Question about 1991 Honda Accord

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91 honda accord shuts off when warm

I have a 91 Honda accord, standard. The car automatically shuts off after the engine warms up. What could be some of the issues i am facing???

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  • joesutton Jul 09, 2008

    when mine warms up the rpm guage jumps, then when i hit the gas it chokes out and dies, then wont start for an hour.



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I assume this car is fuel injected. Honda's and Acura's have what is called a "main relay". Actually two relays in one package. One half controls whether the fuel pump runs or not and the other half can interrupt power to the fuel injectors. This is a dual purpose set of controls to do the same thing. As a computer controlled engine rev limiter it can kill one relay and cut power to the fuel pump which will slow the engine speed. If the owner or a mechanic has direct-wired the fuel pump (and so it doesn't cut off when the relay tells it to) the computer can then kill the other relay and cut power to the injectors, stopping fuel flow and slowing the engine speed. Relay contacts can fail and so can the solder connections where they attach to a circuit board inside this dual relay "pack". The result in the same. Intermittent fuel pump operation or no power to injectors, and usually heats up and fails, cools off and works again.

Posted on Jan 01, 2012

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It might be the TCU it seems that many of them fail at about 100-150k miles. it is located under the carpet on the passenger side floorboard. over time the heat from the catalytic converter causes it to fail. Although it might be able to be repaired you are probably better off buying a rebuilt one from a parts place (try ebay) They are very easy to install. and can solve a host of problems.
I've owned 2 90's accords and both developed this problem at about 125,000 miles.
Good Luck.

Posted on Dec 20, 2011

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Notice that this problem is with the 91 Accords, that have an ignition coil in the distributor. I replaced mine and the problem is now gone. Had the same chokes out and dies, then wont start for an hour problem. Now solved with a new coil.

Posted on May 14, 2009

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I would suggest you check the main relay which is under the dash, left of the steering wheel. Red or black plastic box. Remove the cover and check for broken solder joints, or just replace the relay if that is the issue.

Posted on Jul 14, 2008

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