Autozone PCV valve

Callmewhitexr7

Registered User
Ok I got a pcv valve from autozone and put it on my car, it made the car idle alot better, but about a week later the car began to idle very crappy and rough, so i replaced the pcv valve again with one from autozone and this fixed the idle. so my ? is do the autozone pcv valves have a problem that makes them mess up and why would this fix my idle? Also everytime I seem to post on this board no one answers any of my posts, I try to answer other posts to help out everyone, but why does no one answer my post? thanks


NICK
 
maybe no one has answers to your questions?


I looked this up for you.


Positive Crankcase Ventilation (PCV) System

The Positive Crankcase Ventilation (PCV) System (Figure 1) cycles crankcase gases back through the engine where they are burned. The PCV valve regulates the amount of ventilating air and blow-by gas to the intake manifold and prevents backfire from traveling into the crankcase. The PCV valve should be mounted in a vertical position (Figure 1). On some engine applications, the PCV system is connected with the evaporative emission system.

Do not remove the PCV system from the engine. Doing so will adversely affect the fuel economy and engine ventilation with resultant shortening of engine life.


AND

Positive Closed-Type Crankcase Ventilation System

A malfunctioning closed crankcase ventilation system may be indicated by loping or rough engine idle. Do not attempt to compensate for this idle condition by disconnecting the crankcase ventilation system and making an air by-pass or idle speed adjustment. The removal of the crankcase ventilation system from the engine will adversely affect the fuel economy and engine ventilation with resultant shortening of engine life.
 

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and Diagonistics:

VALVE CHECK


NOTE:
Set parking brake and block wheels. Place transmission/transaxle in NEUTRAL or PARK. Place the A/C-Heat selector in the OFF position.

l Remove PCV valve from rocker cover grommet (for 5.0L cars, the PCV valve is located on top of block by firewall).

l Shake the PCV valve.

l Does PCV valve rattle when shaken?

Yes
REINSTALL PCV valve. GO to «PCV2».

No
PCV valve is sticking.
REPLACE PCV valve.

________________________________________



PCV SYSTEM CHECK


l Start engine and bring to normal operating temperature.

-- Disconnect hose from remote air cleaner or air outlet tube (tube connecting mass air meter and throttle body).

-- Place a stiff piece of paper over the hose end. Wait one minute.

-- Does vacuum hold the paper in place?

Yes
System is OK. RECONNECT hose. GO to «Section 2A» for other possible causes of vehicle symptoms.

No
System is plugged or Evaporative Emission Valve is leaking (if equipped). GO
to «PCV3».


_________________________________


PCV3 EVAPORATIVE EMISSION SYSTEM CHECK


l Disconnect evaporative hose (if equipped), cap the connector and retest.

l Place a stiff piece of paper over the hose/nipple, as in PCV2. Wait one minute.

l Does vacuum hold the paper in place?

Yes
GO to Evaporative Emission System, «Section 11A».

No
CHECK for vacuum leaks/obstruction in the system: oil cap, PCV valve, hoses, cut grommets (oil separator on 2.3L HSC, 2.9L and 4.9L engines) and rocker cover for bolt torque/gasket leak. SERVICE as necessary.
 
Could be a bad batch. Try a different make.
Does the bad PCV valve rattle (as Billabong089 suggested)? Is it extremely oily?
 
well no one manufactured Autozone's PCV HERE, so I dont think anyone can answer your question, go to Autozone, tell them it doesnt work, you would like your money back. Take your money and get it some where else. Problem Solved.
 
The Ford ones are the only ones that work properly. A supercharged motor builds crankcase pressure under boost and the Ford ones are the only ones what will positively seal stopping crankcase pressure (and lots of oil) from getting into your intake plenum. A good valve should only pass air when under vacuum. No aftermarket PCV valves are any good for our motors.
 
XR7 Dave said:
The Ford ones are the only ones that work properly. A supercharged motor builds crankcase pressure under boost and the Ford ones are the only ones what will positively seal stopping crankcase pressure (and lots of oil) from getting into your intake plenum. A good valve should only pass air when under vacuum. No aftermarket PCV valves are any good for our motors.
Hey Dave.
Are the Ford PCV Valves a dealer only part, or can they be purchased from other distributors (on-line)?
LMK
Thanx
Bill
 
Dave's right, it's amazing how sensitive pcv valves are. So buy the Motorcraft EV 145 and move on. Even on my '91 Escort GT (1.8 DOHC) the valve cover would leak using the Purolator pvc. Went back to Motorcraft, no problem.
 
i put a check valve on my AUTOZONE PCV thingy, well now this question, is that metal tube that connects the tube to the plenum and to the extra hose and to the PCV necessary? can i just put a T FITTING because ever since i changed the valve i cant seem to line it up straight, thanx
 
darkstar_one said:
i put a check valve on my AUTOZONE PCV thingy, well now this question, is that metal tube that connects the tube to the plenum and to the extra hose and to the PCV necessary? can i just put a T FITTING because ever since i changed the valve i cant seem to line it up straight, thanx

yeah, mine won't line up either. it gets in the way of my tranny dipstick. :mad:
 
yes the PCV valve rattles alot and its oily when i take it out. I'm just going to get one from ford cause now my cars acting up again and just changed it a few days ago. Thanks for all the help. Also what does it mean when it rattles alot and is oily?


NICK
 
Hi all.
Dave is right, this is from an old post by Rob:

"Some oil in the intake from the PCV system is a common thing on these cars. Especially if the PCV valve has been replaced with an aftermarket one - Ford has a special valve for the SC that supposedly works best, it's only a couple bucks from Ford.
Rob
'91 Ford Thunderbird SC"
Vidar.
 
Callmewhitexr7 said:
yes the PCV valve rattles alot and its oily when i take it out. I'm just going to get one from ford cause now my cars acting up again and just changed it a few days ago. Thanks for all the help. Also what does it mean when it rattles alot and is oily?


NICK

One symptom of a defective PCV valve is if it doesn't rattle. It should be oily because of the oil fumes that it's supposed to vent. From experience I know that it should be somewhat oily - so if it is very oily I would suppose that something is wrong. In addition, if it is very oily then it will get clogged and stop working. If anyone has a more scientific explanation, please help out.
 
hey everyone I appriciate all the help. So theres two pcv valves on the car? were are they located at? Thanks again for the help


NICK
 
they both are located on each valve cover, the one on the passenger u need to replace it with a genuine motorcraft one and the one on the dirvers side can be replaced with a EL CHEAPO one.
 
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