What causes the engine to have surges when idle
Hot engine or cold, or both???????????????????
surging or hunting idle is complex but for sure the ECU has lost control of idle speed , there are 2 macro reasons, (vast causes)
1: ISC is stuck (in non SAE terms, the idle speed control valve ) is stuck.
2: engine is missing cause the ISC to GO NUTS trying to control
idle and can not.. the 50 reasons, , have list ask.
we do tests to find out if either or both the above are bad.
do you want tests, or guessing>???
SOURCE: 1999 Honda Civic 4 Door 80000 miles
Hi,
To my knowledge, the PCV valve for a 1999 Honda Civic fits into a socket on the block and a tube leads from a nipple on the PCV valve to the intake manifold. As posted here, "Chiltons repair manual ... says on the passenger side near the top of the crank case leading to the air intake. In other words open your hood look down where it says "HONDA" right above the spark plug wires come out and to the distributor cap. Look at the letter "H" then look above the about 1.5 inches then left about 4-5 inches you will see a black hose with a clamp on it curving to the right to a smaller metal tube leading to the black box about (8-9 inches) where your air filter goes to. That's where it's >suppose< to be,up top near the letter "H"."
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards.
Thank you for using FixYa.
SOURCE: I have a 91' honda civic hatchback and it starts idle surging.
Check and make sure your coolant level is up. If it's up, your idle air control valve is faulty or your cold start solenoid isn't working anymore. Both are activated by the engine water temp.
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