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Intermittent failure to run

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rewind647
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Joined: Wed Jul 15, 2015 5:01 am

Intermittent failure to run

Postby rewind647 » Thu Jul 16, 2015 6:16 am

I had an intermittent fault on my G Reg Mk1 Eunos which took me four weeks to find, it was driving me mad! The car would start and run normally sometimes, other times it would completely refuse to start or it would stop for no apparent reason. I tried changing the ECU, Ignitor, Coil Pack, Plugs, Leads, Fuel Circuit opening relay, all with no success. Sometimes it would start with PF/GND linked to get the fuel pump running, other times that did not work. Eventually changed the Cam Angle Sensor for a used one off a scrap car and bingo, no problems. Now runs as sweet as a nut.

Hopefully this might save someone some time and frustration if they have a similar problem.

Cheers,

Rewind
sheffj
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Re: Intermittent failure to run

Postby sheffj » Sat Aug 15, 2015 9:08 pm

Interesting and good detective work to solve that one!

I had a similarish problem. Sometimes I'd turn the key and my Mk1 Eunos would not turn over. If I waited a while and kept trying it would then start as normal. This seemed to be completely random. Even when the car would not start the immobiliser LED would still go out just as it should do implying that the immobiliser was working fine.
I did discover that when failing to start there was no voltage at the starter solenoid. After cleaning the ignition barrel and still no closer to solving the problem I untaped and exposed all the wiring to the immobiliser and found that when the car wouldn't start there was no output to the starter solenoid from the immobiliser. On taking the immobiliser apart I found that the soldered connection to one of the connector pins was cracked. I therefore went over all the connector pins with a soldering iron and found that the problem seemed to be sorted. That was 6 months ago and it's started first time ever since.

The immobiliser is an AUTOWATCH 171PPi

Hope this might be helpful to someone else who may have had similar problems. I think it's caused by stress and vibration at the connector resulting in cracking of the connector pin solder joints. Chances are if it's happened on my car then it will have happened to someone else who has the same or a similar immobiliser fitted.
1993 BRG Mk1 1.6 Eunos V Special
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Mazda Mender
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Re: Intermittent failure to run

Postby Mazda Mender » Mon Aug 17, 2015 7:34 am

Menders in the house guys :text-goodpost: :clap: :clap: :bow-yellow: :bow-yellow:

Well done lads.
:handgestures-thumbup:
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Mk 1 Eunos 93 black V.S II 1.8 fettling,
Mk 2 .1/4 Roadster 99 black & gold V.S 1.8 being rebuilt,
Mk 1 Eunos 90 1.6 (claimed by daughter)
Mk 1 Eunos 96 1.8 blue B2...being fettled
Mk1 Eunos 93 1.6 black S special **gone**
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liam7200
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Re: Intermittent failure to run

Postby liam7200 » Tue Nov 24, 2015 8:35 pm

Good work pal, I'm doing a similar thing at present but i think mine is the fuel pump it self.. replacing one thing at a time haha and it always the last thing you think off :)
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storm
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Re: Intermittent failure to run

Postby storm » Fri Mar 25, 2016 5:01 pm

When i got my 5 it did something similar. One day she just refused to start. Tried the CAS, fuel pump, removed the immobiliser, coil pack ignition barrel, fuel filter, plugs, wires, spark amplifier, relays,..... turns out the solders on the AFM had given up .

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