GEE-OTTO Posted September 19, 2012 Share Posted September 19, 2012 Car: 2008 Legacy 2.5i 5MT Issue: When in traffic lately, and I push in the clutch the RPM jump up to 1500 and then rise to about 1850 then drop to 950 then rise up again to 1500. If I coast in neutral with my foot off the clutch this does not occur only when in gear and the clutch pressed in. While this is occurring (the high idle) if I knock it out of gear and let my foot off the clutch it will return to normal idle. Causes: IACV? TB malfunction? Vacuum ? Im not sure where to start b/c i dont have any CELs. Regularly maintained (oil every 4K, air filter every 8K, plugs every 20K) If you have insight to this problem please let me know Link to comment Share on other sites More sharing options...
InnocentGuns Posted September 19, 2012 Share Posted September 19, 2012 Does this car have rev matching for upshift? my buddys altima did that if he didnt push the clutch in all of the way. car thought he was releasing the clutch saw rpms low and increased them. not sure if that could be the problem but worth trying to rule it out. Link to comment Share on other sites More sharing options...
whitetiger Posted September 19, 2012 Share Posted September 19, 2012 is the AC on when this is happening? Link to comment Share on other sites More sharing options...
GEE-OTTO Posted September 20, 2012 Author Share Posted September 20, 2012 is the AC on when this is happening? No AC, and there is a rev match for upshifts. I was thinking about this feature as the culprit. I think the ECU or the TCU thinks it needs to hold or raise the RPM. Could be the clutch switch in the pedal assembly ? Link to comment Share on other sites More sharing options...
GEE-OTTO Posted September 21, 2012 Author Share Posted September 21, 2012 Could temp cause this problem ?> Link to comment Share on other sites More sharing options...
apexjapan Posted September 21, 2012 Share Posted September 21, 2012 Check the spark plugs/spark plug leads. A loose one at the spark plug end will cause some erratic idle issues, and ECU will try to compensate. Won't trigger a CEL either. If a lead *is* loose, check the spark plug itself to make sure it's in snug. Otherwise, it's most likely a vacuum leak. There's a lot of minor things that can happen that won't trigger a CEL on the 2.5i's, they are not that finicky about them. Regards, Paul Hansen http://www.avoturboworld.com/avoshop http://www.facebook.com/avoturboworld Link to comment Share on other sites More sharing options...
GEE-OTTO Posted September 21, 2012 Author Share Posted September 21, 2012 Check the spark plugs/spark plug leads. A loose one at the spark plug end will cause some erratic idle issues, and ECU will try to compensate. Won't trigger a CEL either. If a lead *is* loose, check the spark plug itself to make sure it's in snug. Otherwise, it's most likely a vacuum leak. There's a lot of minor things that can happen that won't trigger a CEL on the 2.5i's, they are not that finicky about them. Regards, Paul Hansen http://www.avoturboworld.com/avoshop http://www.facebook.com/avoturboworld Yeah it is almost time for a plug change anyhow so ill do them this weekend. As far as vacuum, should i check all the lines on the IM ? Link to comment Share on other sites More sharing options...
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