flak monkey
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 posted on 15/4/09 at 05:25 PM |
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Really peed off now
I have, quite frankly, had enough of the GTS now
I cannot fix this erratic rpm issue, all the suggestions have been tried and many more to boot. As far as I can see there is nothing wrong with any of
the ignition or fuelling system.
All of this leaves me with a car which is undriveable at motorway speeds with Stoneleigh less than 3 weeks away.
So fed up now 
Sera
http://www.motosera.com
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jacko
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| posted on 15/4/09 at 05:29 PM |
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Calm down have a cup of tea and start again 
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Guinness
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| posted on 15/4/09 at 05:35 PM |
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3 weeks? Plenty of time to get that Duratec in then! 
Mike
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flak monkey
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| posted on 15/4/09 at 05:39 PM |
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When its not under load the engine kind of hunts, which suggests to me that the ignition timing is fluctuating. Under load you just see sharp rpm
spikes and misfires.
I am seriously considering fitting the edis, but if I screw it up there's no going back and certainly no time to fix it before stoneleigh.
If a std dizzy fixes it then I can live with the performance hit until the duratec is installed.
David
Sera
http://www.motosera.com
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James
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| posted on 15/4/09 at 05:39 PM |
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Could you borrow enough bits off other MS pinto engined people to keep swopping bits out to isolate the problem further.
Have you posted it up on the MS forum as well? To get the opinions of the likes of Bill Shurvington(sp?) etc. on it?
Wish I knew enough MS to help you!
Good luck,
James
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"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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piddy
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| posted on 15/4/09 at 05:39 PM |
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Hi. Just remind me again what your running? Is it Pinto,MS,Edis,throttle bodies?
or Mega jolt and Carbs
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omega0684
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| posted on 15/4/09 at 05:44 PM |
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piddy : he is running tb's and MS to control the fueling with electronic dizzy for ignition
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flak monkey
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| posted on 15/4/09 at 05:45 PM |
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Hi Martin, Running pinto with megasquirt doing fuel onlyon gsxr 750 TBs and H&H ignition solutions electronic dizzy which was brand new when I
built the engine.
Have posted the problem on the MS forums here, have had a few suggestions, but only one guy seems to be bothered:
http://www.msextra.com/viewtopic.php?f=4&t=30851
Got my post removed from the std MS forums as I have an extra ecu, not that I am using that bit of it!
Sera
http://www.motosera.com
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MautoK
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| posted on 15/4/09 at 05:47 PM |
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Don't worry, you're not alone.
My MK has been on the road since the 3rd of April, 12 days, and I've done 12 miles in it so far. At the moment the engine and box are coming out
of the car so I can put another gearbox in.
Having holed the gearbox sump pan on my first drive, then fixed that, on the second try it wouldn't change out of first gear
Apart from that, it's brilliant, and worth the grief!
John.
He's whittling on a piece of wood. I got a feeling that when he stops whittling, something's gonna happen. (OUATITW/Cheyenne)
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flak monkey
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| posted on 15/4/09 at 05:48 PM |
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The most annoying thing is I had a similar issue on carbs which turned out to be a loose rotor arm, but I dont know if that was hiding this problem or
not. Wish I had the carbs here now to find out!
Anyone got a pair of DCOE's set up for a pinto I could borrow? LOL
David
Sera
http://www.motosera.com
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Gazeddy
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| posted on 15/4/09 at 06:00 PM |
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would i be right in assuming youve checked for vac leaks
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piddy
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| posted on 15/4/09 at 06:00 PM |
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I don't think I can help. I do have a pinto Dizzy you can borrow if it would help. Have you tired Different plugs and plug leads? Have you spoke
to Phil at Extra EFI
www.extraefi.co.uk
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flak monkey
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| posted on 15/4/09 at 06:06 PM |
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I would expect, if I had a minor air leak for the engine to hunt at idle and for my AFR to be all over the place. I will investigate though. I dont
understand how it could cause rpm spikes at only certain RPM.
I havent spoken to Phil at extra efi as the ecu is one of Bill Shurvingtons IIRC. I'll mail him and see if he has any suggestions though.
Sera
http://www.motosera.com
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piddy
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| posted on 15/4/09 at 06:08 PM |
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I Spoke to Phil when I had problems and my unit was from the US. He was really helpful and even offered to take a look at the MS for me. He came to
one of our meetings as well.
