Author Topic: Lost much of my power, shuttering and shaking - K20, SBC 350  (Read 2777 times)

Offline 1980K20

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Re: Too much fuel goose chase
« Reply #15 on: September 19, 2022, 08:54:05 AM »




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1952 International L112 - waiting for EV conversion
1967 Camaro - 250 six cyl, 200-4R
1980 K20 4x4 Fleetside - 350 SBC roller Cam, TH350

Offline VileZambonie

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Re: Too much fuel goose chase
« Reply #16 on: September 19, 2022, 05:38:31 PM »
Your edited post makes this thread a mess. You originally posted about your transmission, edited the post to "too much fuel goose chase" and have nothing listed in pinpoint steps to be helped or to help others that might have an issue that you are having. If I read this right, you have a driveability issue going on that originally made you think you had a transmission issue.  You mention "carb connection" but you have EFI? Why don't you start over, provide your specs, and what you have going on? What fuel and ignition setup do you have? What issue are you currently having? Describe the symptoms.
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Offline 1980K20

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Re: Lost much of my power, shuttering and shaking - K20, SBC 350
« Reply #17 on: September 19, 2022, 08:41:38 PM »
Good suggestion.  If I could, I'd just delete the entire thread and start over.

I rewrote the intro thread with the symptoms, experiments, and progression of the debug.  Of course, changed subject again.

Mark
« Last Edit: September 19, 2022, 10:27:32 PM by 1980K20 »
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1952 International L112 - waiting for EV conversion
1967 Camaro - 250 six cyl, 200-4R
1980 K20 4x4 Fleetside - 350 SBC roller Cam, TH350

Offline 1980K20

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Lost much of my power, shuttering and shaking - K20, SBC 350
« Reply #18 on: September 23, 2022, 12:15:34 AM »
Well the saga continues. The pressure regulator came in early.  Same reading around 85.  So I thought Iíd check the return line, it read 25!  25+59.5=84.5.  Hmmm, coincidence?

Weíll gee whiz.  Iím done with hope, this is indeed a goose chase.  Tomorrow is time for air hose to see if thereís something up with the lines, or just run the return to a gas can.





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1952 International L112 - waiting for EV conversion
1967 Camaro - 250 six cyl, 200-4R
1980 K20 4x4 Fleetside - 350 SBC roller Cam, TH350

Offline 1980K20

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Lost much of my power, shuttering and shaking - K20, SBC 350
« Reply #19 on: September 24, 2022, 07:05:37 PM »
Discovered my return line was kinked in one place. I think the long hot drive softened it and it failed in the loop to allow for installation. Unkinked it and pressure dropped to 2. Dropped the gas tank, created custom stainless bend to prevent the kink. Now pressure is zero, I havenít tested the intake pressure yet.

Test drive it, runs basically the same. Feels like itís continually missing.  Many times that is electrical, but now who knows?

At least I fixed something today.

Pictures of the kink and the tube I used to make a circular bend.





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« Last Edit: September 24, 2022, 07:40:40 PM by 1980K20 »
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1952 International L112 - waiting for EV conversion
1967 Camaro - 250 six cyl, 200-4R
1980 K20 4x4 Fleetside - 350 SBC roller Cam, TH350

Offline Geezer77GMC

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Re: Lost much of my power, shuttering and shaking - K20, SBC 350
« Reply #20 on: September 25, 2022, 09:48:07 AM »
Wondering what your reasoning is on the stop sign shaped loop. Can't you just use a proper length hose? Maybe the fuel is getting dizzy being sent in circles like that, I got a bit dizzy trying to follow thread to getting here at the fuel return from the damaged transmission concerns.

Offline 1980K20

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Re: Lost much of my power, shuttering and shaking - K20, SBC 350
« Reply #21 on: September 25, 2022, 10:05:50 PM »
Hi Geezer,

I thought I had a nice long loop that would have been fine, but it obviously kinked.

Sorry about the meandering thread. You canít delete and start over.

I checked the pressure on the intake this afternoon, it said 65.  Should be lower but maybe itís my gauge.

Found the big issue at last, I think. At least I know itís a problem. Learning curve on efi is huge.

One jet on the passenger side isnít doing anything.  Iíve got a dual plane intake, drivers side gets double the fuel, which speaks to many issues.

