Why is my car idling high

Asked by Derrick Oct 10, 2023 at 05:41 PM about the 1997 Mercury Grand Marquis 4 Dr LS Sedan

Question type: Maintenance & Repair

I have code p1506 it's idling high at 1050 rpms, I have
cleaned maf sensor, replaced tps sensor,egr valve,iac
valve, cleaned throttle body, nothing is helping it runs
fine its just getting horrible gas milage like 10 mpg
city I also replaced fuel pump and filter I checked for
vacumn leaks and there was none, I also unplugged
egr while running and there was no difference in idle
and help would be appreciated

3 Answers
307,265

Gene answered 6 months ago

Leaking fuel injectors, leaking fuel pressure regulator(very common), internal engine vacuum leak, misadjusted minimum air rate, basic engine problem worn rings, compression low, timing chain slop, tune up.

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202,485

Ed92626 answered 6 months ago

Very common result of a faulty Idle Air Control Valve. Just replace the valve, it takes about thirty minutes. Based on what you're doing, you're cheapening on maintenance, and should stop that. What you'd have spent on a mechanic could have saved you the added expenses of parts and a lot of worry... I know how expensive Martinis can be.

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307,265

Gene answered 6 months ago

Forgot to mention: Beware aftermarket sensors and controls motors. Only use Factory replacement if possible.

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