High idle sometimes it idles high then low sorta pulsing.
somtimes if I turn the heater to defrost it idle up to 4000 rpm but as soon as I take it off defrost it goes back down
replaced the computer 1 year ago
engine codes p1133 p0171 p0507 p0131 all at once
Per your description, it sounds like you have a vacuum leak.
Check all vacuum hoses at the engine, make sure no hoses are disconnected, cracked or damaged.
Disconnect each hose at the source on the engine and see if the engine idle stabilizes.
Let me know what you find and we can go from there.
Regards.
The P01133, 0171 and 0131 are indicating a lean fuel mixture. This can be caused by a number of things.Air leaks in intake manifold, exhaust pipes or exhaust manifold
Fuel control sensor is out of calibration (ECT, IAT or MAP)
Low fuel pressure (fuel filter clogged, pressure regulator failure)
One or more injectors restricted or pressure regulator has failed
HO2S element is contaminated, deteriorated or has failed
Vacuum hose is disconnected, broken, leaking or loose
Engine misfire condition present (look for P0300 series codes)
Now because your problem is intermittent, the next "no cost" check will be to remove the IAC (idle air control) motor and clean it. If the IAC is sticking, it can cause the same problem.
Also, did you disconnect the brake vacuum booster hose at the engine and plug it to see if engine normalizes?
Clean the IAC and throttle body bore and let me know.
Good luck and let me know.
Regards,
Has the high idle stopped and is the P0171 code the only code now?
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where can find a diagram of the hoses
I checked the vacuum lines they all look good 3 of the 4 codes point to a O2 sensor Also the problem is intermittent it doesn’t happen all of the time also the trac light is on along with the check engine light
I cleaned it all and changed the fuel filter still get p0171
ok I changed the fuel filter and the O2 upstream sensor and that fixed it
P0507
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