Renault Megane (1996 - 1998) - 98 1.6 RT Over-revving and misfiring

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Fri 18 Jul 2008 10:23
98 1.6 RT Over-revving and misfiring - susiejean
Please could someone help me before I go insane. I have a Reanult Megane RT Sport 1.6, which I bought about 3 months ago. During the test drive it almost ran out of fuel, as the seller had run it so low. After running it for about 4 days or so, it started to splutter pulling away from junctions,roundabouts etc, and also when over taking (very unnerving!). It also then developed a peculiar revving pattern. Started at 500, then once the engine heated up would shoot up to 1900. If you turn the steering full lock the revs decrease instead of increase. we took out and cleaned the ecu connections as they had a bit of corrosion, and, lo, the car ran perfect for about 4 weeks. Then out of the blue it started again. Cleaning didn't help this time, nor did changing the ecu plug (huge re-wiring job!), nor changing the idle control valve, or the ect sensor. We have even tried another,decoded, ecu, but still to no avail.
We've run out of ideas, please help!
Susan
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Fri 18 Jul 2008 14:33
98 1.6 RT Over-revving and misfiring - Screwloose
Susan

Renault - in their wisdom - use various engine and fuelling set-ups on these in '98; do you happen to know which engine code you have in yours?

Have you ever had it plugged in and the fault-codes and live data examined; if one sensor isn't reading, this could be a 5-minute fix.
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Fri 18 Jul 2008 21:23
98 1.6 RT Over-revving and misfiring - susiejean
I'm not sure how to tell. Is it the same as the ecu code? I know it ends with a 203 off the top of my head.
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Fri 18 Jul 2008 23:26
98 1.6 RT Over-revving and misfiring - Screwloose

No; it's going to be K4M or K7M followed by a 7 and two other digits. It's on the engine block just the gearbox side of the oil filter.
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