P0300 How to check IMRC?

[UglyMutt]

Question: Can you check the condition of the IMRC plates/rod without removing the intake manifold?


Car: 2015 GT with ford PP2 (2000?? miles ago) and a cat back and a catch can.


I’m getting a P0300 code and flashing check engine light after hovering on and off throttle at high RPM. By this I mean that I was running between about 6000-7000 RPM I think in 2nd gear and was kind of on and off throttle a few times in that rev range. This happened to me once last year in a similar situation but I figured it was just bad gas or something because the issue never came back.


This time I was a little more curious on the error so I tried to get it to do it again and same situation, got the same code. Car runs fine otherwise until today. I came to a stoplight and as I stopped, the RPMs dropped to 0 and car died. Restarted fine and made it to work without any issued.


So I’m wondering. Maybe the IMRC plates are sticking or the rod is broken? I thought maybe this was just a bad fuel issue but now I think its something more substantial. Anyone have ideas on what I should take a look at? I’m wondering if there is a way to look at the IMRC without removing the IM? Anything else I can check?

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[2morrow]

OP, here is a helpful video. The comments are somewhat helpful as well.



I have a similar issue with my motor throwing codes for IMRC stuck open which is resulting in misfires.

I have a ported GT-350 IM, TB, CAI, LU47's and tunes by Rob Shoemaker @ PBD. I just clear the codes on the Ngauge as closed IMRC is mostly for low RPM driving.
I have not sensed a loss in power and I have found that the RC shaft is plastic and prone to breaking easily but not too sure how to replace that shaft(s). I was told
to check all the connections as well as vacuum lines for any cracks or issues. I have not found any visible issues with mine so I'm going to drive it around a little more
and see if it continues to happen. I don't think my shaft is broken (yet) as it's not a constant thing, just intermittent.

Have you had any updates or fixes on your end?

 

[UglyMutt]

I haven't had the misfire come back but I haven't been trying to make it happen (hovering on/off throttle around 6500-7200). I was going to wait until I could do some logging to see if that would tell me more about what's happening. Under normal and even aggressive driving I don't get the code. If the rod was broken I would think that code would be more consistent.

 

[Cobra Jet]

This may help you also:

 

[Leroy]

Question: Can you check the condition of the IMRC plates/rod without removing the intake manifold?


Car: 2015 GT with ford PP2 (2000?? miles ago) and a cat back and a catch can.


I’m getting a P0300 code and flashing check engine light after hovering on and off throttle at high RPM. By this I mean that I was running between about 6000-7000 RPM I think in 2nd gear and was kind of on and off throttle a few times in that rev range. This happened to me once last year in a similar situation but I figured it was just bad gas or something because the issue never came back.


This time I was a little more curious on the error so I tried to get it to do it again and same situation, got the same code. Car runs fine otherwise until today. I came to a stoplight and as I stopped, the RPMs dropped to 0 and car died. Restarted fine and made it to work without any issued.


So I’m wondering. Maybe the IMRC plates are sticking or the rod is broken? I thought maybe this was just a bad fuel issue but now I think its something more substantial. Anyone have ideas on what I should take a look at? I’m wondering if there is a way to look at the IMRC without removing the IM? Anything else I can check?

Yes. The Intake Manifold Runner Controls can be checked without intake manifold removal. You will need the Ford IDS to be able to do this with activating IMRC and monitoring fuel controls for both banks. The fuel trim will change (or dip) if the IMRC are operating correctly. If no change is noted or only on one bank you have found the a bad IMRC requiring manifold replacement

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