Unusual starting problem

Leads, coils, plugs, starters, starting probs etc.

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Re: Unusual starting problem

Postby Brit-Car-Nut » Wed 15.08.2018, 23:48

I was thinking of an actual retail shop that has the proper test equipment to diagnose the car.
ABSOLUTELY no intention to disparage Neil in any way.

If it was me, I would buy the cheaper version of the CTS and swap it out and know for sure that isn't the cause. Time spent guessing is certainly costly after a while. It wouldn't hurt to have a spare anyway.
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Re: Unusual starting problem

Postby SimonW » Thu 16.08.2018, 22:20

Thank you. I'll send Neil a message and look at purchasing another CTS and report my findings later next week.
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Re: Unusual starting problem

Postby Enright » Fri 17.08.2018, 08:33

Morning, did someone shout? :wink:
I'll send you my number by PM Simon, and we'll see if we can sort something out.
It might be a good spark to re-kindle my enthusiasm.
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Re: Unusual starting problem

Postby dapinky » Fri 17.08.2018, 10:10

Enright wrote:It might be a good spark to re-kindle my enthusiasm.


Well, if you need an incentive, get yer ar$e down to Hethel on 29th September :poke:
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Re: Unusual starting problem

Postby SimonW » Fri 17.08.2018, 10:22

Thanks Neil, I'll be in touch. Is there a Lotus event at Hethel?
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Re: Unusual starting problem

Postby dapinky » Fri 17.08.2018, 10:32

SimonW wrote:..... Is there a Lotus event at Hethel?


viewtopic.php?f=28&t=26814
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Re: Unusual starting problem

Postby SimonW » Fri 17.08.2018, 11:08

Great, I'll take a look.
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Re: Unusual starting problem

Postby Enright » Fri 17.08.2018, 13:15

End of September... might be do-able. Bunging an alternator on one of mine and knocking a few finishing touches off the list is feasible. But I'm not supposed to be hijacking Simon's thread. :oops:
Anyway he's been in touch, so hopefully we can sort something out. Never know - if I can sort his, maybe he can help me with mine, meaning we might BOTH be able to make it! ;-)
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Re: Unusual starting problem

Postby SimonW » Thu 13.09.2018, 15:58

Update.
The car passed it's MOT after having the rear brakes stripped and cleaned.

The emissions were:
CO 2.33
HC: 212

The starting problem still exists but the car drives fine, so I'll continue to investigate.
I'll look forward to meeting some of you at the Lotus event later this month.
Thanks for the help! :cheers:
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Re: Unusual starting problem

Postby dapinky » Thu 13.09.2018, 17:23

I presume that those figures are running 'open loop'?

Just checking mine from a couple of weeks ago and I had readings of 0.62% & 96ppm (running with an O2 sensor, closed loop Everest chip)
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Re: Unusual starting problem

Postby SimonW » Thu 13.09.2018, 17:31

Yes, the car is running an open loop.
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Re: Unusual starting problem

Postby ElanBRG » Sat 15.09.2018, 21:38

Not sure if it was mentioned in any of the replies, but I would start by checking the timing. If it’s off, it can cause starting to take more cranks.
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Re: Unusual starting problem

Postby SimonW » Sun 16.09.2018, 19:21

Success!
The fault was being caused by a faulty ECU!

Thank you to Neil for lending me his spare :cheers:

If anyone has one for sale, please send me a message.
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Re: Unusual starting problem

Postby Enright » Tue 18.09.2018, 11:36

This was a really strange fault - I've certainly never seen it happen before.

The issue was definitely the ECU - specifically the circuit that controls priming of the fuel system.
It's as if the ECU held open the injectors during the pre-ignition priming cycle, which then flooded the engine.
The fuel smell upon starting was quite overpowering, and the only way to tackle it was to turn the key to start the engine ASAP, rather than waiting for the fuel pump to stop priming (exactly as Steve said in his first post).
Trying a standard ECU that I had in my parts collection cured Steve's issue instantly.

Thing is, there were no fault codes, and other than the starting issue the ECU worked perfectly, which only made it stranger; you would expect it to either perform faultlessly or not at all.

This makes me wonder if anyone knows any specialist ECU repairers that might be able to fix the dodgy circuit and so save Steve some money...?
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