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Thread: HOW TO: IMRC Removal and Repair Reply to Thread
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Topic Review (Newest First)
Today 03:24 AM
mike1986
Quote:
Originally Posted by Sniper Focus View Post
Not quite...

Ford Focus SVT Powertrain Specifications


(I was told my car has the latest factory tune and it activates at 5,000 rpm, while some do it at 6,000. I think the aftermarket tuner guy(s) sets it at 5,000 as well.)

Engine off = IMRC is free and the manifold is in short runner mode.

Idle through 5K or 6K rpm = IMRC is pulling the cable for long runner mode.

Above 5K or 6K rpm = IMRC lets go for warp speed power (short runner mode.)
Thanks for the great explanation, but my concern was more about the question if there should be a difference in the manifold mode between (1) engine off + ignition off and (2) engine off + ignition on.
Today 12:45 AM
Sniper Focus I heard somewhere they're in regular V6 Contours and "new" Cougars, and they're the same but the cable is a little longer. I've been meaning to check for myself before those cars dry up in junkyards.
Yesterday 11:08 PM
sailor Don't know about parts availability on the cable, keep an eye out for an SVT Contour for another that uses the IMRC controller.
Yesterday 10:27 PM
reddy1 Ok so I got my new lever on and hooked everything up and it didnt work so I took apart my imrc to clean off the connection then I thought I should probably look at the rest of my imrc. Part of the plastic thing that the wire sits in ( why on earth was there a plastic piece at both ends of this wire screw mexico) and pulls the wire is broke I inagine I cant get just this part so what is the list of cars that had the same imrc? Gotta trybto find one at a junk yard before friday. Thanks (oregon)
Yesterday 05:23 PM
Sniper Focus Not quite...

Ford Focus SVT Powertrain Specifications
Quote:
The other significant contributor to low-speed torque is the SVT Focus dual-stage intake manifold, the first application of this technology at Ford. This device is designed to direct the intake air through four long runners below 6,000 rpm. Above 6,000 rpm, the manifold switches position to shorten the runners length, which improves peak power output.
(I was told my car has the latest factory tune and it activates at 5,000 rpm, while some do it at 6,000. I think the aftermarket tuner guy(s) sets it at 5,000 as well.)

Engine off = IMRC is free and the manifold is in short runner mode.

Idle through 5K or 6K rpm = IMRC is pulling the cable for long runner mode.

Above 5K or 6K rpm = IMRC lets go for warp speed power (short runner mode.)
Yesterday 04:50 PM
mike1986
Quote:
Originally Posted by Sniper Focus View Post
No, the intake needs to be completely at rest when the engine is off. This is supposed to work strictly as an OPEN or CLOSED system with no stages in between. At least it looks like you've found your problem. You'll probably get performance back in the upper RPM range when the IMRC drops the lever back down to "engine off" status.
Ok I want to make sure I understand the situation.

Previously I was told by a friend that this "little open" position at "engine off" is normal, that after starting the ignition (but not the engine) the line should be automatically released from the strained position and the intake valves should be closed.

That means that I was told the following scheme:

1. Engine off + ignition off = IMRC line is strained and intake valves are about 5-10% open

2. Engine off + ignition on = IMRC line is released and intake valves are closed.

3. Engine on = the IMRC is closing/opening intake valves, depending on the RPM.

Now what you told me is:

1. Engine off + ignition off = IMRC line is free and intake valves are closed.

2. Engine off + ignition on = IMRC line is free and intake valves are closed.

3. Engine on = the IMRC is closing/opening intake valves, depending on the RPM.



Is this correct?
Yesterday 01:36 PM
Sniper Focus
Quote:
Originally Posted by mike1986 View Post
Thanks for the replay. Yes, my lever was broken once and it's fixed with a screw. But I noticed that the "engine off" status of the line is a little bit strained, pulling the lever a little bit and keeping the valves in about ~10% open position. Is this correct? Or the valves should be completely closed when the engine is off?
No, the intake needs to be completely at rest when the engine is off. This is supposed to work strictly as an OPEN or CLOSED system with no stages in between. At least it looks like you've found your problem. You'll probably get performance back in the upper RPM range when the IMRC drops the lever back down to "engine off" status.
Yesterday 08:04 AM
mike1986
Quote:
Originally Posted by Sniper Focus View Post
I don't have any real ideas, some slight corrosion on the main contact made my car act like that this year, I cleaned it and the code went away. Or maybe some one replaced the lever and it's in a wrong orientation...

The reason if the "lever breaks and no code" is because the position sensor is in the IMRC box. As long as the box is working it wont throw any codes, even if it's hooked up to anything or not.
Thanks for the replay. Yes, my lever was broken once and it's fixed with a screw. But I noticed that the "engine off" status of the line is a little bit strained, pulling the lever a little bit and keeping the valves in about ~10% open position. Is this correct? Or the valves should be completely closed when the engine is off?
05-24-2015 09:08 PM
Sniper Focus
Quote:
Originally Posted by mike1986 View Post
Hey everyone, I own Ford Focus ST170 (2003) and since a long time I am facing IMRC problem too. The only code that comes up is P1518. I already tied a few attempts to fix it, no luck so far.

1. Firstly I replaced one of the famous transistor inside the IMRC. No problem for about a month, then P1518 came back. At the beginning the check engine light was coming back every few days. 2 days - no problem, then again check engine light for next 3 days. And again and again. What I'm trying to say is that the issue wasn't permanent.

After few more months the check engine light stayed and never went back. After removing the error code it comes back always after about 50km or 3rd engine start.

2. So I sent my IMRC for a regeneration. A lot of parts inside were changed for new ones. Regenerated IMRC was tested on the other vehicle and everything was fine. But after placing it in my car the check engine came again. So basically no difference.

3. Then I asked electrician to check the wires. He checked all IMRC cables, including the signal cable that goes to the driver. Everything is fine.

So...

* IMRC is fine
* Cables are fine too

What else can be wrong? Broken lever? Something else? I've seen an opinion somewhere that "If it's throwing a code it's a bad IMRC, if the lever breaks you don't get a code". That confused me a lot.

Any opinions/solutions? Thanks in advance!
I don't have any real ideas, some slight corrosion on the main contact made my car act like that this year, I cleaned it and the code went away. Or maybe some one replaced the lever and it's in a wrong orientation...

The reason if the "lever breaks and no code" is because the position sensor is in the IMRC box. As long as the box is working it wont throw any codes, even if it's hooked up to anything or not.
05-24-2015 08:46 PM
Sniper Focus
Quote:
Originally Posted by reddy1 View Post
Awesome thanks sniper! So I kinda assumed it was broken/ hoped because I didnt want to open up the actual irmc. So I actually got a billet one from cfm can you give me pointers on how to take the old one off and where the wire attaches to the new one is the plastic do-hicky what I put in the lever or?
There's even a link for a "how to" in post #2.
http://www.focusfanatics.com/forum/g...lp-please.html

It's been a while since I've done, I remember the annoying part of having to "hammer" it on in a limited space. Tapping on it cuts new splines in the lever. Also shifting into a certain gear moves the shifter linkage out of the way for more working room in that area.
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