Weird vibrating on shut off

[wheese88]

Hey guys I googled and search but no avail. I am having a weird thing happen when I'm shutting off the truck. It's a small vibration almost like the truck doesn't want to turn off then finally gives in and turns off. So it's like a last breath kind of thing with a vibration like a struggle for life. Not sure what is going on.

Maybe I'm just being crazy. I'm also not sure what to look for. There are no codes or any lights flashing up.

Any help would be appreciated

 

[catrains]

sounds like dieseling . this is from deposits in the combustion chamber.

common with 1980 vehicles they had a solenoid that would help reduce this by closing the throttle plates.

possible you need some injector and combustion chamber cleaner. techron or regain has these chemicals to add to the gas.

 

[wheese88]

Thanks catrains. I was thinking the same thing just needed a second opinion.

Cheers.

 

[krunner53]

I've got the same thing going on

I was also thinking dieseling..Would running seafoam through the gas tank work? and/or seafoaming the engine?

 

[catrains]

I was also thinking dieseling..Would running seafoam through the gas tank work? and/or seafoaming the engine?

I never used sea foam. it is a solvent. some say it cleans injectors. not sure if it removes the combustion chamber deposits.