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Old 04-24-2016, 06:57 PM   #1
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2003 Focus 2.3L PZEV -- Intermittent CEL P2004

This is driving me up the wall. I'm getting an intermittent code P2004.

Sometimes the imrc plunger fails to go down, sometimes it doesn't.

Just when I think everything is good to go, this code creeps back up. I drove the car for ~100 miles, everything seemed to be going great, and then it popped a code at the smog shop.

I've taken and bypassed the solenoid and hooked both vacuum lines together, and the plunger goes down, and if I clamp the line and separate them, it stays down for seemingly indefinitely until I unclamp it. So it seems the solenoid is sometimes doing it's job, and sometimes not. I've tried it on 4 different solenoids now (2 different new ones, and both old ones)

If I start the car, and look under the hood, and the plunger is up, I check obd and have a pending p2004 code, with the car still running and the plunger up, I can unhook the lines, bypass the solenoid by connecting the lines and the plunger instantly goes down, and back up when I separate the lines. Plugging and unplugging the connector does nothing.

I'm going to assume at this point it has something to do with the wiring. I plan to take one of the old solenoids, snap off the connector part and solder wires directly to the leads, and then add a 2 pin connector to replace the factory one.

Could anything else be preventing a signal to the solenoid for whatever reasons? It seems to do it most with the car at full operating temp.


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Old 04-24-2016, 07:24 PM   #2
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FWIW - plugging & unplugging the connector as mentioned when running shuts off the IMRC function until the car is turned off & restarted again. Won't operate it if you do that.

(Learned in testing, only one shot to see power at the solenoid when firing it up by testing at an unplugged connector)

So, AFAIK if it doesn't work initially it won't try again until the next time the car is started.
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Old 04-24-2016, 07:37 PM   #3
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Yep, I've noticed that too by unplugging when everything is normal, and plugging back in will not work again until an engine restart.
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