Fail to start

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Fail to start

Postby Mac1508 » Mon Jul 27, 2015 4:47 pm

Hello all, I'm new to this site and owning a MX5 so go easy on me :)

Had my 1996 1.8 import mk1 for 4 month now, bit of a project car. Me and my mate are fixing her up. However one day on a sunny jaunt she just died, no splutter no nothing. she is no longer firing any sparks. Our original diagnosis was the coils were way out on their resistances so after many failed purchases got the right set and replaced.....this however has not fixed it.

I am still not getting a spark, our next attempt will be replacing the ECU, next the CAM sensor. I really hope its not within the wiring loom otherwise she will be dead for the foreseeable future.

Any help much appreciated and glad to be part of the community.

Thanks again
Mac
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Re: Fail to start

Postby drumtochty » Mon Jul 27, 2015 6:16 pm

I would start with the cam sensor but that means nothing.

Sounds daft but are the are the camshafts turning, it's not a broken cam belt.

Have you check the continuity between the cam sensor and the ecu and the ecu and the connector to the coil packs.

Unlike the 97 Miata's I assume this car does not have a crank sensor, I believe that came in with the Mk2 in March 98.

You have checked the fuse box under the bonnet for a blown fuse.

I do not have a mk1 wiring diagram handy so cannot say which fuse and where it is.
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Re: Fail to start

Postby Mac1508 » Mon Jul 27, 2015 6:27 pm

Hia, we have checked and the coils are recieving power, but not outputting. Hence why we replaced them first, havent checked cam belt, but sensor appears in great condition.

Have literally just attempted a diagnostic with LED, and no blinks, so i removed the cam sensor and still no blinks.

Would this not indicate its the ECU, which i have arriving tomorrow anyway, but better safe than sorry.

Thanks again
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Re: Fail to start

Postby joeytalent » Mon Jul 27, 2015 7:00 pm

Have you checked the earths? There's a sneaky one at the back of the block I think.

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Re: Fail to start

Postby Mac1508 » Mon Jul 27, 2015 7:09 pm

Will look into it cheers Joey, but i think ino the one your on about and it semed pretty stable.
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Re: Fail to start

Postby drumtochty » Mon Jul 27, 2015 7:11 pm

I'm with Joey check the earths wires are to ground.

If you do the diagnostics you should get the longsh flash and nothing elss, so no stored codes or the longish flash then the stored fault codes.

A visual inspection of the cam sensor is of no use at all.

Try to find another MX5 driver that will let you try their cam sensor.

If there is no longish flash then that tends to the ecu but as it is an import there is I think no imobiliser so not a problem with keys etc.

You have a few checks still to do re wiring befor you buy anything.
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Re: Fail to start

Postby Mac1508 » Mon Jul 27, 2015 7:16 pm

Ok cheers guys,

When i do the diagnostic, it has the initial light on, for all of a second, then off....it is my understanding that that is when the flashes should start, correct me if im wrong. However it turns off and remains off.

I figured by removing the cam sensor wires and re-trying i should get an error. but alas still nothing, so i figure ECU.
But obv you know better than I.

Cheers again
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Re: Fail to start

Postby drumtochty » Mon Jul 27, 2015 7:23 pm

If you get the first flash and nothing that says the ecu is working but there are no stored codes.

So I'm know tending to you have a working ecu.

Looks like a wiring fault or a cam sensor but check that wiring.
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Re: Fail to start

Postby Mac1508 » Mon Jul 27, 2015 7:25 pm

Ok thanks, will check into both.
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Re: Fail to start

Postby Mac1508 » Mon Jul 27, 2015 8:16 pm

Guys, u were right to start with.....always the simple answer.

Cam belt broke, there was a bolt stuck in there...how i dont know. Will be fixed tomorrow, new belt it is.

Your help much appreciated
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Re: Fail to start

Postby drumtochty » Mon Jul 27, 2015 11:06 pm

Unless it was left in there, it can only be a water pump bolt that became loose!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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Re: Fail to start

Postby joeytalent » Tue Jul 28, 2015 7:09 am

Glad you got to the bottom of it.

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Re: Fail to start

Postby Mac1508 » Tue Jul 28, 2015 10:26 am

God only knows guys, further investigation hopefully tonight, but it is PISSING it down up here, so unlikely.

It is becoming more apparent its previous owner was doing stuff to this car, as i have the main and preliminary bolt missing on the coil packs, they are held by one of the top bolts alone atm.

I noticed the crack in the housing when i got her, my fault i didn't check it.

But yes i am very glad i at least know what is wrong with her :)

Thanks again for all suggestions
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Re: Fail to start

Postby Mac1508 » Tue Jul 28, 2015 8:31 pm

The bolt was one of two holding the cam belt cover onto the engine, and the other was loose.
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Re: Fail to start

Postby drumtochty » Tue Jul 28, 2015 8:50 pm

There are three cam front covers.

Top cover four bolts.

Middle cover one bolt.

Bottom cover three bolts.

I think further checking is required as there appear to be a few more missing.

They are M6 and can be bought cheap on ebay, the length does vary and get the flanged version.

In this instance you could use the A2 stainless that are the most popular as they are under virtually no stress but not good idea to use A2 stainless anywhere that is under any stress or tightness.

In that case use carbon steel grade 8.8.
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Re: Fail to start

Postby drumtochty » Tue Jul 28, 2015 8:56 pm

http://www.ebay.co.uk/itm/M6-M8-M10-Zin ... 566a720260

These are not stainless so are a the ones to get if needed assuming the length is correct.
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Re: Fail to start

Postby Mac1508 » Tue Jul 28, 2015 9:03 pm

drumtochty wrote:http://www.ebay.co.uk/itm/M6-M8-M10-Zinc-Steel-Flanged-Hexagon-Bolts-Flanged-Head-Hex-8-8-High-Tensile-/371153044064?var=&hash=item566a720260

These are not stainless so are a the ones to get if needed assuming the length is correct.



Ah perfect cheers mate. replacing belt tomorrow, hopefully have her going.
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Re: Fail to start

Postby drumtochty » Tue Jul 28, 2015 9:12 pm

I had a case of a broken fanbelt getting behind the crank pulley.

Rubbing against the lower cover and damaging it.

A bit of fan belt got into the cambelt and between it and the crankshaft drive pulley that drives the cambelt then the the camshafts.

It caused the cams to jump three teeth on the inlet cam and four teeth on the exhaust cam and stopped the car reving at all, changed everything, cam sensor, crank sensor,
coil pack, ecu aad immobiliser plus new keys cut.

Nothing worked, then talking to the tech get at the Pitlochry Spring Rally from the OC club he said we have had that before but on a different engine. take the cam cover off and check the cam timing.

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Last edited by drumtochty on Tue Jul 28, 2015 9:21 pm, edited 1 time in total.
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Re: Fail to start

Postby Mac1508 » Tue Jul 28, 2015 9:19 pm

Oh christ man.

Yeah covers off whole lot dissembled and new belt going on tomorrow, with new tension spring.

But certainly keeping an eye on those bolts to see if they loosen over time
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Re: Fail to start

Postby OldSpice » Tue Jul 28, 2015 9:59 pm

I'd chuck in a new water pump as well in the time honoured fashion while your there anyway.
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