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Old 01-19-2012, 10:21 AM
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89 Chevy TBI on an AMC - Lets figure how to trigger it.

Hey guys,

I think I have an idea....

I found a complete 89 tbi setup that I am just about 100% sure I can convert over to my rock crawler 304 AMC. All I really need to know is what kind of trigger it is looking for. I am thinking an electronic AMC distributor can be used to trigger it and all the sensors are easy enough to install. A little linkage work and I have a rock bouncer that will run at all angles and not stall on a climb sending me in the wrong direction. So, who knows the trigger answer? I suspect it is very simple, but I was not able to find exactly what I was looking for searching the web.

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Last edited by TurboS10; 01-19-2012 at 10:57 AM.
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Old 01-19-2012, 01:58 PM
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Maybe this will help you out.
http://www.bigscaryjeep.com/TBI_FAQ.html
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Old 01-19-2012, 04:49 PM
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Quote:
Originally Posted by TurboS10
Hey guys,

I think I have an idea....

I found a complete 89 tbi setup that I am just about 100% sure I can convert over to my rock crawler 304 AMC. All I really need to know is what kind of trigger it is looking for. I am thinking an electronic AMC distributor can be used to trigger it and all the sensors are easy enough to install. A little linkage work and I have a rock bouncer that will run at all angles and not stall on a climb sending me in the wrong direction. So, who knows the trigger answer? I suspect it is very simple, but I was not able to find exactly what I was looking for searching the web.
The megasquirt website was pretty good for info on that. The 8 pin gm module you have triggers on a falling edge,chances are if you can fit it on a heat sink you can run a AMC dizzy trigger wheel to signal it.
I tried to post the megasquirt website adress, but it came up as a porn site whoops. I will get back to you.

http://www.megamanual.com/ms2/GM_7pinHEI.htm hope this works

Badda bing it works.

Last edited by latech; 01-19-2012 at 04:54 PM.
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Old 01-19-2012, 09:21 PM
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That jeep site has some good info and outside links. I have not dug through it all.

The megasquirt is good information, but my plan is to use the factory gm ecu if I do it. I dont have time or patience for that much project right this minute, so i am wanting more of a drop in option. I'll see what I can find reading tomorrow. My thought was a 305 chevy tune on my 304 AMC might be the ticket since everything is drop in other than the distributor. I read that a factory amc electronic distributor will work, but I have to look into that one more.
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Old 01-24-2012, 08:44 AM
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You can mount the EST module on an aluminum heat sink plate anywhere and wire it to ECM and a coil like the stock GM or? Like in attached picture.

Or built a GM EFI distributor:
http://www.gearhead-efi.com/Fuel-Inj...BI-Conversions
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Old 01-24-2012, 08:58 AM
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I would suggest using a HEI distributor that is made for an AMC, I have seen them in Summit and Jegs.
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Old 01-24-2012, 06:51 PM
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dont AMC's use a star wheel reluctor with a magnet/pickup coil, just like the Fords do? don't they even use the same big module from ford?

I always use GM's 4 pin modules with them triggers, on fords, toyotas and some other japs, so if the reluctor can trigger the 4 pin module it will for sure trigger the 7 or 8 pin module of the TBI system, just wire it up and enjoy.

one thing, since there is no color coding, just wire it any wire with any module's leg, if it does not run smooth, just reverse the wires and you are set.
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Old 01-24-2012, 07:04 PM
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yes, in the late 70's, AMC adapted the Ford duraspark system. 1 of those distributors ( avail at the parts store ) can trigger an HEI modual. lock the advances and it'll work with the TBI
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Old 01-24-2012, 07:28 PM
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yes DURASPARK was the name of the ford ignition, they were fail prone here on the F-350 which was a very popular truck back in the days, I always throwed the duraspark module in the trash and installed a GM 4 pin module, they ran even better, so for sure you can trigger the 7 pin module and use the GM TBI
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Old 01-24-2012, 09:41 PM
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Yup, that's what the wiring diagram above is for...
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Old 01-25-2012, 10:51 AM
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There's an even easier way to get the correct trigger. Get an aftermarket GM-style HEI distributor for the AMC engine. Chinesium ones can be bought for under $100. Replace the four-pin ignition module with a seven pin unit, such as Standard Motor Products PN LX315 or ACDelco PN 19179581.



The seven pin module bolts right in place in the HEI distributor - no external wiring or heat sink needed. Pin the vacuum and mechanical advance units on the HEI distributor to lock them out (the GM TBI computer does advance electronically). You can even incorporate a knock sensor if you want. The pinouts on the seven pin module are the same as those on the Chevy TBI distributor. You can use the small harness and connectors from any Olds 307 or Chevy 305 with the computerized Q-jet (most 1981-1990 versions of these motors). You will need to cut a small notch in the HEI body where this additional four wire harness comes out. This has been done many times when adapting TBI to an engine not originally available with TBI. Also, consider starting with a PROM from a 305 truck (without VATS). Even the stock PROM will probably be close enough, and if you want to play with programming you can go from there.
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Old 01-25-2012, 11:29 AM
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problem with those aftermarket AMC distributors is that they do not have the correct distributor gear, they have 1 that 'works' for a while, but it will eat the cam gear.. It's a known problem.. There are gears that will work, the original might, but it might not. many of those distributors have a .500 shaft when it should be .490 to use the right gears.. It has to do with the hardness.

A rebuilt duraspark will drop in and work without an issue
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Old 01-25-2012, 01:54 PM
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Good info guys,,, I am digging this new engine gizzmo category
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Old 01-25-2012, 05:00 PM
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Originally Posted by Custom10
Good info guys,,, I am digging this new engine gizzmo category
Kool........
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Old 01-25-2012, 06:01 PM
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I mount the GM ignition modules on computer CPU (main procesor) heat sinks, they have lots of fins and make a great job of cooling the module down, smear a dab of heat sink paste to the module before you bolt it to the sink, also make sure the sink is grounded, the module takes the ground from it.
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