Question about 1990 Honda Accord
The pvc valve will always let some oil out into the intake to burn. That's normal. Now for the misfire at 2000 rpms, I believe you will have to clean out the EGR passages on your intake system. Basically, three of the four individual EGR passages are blocked up and when the EGR opens, it floods only one cylinder with exhaust gas, causing an extremely lean condition and misfire. It's not an easy task to do on that year Accord, but I think it's what's causing the misfire at high rpms, when the EGR valve opens.
Posted on Jan 04, 2011
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Posted on Jan 02, 2017
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Dec 01, 2013 | 1990 Honda Accord
Here are the most common causes of idle surge, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake
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