Im such a noob

[kazzx]

Fixing the timing on my MJ this evening after work. Has anyone done this? Tips? I have never even seen a timing gun. :oops:

[mjeff87]

it isn't adjustable (at least, in the traditional sense) The hold down clamp secures the distributor shaft in a fixed position, and the ECU adjusts/retards spark based on various sensor inputs.

 

What's leading you down this road? Give us some symptoms and we can help you troubleshoot possible causes.

 

Jeff

[fiscus]

Timing a 4.0L?

As stated above, it's self-adjusting & you shouldn't have to bugger with it.

The only way to really mess with the timing is to move the Distributor forward or backward a tooth. The stock Metal gears & chain should be good, never saw any go bad.

 

2.5Ls, on the other hand, have the plastic chain tensioner that wears out.

 

This link my proove helpful to you:

http://www.lunghd.com/Tech_Articles/Eng ... ostics.htm

[kazzx]

It sounds like its back firing in the engine.

[Duner]

There is nothing to do as far as timing adjustments go. Unless someone has had the the distributor out of the engine and moved it a tooth there should be know issue. Even when I screwed up the timing chain install and had one link too many between the marks the truck still started and ran it just seemed down on power in the lower rpm band, I even pulled a trailer loaded down with my brother's furniture to college and all I noticed was that I couldn't maintain 65 uphill with the air on without shifting to 4th gear. I couldn't believe how well it ran though after my dad pulled it off and properly lined up the marks and the timing chain links. The 4.0 litre really is hard to kill no matter what you try to do to it.

[kazzx]

So could be the problem be that when I was pressure washing the mud off I knocked something loose with the distro cap?

[Mitch]

It could just need to dry out....

[mjeff87]

You might have a misfire condition if your cap and or wires are in bad shape. Pop the cap off and see if there's moisture inside...if so, dry everything well (compressed air works well, then hose it all down with WD40 (the "WD" stands for "water displacement")

[kazzx]

Its been about 3 weeks since i pressure washed it so I don't think its moisture, maybe just faulty wired or distro cap. Looks like thats next.

[Frankensteinsmj]

Yes I agree with water in the distrib cap. also you might have broken vacuum lines or knocked sending unit wires loose.

[kazzx]

Its not starting at all now. It turns over, but doesnt fire up.

[Oizarod115]

Its not starting at all now. It turns over, but doesnt fire up.

 

wait, isn't this a CPS symptom? itll crank but not spark

 

Crankshaft position sensor... found on the bellhousing

 

someone else will know for sure.

[Pete M]

There are other potential problems along the path to getting spark. Could be a bad coil, or a problem under the dist cap. Were you spraying water inside the engine bay?

[Frankensteinsmj]

First pull the coil wire from the distrib and check for spark that will tell if its spark related.

[kazzx]

Pulled the distro cap and all is fine in that area.

[ComancheAssault]

There is nothing to do as far as timing adjustments go. Unless someone has had the the Distributor Clamp out of the engine and moved it a tooth there should be know issue. Even when I screwed up the timing chain install and had one link too many between the marks the truck still started and ran it just seemed down on power in the lower rpm band, I even pulled a trailer loaded down with my brother's furniture to college and all I noticed was that I couldn't maintain 65 uphill with the air on without shifting to 4th gear. I couldn't believe how well it ran though after my dad pulled it off and properly lined up the marks and the timing chain links. The 4.0 litre really is hard to kill no matter what you try to do to it.

 

Thanks also for the information you have provided. I am gathering notes on timing and would like to add these to my notes.