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Thread: IACV Problems
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Old 04-15-2018, 10:53 AM
Malo 809 Malo 809 is offline
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IACV Problems

Hi All, I just purchased a 1998 Honda Accord LX Coupe with a 2.3L 4 Cyl 5 speed manual transmission at an auction. The car has 159K miles on it. This will be my daily for the foreseeable future so I need to get this thing in good running condition ASAP. Iíve fixed a bunch of problems already but I have one main problem I canít seem to fix.

The car had a bunch of codes all of which have been cleared except for this P1519 IACV Circuit Failure code. Along with the code I have a fluctuating idle between 1200-1400 RPM, assuming the two are related once this is fixed I should be good to go. (Side note at idle exhaust really stinks which I believe means Iím running lean which I also believe could be tied to this IACV problem because the AF ratio is off). After some quick research I came across this site with some troubleshooting steps.

Initially I tested the circuit and had a good solid ground connection on pin 3, steady battery voltage on pin 2 and 6-7 volts on pin 1, all checking out right? So I move to the valve. I removed it from the car and checked the resistance as per the troubleshooting steps. The Ohm readings were way out of range, so bad part right? I run to the local parts store and $160 later Iím back with a new part, I check the Ohm readings as per the troubleshooting steps and bam 10 OHMs on the nose so all should be good. I install the part hook up my coolant lines test everything, top off my coolant and crank the motor. The code is still on and he motor still has a fluctuating idle. So I go back under the hood, pull the connector and test voltage again. All the numbers are still adding up. What else can I try? Iím starting a new job tomorrow and itís a 40 mile commute, I would really love to have the car running in good condition before then.
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