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Peter Bagley
Peter Bagley, Toyota mastertech
Category: Honda
Satisfied Customers: 447
Experience:  master tech at Toyota dealer
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I have a 1991 acura Integra. I have have a code 14 on the

Customer Question

I have a 1991 acura Integra. I have have a code 14 on the ECU. I replace the idle control valve but I still have an engine check light on and a code 14. Car runs good.
JA: Does the light stay on, or does it blink?
Customer: One long blink and then four short blinks
JA: What is the model of your '91 Acura?
Customer: Ls
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: Yes, I replaced the b18a engine with a b18b engine. I changed over all the original parts including intake, exhaust, wire harness and all excessories
JA: Anything else you want the mechanic to know before I connect you?
Customer: That it, the engine runs great but I can't get rid of the engine check light
Submitted: 5 months ago.
Category: Honda
Expert:  Peter Bagley replied 5 months ago.

Hello and welcome to just answer and allowing me to assist you. I have two separate diagnostic trouble codes for #14.

(P1508) Idle Air Control Valve Circuit Failure
Probable causes
*IAC valve
*IAC valve circuit
*ECU

(P0505) Idle Control System Malfunction

Probable causes
*IAC valve mechanical malfunction
*Fast Idle thermo valve malfunction (A/T)
*Throttle body clogged port, improper adjustment
*Intake manifold, gasket leakage
*Vacuum hoses leakage
*Engine Coolant Temperature sensor incorrect output
*Throttle Position sensor incorrect output

I assume you don't have a scantool so here's some other troubleshooting tips.

Check the engine speed at idle with no load conditions: (headlights, blower fan, rear defogger, radiator fan, and air conditioning are not operating.)

Is it 750 plus or minus 50 rpm or is it around 550 rpm? (B18B)If it's 750 plus or minus 50 then it's an intermittent failure. Reset the ECU if this is the case.

Another thing you could try is to disconnect the 2P connector from the IAC valve. Does the engine speed drop or the engine stall? If not replace the IAC valve. See if you can clean the ports in the throttle body. hope this helps your situation.