I have been having issues with my idle on my 1987 accord lxi FI MT. The PGM-FI light comes on and it throws a code 12. I replaced the EGR valve with a brand new one and no fix on the idle issue, and PGM-FI light still comes on.
Upon start up the RPMs will be around 1500-2000. After the engine is warm idle will go down to 1000 and will slowly work it's way down to 800 then 750 or lower and will almost die. After strugling for about 10 secs RPMs will jump to 1200 then it will repeat the process of dropping slowly to 750 or 700 and bounce back to 1200.
I noticed that when I purchased the vehicle the #16 hose was disconnected , which runs from the EGR to the black box. When i reconnected the hose and drove the car for a couple of days the idle was worse and the engine had a hard time not stalling at stops and when taking off from stops. This led me to believe the EGR was the issue so I replugged the 16 hose until i could replce the EGR which like i stated earlier i did, and after reconnected the hose and test driving the vehicle it still runs with the fluxuating rough idle and PGM-FI light still comes on.
The only thing I can draw from other posts is that it may be the IACV. Should i try cleaning that first. I also tried pinching the PCV hose to see if that would even out th idle and no change occure with the idle after pinching it so no problem with the PCV valve.
Aside from the IACV I'm clueless on the next step to take in determining and fixig the problem, can you guys please help me?!!!
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