Ive got a 67 200ci auto that most of the time when I turn it off, the engine shakes and then sounds like something is releasing pressure then you smell this weird smell after it finally shuts down... Like oil or gas smell maybe. So this only happens sometimes not all the time and the "process" starts right as I turn the key to off and it lasts a second or two. It seems to be totally random as to when this happens too, any ideas? Do you think it could be dieseling? Or could it be me using regular gas?

 

does it act like it wants to stay running? If so your idle is too high.

 

yeah, idle is set too high, any idea of what its set at? it should be under 1000 rpm. around 600ish

 

No the idle is set in a good spot, so its something else... Just what! Hahaha
The car doesnt seem to want to keep running, the engine just starts to shake and then there is that pressure release-ish sound then its off. It only happens occasionally so it doesnt happen every time its totally random.

 

What's the ignition timing?

 

Hey guys, well today I turned my car off and it did this longer than its ever done... like 4-5 seconds. But this time, since it was so long for me to hear it for once, it sounded like the engine was still firing but struggling to do so, really struggling... enough to shake the car. Do you think the carb isn't closing and still letting in air/gas in?

 

Mine does that every so often. Engine is at too high of an idle when you turn it off. All 3 of my carbs have done this.

 

do you have a tach set up?

 

No I dont. Ive just used a portable one to check it. I want to add one tho!