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Old 03-04-2011, 01:07 PM   #1
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Help please. PCV Valve/Grommets/Hose

Ok, I went to replace the PCV valves/grommets/hoses today...thinking it was about the most simple thing to do...and my Jeep runs like crap.

I was very careful to make sure nothing fell down into the valve cover, so I don't get it.

Check Engine light came on, and flashes, I've never had it flash before, jeep idles very rough, and oil pressure gauge is running a bit high over top center, 40?

The only difference in the parts that I saw, on the pvc valves is one was very open in the bottom, and the other was very closed, almost a pin hole.

The open one was replaced upfront, the one with the small hole was in the back.

Please place upon me your great knowledge oh masters of Jeep maintenance! Thank you.


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Old 03-04-2011, 02:16 PM   #2
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Ok, step one. I got a code reader and now I'm getting worried.

P201 and P301

Cylinder 1 Injector Circuit Malfunction

and

Cylinder 1 Misfiring

Could I have hit a wire or something on the injector to cause this?

I'm gonna go back out there and check what I can check.

I'm still needing some advice please.





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Old 03-04-2011, 02:44 PM   #3
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I went out to see if anything was loose, I wiggled the harness on the first injector and no luck. It runs like crap still. Local repair shop wants $90 to even look at it, about $200 if IF it's the injector.

On a side note, I do have a remote start on, and there is a wire tapped into the first injector, for what reason I do not know. It leads from the injector into the firewall.

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Old 03-04-2011, 03:10 PM   #4
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Your Jeep does not use a PCV Valve. All it has is a small calibrated orifice that pulls fumes from the valve cover into the intake manifold.

If you use non original parts for it the holes in it are too big - making a vacuum leak, setting codes etc.

Wash out the old parts, blow them out to make sure they are clear, and put them back on. Then clear the codes by disconnecting the battery for 2 minutes. Done!

Get any new parts needed from the dealer. I think the whole thing, tubing, elbows and all are about $20. Parts houses will give you the wrong things - like you already have experienced.
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Old 03-04-2011, 03:37 PM   #5
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I'm pretty sure that your looking at the wrong injector. The inline 6 runs from the front to the back 1-6 so I would check the wires at the very front injector, if you can get a noid light to put into the injector harness to see if it is pulsing, if it works then your injector is most likely bad. Also check your spark plug up there, but since it throws the 201 code I would lean more on the injector
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Old 03-04-2011, 03:50 PM   #6
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Quote:
Originally Posted by rrich View Post
Your Jeep does not use a PCV Valve. All it has is a small calibrated orifice that pulls fumes from the valve cover into the intake manifold.

If you use non original parts for it the holes in it are too big - making a vacuum leak, setting codes etc.

Wash out the old parts, blow them out to make sure they are clear, and put them back on. Then clear the codes by disconnecting the battery for 2 minutes. Done!

Get any new parts needed from the dealer. I think the whole thing, tubing, elbows and all are about $20. Parts houses will give you the wrong things - like you already have experienced.

Ok, I didn't know it wasn't a PVC valve, but all the parts are from the dealership and OEM parts. I can't put the old one's back on as when removing them they cracked. (nothing fell down into the valve cover)

All the symptoms feel like a vac leak, but the codes are for the injector and cyl misfire.
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Old 03-04-2011, 03:52 PM   #7
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Quote:
Originally Posted by Hardermods View Post
I'm pretty sure that your looking at the wrong injector. The inline 6 runs from the front to the back 1-6 so I would check the wires at the very front injector, if you can get a noid light to put into the injector harness to see if it is pulsing, if it works then your injector is most likely bad. Also check your spark plug up there, but since it throws the 201 code I would lean more on the injector

I didn't even think of that. I'm about to hit myself. I thought they ran 6 to 1 from the front to the back. Maybe I hit the injector up front while reaching to the back. Thank you. It's a the shop right now, having them look at it. I reached my frustration level quickly today.
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Old 03-04-2011, 04:00 PM   #8
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Make sure the holes you mentioned are identical to the original ones. Remember it's a CALIBRATED leak.

A vacuum leak can set all kinds of codes totally unrelated to a leak. In fact, there is no code for a vacuum leak itself.

Check where the line attaches to the manifold port - there may be a leak there.
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Old 03-04-2011, 04:07 PM   #9
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Quote:
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Make sure the holes you mentioned are identical to the original ones. Remember it's a CALIBRATED leak.

A vacuum leak can set all kinds of codes totally unrelated to a leak. In fact, there is no code for a vacuum leak itself.

Check where the line attaches to the manifold port - there may be a leak there.

Yup, I did that, I was careful to match up the parts exactly. Being as there are two, I only had a fifty fifty shot of getting it right, or wrong.
After the inital rough start up, I went back and made sure everything was pushed on correctly, and then ran the code reader.

Everything fits snug, and I'm positive that I put the two pieces in the correct locations. So I'm assuming that I must have hit the injector harness while reaching over the engine....or it was just coincidence that this happened.

I can't see it throwing the codes it is, if it's a vacuum leak, would it?

P201 and P301
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Old 03-04-2011, 04:08 PM   #10
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And thank you if I haven't yet for the help and suggestions. I think it's past me now, just have to hope the repair shop doesn't take me for a ride.
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Old 03-04-2011, 04:14 PM   #11
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Sorry You got frustrated and took it somewhere. Make sure when you find out What it was to update us as it may help someone down the road.

That's what we are here for after all!
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Old 03-04-2011, 04:57 PM   #12
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Update. Yes, I was incorrect about how the injectors ran. It did turn out to be the #1 injector, the one closest to the grill. The two pins had loosened up that the harness connects to, making the signal intermittent. The shop was able to fix the connection without replacing the injector. Problem solved.

Thank you for the help and support. My jeep is back on the road. Only cost me about $200. Bah....I can't fix everything on my own.

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