Hi, I have an 89 YJ that after I shut off the ignition it will keep
turning for a few seconds and then shut off. Not sure if it needs a
tune-up or fuel or something else. Also lately has been running
sluggsh and hearing some exhaust noise from the engine bay. It sounds
like it's coming from the manifold. May be related but not sure! I
drive this thing 40-60 miles daily and has not given me any problems
til now.

 

lee wrote:
> Hi, I have an 89 YJ that after I shut off the ignition it will keep
> turning for a few seconds and then shut off. Not sure if it needs a
> tune-up or fuel or something else. Also lately has been running
> sluggsh and hearing some exhaust noise from the engine bay. It sounds
> like it's coming from the manifold. May be related but not sure! I
> drive this thing 40-60 miles daily and has not given me any problems
> til now.

It's called dieseling and can be caused by a bunch of things. Usually
it is due to bad seals in the carb. Might check the manifold for cracks
but dollars to donuts you need to rebuild the carb.

Sluggish could be a clogged cat or vacuum leak at the base of the carb.
When you rebuild it don't reuse the old gasket, put in a new one.
The easy way to check for a vac leak is start the engine and spray
carb-cleaner around the base of the carb. If the engine hessitates you
found a leak.

It's been a long time since I worked on carbs, there are several others in
this newsgroup that have probably done one this year and have more current
braincells than myself. :)

--
DougW

 

lee wrote:
> Hi, I have an 89 YJ that after I shut off the ignition it will keep
> turning for a few seconds and then shut off. Not sure if it needs a
> tune-up or fuel or something else. Also lately has been running
> sluggsh and hearing some exhaust noise from the engine bay. It sounds
> like it's coming from the manifold. May be related but not sure! I
> drive this thing 40-60 miles daily and has not given me any problems
> til now.

It's called dieseling and can be caused by a bunch of things. Usually
it is due to bad seals in the carb. Might check the manifold for cracks
but dollars to donuts you need to rebuild the carb.

Sluggish could be a clogged cat or vacuum leak at the base of the carb.
When you rebuild it don't reuse the old gasket, put in a new one.
The easy way to check for a vac leak is start the engine and spray
carb-cleaner around the base of the carb. If the engine hessitates you
found a leak.

It's been a long time since I worked on carbs, there are several others in
this newsgroup that have probably done one this year and have more current
braincells than myself. :)

--
DougW