73 2.0 running *really* rich |
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73 2.0 running *really* rich |
rpc |
Jul 7 2017, 03:14 PM
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#1
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Member Group: Members Posts: 50 Joined: 18-May 11 From: Reston, VA Member No.: 13,084 Region Association: MidAtlantic Region |
History: We bought this '73 2.0 last summer. It ran ok at the time, though on cold start-up it would choke if we gave it throttle before it had a chance to warm up for a few minutes. We dropped the drivetrain in the fall to do a bunch of general cleanup on the engine and trans, including:
Today: We finally got everything back together and started the car but it was running really rich, so much so that we could barely keep it running. After we shut it off it wouldn't start again. It would spin fine, but not even a hint of firing. Things we've done:
So first, I think it's so badly flooded that we need to wait a day and/or pull the plugs so that the cylinders dry out. Second, I'm guessing that replacing the hoses fixed a bunch of air leaks, which some PO had compensated for by richening the mixture. I could very well be wrong, just a guess. I've read a good amount and have a basic understanding of the D-jet system, but I'm looking for pointers about where I should start in fixing this. If I'm right about the flooding we should be able to get it started. Then what do we need to start checking to address the rich running? |
rpc |
Jul 11 2017, 04:10 PM
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#2
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Member Group: Members Posts: 50 Joined: 18-May 11 From: Reston, VA Member No.: 13,084 Region Association: MidAtlantic Region |
Today's update:
Turns out the MPS leak isn't as bad as I thought. It leaks, but slow enough so that it can function. The real culprit turned out to be the CSV. I pulled it out and as soon as I turned the key on there was a gush of fuel. I clamped the fuel line to the CSV and the car ran fine. New replacements are a little (!) pricey. Can these be rebuilt? From what I've read the CSV is only operational at or below the setpoint of the thermo switch, which is O(32F). So it's not critical for me (and, I suspect, not for most owners). Also checked the CHT sensor again, which read 1534 ohms at 73F ambient. Set the dwell to 49 degrees, and timing was spot on at 27 degrees BTDC at 3500rpms. The fuel pressure might have been a tad off, but it's now right at 2 bar/29 psi. Thanks a lot to Rob (BeatNavy) who went above and beyond to lend me his spare MPS for testing. And thanks to everyone who offered advice -- it was spot on. IMG_4173.MOV ( 1.67mb ) Number of downloads: 46 |
BeatNavy |
Jul 11 2017, 04:28 PM
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#3
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Certified Professional Scapegoat Group: Members Posts: 2,924 Joined: 26-February 14 From: Easton, MD Member No.: 17,042 Region Association: MidAtlantic Region |
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So the CSV was the guilty party on this one. Good info. Can these be rebuilt? From what I've read the CSV is only operational at or below the setpoint of the thermo switch, which is O(32F). So it's not critical for me (and, I suspect, not for most owners). Correct - these aren't super critical. You can run fine without it while keeping an eye out for a serviceable one that's reasonably priced. Not sure if they can be rebuilt or not. |
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