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93 Mk1 Starts then dies, fault 10

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alexcruncha
Posts: 4
Joined: Wed Jun 13, 2018 5:35 am

93 Mk1 Starts then dies, fault 10

Postby alexcruncha » Wed Jun 13, 2018 6:28 am

Hello members,

The other day I was driving my 93 Mk1 Eunos for around an hour and just as coming home the engine died. When I tried to restart it, it fired up for around 1 - 2 seconds then died. I have tried several times over the last few days but it just starts for 1-2 seconds and dies. So now it is permanently broken down.

I have read it could be CAS, AFM, ignitor amplifier, coil pack, bad connectors/wiring to many places, vacuum leak and a few other things.

To diagnose it here is what I have learned so far:

1. Tachometer is working.
2. Putting a jumper on F/P and GND in diagnostics box doesn't help the car run (although I hear the relay and fuel pump working when I do this)
3. Using an LED there is a fault code stored, I disconnected the battery and retested before starting and fault code was gone. I attempted to restart and the same fault code returned. I appear to have fault code 10. I see one long flash being repeated every 4 seconds (followed after the initial 5 second flash). At first I wasnt sure if it was fault code 1 or 10 but I did see youtube videos of how long the flashes last for to indicate the tens or 1-9 part of the code. I see the tens part of the code is indicated by a flash lasting around 3/4 of a second while the 1-9 part of the code is indicated by a flash lasting around 1/4 of a second. My flash definitely appears to be more closer to a second so I believe it is a fault code 10 being stored (Intake air thermistor in airflow meter).
4. The AFM being connected or disconnected makes no difference to symptoms. Problem still exists in exactly same manner.
5. Pushing the throttle when trying to start will increase the engine speed for the first 1 - 2 seconds the car starts but will not help it run any longer than 1 - 2 seconds.
6. Tried taking the fuel cap off.
7. Disconnected and reconnected electrical connections to AFM, CAS, Igniter but no luck.
8. Car had new lead/plugs as well as silicone water and vacuum hoses a couple of months back (so I believe these are all fine)

I am a bit stumped with this one as I have read CAS is usually fault codes 2 or 3 and ignition related problems are usually fault code 1 while AFM problems are usually 8 or 10. The thing that gets me stumped is that I read that jumping F/P and GND will usually get the car to run if it is an AFM issue and this doesnt work for me. Also, the fuel pump appears to be working as I can hear it going when jumpered. Since it will always consistently die within a couple of seconds (no matter how much throttle or if the fuel pump is going) I am more inclined to believe it is an ignition problem but the fault code shows otherwise.

As of yet I have not tested to see if its sparking past the initial 1-2 seconds. So thats my next test.

Does anyone with more experience than me have any ideas? Either way I will update this post as I make progress.
alexcruncha
Posts: 4
Joined: Wed Jun 13, 2018 5:35 am

Re: 93 Mk1 Starts then dies, fault 10

Postby alexcruncha » Wed Jun 13, 2018 10:38 pm

An update:
I found that the car continuously sparks if I keep cranking the engine but the plugs are dry. Therefore, this suggests to me it is a fuel issue rather than an ignition one. I think that rules out a few things.

Also, I can keep it running if I give it plenty of throttle and switch the ignition on/off rapidly.
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Re: 93 Mk1 Starts then dies, fault 10

Postby Mazda Mender » Thu Jun 14, 2018 6:29 am

1.6 or 1.8 ?
M-m
The Disclaimer:-
This post is a natural product made from recycled electrons. The slight variations in spelling and grammar enhance its individual character and beauty and in no way are to be considered flaws or defects, the articles/answers/comments are provided for information purposes and they are not intended to substitute informed professional advice, I or mazdamenders.net cannot personally be hold responsible for any damage occurred from following this procedure or any injuries from it. Proceed at your own risk.


Mk 1 Eunos 93 black V.S II 1.8 ,
Mk 2 .1/4 Roadster 99 black & gold V.S 1.8 being rebuilt,
Mk 1 Eunos 90 1.6 (claimed by daughter)
MK 2.1/4 Blue V.S Roadster 1.8 99 ...being rebuilt

http://www.mx5oc.co.uk/ http://www.mx5nutz.com/forum/ http://miata.net/ http://www.autolinkuk.co.uk/
alexcruncha
Posts: 4
Joined: Wed Jun 13, 2018 5:35 am

Re: 93 Mk1 Starts then dies, fault 10

Postby alexcruncha » Thu Jun 14, 2018 9:51 am

Mazda Mender wrote:1.6 or 1.8 ?
M-m

Its a 1.6

Also, I pulled back the carpets to inspect the ECU and connectors to make sure there was no connector damage, water ingress or rust. I also opened the ECU and inspected the board to make sure there were no burned components. Visually it all looked to be in perfect condition and no signs of any issues (however I do appreciate ECU issues might not be visible). But at least I ruled out a few things there.
alexcruncha
Posts: 4
Joined: Wed Jun 13, 2018 5:35 am

Re: 93 Mk1 Starts then dies, fault 10

Postby alexcruncha » Thu Jun 14, 2018 4:33 pm

The following post describes the exact same symptoms I have with the exact same fault code. In that case it turned out to be the ECU:
https://www.mx5oc.co.uk/forum/yaf_posts ... way.aspx?=

I deduct from all my research and testing my issue is likely to the the CAS or the ECU. I have ordered both parts second hand from the bay along with a new CAS o-ring (so even if it is not the CAS I will at least change the o-ring which looks to be leaky on mine). I will post the results I have with them when they arrive.
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Re: 93 Mk1 Starts then dies, fault 10

Postby Mazda Mender » Fri Jun 15, 2018 6:13 am

It is more than likely going to be the CAS buddy.
M-m
The Disclaimer:-
This post is a natural product made from recycled electrons. The slight variations in spelling and grammar enhance its individual character and beauty and in no way are to be considered flaws or defects, the articles/answers/comments are provided for information purposes and they are not intended to substitute informed professional advice, I or mazdamenders.net cannot personally be hold responsible for any damage occurred from following this procedure or any injuries from it. Proceed at your own risk.


Mk 1 Eunos 93 black V.S II 1.8 ,
Mk 2 .1/4 Roadster 99 black & gold V.S 1.8 being rebuilt,
Mk 1 Eunos 90 1.6 (claimed by daughter)
MK 2.1/4 Blue V.S Roadster 1.8 99 ...being rebuilt

http://www.mx5oc.co.uk/ http://www.mx5nutz.com/forum/ http://miata.net/ http://www.autolinkuk.co.uk/

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