455 problems

mad_mike06 · December 4th, 2006, 02:22 AM

I have a 72 delta 88 with the 0riginal 455 and sometimes when i go to cut the car off, the engine makes a clunk noise and wont cut off. I can turn the key back to the on position and the car comes on like it wasnt off. does anybody know why and what i can do to fix the problem. 1 more thing... when i start my car warm or cold, grey smoke comes out the tail pipe for like 5 seconds. any suggestions...

462rocket · December 30th, 2008, 08:46 PM

It sounds like a timing problem . I'd get a timing light and check the ignition timing . and also if the engine is all original you could have a timing chain going bad .

64Rocket · December 30th, 2008, 09:54 PM

The smoke on start up is from the valve stem seals being bad. They get hard a brittle and crack off. Due to old and high mileage.
The run on after the key is off, is from carbon build up, most likely from the stem seals being bad. When the car is hot, this is common, also alot of slow driving doesn't help.
Might want to run some carbon cleaner thru the tank.

Gene

J-(Chicago) · December 31st, 2008, 12:03 AM

Check the timing and run a higher octane fuel as well. The higher the octane, the less it will want to run on when you shut it off.

MN71W30 · December 31st, 2008, 06:36 AM

Quote:

Originally Posted by J-(Chicago)

Check the timing and run a higher octane fuel as well. The higher the octane, the less it will want to run on when you shut it off.

Yep, It sounds to me like It is diesiling.

Techmaven · December 31st, 2008, 01:39 PM

He says it runs on when he shuts the key off. With the ignition off, there is no spark so timing is irrelevent. Running carbon cleaner is the first thing.

He also needs to check for high idle speed and also check everywhere for vacuum leaks. These three things are the biggest cause of "dieseling".

mugzilla · December 31st, 2008, 08:36 PM

Isn't there a idle stop (dash pot???) that allows the throttle blade to close completely when you shut the car off. I have A.C. car and I had a non-functional gizmo of this sort ..?

MN71W30 · January 1st, 2009, 12:01 AM

Quote:

Originally Posted by Techmaven

He says it runs on when he shuts the key off. With the ignition off, there is no spark so timing is irrelevent. Running carbon cleaner is the first thing.

He also needs to check for high idle speed and also check everywhere for vacuum leaks. These three things are the biggest cause of "dieseling".

It's unlikely but possible that late timing may help hide a pinging problem enough to fool a guy into thinking the cheap gas is working good enough. I've seen crazier things happen.

65Delta88 · January 1st, 2009, 10:03 AM

Yeah definately sounds like carbon build up, I would run sea foam through the motor to help clear the some of that carbon out.

hamm36 · January 1st, 2009, 09:25 PM

anybody look at the orginal post date. It is 2 yrs old.

71 delta88guy · January 4th, 2009, 03:55 PM

now that is funny.

J-(Chicago) · January 4th, 2009, 04:43 PM

MN71W30 · January 4th, 2009, 05:42 PM

All that technical advice wasted.

projectheaven · January 4th, 2009, 11:41 PM

It will help the next person that problem happens to.That guys probably not even around anymore though.

Oldsguy · January 5th, 2009, 10:00 AM

Quote:

Originally Posted by projectheaven

It will help the next person that problem happens to.That guys probably not even around anymore though.

EXACTLY

This is why some people on this site insist on ensuring information is correct and accurate, at the risk of appearing to be "snobby" or "know-it-all".

f-85 · January 5th, 2009, 10:19 AM

Watch the seafoam. I like it and use it on all my old cars when i first get them. I use the sea foam bofore i change the plugs. I have seen a few times the sea foam foul out the plugs. So sea foam fist, new plugs next. Then some burn outs! LOL

December 4th, 2006, 02:22 AM	#1 (permalink)
mad_mike06 Junior Member Join Date: Dec 2006 Posts: 3	455 problems I have a 72 delta 88 with the 0riginal 455 and sometimes when i go to cut the car off, the engine makes a clunk noise and wont cut off. I can turn the key back to the on position and the car comes on like it wasnt off. does anybody know why and what i can do to fix the problem. 1 more thing... when i start my car warm or cold, grey smoke comes out the tail pipe for like 5 seconds. any suggestions...

