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-   -   Burned Distributor Cap Contacts (http://www.wranglerforum.com/f218/burned-distributor-cap-contacts-159328.html)

0regonjeeper 05-10-2012 12:18 PM

Burned Distributor Cap Contacts
 
I was just inspecting some things in my engine and I pulled the dist cap off and noticed that the contacts are burned and have black build up on them. It doesn't seem to be hindering the performance. The wire contacts are clean as a whistle and the plugs show the normal wear of a healthy engine (brownish tan stuff). So what's the deal with the dist cap? I'm running a Firepower ignition system with all the trimmings: coil, wires, cap, rotor all from performance distributors and the plugs are just cheap, run-of-the-mill and gapped out to .060.

Any ideas?

2.5L

kik 05-10-2012 12:42 PM

Could be normal discoloration. If you have a concern try a new cap. You didn't indicate how many miles on it. Maybe there is an increased spark making it "hot". No other idea. If it's running fine maybe try another cap or just leave it alone.

0regonjeeper 05-10-2012 12:50 PM

Quote:

Originally Posted by kik (Post 2354974)
Could be normal discoloration. If you have a concern try a new cap. You didn't indicate how many miles on it. Maybe there is an increased spark making it "hot". No other idea. If it's running fine maybe try another cap or just leave it alone.


It's only a year and a half old. I honestly have no idea how many miles. Used as a daily driver, the occasional hour-long trip to portland and back and the occasional not-at-all hardcore wheeling trip. It just seemed premature. How long are caps supposed to last?

kik 05-10-2012 02:05 PM

I've always seemed to replace mine nlt 15,000 max. If it's running good maybe it's ok.

baileysoffroad 05-10-2012 02:08 PM

Now it may be different depending who you ask but I believe the Haynes manual states a spark plug gap of .035 for the 2.5l......not sure how this would affect the point but I just pulled mine along with the distributor for cam removal and my points and rotor have fuzzy black build up but not much wear on the points or rotor themselves....ill post a pic when I get home later.

0regonjeeper 05-10-2012 03:24 PM

Quote:

Originally Posted by baileysoffroad (Post 2355206)
Now it may be different depending who you ask but I believe the Haynes manual states a spark plug gap of .035 for the 2.5l......not sure how this would affect the point but I just pulled mine along with the distributor for cam removal and my points and rotor have fuzzy black build up but not much wear on the points or rotor themselves....ill post a pic when I get home later.

Yeah the stock gap is .035 but the coil I'm running is nice and hot and performance distributors says I can run a plug with a max of .060 so thats what I did. Mine too has build up but not really and worn spots.

sevenservices 05-10-2012 03:37 PM

When I saw one do that it was because the small pin was missing on the rotor. It would still spark through the hole but the spark jumping gap made it all black inside the cap. By using the small pin that comes w/it, there isn't a gap.

Just an idea...


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