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Another pcv valve question, 4.7L #198544 01/19/09 10:29 PM 01/19/09 10:29 PM
Joined: Jan 2003 Posts: 1,443 7 70duster340 OP pro stock
70duster340 OP pro stock 7 Joined: Jan 2003 Posts: 1,443	Can a faulty pcv valve effect driveability and idle quality, or just one or the other? This is on a 2007 Dodge Dakota Quad Cab 4X4. The performance seems to be fine as far as driveability goes, but recently the idle has been a bit more rough than previously. I have replaced the plugs, which seemed to help somewhat. However, it still idles a bit rough. Thanks in advance

Re: Another pcv valve question, 4.7L [Re: 70duster340] #198545 01/20/09 12:55 AM 01/20/09 12:55 AM
Joined: Jan 2003 Posts: 1,443 7 70duster340 OP pro stock
70duster340 OP pro stock 7 Joined: Jan 2003 Posts: 1,443	Anybody???

Re: Another pcv valve question, 4.7L [Re: 70duster340] #198546 01/20/09 10:56 AM 01/20/09 10:56 AM
Joined: Jan 2003 Posts: 2,936 Richmond, VA VT_Dart master
VT_Dart master Joined: Jan 2003 Posts: 2,936 Richmond, VA	My wife's 4.7 has a bit of an erratic idle. It was getting really bad and replacing the TPS corrected the situation, but the idle still isn't completely smooth. PCV valve didn't remedy it either. My dad's 4.7 in his Dakota ('02) has a slightly detectable change in idle too, and has since new, so I'm wondering if it's just normal for the vehicle. Darrah Heath

Re: Another pcv valve question, 4.7L [Re: VT_Dart] #198547 01/20/09 01:10 PM 01/20/09 01:10 PM
Joined: Jan 2003 Posts: 1,443 7 70duster340 OP pro stock
70duster340 OP pro stock 7 Joined: Jan 2003 Posts: 1,443	Thanks for the post VT Dart. Maybe you are correct about it being something usual for this engine. But, it has almost stalled in the past few weeks, and it seems like the idle situation just came on sort of suddenly. If it were a TPS problem, would it show a trouble code? That sounds like it may be the problem.

Re: Another pcv valve question, 4.7L [Re: 70duster340] #198548 01/20/09 02:19 PM 01/20/09 02:19 PM
Joined: Oct 2004 Posts: 214 M moparmandc enthusiast
moparmandc enthusiast M Joined: Oct 2004 Posts: 214	the ones that i have seen replacing the tps usually fixes it but you might try cleaning the throttle body also hope this helps. also have seen the pcv freezing up on these 4.7s lately not sure where you are from but changing it might not be a bad idea or at least cleaning it cause it does get a lot of moisture.

Re: Another pcv valve question, 4.7L [Re: moparmandc] #198549 01/20/09 02:39 PM 01/20/09 02:39 PM
Joined: Jan 2003 Posts: 2,936 Richmond, VA VT_Dart master
VT_Dart master Joined: Jan 2003 Posts: 2,936 Richmond, VA	Quote: the ones that i have seen replacing the tps usually fixes it but you might try cleaning the throttle body also hope this helps. also have seen the pcv freezing up on these 4.7s lately not sure where you are from but changing it might not be a bad idea or at least cleaning it cause it does get a lot of moisture. Good call. I also took off the throttle body and did a thorough cleaning when I replaced the TPS, just forgot to mention that.

Re: Another pcv valve question, 4.7L [Re: VT_Dart] #198550 01/20/09 04:47 PM 01/20/09 04:47 PM
Joined: Jan 2003 Posts: 1,443 7 70duster340 OP pro stock
70duster340 OP pro stock 7 Joined: Jan 2003 Posts: 1,443	Right now I am just trying to get the sensor off. I can't get the screws to break loose. Maybe if I run the engine up to operating temperature, it may help with those pesky screws? Cleaning the throttle body is a good idea, as well. However, here in Ohio it's only 20 degrees today. That's higher than it has been in at least a week!!!

Re: Another pcv valve question, 4.7L [Re: 70duster340] #198551 01/20/09 04:53 PM 01/20/09 04:53 PM
Joined: Jan 2003 Posts: 2,936 Richmond, VA VT_Dart master
VT_Dart master Joined: Jan 2003 Posts: 2,936 Richmond, VA	Quote: Right now I am just trying to get the sensor off. I can't get the screws to break loose. Maybe if I run the engine up to operating temperature, it may help with those pesky screws? Cleaning the throttle body is a good idea, as well. However, here in Ohio it's only 20 degrees today. That's higher than it has been in at least a week!!! Trouble on the TPS screws? Mine came right out, but maybe they're easier to get to on the Grand Cherokee than the Dakota. If it's anything like the GC, taking the throttle body off is a 10 minute job and probably worth the effort. Totally understand about the cold weather though, doesn't make working any fun.

Re: Another pcv valve question, 4.7L [Re: VT_Dart] #198552 01/20/09 04:58 PM 01/20/09 04:58 PM
Joined: Jan 2003 Posts: 1,443 7 70duster340 OP pro stock
70duster340 OP pro stock 7 Joined: Jan 2003 Posts: 1,443	Yea, the screws won't break loose. I am hoping it is due to the freezing temperatures. I have sprayed them with PB Blaster, and hopefully that will help. I don't want to break the heads off the screws, so I have to be a bit gingerly with them. I'm afraid that the cold temps will make the screws brittle and they may break. Ain't got room the the garage to put it, anyway. The project car (Duster) is spread all over in there. Heck, it ain't heated, anyway!

Re: Another pcv valve question, 4.7L [Re: 70duster340] #198553 01/20/09 10:32 PM 01/20/09 10:32 PM
Joined: Jan 2003 Posts: 1,443 7 70duster340 OP pro stock
70duster340 OP pro stock 7 Joined: Jan 2003 Posts: 1,443	Well, I got one screw out, then the other (in the back, where it's not easily accessible) has began to round out. I gave up, for now. Any ideas on how to remove the offending screw? I tried to get a small vise grip on it, but not enough room. I need some assiatance here, please!

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