Confused, what year did AMC start using the ECM (computer) - JeepForum.com
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post #1 of 48 Old 08-20-2008, 05:05 PM Thread Starter
SlikRic
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Confused, what year did AMC start using the ECM (computer)

I've been searching and cannot find a definitive answer 81', 83'???
the reason I ask is


But I also have these





Now correct me if I'm worng, but am I not running the ECM on a 80' CJ-7

Thanks for the responces
Rick


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post #2 of 48 Old 08-20-2008, 05:07 PM
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Im pretty sure it was 1981
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post #3 of 48 Old 08-20-2008, 05:36 PM
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I thought it was '83

Is that the original grill?

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post #4 of 48 Old 08-20-2008, 05:49 PM Thread Starter
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Quote:
Originally Posted by j33pman View Post
I thought it was '83

Is that the original grill?
Per my PO, I am the 3rd owner and it is all original, but that is why I have the question. When I went to replace the valve cover I had to get an 82' gasket and it still didn't fit perfect but I was able to trim it down a little and no leaks, so it worked.

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post #5 of 48 Old 08-20-2008, 06:07 PM
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The silver box in last pic is not a ECM it is a ignition control module. The ECM is located behind the glove box on top of the heater duct. If you have a large grommet with a big wiring harness going into you firewall on the passenger side then your probably have a ECM controlled CJ. The use of a ECM was not introduced till the 1982 models.

Craig
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post #6 of 48 Old 08-20-2008, 06:18 PM
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Craig wins! And for the record, just because it is "Emission Controlled" doesn't mean it's Computer controlled. See all those vac hoses and solenoids, and canisters, and egrs, and delays and mini valves, and and and and ......

It's ALL Emissions related.
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post #7 of 48 Old 08-20-2008, 06:28 PM
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Quote:
Originally Posted by craigb86 View Post
The silver box in last pic is not a ECM it is a ignition control module.
Correct - not the same thing. If you're running the stock distributor, you need the silver box regardless of what is going on with your carb.

If your vacuum advance is plugged off, your engine performance will suffer from a rpm standpoint. You want to get a line back on there, unless someone capped it because it was non-functional?

This is how NAXJA Midwest Chapter elected officials like to treat their resident users and former multi-year supporters.


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post #8 of 48 Old 08-20-2008, 06:34 PM
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Those wires look just like the factory Non computer set up used from about '78 up.

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post #9 of 48 Old 08-20-2008, 06:36 PM Thread Starter
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Thanks guys, Fatman do you know what I can get rid of? I don't have any testing here id Fl, so I would like to strip anything I don't need. I will check the firewall for the big grommet and harness. Would I benifit from doing the Nutter bypass with the ICM?? Thanks again guys.

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post #10 of 48 Old 08-20-2008, 06:54 PM
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Quote:
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Thanks guys, Fatman do you know what I can get rid of? I don't have any testing here id Fl, so I would like to strip anything I don't need.
I'll tell you, like a very smart & respected JF member told me 1 1/2 years ago, 'you need to have a complete understanding of your emissions system, before you make the decission to start removing anything'.

And here's a good site to get that education:
http://home.sprynet.com/~dale02/list.htm

I've posted a few schematics in the past, do a search. Mike Romain and John Strenk have some fantastic information on the subject.

Quote:
Would I benifit from doing the Nutter bypass with the ICM?? Thanks again guys.
You don't have a computer, there is nothing to "nutter"
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post #11 of 48 Old 08-20-2008, 07:20 PM Thread Starter
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Thanks Fatman, been reading parts of that page for a couple months, when I get the time. Will check it out some more!

Oh anyone have comments on the vacuum advance being pluged?

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post #12 of 48 Old 08-20-2008, 07:50 PM
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Quote:
Originally Posted by craigb86 View Post
The use of a ECM was not introduced till the 1982 models.

Craig
incorrect
1981
at least for Calif models
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post #13 of 48 Old 08-20-2008, 08:25 PM
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You need the vacuum advance connected to the distributor. Performance and gas milage will suffer otherwise. As mentioned. Make sure it works. Note, there will be no vacuum at idle, the throttle has to be open for it to work.

In 81 the computer was mounted on top of the drivers fender by the horn.
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post #14 of 48 Old 08-20-2008, 08:46 PM Thread Starter
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Quote:
Originally Posted by craigb86 View Post
The silver box in last pic is not a ECM it is a ignition control module. The ECM is located behind the glove box on top of the heater duct. If you have a large grommet with a big wiring harness going into you firewall on the passenger side then your probably have a ECM controlled CJ. The use of a ECM was not introduced till the 1982 models.

Craig
OK, ECM located behind the Glove BOX???

John Strenk Quote
In 81 the computer was mounted on top of the drivers fender by the horn.

Does anyone have actual Documentation of the actual location

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post #15 of 48 Old 08-20-2008, 08:52 PM
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Quote:
Originally Posted by SlikRic View Post
Does anyone have actual Documentation of the actual location
Based on what people are posting about when ECM's were first used, it sounds like you're looking for something that isn't there if you have a 1980.

This is how NAXJA Midwest Chapter elected officials like to treat their resident users and former multi-year supporters.


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