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K11 Tuning & Mechanical
low revs on cold idle
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<blockquote data-quote="crispy" data-source="post: 499072" data-attributes="member: 13014"><p>Hello All,</p><p></p><p>I recently purchased a 2001 K11 Micra. Everything appears to be OK except for low engine speed on cold idle (idle when warm is fine - with higher revs than when cold). When moving the car whilst cold the engine almost stalls each time the clutch is pressed with no throttle but the revs pick up just before the engine dies.</p><p></p><p>The car has recently had a new throttle body fitted - Bosch type so no waxstat and no idle adjustment screw (which wouldn't be any use anyway as idle when warm is at the correct rpm).</p><p></p><p>I have checked the coolant temp sensor for the ECU and it is working normally (measures approximately 2.5k ohm at 20C and 450 ohm at 80C) also it is getting the correct 5V supply at the connector.</p><p></p><p>I'm beginning to suspect that the idle adjust valve is to blame but I don't know how to go about checking it's operation. Also I would have thought that it was the IAV that is kicking in and increasing the revs just before the engine dies each time that I change gear whilst the engine is cold. The IAV itself came with the new replacement throttle body.</p><p></p><p>The plugs are the correct Bosch type and were replaced about 2000 miles ago. I replaced a very old fuel filter yesterday but it made no difference to this problem.</p><p></p><p>There are no warning lights illuminated on the dash.</p><p></p><p>Any suggestions as to what I should try next would be appreciated.</p></blockquote><p></p>
[QUOTE="crispy, post: 499072, member: 13014"] Hello All, I recently purchased a 2001 K11 Micra. Everything appears to be OK except for low engine speed on cold idle (idle when warm is fine - with higher revs than when cold). When moving the car whilst cold the engine almost stalls each time the clutch is pressed with no throttle but the revs pick up just before the engine dies. The car has recently had a new throttle body fitted - Bosch type so no waxstat and no idle adjustment screw (which wouldn't be any use anyway as idle when warm is at the correct rpm). I have checked the coolant temp sensor for the ECU and it is working normally (measures approximately 2.5k ohm at 20C and 450 ohm at 80C) also it is getting the correct 5V supply at the connector. I'm beginning to suspect that the idle adjust valve is to blame but I don't know how to go about checking it's operation. Also I would have thought that it was the IAV that is kicking in and increasing the revs just before the engine dies each time that I change gear whilst the engine is cold. The IAV itself came with the new replacement throttle body. The plugs are the correct Bosch type and were replaced about 2000 miles ago. I replaced a very old fuel filter yesterday but it made no difference to this problem. There are no warning lights illuminated on the dash. Any suggestions as to what I should try next would be appreciated. [/QUOTE]
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low revs on cold idle
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