TR4/4A TR4 diesels after shutoff

[derickson]

My '63 TR4 (freshly rebuilt) has always had a problem: once warm, it doesn't want to quit. After reaching normal operating temperature, when I turn the key off, the engine continues to cough and run (usually called dieseling, since there's no spark). I always turn it off and then let the clutch out to kill it. What's the root cause? I'm not running rich (checked with EGA).

 

[Keoke]

Hi Derickson,Sometimes dieseling can be the result of engine heat and high idle speeds or improper carburetor settings.Sometimes it is prevalent in a fresh engine and will subside after its broken in a bit. However, it is detrimental to the engine and your present method of terminating it is in wide use by the LBC comunity.--Fwiw--Keoke

 

[Sarastro]

Not only did my 66 TR4A diesel on occasion, but once in a while it would start as soon as I turned on the ignition--without using the starter. I guess the engine was in just the right position, turning on the key triggered a spark, and away it went.

 

[Tinster]

Not that the Crypt Car has that many miles driven
but Crypty always had a "dieseling" problem even
after new Jeff's new carbs, new dizzy, timing and
valve adjustment.

A tank of high test gasoline and the problem went away instantly. I'm on my second tank of high test and
the engine shuts down instantly.

d

 

[CaptRoy]

I just rebuilt mine and went through everything and I still run on a little... I plan to get a colortune next and see if I'm a little rich.. I also have the idle at 1100 and that may be part of the problem...

You're not alone!

 

[martx-5]

Here's some good info from Wikipedia that explains the several causes and potential fixes for running on or dieseling. /bcforum/images/%%GRAEMLIN_URL%%/smile.gif

There are also some good links at the bottom of the article.

 

[Kirk_Fisher]

Mine diesels on occassion. I have noticed that it is idling a little high becuase the accelerator sticks just a tad, so lift it with my toe and she idles down. I also wait about 10 seconds before I shut it off. If I do the above, she stops instead of dieseling.