Engine/electrical Expert?

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Engine/electrical Expert?

Postby davidjt » Thu 31.10.2013, 11:24

Crunch time has arrived :( :
I'm no further forward with the CEL problem - although more and more convinced that a previous fumbler has screwed up the wiring somehow. (The discovery of an injector earthing problem by another member reinforces this, although my own injector earth appears to be OK.) The car runs, drives and accelerates normally, except that the tickover has been wound back to solve a rapid t/o problem, so it's prone to stalling when cold. And the CEL is permanently lit, flickering occasionally. And it's running far too rich. Fuel consumption is dreadful, pops and bangs on the overrun and I'm now told that emissions are roughly twice the level permitted. M.O.T. expires in ten days. I can buy a timing light and attempt to re-set the base timing, but rather doubt whether this on its own will achieve the desired result. (3 different mechanics have proved unwilling to tackle this, even when provided with a WIKI-LEC print-out. Why is that?) My local Lotus specialists will probably do the base timing, but admit to having no real knowledge of the M100 and are reluctant to spend (very expensive) hours chasing one or more faults with no guarantee of success. (Honest, if not much help.) So, if anyone can suggest a real Elan expert who will sort it, I'm happy to take the car any distance and do the return journey by train if necessary. Failing that, I'm looking at selling the car (for parts?) at a huge loss.
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Re: Engine/electrical Expert?

Postby DaveT » Thu 31.10.2013, 11:40

Give Gerald at GST in Newmarket a ring. He's not too far from you and he knows the M100 like the back of his hand.

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Re: Engine/electrical Expert?

Postby Ade » Thu 31.10.2013, 12:04

Just a thought i had the problem with the injector earth and you have probably done this, but just checking and tightening the bolt is not enough. The bolt as to removed and the connector and mounting point as to be really cleaned and reassembled.
This fixed mine immediately but occasionaly when starting from cold it will over rev but settle down after, so I still believe the is something else that needs attention.

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Re: Engine/electrical Expert?

Postby GeoffSmith » Thu 31.10.2013, 14:25

If you've got a problem with the injector earthing then there may also be problems with general engine earthing. Engine sensors and particularly the CAS are a lot more sensitive than the injectors so all your problems may be inter-related. If you have a long enough jump lead, then it might be worth connecting it from the battery earth to the CAS housing to see if anything improves. Otherwise, as Dave says, give Gerald a ring - I'm sure he'll be able to sort it and he's a thoroughly decent bloke.
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Re: Engine/electrical Expert?

Postby davidjt » Thu 31.10.2013, 16:54

Many thanks for the rapid responses - I'll try a couple more things and then give Gerald a ring.
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Re: Engine/electrical Expert?

Postby Simon_P » Fri 01.11.2013, 01:33

Have you been able to run elanscan?

CTS?

edit - just read your other thread
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Re: Engine/electrical Expert? + BRAKES

Postby davidjt » Sat 16.11.2013, 12:32

Many thanks for the various suggestions. Gerald has got the car running sweetly - there's obviously no substitute for real expertise (and a lot of muppets out there who claim to be mechanics).

One other thing is worth mentioning - doing the pre-MOT, he pronounced the pipes from the master cylinder to be dangerously corroded(at the top!): replacing them doubled the bill, but the prospect of total brake failure made that decision a no-brainer. If you a running a J reg or earlier car with a chequered career, I would check your own pipes. (An MOT from a non-expert could well miss it.)
He also mentioned in passing that although big Willwood discs and calipers are a great improvement, hardly anyone (including me) takes into account that the master cylinder doesn't really have the capacity required. If track days are your thing, a bigger cylinder would not only be sensible but also give a more progressive feel, and a much smoother lap.

Now off for a top-down run in the sunshine! :D
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