Pulled the passenger side injectors off. Both electrical fittings looked tight but rear passenger clip broke off easily. Apparently thatís a thing with Holley efi
. Bench tested 12v into the injectors, heard them click.  Swapped rear to front, used zip ties to hold both connectors in place, front injector gives nothing. Something with the injector, not electrical.

Iíll get a new injector, put on a new fuel filter just in case thereís some debris in there that got through.

Hereís a picture with the side cover off the efi



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1952 International L112 - waiting for EV conversion
1967 Camaro - 250 six cyl, 200-4R
1980 K20 4x4 Fleetside - 350 SBC roller Cam, TH350

Offline JohnnyPopper

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Re: Lost much of my power, shuttering and shaking - K20, SBC 350
« Reply #22 on: September 27, 2022, 11:38:14 PM »
Well I gotta say man, she is super clean. Hope you find out what ails her... :'(
1957 Apache 3100 235 Inline 6, 3 on the tree
1973 C-20, 3+3 454 4BBL TH400  Water Injection
1978 K-10, 350 4BBL TH350 NP203 M.M. Part time Kit/Hubs
1980 C-10 under construction

Offline 1980K20

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Re: Lost much of my power, shuttering and shaking - K20, SBC 350
« Reply #23 on: September 29, 2022, 08:43:29 AM »
Well I gotta say man, she is super clean. Hope you find out what ails her... :'(
Thanks Johnny!

Will update on Sunday, new injector comes in Saturday.


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1952 International L112 - waiting for EV conversion
1967 Camaro - 250 six cyl, 200-4R
1980 K20 4x4 Fleetside - 350 SBC roller Cam, TH350

Offline 1980K20

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Re: Lost much of my power, shuttering and shaking - K20, SBC 350
« Reply #24 on: October 08, 2022, 09:45:05 PM »
Alright, the injector was the final problem.  Fixed along the way actual problems (replaced a few other things also but not real problems)

1) Bad exhaust collector gasket in front of o2 sensor.  Every seam on the exhaust leaks a little!
2) pinched return hose, probably a foot too short
3) accelerator extender and reset kick down
4) gas filter was 30 micron, not 20.
5) injector clicked but didnít spit gas

If the injector werenít bad, I may not have found the other issues.

Plug #7 was previously super fouled. I took out #7 after the repairs, it cleaned up nice.  Bottom was before, top is after fix.  I had put in fresh plugs



Got the sniper efi tuned up. Have to work on cold start but it runs well now!  Still canít spin tires, thought that should be easy, apparently not.  This is in a wheel Dyno, at the crankshaft is something like 25% more.  Timing is still 34, Iíll get to 36 soon.

Max Hp 233 (168 with bad injector)
Max torque 260 lbs-ft

Thanks for your help!




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1952 International L112 - waiting for EV conversion
1967 Camaro - 250 six cyl, 200-4R
1980 K20 4x4 Fleetside - 350 SBC roller Cam, TH350

Offline Shifty

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Re: Lost much of my power, shuttering and shaking - K20, SBC 350
« Reply #25 on: October 10, 2022, 09:04:43 AM »
:D
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Offline Mike81K10

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Re: Lost much of my power, shuttering and shaking - K20, SBC 350
« Reply #26 on: October 10, 2022, 08:50:33 PM »
Nice to see you have the problems fixed! Congrats!
"Tell me and I forget. Teach me and I remember. Involve me and I learn." -Benjamin Franklin

Offline 1980K20

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Re: Lost much of my power, shuttering and shaking - K20, SBC 350
« Reply #27 on: October 12, 2022, 08:21:26 AM »
Thanks Shifty and Mike!


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1952 International L112 - waiting for EV conversion
1967 Camaro - 250 six cyl, 200-4R
1980 K20 4x4 Fleetside - 350 SBC roller Cam, TH350

Offline JohnnyPopper

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Re: Lost much of my power, shuttering and shaking - K20, SBC 350
« Reply #28 on: October 12, 2022, 07:52:25 PM »
I'm sure you can spin them right after a car wash,  ;)

I do it all the time to get my fix  8)

This has been a long thread/journey, Thanks for keeping us in the loop!!
1957 Apache 3100 235 Inline 6, 3 on the tree
1973 C-20, 3+3 454 4BBL TH400  Water Injection
1978 K-10, 350 4BBL TH350 NP203 M.M. Part time Kit/Hubs
1980 C-10 under construction