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davdwm
New User
Jan 21, 2008, 11:45 AM
Post #1 of 7
(2543 views)
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1991 dynasty ecu problem
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I have a 1991 dodge dynasty 3.3l v6,automatic trans,cruise control and no antitheft.Last July,2007...I went out to go to work,and,the car just started and died,over and over,would start and shut right down.towed to mechanic,who proceeded to troubleshoot:tac valve asmy,cam-map-crank-sensors decided it must be the ecu.To save me money got a used ecu,1991 new yorker,no.4686430,(I looked on casing later).I'm sure he used number off original.Anyway,It lasted four months.I stopped at a store,came out and the same problem.Starts up and dies right down over and over.Of course I called the same mechanic,who did some diagnostics and said its probably the used computer.So,we purchased a remanufactured ecu,at a higher price,and then it didn't start or would start sometimes and not others.He has replaced many parts that you would think pertain,asd,speed,etc..They thought it could be a bad injector,then,the harness itself.This has been over a month now,from about Dec.10,2007 to today,Jan 21,2008.
Any help would be Highly Appreciated,and I read where the revised sbec-4686442 could help!Can I use this in place of the 4686430 ecu? I'm in dire straights!! Please help!! Dave
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jan 21, 2008, 12:07 PM
Post #2 of 7
(2532 views)
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Re: 1991 dynasty ecu problem
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?? Is this unit placed down by passenger's kick panel? I've found those get wet and connetions bad - just a maybe??
T
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davdwm
New User
Jan 21, 2008, 12:10 PM
Post #3 of 7
(2530 views)
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Re: 1991 dynasty ecu problem
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No! This is in the engine compartment on the left hand side.
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DanD
Veteran
/ Moderator
Jan 21, 2008, 12:38 PM
Post #4 of 7
(2527 views)
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Re: 1991 dynasty ecu problem
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Here’s a service bulletin that I had on this; whether it’s the problem with yours I’m not sure but it sure sounds like by yours and their discretions.
Dan.
Canadian "EH"
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davdwm
New User
Jan 21, 2008, 3:47 PM
Post #5 of 7
(2523 views)
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Re: 1991 dynasty ecu problem
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Thanks for the reply! I did order one of these used online,even though they want to know the production date,so they give you the right part.up to 12/18/90 is the 4686430 and after 12/19/90 is the 4686442.I told him the latter just to get it.But,is it interchangeable with the 4686430. Remember,original went bad,replaced with same number,worked for four months,went bad with same problem.Got another,4686430 and got a different result,no start.The mechanic has the car so I don't know exactly what's happining,they play around and it starts,runs great,the next morning won't start.Let's keep looking for solutions.Thanks again,Dave
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murlran
New User
Aug 6, 2014, 1:40 PM
Post #6 of 7
(1601 views)
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Re: 1991 dynasty ecu problem
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Hello, looks like this post is very old, but did you change that SBEC to the 4686442 and did it solve your shutdown problem. I have a 1991 Dynasty now, with fairly low miles, and it has begun to start , then shutdown , after driving for months, and more than 6,000 miles. Thanks in advance , I am stuck and have replaced many parts , ignition, with no solution.
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 6, 2014, 1:42 PM
Post #7 of 7
(1600 views)
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Re: 1991 dynasty ecu problem
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Very old?...................... IT'S 6 YEARS OLD!!!
Please read the FORUM RULES before posting again.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Aug 6, 2014, 1:43 PM)
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