If the poster is running a 1986 his system is runnign 3 deg mech advance, normal vac advance if not screwed around with, due to "x" computer user finds needs far toooooooooo much initial advance that does not change or work with engine needs.....
Combine this with a Weber carb that will supply more fuel and it fall flat in its face in short order. It is easy to change if you know how.
HI, Remember me?
Well, first Mech said it was in the carb. The second Mech (speed shop) did not touch the carb, it was in the ignition. At the same time, I had him put in my HEI (ebay unit $65) so I don't know what exactly was wrong with it. Also new plugs and wires. I only drove it home about a mile, but it seemed to start alot easier. When I get some time I'll take it out for a good run. The HEI unit is huge compared to the old dist. My tach is working. The only thing I don't like is the numbers he wrote on the cap and body, I'll have to try and get them off. Also, noticed no more vacuum advance. I'll post back after I run it for awhile and let you know how its working. Thanks for all the help. Sorry for things getting ugly in this thread. Remember, we are all JEEPERS!
WAXER
Yep,... sorry too
after the computer is removed there needs to be ignition work. Its a realy big issue.... I have helped on way over a 100 of them. Sorry to say... we have gone from far
too little advance control in the X Computer Duarspart to the other end.
HEI Distributor......These are known for having
far too much advance control. The solution after installing these is to remove the vac advance becaus it will rattle if it is used. The GM HEI type of dist uses and activates on a much lower vac level than the Ford/Jeep DuraSpark Distributor..... so the HEI will add vac advance way too early and at a lower vac signal.
In addition to the vac level issue they are known to have up to 45 or 55 deg of advance. That is very high when compaired to the 33-35 deg the AMC engine should have.
There is a method to limit the vac level and to lower the over all advance. Many times I see double digit initial advance and that is high also... but you did not say... if you were not told, might want to get that info from the shop.
There is big issue with hardened gears on the HEIs that ARE MADE FOR THE AMC JEEP ENGINES.... petty wide spread on I6 and V8. The test is try to drill with std drill bit... if you get dimple it is good. If does not touch its going to eat you cam gear.
Thats a summary... you can read more and see pics and how to
JeepHammer’s Knowledge Base Web Site
http://www.junkyardgenius.com/ignition/jeep/HEIcompair.html
The numbers on the dist...
It is common to write the cylinder when doing a tune up. It shows the fire order if you know rotar rotation direction or see it. The numbers are written with a sharpe. If you take wires off the #1 cyliinder is front and the rear cylinder by firewall is #6 it can be usefull to have. The fire order is written on you intake and will follow the #1 cap/wire with the rotation.
I think its good to have... you #1 is usually marked in the cap plastic already.
Can remove the sharpy with a bit of brake cleaner on a paper towel and will wipe off like wet.... Just do it quick and leave it... brake cleaner not great for plastics. Will wipe off instant... I suggest you leave it once you understand what it is.
There may also be a initial advance number I will guess it between 9 and 14 deg and as said above I would like it to be much less.
... still suggest the holley low pres regulator. Summit Racing carries them, others and even WEber CArbs Direct carries them too.
Congrads on getting it running better,
Fred
And Last...
You stock DuraSpark Distributor.... if you are going to trash it... I would like it if still in one pc. Even the cap & rotar.... I need a oem one to cut window in for trouble shooting other jeepers that visit me here in MN. It will need to have the mech slot opened up and the rotar phase may need to be adjusted also. Rotar phase needs to be adj on the engine and that particular engine. Let me know.