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post #1 of 18 (permalink) Old 21-07-2006, 17:24 Thread Starter
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Odd behaviour!

On the way back home the car acted very odd. It wouldn't drop below 1500 rpm and when i put my foot down, it misfired for a split second and then picked back up.

it'll rev quite happily over 2000, but just doesn't like it when its around 1500 and you put the foot down.

If you're gentle with your foot, the revs will climb, no problem, but if you put your foot down a bit too quick, it momentarily cuts out and then picks back up again.

My thoughts are leads & dizzy cap - any other ideas.

Runs smooth as a nut over 2000 though.

Checked coolant & oil, both are fine.

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post #2 of 18 (permalink) Old 21-07-2006, 17:32
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Mine was being really strange having a high idle and feeling a bit lumpy, and revs not dropping. Thought i'd give it the 'ignition on and press accelerater 5 times, then off/on' resetting the stepper motor. Worked on mine.

Not the same fault but wouldn't harm in trying I guess, before you get carried away..
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post #3 of 18 (permalink) Old 21-07-2006, 17:37 Thread Starter
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Forgot to say, it has been misfiring occasionally before now - haven't noticed it since we came back, but the leads & dizzy cap / rotor arm probably need replacing anyway.

Just wondering if its likely to be the same cause, although I don't know why it would clear itself over 2000 rpm if that was the cause and idle at 1500

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post #4 of 18 (permalink) Old 21-07-2006, 18:22
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I'd go for the cap/rotor/leads - these can cause this very problem. Although thye looked perfectly ok when the engine was changed.
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post #5 of 18 (permalink) Old 21-07-2006, 18:53 Thread Starter
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Cheers m8. Guess I'll pop up to the dealer in the morning and see if they've got them in.

I hope they have, otherwise I'm going to get it in the neck from Kerrie!

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post #6 of 18 (permalink) Old 22-07-2006, 14:27 Thread Starter
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Well, I've just changed the leads, dizzy cap and rotor arm, finished just as it was starting to rain too!

The rotor did look to be quite worn on one side and one of the terminals in the dizzy cap had obviosuly been touching the arm as it was quite worn, cap itself did look quite new though.

We'll see if it makes any difference! Hopefully it will.

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post #7 of 18 (permalink) Old 22-07-2006, 22:35 Thread Starter
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Sadly it didn't - it still does the same.

When it did it this time, I turned around and it defintely smelt like it was running a bit rich, although that might just be because of the unburnt fuel smell coming out of the exhaust.

Could it be a sensor? I'm at a loss as what it could be.

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post #8 of 18 (permalink) Old 22-07-2006, 22:48 Thread Starter
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Thinking about it, I went to drop my m8 back home, the car was steamed up, so I stopped a few doors down from home (basically pulled off the drive and realised I couldn't see anything) and waited for it to clear. We were sat there for about 5-10 mins and I then noticed the temp gauge hadn't moved.

So I reversed back up to the house and then noticed it had started to move, so started to drive back. About 2 miles down the road is when it started to play up, by which time it had got up to temperture. I turned around, blipped the gas up to around 5,000 rpm and drove back, within a few hundred yards it had fixed itself and was back to idling normally again.

Could it be the temperature sensor? Just thinking that it may be thinking its hot and this is why it took a while to warm up. I've got the cooling system off a TF, which I didn't think worked that way, it works via a pressure sensor?

Any way, looks like I'll be dropping Kerrie off to work on Monday

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post #9 of 18 (permalink) Old 23-07-2006, 02:09
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Sounds like it could be the coolant sensor, other thoughts are a duff oxygen sensor or the cat on its way out.
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post #10 of 18 (permalink) Old 23-07-2006, 05:25
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Definately worth checking the connection to the temperature sensor Steve - you know where it is?

TF & MGF sensors are the same and in the same position.
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post #11 of 18 (permalink) Old 23-07-2006, 10:35 Thread Starter
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Where is it?

And whilst this would account for the slow warm up - would it account for the dodgy running under 2K?

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post #12 of 18 (permalink) Old 23-07-2006, 10:42
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It would, and is very interesting to me as my OH's 200 suffers from the same problem!

effectively the faulty sensor makes the ECU go into backup mode as far as the temperature reading goes (warm all the time). So when the engine was warming up it wouldn't get the fuel enrichment is would normally need.
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post #13 of 18 (permalink) Old 23-07-2006, 16:45 Thread Starter
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where is the sensor located?

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post #14 of 18 (permalink) Old 23-07-2006, 17:28
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post #15 of 18 (permalink) Old 23-07-2006, 18:28
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Yup, that's the beasty!
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post #16 of 18 (permalink) Old 23-07-2006, 19:29 Thread Starter
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Well, I've taken the connector off, looked at it, pushed it back on again and its still does the same. Is there anyway to tell if its bust?

I'll probably get another one tomorrow and change it over, but would be good to know if there is a way of knowing whether its shot.

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post #17 of 18 (permalink) Old 23-07-2006, 19:52
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Unfortuneately there is no way of telling Steve.

Only real test is by substitution.

They are only pennies anyway.
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post #18 of 18 (permalink) Old 25-07-2006, 07:38 Thread Starter
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Well, that's fixed it (touches wood).

Seems it was the temperature sensor.

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