NeilGC

My S2 has conked out

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My Elise S (Toyota 1ZZ engine) hadn’t been driven for 2-3 months, but it had been sat happily in the garage on a CTEK battery conditioner the whole time. I took it out yesterday, and after starting perfectly, 400m down the road it misfired once, the engine light came on, and then it staggered home increasingly slowly, misfiring all the way. Towards the end it stalled, and whilst it reluctantly restarted a couple of times, it ultimately refused to go at all. My lovely wife and our friend (also female) pushed the car the last 50m while I sat in it and steered (or at least claimed that I had to thumbsup.gif )

Once on the driveway, I noticed that when I turn the ignition on I can hear a whiring (which I think is the fuel pump) but also a frenetic, rapid clicking of a relay. It’s as if the relay is hunting, trying again and again to stay closed (or open) against some condition or other.

I measured the battery voltage. It’s 12.4V in the car with no load, and 11.7V with all lights and heater fan on. 12.6V out of the car. The Lotus driver’s manual says it should be 12.4V.  I don’t believe the problem is the battery because:

1. The engine cranks perfectly vigorously, but as soon as it catches it misfires and stops.
2. The little indicator on the battery shows green with a red dot, which it says means “fully charged”. It also looks pretty new, although the ‘fitted on’ date isn’t filled in; I’ve owned the car for 2.5 years. 
3. The relay ‘hunting’ carries on even with the CTEK connected.  
4. A friendly passing mechanic (my neighbour’s brother in law as it happens) has traced the clicking to the throttle body. He’s suggested (I) reading/resetting the MIL codes, then (II) carrying out a throttle body reset.

Any thoughts?  Many thanks. 

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Hi Neil,

Probably best to get the fault codes read first, as this may give the answer to your problem straight away.

If it is the throttle position sensor (TPS) that is at fault it will probably give you one of the following codes:

P0121 Throttle/Pedal Position Sensor/Switch “A” Circuit Range/Performance

P0122 Throttle/Pedal Position Sensor/Switch “A” Circuit Low

P0123 Throttle/Pedal Position Sensor/Switch “A” Circuit High

Performing a TPS reset may sort your problem. The TPS can fail and isn't repairable, so if it is faulty you will need to buy a replacement.

 

 

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Just re-read your post and noticed you said Toyota engine. Not sure if the Toyota engine has a TPS so my info may not be relevant.

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Might be the alternator on its way out .

Give James a call South West lotus .

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Thanks Eddie.  South West Lotus serves Milton Keynes??

  • Haha 1

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I also had a problem with the engine warning light coming on some years ago, same engine as yours. I took the car to an independent lotus specialist, they checked the software, contacted Lotus and found that there was an updated version which they obtained. Since then I've not had a problem. Might be worth exploring that idea before anything else. Hope you get sorted as i know how frustrating something like that can be.

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11 hours ago, NeilGC said:

Thanks Eddie.  South West Lotus serves Milton Keynes??

Give Allon white sports cars a call great to deal with.

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10 hours ago, A7ESK said:

Give Allon white sports cars a call great to deal with.

Yup, I know them well, and I like them a lot.  I’m just trying to minimise the financial implications ATM!  But I’ll be off to Allon White in Cranfield in due course, I’m guessing. 

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Great person to ask is James from my comments above tell him I said you to call him.

 

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16 hours ago, A7ESK said:

Great person to ask is James from my comments above tell him I said you to call him.

 

Thanks - will do. 

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