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Post by BikeTuna on Jan 17, 2017 8:21:15 GMT
Driving home from work yesterday the car cut out on me twice. Not very safely either, one in a 50 limit an one on a dual carriageway sliproad.
On the way in today it's done it 3 times, and in those times I've worked out that its the indicators. If I put an indicator on, or the hazards, the engine cuts straight away. The hazards speed up also, and I think the RH indicators but not the left, though not fully checked that.
ive recently changed the rear lights to a temp set while I refurb my tinted ones but they have been working for a week or so. I'll swap them back at lunchtime and see where I am but I cant see how it would change things, but then I cant work out how these things can be linked. But then I'm not good with electrics...
any ideas?
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Post by Horney on Jan 17, 2017 8:44:31 GMT
Sounds like an earthing problem. You're doing the right thing by looking at what has recently changed.
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Post by Rickster on Jan 17, 2017 16:58:08 GMT
Sounds like an earthing problem. You're doing the right thing by looking at what has recently changed. agreed, i had this on my 1.6 - kept almost cutting out at Castle Combe - not pleasant, put a second earth from chassis to battery in the boot, another from ppf to chassis and another engine to chassis, cured it.
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Post by BikeTuna on Jan 17, 2017 17:36:24 GMT
Didn't get anywhere at lunch, the fault happened exactly as expected cutting with the indicator, so disconnected the OSR lens and tried again, same. Started wiggling wires, now it won't reproduce. light back in, indicators work, cannot fault it.
Sounds like a good plan to do a couple of extra earths though, I'll get on that case shortly.
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pewe
Chats A Bit
Posts: 157
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Post by pewe on Jan 19, 2017 12:41:45 GMT
Sounds like an earthing problem. You're doing the right thing by looking at what has recently changed. agreed, i had this on my 1.6 - kept almost cutting out at Castle Combe - not pleasant, put a second earth from chassis to battery in the boot, another from ppf to chassis and another engine to chassis, cured it. The earthing point on the PPF can corrode to the extent the cable running from the battery parts company with the connector inside the insulation. On mine I had to re-solder the wire with some substantial wire to the connector before wrapping with self-amalgamating tape. Clean the ali of the PPF with a file to remove corrosion before re-bolting the connector then smother with grease - job's a good 'un. Cheers, Pewe.
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Post by BikeTuna on Jan 23, 2017 15:07:48 GMT
The fault is still happening... and its not funny losing power coming onto a motorway sliproad...
Ive replaced the rear lights back to the originals but still going. Ive replaced the OS side repeater too.
The fault is with the OS indicator. if the car is running the engine will cut when the indicator is switched on. If the engine is off the rear indicator flashes at double speed, the sidelight does not flash at all and the front flashes the sidelight instead of the indicator.
Where is the PPF earth point? Would this not be a problem for both indicators?
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Post by Rickster on Jan 23, 2017 18:18:59 GMT
Earthing and electrical problems can cause very strange and intermittent problems - often not logical. I would start with the earths as that is the most easy and cheap fix, if thats not it then you may have a loom issue, when you fitted and refitted the lights did you disconnect the battery?, if not you may have shorted a wire and melted a bit of insulation somewhere, it happens, though i would have thought that would blow a fuse The PPF earthing point is about halfway between the gearbox and diff on the PPF (power plant frame) IIRC. Its difficult to diagnose when I cant see the car but if it was ok before you changed the lights and its still happening it does sound like you've shorted something somewhere??
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Post by BikeTuna on Jan 24, 2017 8:05:00 GMT
The only thing that makes me think it isn't the lights is that I changed them with no lights on (ign off) and just disconnected the lead, the same way all the garages do it (Ive worked in garages for the last 10 years), which would impact the system the same as changing a bulb. The new lights were working for about 2 weeks before this started happening so I'm pretty confident I haven't done anything else.
First thing for me to do today will be to disconnect the OS headlamp and see if it still cuts out, so all lighs are eliminated, then start on cleaning the earth points. Hopefully get it in the air later today and find the PPF one.
Clocks ticking too... I'm in a 12car on Friday!
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Post by BikeTuna on Jan 24, 2017 19:24:24 GMT
So I've just spent a bit of time ono this and not had any luck.
I've found the ppf earth and cleaned it up so much I could insert it without risk of infection, still failing. I found another one near the back of the exhaust manifold but no different. I've disconnected all the osf headlight connections and the osr side repeaters and it's still happening.
It seems lie the indicator and the fuel pump relay are on the same circuit as the fuel relay is loudly ticking away at d9uble speed when the indicator is on, implying that they run a shared earth.
Does anyone know where that is?
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Post by BikeTuna on Jan 25, 2017 14:08:28 GMT
No progress at lunchtime either. Took out the trims around and under the steering wheel to wiggle-test the wiring, nothing.
I can now confirm though that its not the fuel pump relay ticking away with the indicator but the EGI relay, which implies an engine earth. I've bought a universal earth lead to start stretching around the bay in various places until the fault goes away.
Edit: Found 5 minutes, ran the earth from the block to the chassis, no difference.
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Post by BikeTuna on Jan 26, 2017 10:38:12 GMT
An interesting twist, I've just code read the car and got the following:
P0012 Camshaft position timing over-retarded P0335 Crankshaft position sensor circuit malfunction
Does that narrow it down at all?
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Post by Horney on Jan 26, 2017 14:03:17 GMT
Does sound like it could well be related.
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pewe
Chats A Bit
Posts: 157
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Post by pewe on Jan 28, 2017 15:53:54 GMT
Worth checking the CPS. IIRC there are checking procedures on miata.net. Whilst you're at it check the multi-plug and the wiring leading up to it. Some-one, who shall be nameless, changed the clutch as it was "slipping" only to discover there was a wiring fault in the CPS harness causing intermittent fluctuation in the revs - put that one down to the learning curve!! Cheers, Pewe.
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Post by BikeTuna on Feb 7, 2017 8:03:24 GMT
Sorry, forgot to update this...
Got the wiring diagrams out and found that both the OSF headlight and the main relay both earth on the point underneath the OSF headlight. Type it into google and all of a sudden theres loads of people with similar complaints so that's got to be it.
Took the front bumper off, headlight out, cleaned up the earth connection and refitted, and all is well.
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Post by Rickster on Feb 7, 2017 11:48:47 GMT
Glad you found it - it is always earth problems with these cars they are sods for it - rust is not a good conductor!!
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