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yeah not totally sold on megasquirt....but what ive spent on parts and time with a car i cant use maybe its the answer? like i say at least if i ask a question on that hopefully someone would have the answer , vs these old polos theres no alot of help
loom
first one sent away to a fella on the vw forums thats been doing them years for a check and repair , still no go , he fully made a fresh one with all new wires , then ive bought a unmolested original one ..all 3 run the same , tried several relays and 5 ecu !!!
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91 golf g60, 89 golf 16v , 88 polo breadvan
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goldnrust
West Midlands
Minimalist
Posts: 1,872
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Nov 25, 2019 12:42:54 GMT
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It does sound like you've been through all the electrics then!
Continuing to try and think at other causes/problems...
Are you confident the timing mark you're checking against is in the right place? Marks on pulleys can slip etc. How is the timing changing when warm? Advancing or retarding?
As you say you're using an AFM, any vac leaks could cause big problems? Where does the idle control draw it's air from?
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Last Edit: Nov 25, 2019 12:43:14 GMT by goldnrust
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Nov 25, 2019 13:20:10 GMT
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as per the piccy...5 degs is base timing and happy...moves off to the pink mark when warm yes 100% happy on timing marks , ive had vw's for years and no doubts about it afm has an air bypass screw it has to be electrical ...nothing mechanical is moving on its own
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91 golf g60, 89 golf 16v , 88 polo breadvan
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ChasR
RR Helper
motivation
Posts: 10,191
Club RR Member Number: 170
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Nov 27, 2019 20:05:04 GMT
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So it goes to 10 Deg ATDC once warm?
Something is not right there. On EU fuels, that's a super conservative timing register to go to, even for an OEM!
I take it Digifant can't kick out any codes, no matter how meaningless?
How did you set your base timing and what is your 'all=in' ignition timing with say 3000-4500rpm?
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Last Edit: Nov 27, 2019 20:11:04 GMT by ChasR
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Nov 27, 2019 20:51:27 GMT
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it gives a few basic trouble codes and some live data , nothing that helps me diag the fault
base timing set as per the vw method , hot engine , pull temp sender rev to 3k three times , set to 5deg @ 2250 revs and reconnect sender , ive set it and checked it dozens of times , tried it with /without the sender on , more or less base timing nothing make the fault go away
would need to check the timing at 3-4000...id suspect its alright , seems ok above idle it drives ok with no wierdness , even a quick rev and it shoots back to 5 deg but quickly creeps off again
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Last Edit: Nov 27, 2019 21:04:50 GMT by steveo3002
91 golf g60, 89 golf 16v , 88 polo breadvan
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ChasR
RR Helper
motivation
Posts: 10,191
Club RR Member Number: 170
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So it is setup right then . I'd still see what the codes are, no matter how meaningless they ; they can sometimes hint to the issue depending on how the car sees the problem. It will be interesting to see what the 'all-in' figure is.
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well to my mind its set up right yeah...set my mates ones with same tools /method and that doesnt do it
yeah i often scan the codes /look at the data , it all checks out far as i can see , batt voltage , coolant temp , afm temp , tps 02 signal ...only thing is timing which does similar to what i observe with the strobe
I'm assuming the ecu considers the signal from the tps,o2 and afm , mixes it up and decides what to do , the tps and o2 can be checked and seen to be ok ...so can the afm be giving the right mixture but still be wrong ? the tps shows 0% so yes idle , but could the flap be being sucked beyond what the ecu see's as an idle position ?
the afm is the only mystery bit i cant fully test ...yes it gives an accurate air temp , yes the mixture is alright but is there other mystery to it?
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91 golf g60, 89 golf 16v , 88 polo breadvan
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Nov 28, 2019 18:55:45 GMT
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does it have a lambda sensor? tried disconnecting it?
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Nov 28, 2019 19:49:52 GMT
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does it have a lambda sensor? tried disconnecting it? yes and yes also gives off what appears to be normal signal when viewed on the live data
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91 golf g60, 89 golf 16v , 88 polo breadvan
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Nov 29, 2019 23:42:41 GMT
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Could this be something utterly random like interference in a non shielded/ badly shielded wire from the crank sensor or cam sensor? Have you tried disconnecting the alternator or other sources of electrical noise.
Appreciate I'm grasping at straws here...
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no crank or cam sensor ...only the hall sensor , I'm sure it is something very silly
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91 golf g60, 89 golf 16v , 88 polo breadvan
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Jan 22, 2020 15:32:55 GMT
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still havent been able to fix this , ive gone for a microsquirt and see how that goes , so if anyone has any helpfull tips I'm sure i will need them
with all the spares i have i should be able to sell some and make it affordable
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91 golf g60, 89 golf 16v , 88 polo breadvan
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Jan 22, 2020 21:50:09 GMT
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still havent been able to fix this , ive gone for a microsquirt and see how that goes , so if anyone has any helpfull tips I'm sure i will need them with all the spares i have i should be able to sell some and make it affordable If you are going the micro squirt route fit a proper trigger wheel on the crank pulley, trying to re-use a suspect dizzy to give a crank signal is asking for trouble.
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1988 Mercedes w124 superturbo diesel 508hp 1996 Mercedes s124 e300 diesel wagon 1990 BMW E30 V8 M60 powered! 1999 BMW E46 323ci project car
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got it running on microsquirt now
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91 golf g60, 89 golf 16v , 88 polo breadvan
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