System is V3 MSII FW 2.36 and EDIS4
Can anyone check out this log and give a reply on what can cause these spikes, have tried to disconnect the alternator and there is no difference. Had a lot of noise that we got rid of by using multiple noise supressors and caps. Please help.....
Tach spikes, attached log
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Read the manual to see if your question is answered there before posting. If you have questions about MS1/Extra or MS2/Extra or other non-B&G code configuration or tuning, please post them at http://www.msextra.com The full forum rules are here: Forum Rules, be sure to read them all regularly.
Read the manual to see if your question is answered there before posting. If you have questions about MS1/Extra or MS2/Extra or other non-B&G code configuration or tuning, please post them at http://www.msextra.com The full forum rules are here: Forum Rules, be sure to read them all regularly.
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Bernard Fife
- Super Squirter
- Posts: 1009
- Joined: Mon Feb 16, 2004 3:15 pm
nissanN13,
To me, that looks lioke inteference from the spark plug wires or the coil. The reason I say this is that the interference seems to always aoccur around 5000 to 6000 rpm, it is prolonged, and it goes both up and down in rpm.
If this was mine, I'd:
- check that the tach signal wire for MegaSquirt is as far away from the coil and spark plug wires as convenient,
- check or recheck the grounds on MegaSquirt, the coil, and the engine are all perfect, and
- set the next pulse tolerance for normal running lower than it is now, probably about 1/2 of what is currently is.
If that doesn't help, you may have a voltage bias on the igntition system. To solve that, you may need to run a separate ground for the igntioon. See step 50.a.vi here: http://www.megamanual.com/ms2/V3assemble.htm#input
BTW, you have a lot of enginebit = 17 in your datalog, this is 16 + 1 = Accel enrichment + running. You might need to increase your TPSdot and/or MAPdot threshold a bit.
Lance.
To me, that looks lioke inteference from the spark plug wires or the coil. The reason I say this is that the interference seems to always aoccur around 5000 to 6000 rpm, it is prolonged, and it goes both up and down in rpm.
If this was mine, I'd:
- check that the tach signal wire for MegaSquirt is as far away from the coil and spark plug wires as convenient,
- check or recheck the grounds on MegaSquirt, the coil, and the engine are all perfect, and
- set the next pulse tolerance for normal running lower than it is now, probably about 1/2 of what is currently is.
If that doesn't help, you may have a voltage bias on the igntition system. To solve that, you may need to run a separate ground for the igntioon. See step 50.a.vi here: http://www.megamanual.com/ms2/V3assemble.htm#input
BTW, you have a lot of enginebit = 17 in your datalog, this is 16 + 1 = Accel enrichment + running. You might need to increase your TPSdot and/or MAPdot threshold a bit.
Lance.
thanks alot. Will try this tomorrow.
I had alot of noise before, with tons of resets. Have put in noise supressor before MS, before edis, and before coil. Also replaced edis capasitor, and put capasitor on alternator. alså "star" grounded the engine.
But good point in this being noise from ignition, as it's the same both with, and without alternator operative.
ps: can it help to ground the MS casing seperatly?
I had alot of noise before, with tons of resets. Have put in noise supressor before MS, before edis, and before coil. Also replaced edis capasitor, and put capasitor on alternator. alså "star" grounded the engine.
But good point in this being noise from ignition, as it's the same both with, and without alternator operative.
ps: can it help to ground the MS casing seperatly?
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Bernard Fife
- Super Squirter
- Posts: 1009
- Joined: Mon Feb 16, 2004 3:15 pm
You are saying that enginebit are showing something that has to do with accel enbrichment.
upon looking at my current program, this feature is disabled. ( I am not the one responsible for programming)
Is ther ea guide on how to set this up?
the scroller is on the far left side (map based) and all values is set to zero. Can this cause these issues?
what should the values be?
upon looking at my current program, this feature is disabled. ( I am not the one responsible for programming)
Is ther ea guide on how to set this up?
the scroller is on the far left side (map based) and all values is set to zero. Can this cause these issues?
what should the values be?
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Bernard Fife
- Super Squirter
- Posts: 1009
- Joined: Mon Feb 16, 2004 3:15 pm
nissanN13,
For the accel enrichment settings see this: http://www.megamanual.com/megatune.htm#ta
Lance.
For the accel enrichment settings see this: http://www.megamanual.com/megatune.htm#ta
Lance.