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Afternoon all
Cosworth v6 fitted to mk2 sons sierra
We’ve got it to fire on what appears to be one cylinder , but its just kicking and wont run on any more
Micro squirt ecu, with edis 6, new injectors, plugs, leads
I’m now at the limit of my knowledge
Short of returning the loom to microsquirt anything obvious we might have missed
Distance diagnostics, don't you just love them! 🙄
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mk2cossie
Club Retro Rides Member
Posts: 2,953 
Club RR Member Number: 77
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First checks I'd be doing is compression check on each cylinder, is each injector getting fuel and/or squirting, and is each spark plug firing at either end of its lead?
Other than that, what crank shaft sensor is it using, and what type and size injector?
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Compression should be fine, just rebuilt, will have another check on leads
Standard crank sensor, with Bosch 6ve-a5a injectors
Wondering if the pump isnt up to the job?
Thanks for your help
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Plug lead order? Which is also affected by the order you have wired the primaries. It doesn’t help that not all the 6s that used the EDIS had the same firing order so going by the label doesn’t always produce the expected result.
Beyond that I’d be wondering whether the injectors are stuck, they sometimes need a little percussive reminder if they’ve been sat a while
Nick
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1967 Triumph Vitesse convertible (old friend)
1996 Audi A6 2.5 TDI Avant (still durability testing)
1972 GT6 Mk3 (Restored after loong rest & getting the hang of being a car again)
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mk2cossie
Club Retro Rides Member
Posts: 2,953
Club RR Member Number: 77
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Also, are the fuel lines connected the correct way round  And plug lead order should be...  |
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Cheers mk2cossie and vitesseefi, looks like he’s spending the day under the bonnet! Will update how it goes Thanks again |
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Also, are the fuel lines connected the correct way round And plug lead order should be... Just looking more carefully at that pic Order on coilpack is 1,2,3,4,6,5 from bottom left going clockwise? Or has my brain fallen down the back of my neck again? 🤔 |
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mk2cossie
Club Retro Rides Member
Posts: 2,953
Club RR Member Number: 77
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Also, are the fuel lines connected the correct way round And plug lead order should be... Just looking more carefully at that pic Order on coilpack is 1,2,3,4,6,5 from bottom left going clockwise? Or has my brain fallen down the back of my neck again? 🤔 No, you have read that correctly  As that is the way the cylinders are paired for wasted spark |
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Cheers will give it a try
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Dec 14, 2021 18:37:51 GMT
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Sorry to drag up an old thread, but still no joy with this
He's now stripped it of its microsquirt, and rewired the standard boa ECU, using ECU pinout diagrams and an edis 6
Upshot - still won't run
There's a good spark, and the plugs are getting wet, but it's not even coughing
He's on the verge of throwing the whole lot in the bin and fitting a rover V8 instead, carbs and dizzy
Is it possible for an ECU to die, but still have a spark from the edis?
All and any suggestions gratefully received!
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Dec 14, 2021 18:39:26 GMT
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Alternatively does anyone know of a good automotive electronics expert Norfolk/cambs area?
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Dec 14, 2021 19:20:59 GMT
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oh right, sounds a but like the problems i had with mine at first. Ive microsquirt of a b230 in my bmw e36, now the problem i had was the crank sensor, its a cossie one, but the signal needed dropping down with a resistor, it just couldnt see what was going on and kinda randomly fired. At first i put a variable resistor inline with the sensor, and just turned it until the car finally started. ALso you need to make sure itll do full revs. I think i ended up with a 100 ohm [maybe completly wrong there] inline with the sensor. I also still on the sensor to wheel gap of like 4mm, but the car runs mint now.
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16grit
Part of things
Posts: 213
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Dec 14, 2021 19:22:23 GMT
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Compression should be fine, just rebuilt, will have another check on leads Standard crank sensor, with Bosch 6ve-a5a injectors Wondering if the pump isnt up to the job? Thanks for your help
Sounds frustrating! I've read that he's now back on the Ford ecu but when you were experimenting with the Microsquirt what trigger wheel / tooth pattern were you using?
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Dec 14, 2021 19:36:23 GMT
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Yes, it is possible to get a spark without any action from the ECU as EDIS is designed to keep on sparking at fixed 10deg BTDC if no timing signal from the ECU.
However, as the plugs are getting wet, it sounds like the ECU has enough life to fire the injectors and they are even passing fuel. Seems odd that even after a total change of management……
Did it ever get compression tested? Does it even sound like it’s pumping air?
Nick
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1967 Triumph Vitesse convertible (old friend)
1996 Audi A6 2.5 TDI Avant (still durability testing)
1972 GT6 Mk3 (Restored after loong rest & getting the hang of being a car again)
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Dec 14, 2021 19:36:33 GMT
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That sounds just like the problem he was having with the microsquirt bmw2101, it would at least kick and fire with that. Now we've gone back to the ford setup it does nothing but crank 16grit it's the standard ford/cosworth crank sensor and missing tooth setup, think it's 36-1 but it's outside and dark so can't check currently Cheers both 👍 |
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Dec 14, 2021 19:39:06 GMT
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We didn't get as far as a compression test vitesseefi, the plugs are so deep in their sockets my tester doesn't reach Think I'll have to buy a longer one, or make an adapter It does sound like it's got compression tho' Also bmw2101, is the resistor in series or parallel with the crank sensor? Cheers Edit- just read the inline bit! DOH! |
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Dec 14, 2021 19:56:37 GMT
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if he still had the microsquirt on it, he can do a data log file and upload it to the ms forums, and someone would have told him what was up.
stupid questions are
has he put an engine earth back on it
fuel is going the right way threw the fuel rail, fuel goes in and gets limited on the end of the fuel rail
microsquirt had he put the right crank sensor offset into the settings
has he tried putting a strobe on it to see if its firing in the right place or at all?
are all the sensors grounded on the block in one place?
check the wiring for the edis, maybe he has wired it wrong or its faulty? that would make both ecus fail!
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Last Edit: Dec 14, 2021 19:58:08 GMT by bmw2101
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Dec 14, 2021 20:17:40 GMT
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Ok, in some sort of order;
Yep, engine earth and sensor earths are fine
Fuel is right way round
Crank offset was input into the microsquirt settings, a strobe has been used, but there is a spark, and apparently there's a reason a strobe will give a false reading? Not sure about that one,??
We did think the edis had blown and bought another, but it hadn't, so now we've got two, wiring should be fine,checked and double check, tuning studio was relating to the setups fine, and allowing us to make changes.
Unfortunately on the cosworth v6 you can't adjust the crank sensor spacing, it's two fixed bolts
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ChasR
RR Helper
motivation
Posts: 10,194
Club RR Member Number: 170
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Dec 14, 2021 20:51:54 GMT
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Unlikely, but I may as well ask.
-With the Megasquirt, was it getting a crank signal? You can see what RPM the engine is doing via the Live Data.
-Has the crank sensor been tested on resistance? What brand is it, and has another been tried? I've had Intermotor cam sensors fail on before with no warning despite being 8 months old.
-Regarding the firing order, has it been confirmed which cylinder is which? I know on Stags, they are timing up using the no. 2 Spark Plug and that is the first passenger side cylinder closest to the crank pulley. Peugeots, however, work from No.1 being at the flywheel end.
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Dec 14, 2021 21:02:05 GMT
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Have you tried filling the inlet manifold with easystart and seeing if it fires up for a few seconds? If it runs it pretty much ties it down to the fuel system.
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