Anti Diesel Valve?
Printed From: TheAMCForum.com
Category: The Garage
Forum Name: AMC 6 Cylinder Engine Repair and Modifications
Forum Description: AMC-made I-6 engine mechanical, ignition and fuel from basic repair to high-perf modifications
URL: https://theamcforum.com/forum/forum_posts.asp?TID=97186
Printed Date: Apr/23/2024 at 3:29pm
Software Version: Web Wiz Forums 12.03 - http://www.webwizforums.com
Topic: Anti Diesel Valve?
Posted By: jdarosa
Subject: Anti Diesel Valve?
Date Posted: Nov/07/2018 at 8:02pm
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I just picked up an excellent '87 Eagle, all stock. Great condition, but diesels after I turn it off. I took it in for a carb adjustment, mechanic tells me the anti diesel valve is fried and needs to be replaced, but the carb looks new so he thinks it's a wiring issue. Anyone have any experience here? I have another carb, but have no idea about this anti diesel valve. Thanks!  ------------- 1968 American 440 – 232/AT 4dr |
Replies:
Posted By: Ollie
Date Posted: Nov/07/2018 at 8:18pm
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Sounds mighty crazy to me !! I think you got a timing issue. I would time it with a vacuum gauge as it may have a different cam. Also you may have a vacuum leak as there is alot of hoses on that car. My guess its not a wiring issue. Having AMC Fun, Ollie PS Nice looking car by the way
------------- 1966 American Convertible -- "The Rambler"..SOLD 1974 Postal Jeep -- "Rapid Delivery"...SOLD 1969 Rambler 220 post car--"Road Warrior" 1989 Jeep Comanche Pioneer, 4.0L, auto, 2wd |
Posted By: Trader
Date Posted: Nov/07/2018 at 10:49pm
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Looks real good! Low mileage, short trips? Lots of carbon buildup - highest, combustion cleaner and a long run. Or take the head off and clean it. That's if everything else looks as pristine under the hood as the exterior. |
Posted By: pacerman
Date Posted: Nov/07/2018 at 11:26pm
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The throttle position solenoid is what your mechanic may be referring to. When correctly adjusted it sets the normal hot idle speed of the engine (holds the throttle open for normal idle) while the ignition is on. When you turn the ignition off, the peg on the solenoid relaxes the throttle setting to the completely closed position to hopefully eliminate run-on (dieseling). It is easy to test the solenoid. If the solenoid is set properly, with the engine warm and idling normally, just disconnect the power to the solenoid. The engine should die. Get a service manual and learn how to set the carb up normally. Joe ------------- Happiness is making something out of nothing. |
Posted By: FSJunkie
Date Posted: Nov/08/2018 at 1:19am
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Actually I think the four cylinder Eagles had a dedicated anti-Diesel valve. It was similar to the PCV shutoff solenoid on the six cylinder engines. In fact, I think the anti-Diesel valve was a kind of shutoff valve on the PCV hose that the EEC computer energized when the engine was shut off to block PCV airflow that could cause Dieseling. The Sole-vac throttle positioner assembly has nothing to do with preventing Dieseling. It just kicks up the idle speed when electrical accessories are turned on, when the steering wheel is maxed out to one side, or when the engine is started. ------------- 1955 Packard 1966 Marlin 1972 Wagoneer 1973 Ambassador 1977 Hornet 1982 Concord D/L 1984 Eagle Limited |
Posted By: amcfool1
Date Posted: Nov/08/2018 at 6:26am
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hi, the PCV shut off solenoid was recalled by AMC, clogged up too often. gz ------------- george z |
Posted By: jdarosa
Date Posted: Nov/08/2018 at 7:28pm
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Thanks everybody. I'm going to work through these one by one and see how it goes. ------------- 1968 American 440 – 232/AT 4dr |
Posted By: farna
Date Posted: Nov/09/2018 at 7:33am
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What you really need is a TSM for your car (Technical Service Manual -- what AMC called their factory repair manuals). This is especially true for one of the late model smog cars! The Chilton's and Haynes books don't give enough info. You will need an M.R. 251 manual, NOT the cheaper M.R. 254 (251 is mechanical, 254 is body). Here is one on e-bay: http://www.ebay.com/itm/1983-AMC-Eagle-M-R-251-Workshop-Manual-Mechanical-MR251-Original/123164972089?hash=item1cad345439:g:~FkAAOSwMM9bEIF0:rk:49:pf:0" rel="nofollow - https://www.ebay.com/itm/1983-AMC-Eagle-M-R-251-Workshop-Manual-Mechanical-MR251-Original/123164972089?hash=item1cad345439:g:~FkAAOSwMM9bEIF0:rk:49:pf:0 ALL the missions system must work or one thing has a subtle affect on another and none of it will work exactly right. Start by replacing all the vacuum hoses, then test the systems one by one and repair as needed. IIRC they emission system is GM based, making parts easier to find, but you have to know what to replace! The TSM has all the test procedures, and it's not all that hard to do IF you have the TSM and a little patience. ------------- Frank Swygert |
Posted By: amcfool1
Date Posted: Nov/09/2018 at 10:40pm
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hi, the late computer (84+) is FORD based, and believe it or not, still available at any auto parts place, about $200. That 84+ TSM is a piece of work! about 3" thick, I have one, it's all in there. good luck, gz ------------- george z |