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K11 General Discussion
Over fuelling? And sluggish power? High mileage micra
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<blockquote data-quote="pollyp" data-source="post: 679045" data-attributes="member: 4527"><p>before diving into the engine bay, I usually prefer to first plug the laptop into the diagnostic plug to check for any stored error codes and monitor all the electronic sensors behavior using software like nissan datascan or ecutalk, some are free online. any codes and/or abnormal readings would help point you in the right direction to check rather than guessing n waste time.</p><p></p><p>without a consult diagnostic cable, you can enable the onboard ecu diagnostic mode on some k11 by shorting the two lower left diagnostic port pins with a paperclip for 2 sec during IGN (facelift ports will be upside down so it's very important to preferably check with haynes). the long & short engine light pulses shows the codes. running the engine straight afterwards will enable O2 sensor status (on = lean, off = rich).</p><p></p><p>let's go through the engines system to check why it's under-performing.</p><p></p><p>Throttle Body:</p><p>I've deleted r-regs TB fast idle waxstat cos they very commonly seize up n cause running issues. I removed the fault, thoroughly cleaned & calibrated the IACV, checked timing, then adjusted the warm idle bleed screw.</p><p>wrote a guide</p><p><a href="http://micra.org.uk/threads/pollymobiles-rebuild.35251/page-19#post-446256" target="_blank">http://micra.org.uk/threads/pollymobiles-rebuild.35251/page-19#post-446256</a></p><p></p><p>Compression:</p><p>check the warm engines compression. they should be all within 1bar of each other and 11-13bars.</p><p>if compression is too low and smokes under acceleration, the rings could be worn, losing combustion pressure/power and forcing oil vapour into the intake via blowby.</p><p></p><p>Ignition:</p><p>wirebrush the white oxide off the dizzy cap electrodes to restore spark strength especially during cold start.</p><p>warm up engine, unplug TPS, adjust idle to 700rpm, hook timing light to HT lead 1, check the strobe on crank pulley is showing 15deg btdc, adjust dizzy angle, reconnect TPS, readjust idle to 700rpm if needed.</p><p></p><p>O2:</p><p>run diagnostic mode, hold warm engine at 2k and monitor the response of the sensor.</p><p>on a laptop or reader, the o2 dial should cycle up/down quickly bout twice a sec.</p><p>with the paperclip trick, the eng light should flash on/off twice a sec.</p><p>if any slower, then it should be replaced.</p><p></p><p>when the sensor is too slow, the mixture will be out of spec.</p><p>if it doesn't respond, the ecu goes to safe-rich mode and wastes fuel n power n fuel wash the bores n prob wreck the cat.</p><p></p><p>Temp sensor:</p><p>single pin sensor under the dizzy is the gauge sensor.</p><p>2 pin sensor is for the ecu.</p><p>remove and check their resistance is within spec in pan of hot water.</p><p>faulty sensor will make the ecu always run in cold-start rich.</p><p></p><p>Thermostat:</p><p>remove and check in a boiling pan of water that it still fully opens above 82c and closed below 82c.</p><p>video</p><p><a href="http://micra.org.uk/threads/pollymobiles-rebuild.35251/page-95#post-633626" target="_blank">http://micra.org.uk/threads/pollymobiles-rebuild.35251/page-95#post-633626</a></p><p></p><p>a thermostat stuck open will never let the engine heat up so it always runs under cold-start rich.</p></blockquote><p></p>
[QUOTE="pollyp, post: 679045, member: 4527"] before diving into the engine bay, I usually prefer to first plug the laptop into the diagnostic plug to check for any stored error codes and monitor all the electronic sensors behavior using software like nissan datascan or ecutalk, some are free online. any codes and/or abnormal readings would help point you in the right direction to check rather than guessing n waste time. without a consult diagnostic cable, you can enable the onboard ecu diagnostic mode on some k11 by shorting the two lower left diagnostic port pins with a paperclip for 2 sec during IGN (facelift ports will be upside down so it's very important to preferably check with haynes). the long & short engine light pulses shows the codes. running the engine straight afterwards will enable O2 sensor status (on = lean, off = rich). let's go through the engines system to check why it's under-performing. Throttle Body: I've deleted r-regs TB fast idle waxstat cos they very commonly seize up n cause running issues. I removed the fault, thoroughly cleaned & calibrated the IACV, checked timing, then adjusted the warm idle bleed screw. wrote a guide [url]http://micra.org.uk/threads/pollymobiles-rebuild.35251/page-19#post-446256[/url] Compression: check the warm engines compression. they should be all within 1bar of each other and 11-13bars. if compression is too low and smokes under acceleration, the rings could be worn, losing combustion pressure/power and forcing oil vapour into the intake via blowby. Ignition: wirebrush the white oxide off the dizzy cap electrodes to restore spark strength especially during cold start. warm up engine, unplug TPS, adjust idle to 700rpm, hook timing light to HT lead 1, check the strobe on crank pulley is showing 15deg btdc, adjust dizzy angle, reconnect TPS, readjust idle to 700rpm if needed. O2: run diagnostic mode, hold warm engine at 2k and monitor the response of the sensor. on a laptop or reader, the o2 dial should cycle up/down quickly bout twice a sec. with the paperclip trick, the eng light should flash on/off twice a sec. if any slower, then it should be replaced. when the sensor is too slow, the mixture will be out of spec. if it doesn't respond, the ecu goes to safe-rich mode and wastes fuel n power n fuel wash the bores n prob wreck the cat. Temp sensor: single pin sensor under the dizzy is the gauge sensor. 2 pin sensor is for the ecu. remove and check their resistance is within spec in pan of hot water. faulty sensor will make the ecu always run in cold-start rich. Thermostat: remove and check in a boiling pan of water that it still fully opens above 82c and closed below 82c. video [url]http://micra.org.uk/threads/pollymobiles-rebuild.35251/page-95#post-633626[/url] a thermostat stuck open will never let the engine heat up so it always runs under cold-start rich. [/QUOTE]
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Over fuelling? And sluggish power? High mileage micra
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