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Unread 01-24-2007, 12:28 PM   #1
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Default Hesitation, jerky rev counter, missing?

Hi all from a newby

my son has a nissan almera 1500 hatchback 2001 model, and it has now developed a slight miss like a sparkplug has misfired and also it has become hesitant when accelerating.
The rev counter has also started to act erratically, it is jerky and keeps dropping slightly.

It has the coil packs fitted directly above the sparkplugs.
We have tried fitting new plugs and also two new coilpacks, replacing each one at a time but it doesn't make any difference.

I have heard that there is something called a PTU (power transistor unit) that might be fitted somewhere in the engine bay that is controlled by the ecu and controls these coilpacks and that it might be the cause of this intermittant miss and the jerky rev counter.
Can anyone advise if this could be the culprit and have any idea of what it looks like and where it is fitted?

Already wasted a load of money on the coilpacks and need help if possible?

Or does it sound more like a CAS (crankshaft sensor) problem if it has one?

Spoke to Nissan dealers over phone who passed me on to a mechanic who advised to bring it in immediately as he suspects its the timing chain and would cost 1200 to repair????????????????What

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