Intermittent starting (1.8TS) - Alfa Romeo Forum
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(Post Link) post #1 of 7 Old 03-04-12 Thread Starter
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Intermittent starting (1.8TS)

'51 Plate 156 1.8TS.

Has started playing silly bu**ers and only starts when it wants to. Sometimes its fine (doesn't matter if cold or warm) and other times it turns over, but won't fire. Once running its fine.

To rectify, I try it a couple of times - wait for 30 secs - try it again and it works. Any suggestions? Had the thermostat replaced recently by my specialist, but I don't consder that to be the issue (was fine for nearly 2 weeks afterward).
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I had exactly the same symptoms on one of my 145 Cloverleaf's.

It was the crank sensor.

On measuring the resistance of it, I found it had a very high resistance, something like 100k Ohms, where as it should have been around 1000 ohms.

You should be able to locate the brown plug near the rear corner of the cambelt cover, unplug it and check it with a multimeter.

My theory is that the heat cycling the sensor gets when the engine warms/cools causes the windings to break down, giving a poor output.
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Is the code light turning off?
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(Post Link) post #4 of 7 Old 04-04-12 Thread Starter
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Don't have a multimeter, will see if I can track one down!

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Originally Posted by Teflon Shoulder View Post
Is the code light turning off?
This for the immobiliser? I believe it is, yes - will double check next time it decides it doesn't want to play!
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It is possible that you will get a good reading even from a faulty sensor, but if you do get a high resistance reading at least you know that the sensor is the problem.

At least they are fairly cheap for CF2 and CF3 cars, when I bought a sensor for my CF1 145 QV I think it cost about 60
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Hi, Had simmilar prob with GTV TWINNY, Try cleaning terminals on fuel pump relay and also earth connecting cable between engine and body.
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Always check the earths. Mine didn't go because the earth to the starter was rubbish. Crank sensor is always a likely culprit, but so can the ICV which is what stopped my engine from running when I fitted it last year.
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