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hellbent345
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| posted on 15/4/09 at 06:12 PM |
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bad news chap was it like this when you took me out? i didnt notice anything if it was! hope you get it sorted soon
Alan
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flak monkey
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| posted on 15/4/09 at 06:13 PM |
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quote:
Originally posted by hellbent345
bad news chap was it like this when you took me out? i didnt notice anything if it was! hope you get it sorted soon
Alan
Hi Alan, yes it was, but I managed to hide the problem then. Its ok when accelerating hard, but bad when cruising at high rpm....
Sera
http://www.motosera.com
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flak monkey
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| posted on 15/4/09 at 06:14 PM |
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quote:
Originally posted by piddy
I Spoke to Phil when I had problems and my unit was from the US. He was really helpful and even offered to take a look at the MS for me. He came to
one of our meetings as well.
Thanks Martin, I will send him a mail.
Cheers,
David
Sera
http://www.motosera.com
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sebastiaan
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| posted on 15/4/09 at 06:17 PM |
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Could you convert to EDIS? the big advantage is that this used OEM equipment for the "difficult" part (i.e. measuring engine speed and
determining TDC correctly on a running engine). For the Duratec you also cannot use a distributor engine speed input, you'll need to go 60-2,
probably using wheel decoding (that'll be lots of fun too!)
I'm using MSExtra (fuel and spark) on a pinto myself, triggered by an injection dizzy with external coil amplifier (bosch type). After LOTS of
fiddling i'm still not impressed with the stability of the RPM signal and the ignition advance. I'd very much prefer an EDIS setup, but
have got other things to do at the moment....
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DIY Si
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| posted on 15/4/09 at 06:23 PM |
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Does it hunt when it's on the driveway, or only under load/driving? Would it be possible to get a 'scope on it to double check the
coil?
Also, is there anyway the dizzy drive can slip on a Pinto?
“Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.”
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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flak monkey
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| posted on 15/4/09 at 06:23 PM |
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I can convert to edis (and plan to use edis on the duratec too and already have an edis sitting next to me on my desk) but if that doesnt solve the
problem then I am royally screwed as I wont have time to try anything else before stoneleigh.
The other issue is my MS ecu will need modifiying to work with EDIS and no-one can tell me what I need to change. The instructions on the MS Extra
wesbite dont tell you what the starting point is for the mods, and it seems no one does! My ecu currently has twin coil drivers built in.
Sera
http://www.motosera.com
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flak monkey
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| posted on 15/4/09 at 06:25 PM |
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quote:
Originally posted by DIY Si
Does it hunt when it's on the driveway, or only under load/driving? Would it be possible to get a 'scope on it to double check the
coil?
Also, is there anyway the dizzy drive can slip on a Pinto?
If you rev it over 3500 on the drive the revs jump about and it seems like the engine is hunting. Underload its sharp rpm spikes on the datalog and
feels like the engine is missing.
Dizzy is driven by a worm gear on the pinto, so it can't slip.
Sera
http://www.motosera.com
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brianthemagical
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| posted on 15/4/09 at 06:26 PM |
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You say on the MS forum topic that the dash shows the spike, is this a tacho seperated from the MS.
Sounds like it's nothing at all to do with the MS, more the coil.
What about trying a timing light, see if it's giving dodgey spark.
You could always run with a toothed wheel if needs be.
Are you sure the dizzy is wired up correctly? Maybe be talk to H & H but just say you've got RPM spikes on the tacho, but don't metion
the MS and see what they say.
Is there any reason you're not using spark from MS? Would be much better in the long run.
I know how you feel though, it's so frustrating that there's a problem with electroics that you can't alter or fix, and that cost a
fair few pennies. It's a mega good feeling whne you finally win, good luck.
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flak monkey
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| posted on 15/4/09 at 06:33 PM |
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The dash shows the spikes too, which is connected direct to the coil and not driven by the MS.
I am no longer convinced its an MS issue either and more a problem with the distributor in some way.
Could a faulty coil cause the same problem? That was also brand new and is a cossie type dry coil rather than a std wet type
Sera
http://www.motosera.com
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gregs
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| posted on 15/4/09 at 06:36 PM |
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Flak - try running it with the lights off - guessing might be ht lead break down??, or just get a new set to rule out. Mates 911 had something similar
and it lit up like a fireworks display in the dark with the lid open.
[Edited on 15/4/09 by gregs]
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sebastiaan
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| posted on 15/4/09 at 06:38 PM |
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I trust you've seen this: linky
I thought that is all you need to know. As far as I can see, the hardware changes should be very limited. What hardware are you running?
The tach spikes you are getting are normally closely related to the distributor RPM input option. Are you still running fuel only or fuel and spark?
You'll get it sorted out, don't worry!
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