My Car Rumbles When Its Off :(

[punchy111]

whats going on?

 

when i have been for a drive i turn the ignition off and sometimes the car will round allmost as if it is starting again or turning over again. it kind of rumples and jumps for a few seconds. it doesent do this every time but just on occasions.

 

anyone know wahts going on?

 

cheers

Edited May 29, 2009 by punchy111

[beerhead]

They commonly call this "dieseling on" on a petrol motor. It's formed by red hot carbon deposits on your pistons or your valves being hot enough to spontaneously burn the fuel air mix as it comes into the motor.

 

Not a real drama.

[dbr11k]

also can be caused from not adding valve saver (i don't know what sort of car you have but yeah)

 

basically wears your valve seats out

[beerhead]

Most toyota motors past 1970 run hardened valve seats out of the box and don't need modification to run unleaded fuels. So you're wasting money if you're putting valve save through your 4K.

[love ke70]

how much ignition timing are you running and what fuel?

it will be an issue when the bastard wont stop :rolla:

[philbey]

Yeh, sounds like a timing issue, and it's probably running rich.

[Felix]

Idle cutoff solenoid?

[PMP020]

also check for vaccum leaks.

 

my 3k was doing this many years ago when i first bought my wagon.

i realised it became worse after i desided to steam clean the engine bay ?

 

turns out my carby and inlet manifold wererealy only being held on my crud, they were so loose it was running stupidly rich and on shut down was still sucking enough air to make it bang.

 

moral of the story, check that your carby and inlet manifold are tight.

then check mixtures and timing.

 

cheers, scott