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embarrassing start up and idle problem recently started - Engine/Ancilliaries - The Lotus Forums Jump to content
Jexsi

embarrassing start up and idle problem recently started

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Hi, I am new to the forum, I have had my 1996 v8 for about 18 months and it has been running great up until recently, when I start the engine from hot or cold I have a problem within either the first couple of minutes on idle or the first quarter of a mile of driving, car starts fine and idles well initially, then it seems to start misfiring and running on reduced cylinders? If I manage to dip the clutch and stop it stalling then as long as I can get the revs high it will eventually clear, after this it runs perfectly until I stop and restart when the problem comes back, there are no stored fault codes, I have reset the idle learning sequence and it still has the Same problem, help?

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Thanks Iain, I will check them out at the weekend with the diagnostics, I did have to repair the wiring loom to one of the O2 sensors a while ago, the condition of the actual wires was really bad due to the insulation being damaged, I did solder the wires together and it seemed OK but I will check again, thanks for taking the time to reply.

Shaun

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Iain

I also thought it might be fuel related but would that mean fuel starvation at all times? After this initial problem the car runs perfectly and has massive power, would a fuel issue not show up with higher fuel demands as well? where is the fuel filter located? This would be an easy way to change and eliminate that item Into guess.

Shaun

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Yeah, fuel starvation is less likely as it gets plenty at higher revs. It has to be sensor related, and now that you mention your recent repairs to the loom, I'd suspect the sensor or unfortunately the repairs. You are close!

Iain :)

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OK, All 4 O2 sensors seem to be reporting to the ECU so I think the wiring loom is OK, my car is not running any cats but has the PNM silenced decat pipes, the O2 readings were all varying between .2 to 1 volt, car still runs like a pig from start up after about 1 minute on tick over or about 500 yards driving, anybody got any other ideas? no fault code-showing over than the p0462 which is aparantly a fuel sensor missing from the early V8's that gets a fault code with Marcus's upgraded software? The other fault is P1462 which I think is air con related but I have never worried about this as I never use the air on, anybody got any ideas??

Forgot to mention that the exhaust gases on tick over coming from the exhausts are really different, from the right hand side it is more powerful and colder than the left hand side that feels warmer and less powerful?

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So... I took my old cats down to the local garage and for twenty pounds they removed the original lotus O2 sensors, cleaned them up and copper slipped the threads, then removed the brand new 02 non Lotus sensors that were fitted by a specialist with the new exhaust, whole job took less than an hour, fired her up and..... Completely different car, no lumpy idle, no misfire, ran a whole lot smoother, stopped and started then car 10 times with no issues at all, magic, seems like the V8 is very sensitive to 02 sensors.... If you have to change any then just buy the originals from Lotus, it's not worth trying to save a few quid and risking the nightmares I have had for the last 2 months, thanks to Iain for pointing me in right direction.

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Thanks to you for pointing me in that direction, by the way i had a silver S2 in the mid eighties with a lovely green velour interior!!, I was only 25 at the time and it proved to be a real magnet for the girlies!!!, not particularly fast but there were so few of them around that everybody assumed I was a millionaire or a football player, which I did use as my opening gambit in occasion, I have some pictures I can post. How's lotus ownership over there?

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Ha ha ha, oh to be 25!

I do get a laugh watching my wife's girlfriends sit in the car and 'drift' away to a time before kids and houses and responsibilities - good fun :)

There are quite a few esprit's in Australia, but given the vastness of the place it feels like I am the only one - never seen another g-car in the flesh :(

Every time I take her out it draws stares and wows, people come over and talk, chicks love it!

A great ownership experience :)

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Not a great picture but it was the 80's...

post-17853-0-15162000-1413196993.jpg

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Yup , I could have looked like Marty Feldman and still had my choice of girls... Special times, my mate had a 3.0 litre Capri and we used to pretend we were pilots when chatting up girls in bars, with cars tactfully parked right within full view of the whole local pub when we arrived... Now I'm fat old and sad.... Hebhe

My new babes buttpost-17853-0-07450700-1413273116.jpg

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Congratulations on fixing your problem but a word of warning; you should not use copper slip on the threads of a lambda sensor as it can contaminate the sensor and shorten its life. Only a lambda sensor safe lubricant should be used (I recall something about the OE pastes having glass beads in them).

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Have you sat in the back seat with him yet to give him a proper appraisal of his flying? :D

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Cool!!! Looks like great fun.

sailorbob, thanks for the advice on the copperslip,

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Hi Travis

Unfortunately I already returned them to PNM for a refund so I can not check manufacturer, the PNM part number is PNME0322.

Shaun

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