1998 V70 GLT surging idle
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1998 V70 GLT surging idle
I have a 1998 V70 GLT with 277k miles. The engine runs great and has 180 psi compression in all cylinders. It has a problem of the idle surging severely when completely warm. When starting cold with the check engine light cleared and the IAC plugged in it runs fine and all the OBD parameters are in range. When it gets to a certain temperature it sets a check engine and the idle surges severely and goes to open loop. If I disconnect the IAC it goes back to closed loop and runs fine except for a high idle. I’ve seen this exact problem described on the web with this year and model but no one seems to have a clear answer to fix it. I have tried a different IAC, ECU and crank angle sensor. I have recently replaced the MAF, thermostat, coolant temp sensor and radiator. The coolant temp sensor was bad and reading about 20 deg. F too high but replacing did not fix the problem. Any help would be appreciated.
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