December 30th, 2008, 09:54 PM	#3 (permalink)
64Rocket Registered User Join Date: Sep 2006 Location: Union City Calif.94587 Posts: 301	The smoke on start up is from the valve stem seals being bad. They get hard a brittle and crack off. Due to old and high mileage. The run on after the key is off, is from carbon build up, most likely from the stem seals being bad. When the car is hot, this is common, also alot of slow driving doesn't help. Might want to run some carbon cleaner thru the tank. Gene __________________

December 31st, 2008, 12:03 AM	#4 (permalink)
J-(Chicago) Seasoned beater pilot. Join Date: Jan 2007 Location: Chicago Posts: 2,696	Check the timing and run a higher octane fuel as well. The higher the octane, the less it will want to run on when you shut it off. __________________ I'd rather have a numbers matching poker hand.

January 1st, 2009, 10:03 AM	#9 (permalink)
65Delta88 Registered User Join Date: Oct 2003 Location: Illinois Posts: 87	Yeah definately sounds like carbon build up, I would run sea foam through the motor to help clear the some of that carbon out. __________________ 1965 Oldsmobile Delta 88 -425 High Comp Motor Perfromer Intake Holley Carb -Tucking 295's in the rear

January 1st, 2009, 09:25 PM	#10 (permalink)
hamm36 Registered User Join Date: May 2008 Location: Dallas Posts: 338	anybody look at the orginal post date. It is 2 yrs old. __________________ 72 Cutlass Supreme - nothing more, nothing less.

December 30th, 2008, 08:46 PM	#2 (permalink)
462rocket Registered User Join Date: Dec 2008 Posts: 3	It sounds like a timing problem . I'd get a timing light and check the ignition timing . and also if the engine is all original you could have a timing chain going bad .

December 31st, 2008, 01:39 PM	#6 (permalink)
Techmaven Rocket Veteran Join Date: Dec 2008 Location: Long Island Posts: 40	He says it runs on when he shuts the key off. With the ignition off, there is no spark so timing is irrelevent. Running carbon cleaner is the first thing. He also needs to check for high idle speed and also check everywhere for vacuum leaks. These three things are the biggest cause of "dieseling".

December 31st, 2008, 08:36 PM	#7 (permalink)
mugzilla is Fast Enough ... Join Date: Jul 2008 Location: dogtown Posts: 843	Isn't there a idle stop (dash pot???) that allows the throttle blade to close completely when you shut the car off. I have A.C. car and I had a non-functional gizmo of this sort ..?

January 4th, 2009, 03:55 PM	#11 (permalink)
71 delta88guy Registered User Join Date: Oct 2006 Posts: 80	now that is funny.

January 4th, 2009, 04:43 PM	#12 (permalink)
J-(Chicago) Seasoned beater pilot. Join Date: Jan 2007 Location: Chicago Posts: 2,696	__________________ I'd rather have a numbers matching poker hand.

January 4th, 2009, 05:42 PM	#13 (permalink)
MN71W30 Registered User Join Date: Dec 2008 Location: oakdale, Minnesota Posts: 530	All that technical advice wasted.

January 4th, 2009, 11:41 PM	#14 (permalink)
projectheaven Registered User Join Date: Dec 2007 Location: San Francisco bay area Posts: 180	It will help the next person that problem happens to.That guys probably not even around anymore though. __________________ ____________________ 96 Impala ss 96 Buick Rivera(supercharged) 00 Yamaha R1

January 5th, 2009, 10:19 AM	#16 (permalink)
f-85 Registered User Join Date: Aug 2007 Location: Yorkville,il Posts: 279	Watch the seafoam. I like it and use it on all my old cars when i first get them. I use the sea foam bofore i change the plugs. I have seen a few times the sea foam foul out the plugs. So sea foam fist, new plugs next. Then some burn outs! LOL __________________ 1964 4DR F-85 455 1964 Olds Super 88 394 (sold to my buddy) 1958 International A-100 Project

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