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406oc.co.uk • View topic - intermittent non starting

intermittent non starting

Talk about the 406's electrical system, what wires do what, how to add extra functionality, etc.

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intermittent non starting

Postby straggler » Sat Oct 07, 2017 7:03 pm

I have a 96 XUDT and it's just developed a fault. Twice it has refused to start. It will turn over but not fire. There's no spluttering or coughing so I suspect that it may be an electrical fault. After removing and replacing ECU and immobiliser fuses plus disconnecting and reconnecting the battery it fired up and ran with no issues (including switching off and back on again a few times over the course of an hour or so driving). It was fine the following day but did the same today. This time I just disconnected and reconnected the battery and it fired up. I drove about 120 miles (including about 6 stops) and no problems.

There are no warning lights showing and once it's going it's fine. Any thoughts?

Thanks!
straggler
1.8 16v
 
Posts: 56
Joined: Fri Dec 09, 2011 8:20 am

Re: intermittent non starting

Postby steve_earwig » Sun Oct 08, 2017 11:16 am

The double relays were famously* (although not altogether undeservedly) unreliable on D8's. The one in the box with the ecu. One relay runs the ecu, the other the fuel pump.
Talking bollocks sin©e 2007

2004 D9 2.0 HDi 110 Estate lhd VF38ERHZF81657352 - now slod :( :( :(
1991 Yamaha TDM850
2008 Toyota Recall4 2.0 VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVTI ATM LHD JTMBH31V90D007261 - flimsy piece of crap.
1953 Matchless G3LS - Seriously!
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steve_earwig
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Re: intermittent non starting

Postby straggler » Sun Oct 08, 2017 11:38 am

straggler
1.8 16v
 
Posts: 56
Joined: Fri Dec 09, 2011 8:20 am

Re: intermittent non starting

Postby steve_earwig » Sun Oct 08, 2017 12:17 pm

Talking bollocks sin©e 2007

2004 D9 2.0 HDi 110 Estate lhd VF38ERHZF81657352 - now slod :( :( :(
1991 Yamaha TDM850
2008 Toyota Recall4 2.0 VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVTI ATM LHD JTMBH31V90D007261 - flimsy piece of crap.
1953 Matchless G3LS - Seriously!
User avatar
steve_earwig
Moderator
 
Posts: 18618
Joined: Thu Oct 04, 2007 6:09 pm
Location: Jastrebarsko, Croatia http://www.jastrebarsko.hr/lokacija/

Re: intermittent non starting

Postby straggler » Sat Oct 14, 2017 11:28 am

I had a good look round and everything and noticed in the manual there's a procedure to reset the ECU when the battery has been disconnected - switch on the ignition and wait ten seconds before starting the engine. I did this and have used the car several times (with about 20 starts) and no more problems. I'll use it for another week or so before declaring victory but I'm quietly optimistic!

Have another problem but I will start a new thread.
straggler
1.8 16v
 
Posts: 56
Joined: Fri Dec 09, 2011 8:20 am


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