Rev counter read­ing

Car Mechanics (UK) - - Help! -

I have a 1995 Nis­san Almera 1600 GX auto petrol with en­gine GA16 DE. It has 73,000 miles on the clock. About a week ago, I was in heavy traf­fic and needed to get over to the right to take a right-hand turn at the next lights. I in­di­cated right and floored the throt­tle, pulling into a gap. I glanced at the rev counter and the nee­dle was up against the max­i­mum stop. By then, I had feath­ered the throt­tle as I had all the speed I needed, the kick­down had op­er­ated as per usual and ev­ery­thing ex­cept the rev counter was fine. I got held at the lights and the nee­dle stayed at the top no mat­ter the throt­tle po­si­tion and it was still stuck there when I re­turned home.

The fol­low­ing day, the rev counter went wild for the first mile or two, then it started to re­late to the throt­tle po­si­tion and over the next half-hour op­er­ated nor­mally. Since then, on most days it al­ways starts off wild and later calms down. I am sure that the nee­dle re­sponds to the throt­tle po­si­tion as it calms down, which led me to think in­let track de­pres­sion was in­volved as the re­sponse of the nee­dle to throt­tle is in­stan­ta­neous. How­ever, as it im­proves, one re­alises that it is the RPM con­trol­ling the nee­dle. What­ever the rev counter says, the en­gine al­ways re­sponds flaw­lessly to throt­tle. Ken Wilkin­son The op­er­a­tion of the ve­hi­cle rev counter is elec­tronic and driven by the in­for­ma­tion re­ceived from the ECU. Given that the en­gine per­forms cor­rectly and the throt­tle re­sponse is good, the fault is most likely in the gauge it­self. This is a known prob­lem with the Almera rev counter and some own­ers have been suc­cess­ful in fix­ing it by re­mov­ing the dash, strip­ping out the rev counter and resol­der­ing the joints. This will take just a short touch with a hot sol­der­ing iron on each vis­i­ble joint on the cir­cuit board and will rec­tify the prob­lem if it is due to a dry or cracked sol­der joint.

Be­fore try­ing this, how­ever, I would first check and en­sure the con­nect­ing plugs are mak­ing a good con­tact with the dash and that none of the plugs are loose. A poor con­nec­tion or bad earth may be to blame for the fault.

If the prob­lem is more se­vere, a re­place­ment rev counter will be needed.

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