Hi, i've recently installed microsquirt to my mk2 scirocco 2L 16v, all wired up ok me and a friend managed to get it to splutter and try and fire up when cranking it over but as soon as it goes above its 300rpm cranking speed its not fireing fuel, asif its not using the fuel map.
We altered the cranking speed to 3000rpm so that it would start up using the priming/starting fuel pulses and it runs, bit rough though!
Im completely baffled on why it doesn't seem to want to enter the fuel map.
hope i've explained this alright, my friend knows more than i do.
cheers
Julian
Engine only runs on cranking
Forum rules
Forum rules
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.
Forum rules
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
Re: Engine only runs on cranking
julian,
Lots of things could cause this. You need to post a datalog (see: http://www.megamanual.com/mt28.htm#f for how to do this) of a starting attempt and you settings (an MSQ file) before we can comment.
Lance.
Lots of things could cause this. You need to post a datalog (see: http://www.megamanual.com/mt28.htm#f for how to do this) of a starting attempt and you settings (an MSQ file) before we can comment.
Lance.
Re: Engine only runs on cranking
Here's a datalog of an attempted start.
- Attachments
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- cranking no start.msl
- (59.45 KiB) Downloaded 68 times
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Bernard Fife
- Super Squirter
- Posts: 1009
- Joined: Mon Feb 16, 2004 3:15 pm
Re: Engine only runs on cranking
julian,
It looks like your MAP sensor might not be connected. I say this because the MAP value is very high in the datalog (200+) and steadily climbing. These are the classic symptoms of an ADC channel left open.
Lance.
It looks like your MAP sensor might not be connected. I say this because the MAP value is very high in the datalog (200+) and steadily climbing. These are the classic symptoms of an ADC channel left open.
Lance.
Re: Engine only runs on cranking
Cheers, we'll try this, any ideas on how to sort the MAP sensor issue, when i'm only running TPS?
Also any other ideas if that doesn't solve the issue.
Also any other ideas if that doesn't solve the issue.
Re: Engine only runs on cranking
If you have no MAP sensor, then make sure you have no 'Barometric Correction' or any other such factors selected. You're not doing anything mad like running Speed / Density with no MAP sensor, are you?
If you post your .msq file, we could have a look...
If you post your .msq file, we could have a look...
Re: Engine only runs on cranking
I don't run a map sensor, just a throttle position pot, could you confirm which settings I should be running for ALPHA N please?
Attached is the .msq file of the current map/set up.
EDIT: just noticed there are values in the barometric correction.
Attached is the .msq file of the current map/set up.
EDIT: just noticed there are values in the barometric correction.
- Attachments
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- first attempt.msq
- (25.23 KiB) Downloaded 66 times
Re: Engine only runs on cranking
Anyone had the chance to view the files i've posted up?
cheers
J
cheers
J
Re: Engine only runs on cranking
Your msq shows you have selected Pure AlphaN mode, which is correct for no MAP sensor.
Your engine dies after cranking for probably one of 2 reasons - it is losing ignition synch or the fuel mix is off. From your datalog, it looks like ignition synch is ok. But you are never getting over 100 rpm. It stays at 100 rpm but won't go higher, so it seems like either it's flooded or there is no spark. It doesn't enter the fuel table because it's in cranking mode, and the fuel PW in cranking is a fixed number depending on the coolant temperature - which is pretty cold. Your PW of 9.4 looks reasonable.
Are you sure you are getting spark while cranking ? Are the plugs gas soaked ? If you have a datalog of when it gets past cranking and starts firing and dies, show us that.
Your engine dies after cranking for probably one of 2 reasons - it is losing ignition synch or the fuel mix is off. From your datalog, it looks like ignition synch is ok. But you are never getting over 100 rpm. It stays at 100 rpm but won't go higher, so it seems like either it's flooded or there is no spark. It doesn't enter the fuel table because it's in cranking mode, and the fuel PW in cranking is a fixed number depending on the coolant temperature - which is pretty cold. Your PW of 9.4 looks reasonable.
Are you sure you are getting spark while cranking ? Are the plugs gas soaked ? If you have a datalog of when it gets past cranking and starts firing and dies, show us that.
Re: Engine only runs on cranking
Here's an attempted start, it did fire up, but then cut out after it goes past the 300rpm in "fuel set-up", "other fuel settings".
I changed the 300rpm to 3000rpm and it starts and runs, ish. But this datalog file is when its set to 300rpm as it should
I also changed the barometric settings to zero and this made no difference.
So any ideas where i'm going wrong!?
cheers
I changed the 300rpm to 3000rpm and it starts and runs, ish. But this datalog file is when its set to 300rpm as it should
I also changed the barometric settings to zero and this made no difference.
So any ideas where i'm going wrong!?
cheers