She still rumbles off

683 Views 12 Replies 4 Participants Last post by Guest, Mar 27, 2001

Discussion Starter · Mar 27, 2001

Well I worked over the weekend and tried to get the timing adjusted to a point where the engine would cut off cleanly.

I have had no luck.

History:

I have a 65 I6 with a new dist. and carb. I have the engine running very nice. But when I shut the car off it rumbles and cough's off. Not every time, only once or twice in about ten tries. It seems to burp more if the engine was pushed hard during operation.

I posted last week and was told it was probably that the timing was too advanced. I retarded the timing and am still having the problem. It seems the timing is not the source, I treid several different positions on the dist, and it was worse both the lower and higher I went.

Any other suggestions.....?

Jimbo65

65 I6 200 Coupe (Daily Driver)

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Discussion Starter · #2 · Mar 27, 2001

I'm having a similar problem with a 390 that I recently dropped in a 76 pickup I have. I get it to shut off without dieseling but ping under power, or, after changing the tiiming have the higher speed power but the rumble afterwards. I'm beginning to suspect that I have the wrong distributer in the thing.
I'll be interested to hear the outcome on your dilemma.

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bishir

· #3 · Mar 27, 2001

Dieseling....... you could have excess carbon build up in the engine. Try leaning out your fuel mixture some. Don't try a engine treatment because it could make it worse. After time it should go away.

See my 69 convertible and the VMF parking lot at: http://www.geocities.com/Bishir1/FrontPage.html
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Discussion Starter · #4 · Mar 27, 2001

I have not been able to get rid of the dieseling at any timing setting, high or low.
I feel it has to be carb related, as I've tried the other options....!

Jimbo65

65 I6 200 Coupe (Daily Driver)

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bishir

· #5 · Mar 27, 2001

I didn't say anything about timing. I WAS talking about your carb. Jesh

See my 69 convertible and the VMF parking lot at: http://www.geocities.com/Bishir1/FrontPage.html
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i967mustang

· #6 · Mar 27, 2001

Hi, try turning down the idle a little bit it should go away. John

Opal frost pearl metallic 67 coupe http://www.jps.net/binay/webdocs/febef75b01.JPG
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Discussion Starter · #7 · Mar 27, 2001

Sorry Bishir, the timing comment was regarding the earlier post. I KNOW what you were talking about and appreciate the comments as always.

Thanks

Jimbo65

65 I6 200 Coupe (Daily Driver)

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Discussion Starter · #8 · Mar 27, 2001

What kind of gas are you using. My I-6 does that if I use low grade gas. It stops if I put mid grade gas.
don't know if that will help or not.

1968 Coupe, 6cyl Std, Bench Seat. Driven through 10 years of College.

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Teebone

· #9 · Mar 27, 2001

It's called dieseling..you could possibly have a ton of carbon built up on the valves..it glows red hot and ignites any fuel left in the cylinder, even after you turn it off..another source of this problem could simply be your idle is too high

'59 T-Bird..[color:blue]'70 Mustang Convert</font color=blue>...[color:green]'72 Mach One</font color=green>
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Discussion Starter · #10 · Mar 27, 2001

What do your spark plugs look like?

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Art

· #11 · Mar 27, 2001

Set the idle down or install an anti-diesel solenoid.

Required tools for operating a Vintage Mustang:
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Discussion Starter · #12 · Mar 27, 2001

If it is dieseling from excess carbon buildup, try this. with it running (adjust the idle up so its running pretty briskly) spray some water from a Windws bottle or something at the air cleaner. Keep at it..sometimes you'll hear the engine speed up from the increase in compression...other times you'll hear it seem to bog down (little too much water). What this is doing is increasing the compression in the cylinder and the steam created will also tend to break up carbon deposits. You may even see some black soot coming out of the tail pipes. And in case having you engine ingest water freaks you out, dont' worry. Lots of racers (especially turbo guys) use water injection ...simply to cool the mixture and increase compression. Just don't dump a bucket on it or turn the hose on it.

1970 Fastback, 4V 351C, various colors with black interior

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Discussion Starter · #13 · Mar 27, 2001

UPDATE:

I fixed the deiseling problem this morning.
It WAS idling too high. I also leaned up on the fuel mixture.
Add to that the choke lever on the carb was sticking in the not quite all the way open position. Causing the engine to run high
and shut off roughly.

After tweaking the RPM and fuel mixture, I drove around all day and have not had one pop.

Thanks for all the great advice.
The sixer is running great, and I am finally cruising around with little or no worries about stalling or not starting anymore.

What a feeling, when all is well......!

Thanks again

Jimbo65

65 I6 200 Coupe (Daily Driver)

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