98' DX idle surge random misfire iacv? ficv?
recently bought older civic 180k,
recent shop tune-up w/timing, belts chged. P0304, but one instance of P0300, 0301, 0302 each too. trying DIY, cleaned IACV... apparently no EGR w/ DX. started fine afterward, for 5-6 min till warmed up... then idle surge... unplugged IACV and it seemed to idle fine... is this simple evidence to replace IACV or should I address 'fast idle valve' somehow before ordering replacement? Any other things to check first? or as well? ( did compression testing... 1912, 170, 185, 180) |
Does the car drive OK other than not idling smooth?
Check that the radiator is full (when cold). Coolant sloshing around in the engine can cause an unsteady idle. |
There's is a noticeable lack of power when the misfiring occurs
after being warmed up... so I'm not driving it until I can fix this and looking for relatively simple DIY checks... The car obviously not worth much but was a great runner at 38-40mpg. Any suggestions much appreciated. |
A while ago, the coolant was low in reservoir and possibly in engine for a bit,
fixed with adding coolant and burping, maybe 3-5k miles before problem occurred. Coolant is full in radiator when cold. |
If it misfires while driving, especially heavy throttle and low rpm, that is usually weak sparks-- and the spark wires are a prime culprit. Some aftermarket wires are really bad and only last a few months.
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followup: 98' DX idle surge random misfire iacv? ficv?
fyi...
put in new iacv -> fixed surging idle, but not misfires... installed OEM spark plug wires (NGK 8034 HE76), (and new spark plugs denso(4504) PK270TT) This fixed misfires/power loss, so car running fine! :-) thanks for replies... appreciated note: there was 30k miles on old plug wires labelled "STI Spark Transfer International" |
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