Mechanics

HONDA ACCORD SENSOR PROBLEM

1999 Honda Accord

Shakes or Wobbles problem
1999 Honda Accord Front Wheel Drive Manual 13000 miles

I GOTCELl WHILE DRIVING, CEL was blinking.
Checked code in Pepbous on my way home=code P0131 and misfire in cyl.1.
At home cleared codes and started car -from cold.
Run normally while cold, when hotCEL come on again and blinking; vibration on idle. Disconnecting injector 1 do not change idle; disconecting of any other do change idle.
Replace distributor cap and rotor, cheked ignition plugs, cheked that ignition is present on cyl 1(connect cable to spare ignition plug in air and see the sparks). Replaced injector on cyl.1. Replaced oxygen sensor 1.
No help: when engine get to normal working temperature CEL goes on and blinking and vibrations starts. Checked signals from computer to injector with voltmeter -do not see difference between signals on different cylinders. Still do not see changers in idle when disconnect injector on 1-st cyl.
Checked voltages on oxygen sensor- heating is present (12-13 V), signal indeed goes low on idle when engine is hot.
Tried to clean idle valve with manifold cleaning liquid, but without disassembling (pour liquid in)- no help so fare. Looks like problem only on idle. Possibly idle speed is a bit low, but hard to tell(what it should be?)
Avatar
Persev
July 23, 2010.




Hi persev,

P0131 = Primary HO2S (Sensor 1) circuit low voltage.

What is the idling speed?

KHLow2008
Jul 24, 2010.


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