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Engine performance #1337387 Thu Dec 12 2019 01:57 PM
Joined: Jan 2016
Posts: 650
D
dgrinnan Offline OP
Shop Shark
My 1954 3100 235 has not been tuned up in a while. It has always ran great. It is now cold and I started it up to warm up before I left the house. As usual, I had to have full choke until the engine slightly warmed up and then I only back off the choke a little bit. Recently I noticed it seemed to be running just a little bit rough. It was hard to hear a distinct miss fire. I later noticed the exhaust left a residue on the driveway. Very heavy carbon build up. It was much darker than the pictures really shows. Two different days. It looks lighter in the picture for some reason.

For the engine experts, does the heavy carbon exhaust tell you anything about the engine performance and what I might need to change/fix? Simple tune-up? Timing? ?????



Attached Files
Exhaust.jpg (401.11 KB, 153 downloads)
Exhaust2.jpg (344.65 KB, 149 downloads)
Last edited by dgrinnan; Thu Dec 12 2019 01:59 PM.

Dave from Northern Kentucky
My 54 3100
Re: Engine performance [Re: dgrinnan] #1337388 Thu Dec 12 2019 02:07 PM
Joined: Sep 2001
Posts: 29,288
tclederman Offline
Boltergeist
When was the last time you adjusted the carburetor (and, timing).

What techniques did you use?


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic - part of the family for 15 years
Z-series (54/55) GMC 350 (2-ton) COE - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler.
Re: Engine performance [Re: dgrinnan] #1337389 Thu Dec 12 2019 02:07 PM
Joined: Jun 2011
Posts: 3,117
E
EdPruss Offline
Shop Shark
Surprised you need that much choke, looks like I unburned fuel?

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
Re: Engine performance [Re: dgrinnan] #1337401 Thu Dec 12 2019 03:52 PM
Joined: Dec 2008
Posts: 1,360
P
panic Offline
Shop Shark
Don't warm it up, drive it.

Re: Engine performance [Re: dgrinnan] #1337404 Thu Dec 12 2019 03:59 PM
Joined: Jan 2016
Posts: 650
D
dgrinnan Offline OP
Shop Shark
I have had it for 3 years. It was running great when I got it and I have not touched the timing, plugs, points, condenser or carburetor other than to adjust the idol speed screw. I have always had to pull full choke to start it until it ran for a minute or two but it has always ran like a champ. it still does when I drive it. It was just when it was sitting there warming up this past weekend I noticed the exhaust marks on the driveway and it was running a little off. When I drove it there was not issue. It was running fine.


Dave from Northern Kentucky
My 54 3100
Re: Engine performance [Re: dgrinnan] #1337405 Thu Dec 12 2019 04:16 PM
Joined: Apr 2005
Posts: 8,128
Justhorsenround Offline
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
When they sit for an extended time condensation builds up in the exhaust system. When you start it it will blow it out as black or dark gray liquid. This happens especially if you only do short drives not allowing the engine to come to full operating temperature. Drive it like you stole it and put it away at full operating temp.šŸ› 


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
ā€˜65 Chevy Biscayne 4dr 230 I-6 one owner (Iā€™m #2)
ā€˜39 Dodge Businessmans Coupe


"I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line" and lock up those on the wrong side of that line.

Re: Engine performance [Re: dgrinnan] #1337409 Thu Dec 12 2019 04:56 PM
Joined: Jun 2004
Posts: 8,161
W
Wrenchbender Ret. Offline
Master Gabster
Sounds like you are using too much choke. The plugs are probably carboned up. You probably have diluted the oil also.
George

Last edited by Wrenchbender Ret.; Thu Dec 12 2019 04:57 PM.

They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.

1956 Chevy 1/2-Ton Pickup

Re: Engine performance [Re: dgrinnan] #1337410 Thu Dec 12 2019 05:11 PM
Joined: Mar 2014
Posts: 1,183
J
Jon G Offline
Shop Shark
If you have a Rochester carburetor and if you're using gas laced with ethanol and if you're not driving it very often, it is very likely your power piston is stuck in the "down" position. If this is the case, you'll be running much richer than you should. The ethanol when mixed with unleaded gas dries leaving a sticky gummy varnish-like residue which will stick that power piston as tight as if you epoxied it in there. And because of the spring, it will always be in the down position, opening the power valve fully. Good luck.


Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
Re: Engine performance [Re: dgrinnan] #1337418 Thu Dec 12 2019 06:39 PM
Joined: Jan 2016
Posts: 650
D
dgrinnan Offline OP
Shop Shark
I will have to look under the hood to confirm what my carburetor is. Any chance running fuel cleaner through a tank of gas or spraying carb cleaner will clean out the carburetor? If not is my next/only option to rebuild the carburetor assuming the power piston is sticking.


Dave from Northern Kentucky
My 54 3100
Re: Engine performance [Re: dgrinnan] #1337422 Thu Dec 12 2019 06:58 PM
Joined: Feb 2004
Posts: 19,671
H
Hotrod Lincoln Online
Boltergeist
There's virtually no way to do a "carburetor rebuild in a can" successfully. I agree with the idea that you've got a stuck power piston, but once the engine fires the first time and runs for a minute or so, there shouldn't be a need for much, if any choke. It sounds like it's time to dismantle and thoroughly clean the carburetor, rebuild it, and then DRIVE it more often. Short trips and "warm-up" runs are death on carburetors. Make 'em earn their keep with some highway-speed trips frequently.
Jerry


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The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
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