Lost much of my power, shuttering and shaking - K20, SBC 350

[1980K20]

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[VileZambonie]

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 If I read this right, you have a driveability issue going on that originally made you think you had a transmission issue.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.

[1980K20]

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

[1980K20]

Well the saga continues. The pressure regulator came in early.  Same reading around 85.  So I thought I’d check the return line, it read 25!  25+59.5=84.5.  Hmmm, coincidence?

We’ll gee whiz.  I’m done with hope, this is indeed a goose chase.  Tomorrow is time for air hose to see if there’s something up with the lines, or just run the return to a gas can.





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[1980K20]

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 haven’t tested the intake pressure yet.

Test drive it, runs basically the same. Feels like it’s 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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[Geezer77GMC]

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.

[1980K20]

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 can’t delete and start over.

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

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

One jet on the passenger side isn’t doing anything.  I’ve 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 that’s 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.

I’ll get a new injector, put on a new fuel filter just in case there’s some debris in there that got through.

Here’s a picture with the side cover off the efi



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[JohnnyPopper]

Well I gotta say man, she is super clean. Hope you find out what ails her...

[1980K20]

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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[1980K20]

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 didn’t spit gas

If the injector weren’t 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 can’t 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, I’ll get to 36 soon.

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

Thanks for your help!




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[Shifty]

[Mike81K10]

Nice to see you have the problems fixed! Congrats!

[1980K20]

Thanks Shifty and Mike!


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[JohnnyPopper]

I'm sure you can spin them right after a car wash, 

I do it all the time to get my fix 

This has been a long thread/journey, Thanks for keeping us in the loop!!