85 Caprice Still Runs (Stumbles) when shut off - Chevy Impala Forums

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Chevy Caprice General and Technical discussion for the Chevy Caprice (1965-1996), which shares the B-Body platform with the Chevy Impala.

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Old 02-24-2012, 11:23 PM   #1 (permalink)
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85 Caprice Still Runs (Stumbles) when shut off

Hello- just a quick question. After searching the only answer I could find was that the carb needs to be lubed up. Is that the answer to my problem?


Maybe once a week when I go to turn off Carl, I can have the keys fully in my hand and he'll still be running- stumbling like he wants to cut off but keeps on going for maybe 5 seconds. The car bucks a bit and its embarrassing to say the least. Whats this issue? Thanks all.

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Old 02-25-2012, 01:07 AM   #2 (permalink)
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Sounds to me like you should check your timing.

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1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
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95 9C1 3.08 posi
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16x8 American Racing Baja's with 225/60/16 Pirelli P4's

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Old 02-25-2012, 05:52 AM   #3 (permalink)
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You may also due to the timing being off have some carbon buildup in the cylinders. You can try a Seafoam treatment to help clean that out.

Also make sure the engine idle is not set to high.

A trick you can do for now until you get this fixed is to turn the car off while it is still in gear then put it in park after it dies. I had to do this to mine for a while. This trick works well.

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Old 02-25-2012, 08:00 AM   #4 (permalink)
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Dang that sounds expensive, thanks guys :) I've rebuilt an engine before, but the timing is one thing I don't really mess with. I guess I'll have to take it in for someone to look at it.

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Old 02-25-2012, 07:16 PM   #5 (permalink)
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Expensive? No, get a distributor wrench and timing light, less than $50 for both if you go to harbor freight or something like that. Hook the timing light up, alligator clips on the battery terminals, clamp on the #1 plug wire(driver front), unplug the electronic advance pigtail, should be along the passenger valve cover for your year. Start the engine, and point the light down behind the water pump, you will see a mark on the balancer, and a set of marks on a metal tab coming off the timing cover. You should have a sticker in the engine compartment telling you the spec, I think its 4-6 degrees advance. If its off, turn it off, loosen the distributor hold down bolt located at the base of the distributor on the passenger side, you will need to remove the air cleaner to get to it. Start the engine again, and watch the mark with the timing light as you turn the distributor, you will see the mark move. Set it to spec, and you should be ok.

For the seafoam, just get a can of it from the auto parts store, not the aerosol kind. There should be directions for using with carbed vehicles, with the engine running you pour about half the can down the primary throat of the carb slowly while holding the throttle slightly open, then let go of the throttle and dump the rest in. It will stall the engine, turn the key off and let it sit a couple hours (directions will say like 15 minutes, but longer is better), fire it back up, and it will smoke like you wouldn't believe. Run the piss out of it, then you should be good to go.

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1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
4 wheel disc brakes!
16x8 American Racing Baja's with 225/60/16 Pirelli P4's

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Old 02-26-2012, 12:47 AM   #6 (permalink)
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Thanks Nut, I appreciate the quick run down. I'll be sure to check it out when time permits

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Old 03-12-2012, 03:46 PM   #7 (permalink)
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There's a new issue with Carl that I'm unsure if its part of the stumbling. I haven't been able to take him in to get the timing looked at yet, but when I first start him up- and I just take off and drive, normally he's good. But lately he just dies when I try to take off from a light or a stop. Only once in the morning though. After I restart him he's good to go. Any clue? I'd like to get all my ducks in order before I take him in. Thanks guys.

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Old 03-12-2012, 04:36 PM   #8 (permalink)
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Sounds like a Choak problem to me ??

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1983 Caprice Classic. 350 CID. 330 HP. 380 Ft.Lbs. Torque.
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Old 03-13-2012, 08:40 AM   #9 (permalink)
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If the timing hasn't been done yet, I wouldn't look at anything else. Frankly I'm surprised you weren't having that issue before.

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1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
4 wheel disc brakes!
16x8 American Racing Baja's with 225/60/16 Pirelli P4's

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Old 04-16-2012, 05:23 PM   #10 (permalink)
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Quick question... I'm thinking about swapping in an LS2 and tranny from a TBSS. How will I know if these things will fit or not?

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Old 04-17-2012, 08:54 AM   #11 (permalink)
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It will not be a direct fit, there are write-ups somewhere on it. From what I understand, you will need to notch the crossmember, and get motor mount adaptors at the very least. Then you may also need to have the driveshaft shortened. It would be a lot less work to get an LT1/4L60E in there, but the LS is a better package.

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1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
4 wheel disc brakes!
16x8 American Racing Baja's with 225/60/16 Pirelli P4's

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Old 08-05-2012, 10:05 AM   #12 (permalink)
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I ended up putting premium fuel in Carl and he's been fine ever since. Is there a detailed write up about messing with our carb's? How to adjust them, etc?

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Old 08-05-2012, 10:47 AM   #13 (permalink)
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yep, had that same issue with the cuda. I put higher octane fuel (midgrade) and it no longer does it.

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Quote:
Originally Posted by cali boi View Post
With the stangs they rememind me of the civics.... everybody frm that freshman girl in high schoo to that old man who has three of them has a damn stang..... ill even say the stang is the american honda civic...

so I don't lose this again Dwayne's stuff done to his car and recommendations: http://www.impalaforums.com/269706-post6.html
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Old 08-06-2012, 10:01 AM   #14 (permalink)
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Still sounds like a timing issue...

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1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
4 wheel disc brakes!
16x8 American Racing Baja's with 225/60/16 Pirelli P4's

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Old 08-28-2012, 08:05 AM   #15 (permalink)
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Well I finally ended up taking it to a mechanic. He was a bit shady- trying to charge me 40 dollars to tighten up my fuel fitting (slight leak). But he reset my timing and lowered my RPM's to the "book" standard. Cost me 65 bucks. He said it was advanced 13 degrees. Told me if I heard it "pinging" while climbing up a hill or something to bring it back for adjustments. I thought this might fix the dieseling issue but it didn't. Came back a day later if just for a moment or two. When cold starting Carl he sometimes takes a good 7-10 seconds before he fires up. Is that normal? A coworker said it wasn't and suggested a timing issue which is why I eventually bit the bullet to try and figure it out. When I put in premium the dieseling issue is gone completely. Not a big deal to go premium, just wondering if its a sign something else is an issue. I've never changed the plugs or wires yet either.

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