RichardK
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| posted on 6/2/11 at 12:55 PM |
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I originally thought this was the problem, jets were 1.55 on the pinto 1.6 and increased them to 1.75 because of this issue.
Feels like ignition, but maybe its not
Gallery updated 11/01/2011
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David Jenkins
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| posted on 6/2/11 at 01:51 PM |
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Originally I thought that my jets were too small, so I increased them - and the problem got worse!
I suggest that you either need a rolling-road session, or the use of an AFR meter...
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r1_pete
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| posted on 6/2/11 at 03:20 PM |
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Are you comitting the map to the megajolt? if you don't it reverts to default when you switch off? guess who was making that mistake when I did
my 2nd install on the Jag
Just had a nosey in your archive, are they 9R carbs? if they are it could be an air leak on the diaphragm/s. I sealed mine by filling the groove with
rubber lube, a leak will cause poor pickup, so if you've had the lids off its worth checking.
[Edited on 6/2/11 by r1_pete]
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RichardK
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| posted on 6/2/11 at 04:13 PM |
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I am commiting the MJ and indeed I think I'm going to need commiting soon!
The carbs are Honda Hornet CB600 and worked great on the Pinto, have just sat on the shelf for 4 months while I did the new engine.
Think I'm going to accept defeat and go to Boggs.
Cheers
Rich
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SPYDER
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| posted on 6/2/11 at 05:50 PM |
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Hi again Rich.
Can we assume that you have tried 155 jets as well as 175?
Geoff.
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RichardK
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| posted on 6/2/11 at 06:16 PM |
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Yes mate, thats what they originally had in and had the same symptoms, I was expecting to have to up the size slightly so didn't think much of
it when I went on its first run.
Cheers
Rich
Gallery updated 11/01/2011
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SPYDER
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| posted on 6/2/11 at 06:41 PM |
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Do you have any smaller jets?
I've got some spare if you want to try things out yourself.
Are your carbs standard apart from the jet change?
I would have thought that if they worked on the Pinto then they ought to rev out on the Zetec, even if a bit rich or lean.
Should you be trying stronger springs?
Geoff.
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RichardK
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| posted on 6/2/11 at 06:43 PM |
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Yeh, thats whats doing my head in, thinking about trigger sensor?
Gallery updated 11/01/2011
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SPYDER
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| posted on 6/2/11 at 06:50 PM |
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You might try wiring in a 10K resistor across the VR sensor. In parallel. Or 15K. Or 20K.
I've seen this problem on the MS forums and they suggest it.
Geoff.
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RichardK
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| posted on 6/2/11 at 07:27 PM |
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Now wondering if the crank sensor off and auto mondy is different to the manual one, I know the housing was and that got changed but used the same
sensor?
1999 mk2 mondeo
Cheers
Rich
[Edited on 6/2/11 by RichardK]
Gallery updated 11/01/2011
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omega 24 v6
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| posted on 6/2/11 at 09:11 PM |
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I had to do what spyder recommends with the resistors on my v2.2 but it would not rev at all beyond 2500rpm under any circumstances. Also I know that
big daz and scoobylav had problems with their flywheel based vr sensor and IIRC had a few of differing lengths from autos and manuals ( different
flywheels) I think. BUT If yours IS reving beyond they 3krpm under a light load I still doubt it'd be the crank sensor or it wouldn't do
it at all surely. You could try a tooth log in tuner studio and see what it looks like mind you.
[Edited on 6/2/11 by omega 24 v6]
If it looks wrong it probably is wrong.
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RichardK
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| posted on 6/2/11 at 09:44 PM |
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Ah, interesting, does tuner studio work with megajolt then? Thought it was a squirt thing.
Cheers
Rich
Gallery updated 11/01/2011
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omega 24 v6
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| posted on 6/2/11 at 09:48 PM |
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Well it is a squirt thing yes. I am getting confused in my old age. What about an oscilloscope?? friendly college or tv repair shop perhaps.
If it looks wrong it probably is wrong.
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RichardK
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| posted on 8/2/11 at 12:36 PM |
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1.4mm seems to be loads better, just need to find out why the revs are all over the place on the jaw logging thingy.
Cheers
Rich
Gallery updated 11/01/2011
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SPYDER
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| posted on 8/2/11 at 07:40 PM |
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Hi Rich.
Which ignition map are you running?
Does the car start OK?
Have you had the chance to try different maps?
Next step? Smaller jets? New plugs?
Geoff.
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RichardK
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| posted on 8/2/11 at 08:07 PM |
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Hi mate, at the moment I've found a safe zetec map on the autolabs site that I've put on, will start to play with ign when I have a bit
more time, going away with work for a few days so wont be able to play. But today I got the jets down to 1.4mm and got the carbs balanced spot on,
its a bit of a pita the do the jets but can't help thinking that they need to gown down slightly even further maybe 1.3 or 1.35.
Have some new plugs ready to go in when Its sorted.
Why? You got a cunning plan?
Cheers
Rich
Gallery updated 11/01/2011
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paulf
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| posted on 8/2/11 at 08:46 PM |
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It could be the jets are to large as if they were correct for a 2 litre pinto then a zetec will probably use less fuel as they seem to be more
economical than pintos due to a newer more efficient design.I found with megasquirt that if i went to rich the engine would refuse to rev crisply on
full load and when I cut the fueling back a bit it picked up much better.
Paul
quote:
Originally posted by RichardK
Hi mate, at the moment I've found a safe zetec map on the autolabs site that I've put on, will start to play with ign when I have a bit
more time, going away with work for a few days so wont be able to play. But today I got the jets down to 1.4mm and got the carbs balanced spot on,
its a bit of a pita the do the jets but can't help thinking that they need to gown down slightly even further maybe 1.3 or 1.35.
Have some new plugs ready to go in when Its sorted.
Why? You got a cunning plan?
Cheers
Rich
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kylerichmond
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| posted on 4/6/11 at 11:03 AM |
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Your not alone with this problem, i have exactly the same issue, the car drives well however when the throttle is wide open it splutters, ive been
from 1.6mm to 2.0mm jets with no success, however i blocked the air corrector jets and it did improve the situation, i now need to make sure that i
have a good map befor i visit Bogg Bros.
Has anyone got a suitable 2d map for a 2.0l Zetec Zx9 Carbs that they know is good?
Email kylerichmond16@hotmail.com
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