High idle, up to 2K

[Sloth50]

Having an issue while stopped at a light or just stopped in general, my rpms rise up to 2k rpm then throws P0507 code. I also have a P0300 and P0316 both random misfire codes. Plugs look fine and pcv valve is new. Any ideas on where I should look into to find the fix. TIA

2015 GT, 6spd, 18 ported manifold, 47 lbs injectors and running E85

Yes I have checked other post about similar issues. Also, when I put it in gear and ease off the clutch while holding the brake, rpms come back down to normal (roughly 750rpm)

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[TonyT930]

Having an issue while stopped at a light or just stopped in general, my rpms rise up to 2k rpm then throws P0507 code. I also have a P0300 and P0316 both random misfire codes. Plugs look fine and pcv valve is new. Any ideas on where I should look into to find the fix. TIA

2015 GT, 6spd, 18 ported manifold, 47 lbs injectors and running E85

Yes I have checked other post about similar issues. Also, when I put it in gear and ease off the clutch while holding the brake, rpms come back down to normal (roughly 750rpm)

Could it be a mass air sensor in the intake?

 

[Sloth50]

Could it be a mass air sensor in the intake?

I’ve removed that and sprayed it.

 

[TonyT930]

I’ve removed that and sprayed it.

By chance, do you have an air filter oil element and just cleaned and recharged it recently?

 

[Sloth50]

New JLT intake and filter. I will give it a clean but I haven’t put many miles on it by any means!

 

[TonyT930]

New JLT intake and filter. I will give it a clean but I haven’t put many miles on it by any means!

Just please be sure you let the filter dry and don't over oil it. The oil can get on the air sensor resulting in a problem. That's what I was told anyway. Question, is there a chance that the air sensor is installed incorrectly or in reverse? There should be an arrow on the sensor for the direction of air flow I think.

 

[mustangdriver]

Take a look at the throttle body, might need cleaning.

 

[Sloth50]

Take a look at the throttle body, might need cleaning.

Throttle body is cleaned!

 

[Torched10]

New JLT intake and filter. I will give it a clean but I haven’t put many miles on it by any means!

If it were me I'd take out the jlt and see if high rpm goes away just as a test

 

[Pistol_91]

Vacuum leak

 

[Sloth50]

Vacuum leak

Checked and no leak found

 

[Sloth50]

If it were me I'd take out the jlt and see if high rpm goes away just as a test

Wouldn’t I have to change the tune if I went with a stock air box

 

[SheepDog]

What do your fuel trims look like? Also, does your ported manifold have lockouts for the IMRC flaps?

 

[Sloth50]

What do your fuel trims look like?

No idea how to get that info

 

[SheepDog]

No idea how to get that info

What tuning device do you have?

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