CK5
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The Shop Truck

1971 Chevy C20 with a custom flat bed.
It's installed!
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We changed quite a bit while we had the transmission out. I had been having an issue where the drivers bank was always running about 1 number leaner than the passenger side, along with #6 going cold at WOT. We took our injectors and got them cleaned and tested, then I remade the supply lines for the fuel rails. Previously they came in from the passenger side and the drivers side rail had a longer line as well as an extra bend. We made a new line that goes to the middle of the truck and splits off to both rails with identical lines, unfortunately it was in the way of the transmission :doah:.
We redid the lines today, but I was short one olive ferrule for one fitting, so no starting it today. We also still need to get the sensor block mounted and run the line from the transmission to it so we don't blow fluid everywhere. The new fittings should be here before we get up tomorrow, so we're hoping to have it running tomorrow morning at some point.
 
We mounted the Rife sensor block on the firewall behind the blower, it seemed like the best place for it. I've only got the trans line pressure hooked up so far, but eventually it will take over MAP, oil pressure and fuel pressure duties as well.
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We wired up the sensor block other than the MAP wire since that is a dedicated circuit on the Dominator. We also wired the trans brake up to our relay box in the cab of the truck.
It's been rainy all day, but cleared up for a few so we decided to take the truck for a quick drive see if it shifted through all the gears. I backed out my back driveway into the alley and the truck wouldn't go forward :eek:. I shifted back to park, reverse and drive again and this time I felt it start to move then stop, then I started laughing as the rain started.
Amber ran and grabbed my laptop so I could reprogram the output for the relay we hooked up to, it had previously been used for something that got activated any time the engine was running, so the trans brake was activated. I disabled the output and pulled the truck back into the garage with no further issues and then we had a good laugh.
On the bright side, now I know the trans brake works!
 
I forgot to mention that we were actually registered for the Kingman Route 66 drags Friday and Saturday. It turns out it doesn't matter that we couldn't go, it got rained out anyways.
They got a lot of racing in, and had even gotten a few finials before the sky let lose @7pm on Saturday. Wife and I where there for the weekend.
 
I think Saturday I’ll be at the track
They're actually letting racers show up on Thursday to get set up and get through tech. We're taking the RV and staying at the track since the weather is going to be nice. They are going to have an RV section on the left side of the big end of the track and we're hoping to get set up there, otherwise we'll be over by the "lake" which stinks (literally).
 
I drove the truck over to Outlaw Race Engines to pick up my nitrous bottles. It drove and shifted great, by the time I was close to home I was at about 130-140 miles on the transmission so I did a WOT 1-3 test hit (big low boost pully).
The transmission shifted great, the datalogs look great, but #6 cylinder is going 100-200°F cooler than the other cylinders. So far I have taken the injectors to get cleaned, swapped injectors around on the engine, swapped #6 coil, spark plug, and spark plug wire. The issue only shows up at WOT and I can't figure out WTF is going on. I also still have the issue where the left bank is leaner than the right bank by about 1 number on the gasoline (14.7) O2 sensor scale. On that I redid the fuel supply lines so they are identical side to side and I've swapped the O2 sensors (went from Bosch to NTK). The spark plugs look the part as the left bank have less soot on them than the right bank. Also if I average the left bank EGTs and the right bank EGTs, the right bank is 20-30° cooler.
 
Is there anyway to tell if the injector on 6 is failing at that high of duty cycle?
Would that have shown up during cleaning?

I guess when you pulled em out for cleaning, they didn't go back in the same holes... So that probably wouldn't be it... :doah: :thinking::waytogo:
 
Is there anyway to tell if the injector on 6 is failing at that high of duty cycle?
Would that have shown up during cleaning?

I guess when you pulled em out for cleaning, they didn't go back in the same holes... So that probably wouldn't be it... :doah: :thinking::waytogo:
The first test I did was to swap injectors from left to right bank, nothing changed. Also I had them cleaned and tested, they were within 2% of each other at 100% duty cycle. I wish they would have tested at 85%, but they only tested at 15% and 100%. They numbered the injectors 1-8 and that's how I reinstalled them, the suspect (#6) injector was labeled #1 so it's on cyl 1 now.
 
Look at the plugs to see if they correlate to the O2 offset. It may be real, it may be false.
 
Look at the plugs to see if they correlate to the O2 offset. It may be real, it may be false.
When I looked at the plugs during Michigan Miles, based on the color of the porcaline in order of darkness darkest to lightest 8,6,4,2,7,5,3,1.
The fuel comes into the rails at the back, the regulator is mounted to the front of the right rail and a hose goes from the left rail to the regulator. If anything I would think this would make the left rail have higher pressure, but it seems like the opposite.
 
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