[66dream]

I ordered the ballast resistor, so I’ll let y’all know when I get it on (should be here the 28th).
I tried turning on the lights high beam and brake lights and that helped one time but next time I tried it I got just a little run on , not as much soooo idk

 

[71malibuu]

Assuming the msd is wired properly I’d say your Moving in the right direction.
Let us know how it turns out.

 

[NorthPlainsDrifter]

It does sound like you are heading tin the right direction. After I installed the Holley Sniper and Hyperspark, it wouldn't turn off with the key although it was wierd correctly. For some reason after the install my alternator was back feeding 6 volts through the system, just enough to keep running. The fix was to put in a diode at the alternator. Good luck, hopefully that will do it.

 

[bigchevyftw_4525]

Hey guys, I have zz383 , 750 DP, Mallory unilite, MSD 6A
Initial timing 19BTC
Idle ~950 RPM

The car runs good at 950 RPM with the manual transmission, but always runs on or diesels (I guess you would call it) after I turn the key off. I’ve even tried backing off the timing retarding it about 2°. But it doesn’t help I can set the idle back down to about 600 RPM , then it shuts off with the key like it should, but I don’t get the throttle response off idle and the clutch doesn’t act as good as when the idle is set at 950 RPM, and it smells better with the higher idle speed.
My question is - how do I keep my car from running on after I turn it off with my idle at 950 RPM. (Very annoying and embarrassing)
TIA

Push the brakes and let's the clutch out fast it won't keep idling! the carb is too big for a 383 a 650or a 680 cfm is perfect for 383ci it would be better for awesome throttle response unless you have a camshaft with a very tight lobe separation angle and 4 Degrees advanced ground into it with 6 inches of vacuum and a 2.5 power valve with manual brakes!

Point is the carb is the problem as said before everything else I went thru trial by fire!

 

[mrpaticular]

Many suggestions here that are not fixes, bandaids !!

 

[bigchevyftw_4525]

Please don't forget the inline fuses!

 

[OldtimeSSer.]

Hey guys, I have zz383 , 750 DP, Mallory unilite, MSD 6A
Initial timing 19BTC
Idle ~950 RPM

The car runs good at 950 RPM with the manual transmission, but always runs on or diesels (I guess you would call it) after I turn the key off. I’ve even tried backing off the timing retarding it about 2°. But it doesn’t help I can set the idle back down to about 600 RPM , then it shuts off with the key like it should, but I don’t get the throttle response off idle and the clutch doesn’t act as good as when the idle is set at 950 RPM, and it smells better with the higher idle speed.
My question is - how do I keep my car from running on after I turn it off with my idle at 950 RPM. (Very annoying and embarrassing)
TIA

Hi 66dream. I have a couple of questions for you if you don’t mind. Have you ever owned a 70 Chevelle? I was researching mine the other day. I posted the Rear axle number on Google. CCF1212B1. What came up was a post by you asking the same question with the exact same numbers!!I going to say it was back in 2005? I would love to find a previous owner to either varify or debunk some if the history of my car. Thanks so much for your time.

 

[richiecat4223]

Hi 66dream. I have a couple of questions for you if you don’t mind. Have you ever owned a 70 Chevelle? I was researching mine the other day. I posted the Rear axle number on Google. CCF1212B1. What came up was a post by you asking the same question with the exact same numbers!!I going to say it was back in 2005? I would love to find a previous owner to either varify or debunk some if the history of my car. Thanks so much for your time.

The first 3 letters is all you need. Yours was for a 3:31 12 bolt posi (L34/402 & L48/350-4)
The numbers are month built and assembly plant.

1970 Chevelle Rear Axle Codes

Decoding Chevrolet VIN, trim tags, cowl tags, engine, engine block casting numbers, cylinder head casting numbers, intake manifold casting numbers, transmission, interior codes, and paint codes.

chevellestuff.net

 

[OldtimeSSer.]

Ya, I didn’t have an issue decoding, I was more interested in talking with 66dream to see if he may have owned this car previously. But what I am taking away is that there could be the same axle numbers. Built 12/12 Buffalo plant 1 st shift . Seems a bit far fetched to see another with exactly same numbers. I’m sure they made more than 1 a day so it’s certainly possible.

 

[overdriv]

Run on caused by alternator voltage keeping the MSD box on, is a totally different problem from dieselling caused by carb/timing/fuel problems.

 

[richiecat4223]

Ya, I didn’t have an issue decoding, I was more interested in talking with 66dream to see if he may have owned this car previously. But what I am taking away is that there could be the same axle numbers. Built 12/12 Buffalo plant 1 st shift . Seems a bit far fetched to see another with exactly same numbers. I’m sure they made more than 1 a day so it’s certainly possible.

Can you backtrack the vin thru motor vehicle for it's history?

 

[mrpaticular]

Can you backtrack the vin thru motor vehicle for it's history?

Not usually going to happen since 9-11.

 

[richiecat4223]

Not usually going to happen since 9-11.

What are you saying?
Because the towers fell all car records were destroyed also?

 

[magicrat56]

What are you saying?
Because the towers fell all car records were destroyed also?

Since 9/11 you can't "run" a plate or Vin# unless it's in connection with a crime.

 

[richiecat4223]

Since 9/11 you can't "run" a plate or Vin# unless it's in connection with a crime.

Didn't know that. Thanks

 

[66dream]

Did you verify that it's feeding back? I still say lower the idle.

Did you verify that it's feeding back? I still say lower the idle.

How do you verify if your getter feedback?

 

[mrpaticular]

Didn't know that. Thanks

That is why you see all these people on here or other sites asking for help locating a car from the past and even stolen vehicles.
No more private title searches.
Rick

 

[magicrat56]

How do you verify if your getter feedback?

with the engine idling just before you shut it off turn on the head lights and see if it shuts off clean. that would indicate if the load on the system will let it shut down clean. if it still runs on then you need to work on the carb to idle at 750-800 rpm

 

[66dream]

So I installed the ballast resistor. Did not help.
I really like the drivability of the car at 900 RPM.

maybe I will try the idle solenoid next.

 

[donnie o]

Hey guys, I have zz383 , 750 DP, Mallory unilite, MSD 6A
Initial timing 19BTC
Idle ~950 RPM

The car runs good at 950 RPM with the manual transmission, but always runs on or diesels (I guess you would call it) after I turn the key off. I’ve even tried backing off the timing retarding it about 2°. But it doesn’t help I can set the idle back down to about 600 RPM , then it shuts off with the key like it should, but I don’t get the throttle response off idle and the clutch doesn’t act as good as when the idle is set at 950 RPM, and it smells better with the higher idle speed.
My question is - how do I keep my car from running on after I turn it off with my idle at 950 RPM. (Very annoying and embarrassing)
TIA

Put one of those electric idle solenoids on it like they used in the 70's to bump the idle up when you turned the AC on. Then you can just flip a switch to lower the idle speed before shut down.