89 Grand Tankoneer Engine Stuff - JeepForum.com
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post #1 of 3 Old 02-05-2011, 09:14 PM Thread Starter
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1994 ZJ 
Join Date: Sep 2010
Location: Omaha
Posts: 110
89 Grand Tankoneer Engine Stuff

Obviously the beast has the AMC 360 in it. Everything is stock.

I've done tons of mechanical stuff for many years, but I'm not familiar with this drive-train. So I've got some questions here.

1. I've got a slight shudder at idle. Not bad, and it sure seems to smooth out nicely at speed, but it is noticeable. I've got new plugs & wires, but is there something else likely? Or is that just typical of this engine?

2. Is there any good reason to install a performance coil? There is nothing wrong with the stock coil, so I don't need to replace it. On this particular engine, is it worth it?

3. This vehicle came from Co Springs, and supposedly has some sort of "high altitude adjustment" on it. What is that supposed to be? I don't see anything unusual on the engine, so is it something internal in the carb?

Any other thoughts or suggestions?

Thanks guys!

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post #2 of 3 Old 02-06-2011, 06:32 AM
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1979 CJ7 
Join Date: May 2008
Location: Alpine, Tx.
Posts: 3,195
I think the altitude adjustment is as simple as telling the computer you are at altitude by grounding or ungrounding a particular wire. That's the way it is on my CJ, so perhaps the same.

79 CJ7 "CJ Express" 4.2L, NV4500, D44 rear
69 800 with SBC, SM465, NP205, 14BT
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post #3 of 3 Old 02-06-2011, 10:24 AM
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1978 J-Series Truck 
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Location: Dillon, CO
Posts: 650
the carb could (and should) be adjusted for high altitude if it came from co springs. which could be different rods and jets and springs. which could explain your hesitation and stumble just off idle. mine was set up for 8k feet and i had it brought to ny (1500 feet). had a bad stumble and erratic idle. i had to adjust the carb and the idle mixture screws and gtg. many people choose to upgrade to a hotter ignition (dui, msd, teamrush, etc) personally i cant leave stock alone, i have to upgrade
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