Golden Jubilee
Posts: 741
Joined: Sat Jun 29, 2013 12:58 am
Location: Central IL
Re: '55 R-122 rehab
I essentially installed the entire system today aside from the wiring that was already laying in place. After the missing wiring was added I snugged up the fuel fittings and put about 6gal of gas in the new tank. I ran the fuel pump for a few min to purge any air from the system and check for leaks- all was well. My system has the GM oil pressure sensor installed. I cranked the motor so long while trying to check/adjust the base timing (with the fuel pump fuse removed) that the engine built enough oil pressure to run the fuel pump... Imagine my surprise when it started to cough and stumble to life.
After I felt the base timing was close I warmed the engine and re-adjusted it. The idle was all over the place and mostly slow rolling but hunting none the less. I went for the IAC adjustment. Even after stroking and disconnecting the IAC the TBI unit was drawing air past the IAC. I removed the IAC, cleaned the pintle and seat. Not knowing what would happen I cycled the IAC while it was removed from the the TB. The pintle and spring shot out of the unit. I managed to find them and reinstall them. The unit actually seems to work better now. Between the cleaning and fiddling with the throttle stop I was able to get a reading around 40-45 for the IAC (sometimes...). While I did seem to get the IAC to respond properly I am tempted to replace it since the pintle popped out and they really aren't that expensive. The motor hesitates off idle unless you're very smooth with the butterfly rotation. Quick snaps make the engine almost die before it figures out what's going on. I have more research/testing/adjusting to do as soon as I can get back to the garage. I saw the TPS was reading .72v when I had to stop working for the day. The idle seemed to smooth out some as well as the afternoon wore on.
I am disappointed in the throttle cable assembly that I created. The cable itself is binding off idle. It's impossible to feather the throttle. You're applying a pile of force to the pedal then all the sudden the cable gives way and you bury the pedal... Not gonna fly on the streets so I didn't even consider goin g for a drive today. Tomorrow (If my wife is put on call) I will rework the design to get that smoothed out.
All in all I'm pleased that the truck runs on EFI. Now to get the kinks hammered out so it can be useful again. It's gotta be driveable on Sat. morning...With possibly only 2 half days on Thurs/Fri to work on it I really hope that I don't have to swap back in the carb/dist/etc. Looking forward to getting some seat time later this week for data logging.
'64 Porsche 356 C
'68 and '73 BMW 2002s
‘14 VW Passat SE TSI
3 Vintage Sears garden tractors ('66-'74)