jeep YJ distributor problems - JeepForum.com
 
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post #1 of 3 Old 12-27-2012, 08:46 AM Thread Starter
JeepYJ2013
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jeep YJ distributor problems

Hi All,

I am new to this forum and im looking forward to the help. I have a yj 1987 4.2 and I took the distributor out and replaced it with a new one. One big problem, i did not remember what position it was in when I pulled it out. I it keeps backfiring and breaking my starters, im on the 3 one. Any advice or help would be greatly appreciated.

Thanks
Big T

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post #2 of 3 Old 12-27-2012, 06:56 PM
laybackman
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Quote:
Originally Posted by JeepYJ2013 View Post
Hi All,

I am new to this forum and im looking forward to the help. I have a yj 1987 4.2 and I took the distributor out and replaced it with a new one. One big problem, i did not remember what position it was in when I pulled it out. I it keeps backfiring and breaking my starters, im on the 3 one. Any advice or help would be greatly appreciated.

Thanks
Big T
You have a distributer placed improperly into a 'disturbed' engine.



Pull#1 spark plug. Insert finger in #1 spark plug hole. Turn engine with socket andbreaker bar until you feel a whoosh of air pushing past that finger in #1cylinder. Remove finger and drop a long bladed screwdriver or wooden dowel into#1 cylinder. Slowly bring #1 piston up to TDC. That is where #1 piston is atits highest point. This engine is now at TDC on the compression strokeof #1 piston. Now check your timing marks. They should indicate that you are at TDC also. And your rotor should be at ornear #1 tower of your distributer cap.



Ifnot something has moved. Did you just pull the distributer? Then it is inwrong. Or you could have a timing chain that is stretched and has ‘jumped time’or a possibly a stripped distributer drive gear.



Nowmark base of the dist below where #1 plug tower is on dist cap. Next removedist cap. Place dist in engine getting the rotor to point at the marked spot onthe base of the dist or just before it actually. Nowbefore you stab the dist. into the engine you need to back off the rotorposition a little AND make sure the oil pump driveshaft slot is in the rightposition also.

Where you start is not where the rotororientation will end up because of the helical cut gears. The dist. shaft willhave to advance some because of that gear design to end up in the rightposition. If you leave the rotor on the dist. you will see that advancingmovement.

Onceyou have the distributer in, tighten down the dist hold down bolt until it issnug but not tight. Slap on cap, and try to fire her up. You may need to movethe dist some if possible until she does fire up. Then set your timingto whatever the specs are, IF possible. On later vehicles timing is governed bythe 'brain' and is not adjustable.

Do you know what was good about the good old days? I wasn't good, And I wasn't old!

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post #3 of 3 Old 12-27-2012, 08:50 PM Thread Starter
JeepYJ2013
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1987 YJ Wrangler 
 
Join Date: Dec 2012
Location: Middletown
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Thank you for the feedback I plan on working on the Jeep tomorrow. I will let you know how it goes.
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