RPM rising and falling on Nissan bluebird fuel and ignition seems ok
1998 Nissan Maxima bluebird?
did not bluebird end in 1994?
ill answers for 1998 USA, if car is a JDM , well that be different
you have idle surge, (aka hunt)
the ECU controls idle at all times.
there are 10 or 2o things that can cause surge.
many tests. are you up for tests and buying tools, or just want a wild guess>?
1: EGR mains stuck open.
2: ISC stick (electric idle valve)
3: TPS switch ,not closed, at idle (that kills idle controls dead
4: lean AFR. and ISC has lost control or makes it hunt.
5: intake air leaks.
6: ECU in limphome. the USA cars (no location stated, bad)
all usa cars have OBD2 this year, ever use a $7 scan tool yet?
CEL stuck on running. never pulled the DTC errors?
ill stop here, there are 10 more. at least.
Can the Ecu be checked before replacing it?
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