Plugs Fouling 71 s2 europa - LotusTalk - The Lotus Cars Community
 
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post #1 of 10 (permalink) Old 05-03-2015, 01:35 AM Thread Starter
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Plugs Fouling 71 s2 europa

Hello all,

So, i got my car back after three years in the shop. I picked it up Friday and later Friday brought it back because of the car back firing and running terribly.

Saturday they re did the timing and changed the plugs which were fouled.

Saturday afternoon I pick up the car again and its great (new plugs and timing is good)

Saturday night ~70 miles later the car is running bad and the plugs are fouled again. Thoughts?

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post #2 of 10 (permalink) Old 05-03-2015, 03:59 AM
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If you haven't already check in with the guys at Lotus Europa Community, and take a look at the EXTENSIVE Europa knowledge base at Lotus Europa Central.


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Owned, loved, enjoyed, and now gone:
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2006 Exige Graphite Grey
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post #3 of 10 (permalink) Old 05-03-2015, 04:55 AM
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Got a pic of the fouled plugs? Are they all the same or just SOME fouled?


Here's some clues:




PS, look carefully at the causes for carbon fouling (middle, bottom row)

Atwell Haines / '88 Esprit / Succasunna, NJ USA

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post #4 of 10 (permalink) Old 05-03-2015, 06:17 AM Thread Starter
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definitely carbon fouled.

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post #5 of 10 (permalink) Old 05-03-2015, 09:44 AM
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Sounds as if you have carb problems then. (too rich) <--- assuming they are ALL fouled.



What is status of carb? If recently rebuilt and jetted, could be old floats. (They are not buoyant if old, and they "sink", not closing the needle valve, allowing too much gas in.)

New floats are not part of most carb rebuild kits.

Atwell Haines / '88 Esprit / Succasunna, NJ USA

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post #6 of 10 (permalink) Old 05-03-2015, 10:00 AM Thread Starter
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I agree it feels like a carb issue. It is a new carb. It is jetted the same as the stock carb. Clearly there needs to be some tuning.

At idle its fantastic, and with new plugs I can run an easy 50 or 60 miles and it works perfectly. its after that it starts to act up. and the long it goes acting up, the worse it gets.

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post #7 of 10 (permalink) Old 05-03-2015, 12:08 PM
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Did you check what I listed on BS?

05 elise (BOE Rev300 supercharged, SSRs, shift tower mods, Multivex; HID hi/low beams); 05 Corolla XRS. Past '72 Elan Sprint (I restored), Lotus 7 w/X-flow, TT Supra, Bugeye Sprite, BMW 2002 & 2002tii, '65 GTO.

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post #8 of 10 (permalink) Old 05-03-2015, 06:02 PM
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New wrinkle.

The shop installed a fuel regulator. While I learned the newer side-draft Webers need less fuel pressure than the old ones, not sure if that's true about new down-drafts.

Told owner to mark the knob where it is now, then turn down at least 1/2 turn.

05 elise (BOE Rev300 supercharged, SSRs, shift tower mods, Multivex; HID hi/low beams); 05 Corolla XRS. Past '72 Elan Sprint (I restored), Lotus 7 w/X-flow, TT Supra, Bugeye Sprite, BMW 2002 & 2002tii, '65 GTO.

Driving Tips-https://www.lotustalk.com/forums/f10...art-1-a-49665/
Moss Emergency Line-https://www.lotustalk.com/forums/f10...cy-line-36631/
Bleeding Brakes- https://www.lotustalk.com/forums/f10...-brakes-241138
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post #9 of 10 (permalink) Old 06-18-2015, 02:37 PM
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I recently replaced a needle valve in my '73 Europa with the Stromberg carbs and noticed the needles sent me were a tad longer than what was previously in the rear carb. Sure enough it was actually too lean and was not starting as it should a litle adjustment for richer solved the problem. In your case it would be opposite and check the length of the needles could be shorter than originals,thus too rich.
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post #10 of 10 (permalink) Old 06-18-2015, 03:48 PM
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His is a single carb Renault engine.

I never liked Strombergs and got Webers for my Elan.

05 elise (BOE Rev300 supercharged, SSRs, shift tower mods, Multivex; HID hi/low beams); 05 Corolla XRS. Past '72 Elan Sprint (I restored), Lotus 7 w/X-flow, TT Supra, Bugeye Sprite, BMW 2002 & 2002tii, '65 GTO.

Driving Tips-https://www.lotustalk.com/forums/f10...art-1-a-49665/
Moss Emergency Line-https://www.lotustalk.com/forums/f10...cy-line-36631/
Bleeding Brakes- https://www.lotustalk.com/forums/f10...-brakes-241138
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