lean cyLinder
- MinamiKotaro
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lean cyLinder
#2 cylinder is very lean. The header pipe is solid white, other three are black. Most likely culprit? My injectors are F.A.S.T., almost new, and supposedly flow matched.
'67 Beetle, 2276
MS-1 v3.57
MS-1 v3.57
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Re: lean cyLinder
Can you swap injectors around at all to see if it's the same scenario ? Can you pop them out and crank them into 4 jars and check the flow ?
'65 Bus with a JDM Subaru EJ20 Turbo
Built by Germans powered by Japanese and brought together by Canadians
Built by Germans powered by Japanese and brought together by Canadians
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Re: lean cyLinder
I had lean 2 and 4 because off header design..... solved by adding 6% extra to injectors in 2 and 4
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- MinamiKotaro
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Re: lean cyLinder
I can but it's a pain in the butt. Lol. Guess I'll just knuckle down and do it.
'67 Beetle, 2276
MS-1 v3.57
MS-1 v3.57
- MinamiKotaro
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Re: lean cyLinder
Hmm. I believe that pipe had been leaking at the slip joint.mads b (dk) wrote: ↑Thu Mar 02, 2017 8:03 am I had lean 2 and 4 because off header design..... solved by adding 6% extra to injectors in 2 and 4
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'67 Beetle, 2276
MS-1 v3.57
MS-1 v3.57
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Re: lean cyLinder
There are no slip joint... it's a homemade header....
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- MinamiKotaro
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Re: lean cyLinder
I meant on mine.mads b (dk) wrote: ↑Thu Mar 02, 2017 10:35 am There are no slip joint... it's a homemade header....
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'67 Beetle, 2276
MS-1 v3.57
MS-1 v3.57
- Piledriver
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Re: lean cyLinder
Batch or sequential?
Addendum to Newtons first law:
zero vehicles on jackstands, square gets a fresh 090 and 1911, cabby gets a blower.
EZ3.6 Vanagon after that.(mounted, needs everything finished) then Creamsicle.
zero vehicles on jackstands, square gets a fresh 090 and 1911, cabby gets a blower.
EZ3.6 Vanagon after that.(mounted, needs everything finished) then Creamsicle.
- MinamiKotaro
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- Joined: Sat Aug 06, 2005 6:26 am
- Piledriver
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Re: lean cyLinder
IIRC you can still use fuel trim if set for semi-sequential, but it effects 2 holes.
Semi-sequential doesn't need the extra sensor or a cam speed wheel, it just provides guaranteed injection timing, and should be IMHO default. Regular batch squirts when it gets to it.
Just enabling it and playing with the injection timing might have some positive effect by itself.
Semi-sequential doesn't need the extra sensor or a cam speed wheel, it just provides guaranteed injection timing, and should be IMHO default. Regular batch squirts when it gets to it.
Just enabling it and playing with the injection timing might have some positive effect by itself.
Addendum to Newtons first law:
zero vehicles on jackstands, square gets a fresh 090 and 1911, cabby gets a blower.
EZ3.6 Vanagon after that.(mounted, needs everything finished) then Creamsicle.
zero vehicles on jackstands, square gets a fresh 090 and 1911, cabby gets a blower.
EZ3.6 Vanagon after that.(mounted, needs everything finished) then Creamsicle.
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Re: RE: Re: lean cyLinder
On vems you can trim fuel on every cylinder if its connected to its own driver, you don't have to run fully sequentialPiledriver wrote:IIRC you can still use fuel trim if set for semi-sequential, but it effects 2 holes.
Semi-sequential doesn't need the extra sensor or a cam speed wheel, it just provides guaranteed injection timing, and should be IMHO default. Regular batch squirts when it gets to it.
Just enabling it and playing with the injection timing might have some positive effect by itself.
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- MinamiKotaro
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- Joined: Sat Aug 06, 2005 6:26 am
Re: lean cyLinder
I'd have to upgrade to MS2, wouldn't I?Piledriver wrote: ↑Thu Mar 02, 2017 6:52 pm IIRC you can still use fuel trim if set for semi-sequential, but it effects 2 holes.
Semi-sequential doesn't need the extra sensor or a cam speed wheel, it just provides guaranteed injection timing, and should be IMHO default. Regular batch squirts when it gets to it.
Just enabling it and playing with the injection timing might have some positive effect by itself.
'67 Beetle, 2276
MS-1 v3.57
MS-1 v3.57
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Re: lean cyLinder
My bad, I forget MS1 still works.
You are stuck with fixing the root cause, which is actually probably better anyway.
Addendum to Newtons first law:
zero vehicles on jackstands, square gets a fresh 090 and 1911, cabby gets a blower.
EZ3.6 Vanagon after that.(mounted, needs everything finished) then Creamsicle.
zero vehicles on jackstands, square gets a fresh 090 and 1911, cabby gets a blower.
EZ3.6 Vanagon after that.(mounted, needs everything finished) then Creamsicle.
- MinamiKotaro
- Posts: 2071
- Joined: Sat Aug 06, 2005 6:26 am
Re: lean cyLinder
Ok, I took #2 plug out and it was covered with white ash. I swapped #2 and #4 injector. We'll see if the lean condition migrates with it.
Also, two of my injectors measured 12.9 ohms resistance, the other two measured 13.5 ohm. Any cause for concern? Should I make sure to pair the two 12.9s and the two 13.5s on the same circuit?
Also, two of my injectors measured 12.9 ohms resistance, the other two measured 13.5 ohm. Any cause for concern? Should I make sure to pair the two 12.9s and the two 13.5s on the same circuit?
'67 Beetle, 2276
MS-1 v3.57
MS-1 v3.57
- MinamiKotaro
- Posts: 2071
- Joined: Sat Aug 06, 2005 6:26 am
Re: lean cyLinder
Update:
Cylinder #2 was still lean even though I swapped the injector. Cylinder #3 was also lean -- not as lean, but notably leaner than #1 and #4. #2 and #3 are on the same circuit. I got to thinking: a long time ago, one of the injector wires pulled out of the relay board and grounded against the case. Perhaps that injector circuit was damaged, somehow. I got a new relay board and this seems to have fixed the problem. Plugs #2 and #4 look exactly the same as #1 and #3. Also, my AFR has changed dramatically (richer) so I guess those injectors are firing better. Had to retune.
Edit: Did a compression test on #2 and #4 (easy to get to) and they were both with a couple psi. The valve clearance was also good.
Cylinder #2 was still lean even though I swapped the injector. Cylinder #3 was also lean -- not as lean, but notably leaner than #1 and #4. #2 and #3 are on the same circuit. I got to thinking: a long time ago, one of the injector wires pulled out of the relay board and grounded against the case. Perhaps that injector circuit was damaged, somehow. I got a new relay board and this seems to have fixed the problem. Plugs #2 and #4 look exactly the same as #1 and #3. Also, my AFR has changed dramatically (richer) so I guess those injectors are firing better. Had to retune.
Edit: Did a compression test on #2 and #4 (easy to get to) and they were both with a couple psi. The valve clearance was also good.
'67 Beetle, 2276
MS-1 v3.57
MS-1 v3.57