High Idling Honda

[Salman]

Hi,

I have a 2007 honda accord 4 door 4 cylinder.. I recently had my starter motor replaced, and for this car that requires you to take the intake manifold of the front of the engine to gain access. Trust me that’s the only way to get it. My mechanic did this repair as I did not want to mess around with sensitive throttle body and I just dont have that kind of experience. After the repair the car was fine, the next day after I picked it up, I noticed that one the bolts on the air filter box was broken, so I replaced it. ( this was not my mechanic who broke it , it was an oil change place i took it too 2 days before the starter went).

I realized that air was being drawn in from above the filter because of the broken bolt, so I decided to clean the mass air flow sensor in case it got dirty. looking back now I should have just left it, but i cleaned it about a year ago and no issues so I didn’t see any harm in doing so. I took it out, only 2 screws holding it in, sprayed it with mass flow sensor cleaner, about 15 very short sprays from a distance, then let it dry for 30 minutes, put everything back together and when I started the engine, the engine check light was on, and the idle is high, about 1500 when the engine is at operation temp in park. the code reads:
P0507- idle control system RPM hight than expected.

also had another code, but that one doesnt show up anymore: P0102 mass or volume air flow circuit low imput.

If anyone know what i can do or what could be the problem please let me know. Also I herd that when the intake system is apart you have to do an idle relean procedure. I have done it 3 times now, each time the engine like stays on and idle remains high.

thanks.

Topic

[gabe collins]

How high is your idle?

[Sean]

[quote=”salm939″ post=157852]Hi,

I have a 2007 honda accord 4 door 4 cylinder.. I recently had my starter motor replaced, and for this car that requires you to take the intake manifold of the front of the engine to gain access. Trust me that’s the only way to get it. My mechanic did this repair as I did not want to mess around with sensitive throttle body and I just dont have that kind of experience. After the repair the car was fine, the next day after I picked it up, I noticed that one the bolts on the air filter box was broken, so I replaced it. ( this was not my mechanic who broke it , it was an oil change place i took it too 2 days before the starter went).

I realized that air was being drawn in from above the filter because of the broken bolt, so I decided to clean the mass air flow sensor in case it got dirty. looking back now I should have just left it, but i cleaned it about a year ago and no issues so I didn’t see any harm in doing so. I took it out, only 2 screws holding it in, sprayed it with mass flow sensor cleaner, about 15 very short sprays from a distance, then let it dry for 30 minutes, put everything back together and when I started the engine, the engine check light was on, and the idle is high, about 1500 when the engine is at operation temp in park. the code reads:
P0507- idle control system RPM hight than expected.

also had another code, but that one doesnt show up anymore: P0102 mass or volume air flow circuit low imput.

If anyone know what i can do or what could be the problem please let me know. Also I herd that when the intake system is apart you have to do an idle relean procedure. I have done it 3 times now, each time the engine like stays on and idle remains high.

thanks.[/quote]

Well the last thing you messed with was the MAF sensor, and both the codes point to the MAF, so maybe do a voltage test on the MAF sensor.
Hold the engine at 4k RPM, and test the MAF’s output voltage (leave it connected, just back-probe it) it should be 4 volts.

[Salman]

1500 RPM when the engine is warm at operating temp, and in park. about 1050 to 1100 when stopped in park.

[EricTheCarGuy]

You don’t necessarily need to remove the intake to get to the starter. You can access it from underneath and to the side. That’s moot at this point though.

Given that you just did all that work and removed the intake, I say you should go back in and recheck all that work. Especially the intake gasket. Come to think of it, you could check for vacuum leaks before you tear into it again.

You can use water instead of carburetor cleaner if you feel more comfortable using that.

Also check to make sure everything is plugged in correctly and no wires or vacuum lines were damaged. Any of these things could cause the problem you’re having.

More info on idle problems here.

http://www.ericthecarguy.com/faq/solving-automotive-idle-problems

Please keep us updated on what you find.

[Salman]

Thanks eric, I will go hunting for vacuum leaks this weekend.

[Salman]

Ok so I went looking for vacuum leaks and actually found one under the left passenger side of the intake manifold where is connects to the engine, possible leaks are from the intake gasket that may have not seated correctly, or from the pcv system under the manifold( hope its not that).

Thanks for your help guys, I now have to remove the intake manifold and figure out if it is the gasket or if its something else, at least I now know that it is indeed a vacuum leak causing this idle issue and I can now procced to fix it.

[Author]

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