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High idle after replacing cylinder one fuel injector

Tiny
LOREN STOVER
  • MEMBER
  • 2003 DODGE INTREPID
  • 2.7L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 234,000 MILES
Car is idling almost at 2,000 RPMs this is after replacing cylinder 1 fuel injector and I have a small evaporative leak and cannot find it. Other than that the car runs great. When I put it in reverse and drive and it's not missing or anything and does not shift hard. It's very smooth going down the road or interstate. It just idles really high in park.
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Saturday, July 24th, 2021 AT 9:04 AM

7 Replies

Tiny
LOREN STOVER
  • MEMBER
  • 130 POSTS
These are the codes I got today it just took a little while after I installed the injector because I had to reset the computer.
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Saturday, July 24th, 2021 AT 6:33 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi,

The two codes are related to two different things. The evap leak (small leak) can be something as simple as a bad fuel cap. Remove the cap and make sure there is no rust or corrosion around the top of the filler neck. If that all looks good and the cap is good, I recommend having the EVAP system smoke tested.

Basically, smoke is injected into the EVAP system at a very low pressure. If there is a leak, the smoke will come out at that point. I suggest this because if there is a crack in a hose or something other that is similar, it will be very difficult to find.

The idea that the EVAP code could cause a "small" vacuum leak could cause an idle issue.

Next, the idle air control performance is related to the high idle. The IAC valve is responsible for maintaining engine idle speed.

I attached the diagnostics for the P0519 below. Let me know if it is something you are comfortable trying. Also, please feel free to let me know if you have questions or need help with something.

Also, here is a link that explains how to service an IAC:

https://www.2carpros.com/articles/idle-air-control-valve-service

Take care,

Joe

See pics below.
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Saturday, July 24th, 2021 AT 8:48 PM
Tiny
LOREN STOVER
  • MEMBER
  • 130 POSTS
I'm not sure I understand what you mean by good trip counter, but when I change the fuel injector I had to take the plenum off. So do you think maybe the plenum gaskets are the root cause for my high idle? As for the EVAP system I can't do a smoke test right now, but when I went to fill the tank at the gas station the neck going to the tank filled so fast that the gas pump shut-off. I'm not sure that would be related to the small leak but it doesn't hurt to ask.
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Wednesday, July 28th, 2021 AT 7:03 AM
Tiny
LOREN STOVER
  • MEMBER
  • 130 POSTS
I sprayed brake parts cleaner underneath the plenum and it change the idle on my car that's after I replaced the plenum gaskets. If I have leaky O-rings on my injectors can that cause high idle or other words can it cause an idle air control valve code?
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Wednesday, July 28th, 2021 AT 5:02 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi,

If you have a leak on one of the o-rings on the injectors, it would be leaking fuel. If the idle changed, it sounds like you have an engine vacuum leak. That would also help explain the EVAP leak.

If there is a leak, and it sounds like there is, you will be getting unmetered air into the combustion chamber. That will cause a lean mixture and the computer to try to compensate. That can cause idle issues.

See if you can locate where the leak is. Note: be careful when spraying parts cleaner on a hot engine. It is flammable.

Let me know if you are able to locate the leak.

Joe
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Wednesday, July 28th, 2021 AT 8:34 PM
Tiny
LOREN STOVER
  • MEMBER
  • 130 POSTS
I located the leak it was the injector O-rings I replaced them with new ones that I had and it's running at 1,000 RPMs in idle and 800 RPMs in drive and reverse and there is no check engine light. Thank you so much for helping me narrow this problem down. If I have anymore I will make sure I ask you guys.
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Thursday, July 29th, 2021 AT 6:01 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi,

Excellent! I'm glad you found the problem and it's running properly. The o-rings are small and easy to damage. I always coat them with Vaseline when installing. It really helps prevent getting then cut or knicked.

Absolutely feel free to come back anytime in the future. You are always welcome here.

Take care of yourself.

Joe
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Thursday, July 29th, 2021 AT 1:35 PM

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