a good engine ground, and have a buddy crank the engine while you watch.
You are looking for a strong, BLUE, snapping spark. Yellow/orange/white spark is a weak spark, which may not be strong enough to start the engine.
Start there. Test your way to a solution.
Do you hear the fuel pump energize and run for about 2 seconds when the key is turned to the ON position?
You are looking for a strong, BLUE, snapping spark. Yellow/orange/white spark is a weak spark, which may not be strong enough to start the engine.
Start there. Test your way to a solution.
Do you hear the fuel pump energize and run for about 2 seconds when the key is turned to the ON position?
CF Veteran
Joined: Jun 2011
Posts: 2,858
Likes: 1
From: Nor-Cal
Year: 1990
Model: Cherokee
Engine: The venerable 4.0
No need for a buddy if you just pour some gas in the t.b. really sounds like fuel. Do you smell gas when you crank for a while? I just hate checking spark that way. Only do that last cause coils don't go out allll that often.... plus I don't like getting shocked.... does happen.
Thread Starter
Seasoned Member
Joined: Jun 2011
Posts: 276
Likes: 0
From: Van Buren Arkansas, was Joplin Missouri
Year: 1990
Model: Cherokee
Engine: 4.0L
Yeah I don't wanna get zapped either. I think I'm gonna go bar hopping tonight then worry bout testing tomorrow. I hear the crank sensors go out often aswell. But I bought one just in case, 30.99 won't break me so I'll look at changing this. Anyone know how hard it is and where exatly it is??
CF Veteran
Joined: Jun 2011
Posts: 2,858
Likes: 1
From: Nor-Cal
Year: 1990
Model: Cherokee
Engine: The venerable 4.0
Originally Posted by 90xjcjf
Lol. I got skinny hands but not real small. Anyone got any pics. It's a 1990. Thanks