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If you do not replace a bad vacuum cut valve, it can lead to poor engine performance, reduced fuel efficiency, and increased emissions. The engine may struggle to maintain proper vacuum levels, resulting in issues such as rough idling or stalling. Over time, neglecting this issue can cause further damage to the engine or associated components, leading to more costly repairs.
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Where is the pcv valve on 1994 Toyota Celica?
The PCV valve is located on the top of the valve cover. To test the PCV valve, start the engine, pull the valve out of the valve cover and put your thumb over the hole in the end. If you hear a little click, then the PCV valve is good. If there is no vacuum at the hole, either the valve is bad or the hose is bad. To see if the hose is bad, pull the hose off and put your thumb over the end. If there is vacuum, replace the PCV valve. If not, replace the hose. It's important to note that PCV valves are sized for specific engine applications. The wrong PCV valve for an application can flow too much or too little air causing driveability problems.
How do you replace the EGR valve in a 1996 Lexus ES300 to resolve 'insufficient flow' and 'check engine' message?
P0401 "egr insufficient flow" can indicate many things, including: 1-vacuum line plugged or leaking 2-pipe from exhaust to egr valve plugged 3-pipe to vacuum modulator valve from egr valve plugged 4-passages at egr are plugged 5-bad egr valve 6-bad EGR VACUUM MODULATOR VALVE I tried cleaning egr modulator valve, (beside/above egr)removed and tested egr vacuum & movement, inspected and cleaned all vacuum lines openings and pipes. All above did not work. I replaced the egr vacuum modulator valve. Light went out without a reset in about 30 miles of driving. Not sure if this valve can be cleaned. Retails for $69.US
Where is the EGR valve on a '91 Aerostar 3.0?
It.s under the plenum (that's the big silver thing) near the back. Don't replace or service it unless you have pinging or have failed emissions on the NOX test. you only need to replace the EGR if the vacuum diaphragm inside is broken. you can check it with a vacuum gun. another reason to service valve is a bad sensor or carbon build up on the pintle.
What are the symptoms of a bad EGR valve in a 2000 Saturn SL?
A bad EGR valve in a 2000 Saturn can have several symptoms. The EGR valve can cause misfires, the valve can cause vacuum leak style problems. There could also be an engine knock.
Why is my brake pedal too firm?
If you have power brakes it may be the vacuum booster. The booster may be going bad, the check valve in the vacuum line or a cracked vacuum line.
What would cause a Chevy vortec to surge?
Low fuel pressure, bad IAC valve, vacuum leak, bad injector(s). You also need to check the EGR valve.
How can you tell if egr is bad?
If you are talking about the EGR valve, then take a piece of rubber tubing and plug it onto the EGR valve vacuum port and using your mouth pull a suction on the tube. The valve should actuate (pull in) and if you hold it with your tongue by stopping up the end of the tubing, it should also hold it's vacuum. If it loses it's vacuum or doesn't actuate it is bad.
How do you repair car vacuum leak?
Depending on where the leak is you just replace the vacuum hose or the bad part the hose is attached to.
Why does a 1999 Pontiac Transport stall when braking coming to a stop.?
Perhaps a vacuum leak or bad vacuum check valve in power brake booster
What would make a 1999 ford contour run bad just idling but runs fine on highway?
Vacuum leak. Replace all vacuum hoses under the hood. Replace one at a time as to not get confused.Vacuum leak. Replace all vacuum hoses under the hood. Replace one at a time as to not get confused.
How do you replace the EGR valve on a 1998 Mercury Mountaineer AWD vehicle?
I believe it is at the top rear of the engine (between engine and firewall, just left of center (passenger side). You have to remove (2) bolts (bolted in from the back, toward the front of the vehicle), next, remove the EGR tube nut that goes to the bottom of the valve. Typically, the valve does not go bad. You can test the EGR valve by removing the vacuum connector from the top of the valve, and add vacuum to the top of the valve. If the valve works, the engine will shudder when vacuum is applied. Typically EGR problems on these are caused by the DPFE senser that is located next (toward driver's side)to the EGR valve. It also bolts in from the back with two small bolts, and has (2) vacuum hoses connected to the bottm of the switch.
Why does the air condition stop blowing when you go up a hill?
You are losing vacuum from cracked/bad vacuum lines or the vacuum check valve for the HVAC controls is bad. When the engine is under load climbing that hill it does not produce enough vacuum to operate a leaky HVAC system.
