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Old 24-04-2013, 12:12 PM   #16
cooper_mark
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surley it shouldn't effect fueling much..?
i'll have a search on the web for some info
thnx birdman
Done a few tests on the hall sensor
Took the dizzy off and found the green wire had broken away
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Old 24-04-2013, 12:33 PM   #17
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do you think the broken green wire is the problem with poor m,p,g ??? i hope so that would be nice,,
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Old 24-04-2013, 12:54 PM   #18
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Theirs a good chance as it all links back to the ecu
Which i think in turn tells the ecu to lean out or add more fuel according to ignition timing.. Well thats my theory..
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Old 24-04-2013, 12:59 PM   #19
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that will be a big result if tizz,, when will you no???
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Old 24-04-2013, 01:00 PM   #20
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Done a few tests on the hall sensor
Took the dizzy off and found the green wire had broken away
Well Done Mark. Good, the wiring is quite fragile with that plug, that's probably why it was giving constant high volts. If nothing else this needed sorting anyhow.

If this doesn't fix it, I've heard a lot of the time people have had rough running or poor MPG it can usually be the coolant temp sensor CTS and doesn't always throw up a fault code. The CTS output is used as the main correction factor in the Motronic injection and ignition system. So if it's playing up it will effect the cars running. I'm planning on building up a few spare parts / sensors whilst they are still available so I can swap out stuff and carry some in case of breakdowns.
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Old 24-04-2013, 02:57 PM   #21
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that will be a big result if tizz,, when will you no???
yeh i hoping its that wire was causing the fueling problem and i'll be running it dry put a gallon of fuel in and see from there

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Well Done Mark. Good, the wiring is quite fragile with that plug, that's probably why it was giving constant high volts. If nothing else this needed sorting anyhow.

If this doesn't fix it, I've heard a lot of the time people have had rough running or poor MPG it can usually be the coolant temp sensor CTS and doesn't always throw up a fault code. The CTS output is used as the main correction factor in the Motronic injection and ignition system. So if it's playing up it will effect the cars running. I'm planning on building up a few spare parts / sensors whilst they are still available so I can swap out stuff and carry some in case of breakdowns.
the CTS sensor will be the next thing to look at if fueling is still poor had the same problem with my zafira
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Old 24-04-2013, 04:18 PM   #22
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resoldered the green wire took the battery off for 10mins to reset the ecu and now 94 Hall Effect Switch (HES) High voltage dosn't flash any more...
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Old 24-04-2013, 04:29 PM   #23
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resoldered the green wire took the battery off for 10mins to reset the ecu and now 94 Hall Effect Switch (HES) High voltage dosn't flash any more...

Hell yeah, we're good at this bananas! Going back to CTS, pull the plug off the sensor and take a look at the contacts. Because it works on resistance, if the terminals look nasty or even varnished get in there will some wet n dry or a needle file. Then the resistance in ohms should be what it really is and not more due to poor contacts. If the resistance is higher than it should actually be the ECU will lengthen the injection periods and alter the timing as well = using more fuel.
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Old 26-04-2013, 02:52 PM   #24
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took the mini out a couple of times and fueling seem way better....
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Old 26-04-2013, 03:02 PM   #25
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smash it !!!! result for west brom,, hard to think that 1 poxy wire could do that,,
any firm evidance that is is better??
dose it feel better, are you gunna rip the cat off
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Old 26-04-2013, 03:42 PM   #26
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westbrom.....!!! i'm miles away from their...lol
yes does feel much smoother on acceleration...and i dont see my fuel gauge move when i give it some right foot....
i'm keeping the cat on for the meanwhile only because i welded it straight onto the manifold but i will be looking at making some flanges and i'll be making up a decat pipe..
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Old 26-04-2013, 03:47 PM   #27
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west brom,,lol, must be close,, i can bairly see over my hedge,lol
this is a good result.. nice work,
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Old 26-04-2013, 06:23 PM   #28
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westbrom.....!!! i'm miles away from their...lol
yes does feel much smoother on acceleration...and i dont see my fuel gauge move when i give it some right foot....
i'm keeping the cat on for the meanwhile only because i welded it straight onto the manifold but i will be looking at making some flanges and i'll be making up a decat pipe..
This is all good news. Keep trying stuff out, so that when I'm on the road I can just look at your threads and I'm away..
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Old 26-04-2013, 07:49 PM   #29
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This is all good news. Keep trying stuff out, so that when I'm on the road I can just look at your threads and I'm away..
when i 1st put this post up i thought it was a bit of a waste of time but if others are in the same situation then hopfully this solution will help someone some day
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Old 28-04-2013, 12:41 PM   #30
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That's a good result!

I am interested in this as the C20XE put into the Model A a couple years ago has been having an overfuelling problem ever since! We haven't yet tried that ECU error light trick so will give that a go. Will also suggest he cleans up the CTS like Birdman said. It's a coilpack engine so wont be hall sensor unfortunately
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