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tach off by 400rpm?

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    #1

    tach off by 400rpm?

    I've done some searching with very little satisfactory results. My issue is, without verification, that my tach is of by 400 rpms or so. At warm idle it reads 1150. To my ears and body, it sounds and feels like 750 or optimal range at least. What ways can I verify this. I can deal with the tach being off as long as I know it's actually true.
    Tags: None
    #2
    What year and model Accord? Auto or 5 speed? Did it happen suddenly, or gradually shift over time? Do you think it is shifted (400 high all the time), or is it even more off at higher engine speeds?
    90 LX 4dr 5 spd 396,014 (sold 1/1/2022) - MRT: http://www.cb7tuner.com/vbb/showthread.php?t=201450
    08 Element LX FWD AT 229,000 - MRT: fleetw00d : 2008 Honda Element LX - CB7Tuner Forums

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      #3
      It's a 93 ex automatic. I bought it last year and it's been like that since then. This was the least of my worries and repairs, but all the other things before have been taken care of. I'm not really sure if it carries thru evenly all the way up the rpm but I imagine it does.

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        #4
        What happens if you disconnect the IACV? Find a deserted road. Put the gear selector in 1; let the engine idle at the 1150 rpm and see what speed the car attains (level ground). Same thing for second - for both gears, accelerate above the 1150 rpm, then let it settle back to 1150; note the speed it maintains. Running stock size (195-60/15) tires? With this info, we can estimate the engine speed.
        90 LX 4dr 5 spd 396,014 (sold 1/1/2022) - MRT: http://www.cb7tuner.com/vbb/showthread.php?t=201450
        08 Element LX FWD AT 229,000 - MRT: fleetw00d : 2008 Honda Element LX - CB7Tuner Forums

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          #5
          To troubleshoot properly, you’ll need to try swapping in known-good components: distributor, ECU, and gauge cluster. Of course, that can get expensive and time consuming.






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