Q:Why can't i start my valve?

makes no sense try again

Q:I have a 1989 Jeep Cherokee with 218,700 miles on it and my engine has thick oily gunk on it, possibly from a leaky valve cover gasket, should I change the gasket? I have been told that this is normal and not to worry about, but from the amount of this gunk, I find it hard to believe this is normal. The top of the valve cover has a light covering of gunk, but on the sides and towards the bottom of the engine. it gets very thick and at some places you can't even make out whats suppose there. Does a leaky valve cover gasket mean that there is another problem going on?Can leaving the oily gunk on the engine cause any problems?Any info would be greatly appreciated.

Usually, a leaky valve cover gasket is just that. A leaky valve cover gasket. Unless you are building up high internal pressure from a clogged PCV for example and literally forcing the oil out the weakest point, there usually is no underlying issue. Leaving the oily gunk does a couple things. If its on rubber such as any hoses that aren't oil resistant, they will degrade quickly. The same can goes for wiring insulation, motor mounts, or even the rubber seals on some of your front end pieces. Also, wrapping an engine in a thick layer of goo doesn't let it cool as it should and puts more thermal burden on it. What you do at this point is a question of how much longer a 1989 Jeep with 218,700 miles will go or how much longer you want to keep it.

Q:I have a 1997 Toyota Corolla. My check engine light has been on. I tried to get my car smogged and it failed. I then got an oil/air filter change and just yesterday I replaced the EGR valve which was the result given after 2 diagnostic tests. The mechanic gave me my car and the check engine light was off, I've only driven about 5miles and the light is back on. I have to pass smog asap to register my vehicle. I plan on calling the mechanic back and telling him the light is on, but could it just be a sensor?

The problem obviously wasn't the EGR valve. It is a solenoid that controls the EGR valve. A very common problem on Toyotas. Tell your mechanic to replace the EGR VSV solenoid. He will probably tell you that it tests fine, but that's the way they look when they fail. Just replace it. Google toyota egr vsv for verification. It is very easy to check flow, attach a vacuum pump to the valve and pump it up, if the engine stalls the valve is good, if the engine doesn't stall, the passage is probably plugged as the valves rarely fail.

Q:Serious answers only please. I have a 1995 Ford F-250 XL 5.8L 351 c.i. engine. My check engine light comes on periodically when I drive. When I bought the truck a year ago the gas mileage wasn't too bad, about 9-10 mpg. I've only put about 3,000 miles on it this past year, and now the needle drops just driving it across town. I work at a Chevy dealership, and I've worked at another Chevy dealer as well as a Ford. I've always done my own work on my cars and am currently restoring a 1967 Mustang, so I have decent knowledge under the hood. I scanned the truck and it has a stored code for EGR valve voltage too high (stuck open). How bad could this be hurting my gas mileage? It's $160 for the valve and sensor even after my discount, and being a college student that's a lotta $ to pay. I'm selling the truck and need it running perfect when I do. Please, serious answers only, and help is greatly appreciated!

EGR valve should be opening at higher RPM's and closing at lower ones. Check the shaft positioin on the EGR valve with the engine idling (you might need a flashlight and mirror on an extension rod to see it on your vehicle). When the engine is revved up, the shaft should move away from the engine. If its not moving or it moves open but doesn't close all the way, it could be that the valve seat of the valve is broken and holding the valve open. If you do end up replacing it, clean out the carbon if there is any in the opening of the engine that leads to the EGR valve.

Q:Where are the valves. And how do I fix it? Will I have to buy anything? I have a 98 Honda fourtrax 300.

You certain its a valve noise and no longer an exhaust leak up near the head? They can sound very equivalent. If it's a valve noise the very first thing to check for is oil stress. Due to the fact you say it can be good maintained I have to expect you have changed your oil AND filter at the recommended intervals. Let me recognize, i know probably the most prior shadows had a unconventional hydraulic valve procedure where you had to force oil right into a chamber for the lifters. In case you misplaced that oil the lifters do not operate accurately.

Q:I think on old AC units They had a different valve than the shrader. It might be called a king? Anyway, I can't get my gauge to read the pressure. The needles don't move at all. How can I measure, refill this type of HVAC?

Unless you are EPA certified, you have no business checking the refrigerant in old AC units. If you get caught, you could face a hefty fine.

Q:My friend had heart surgery and it was pretty serious. She got a new heart. Days later they checked her and discovered that she bursted a heart valve. The doctors say it's one she can live without. That really concerns me. The valves connect directly to the heart. Please help.. Will she be ok if she doesn't get it replaced?

You can't live without a heart valve. Your friend might have a valve regurgitation which may not be a problem depending on the valve.

Q:What is the primary function of valve seals?

Valve seals are placed over the intake valve guides so oil will not be drawn into the combustion chamber on intake stroke.

Q:I was considering making a ball valve PVC air rifle or something of the sort using a PVC air canister and a hand pump, but I wanted to know about it, last year I made one that was air tight but air leaked out of the top of the pump which really annoyed me, I looked further onto the it and found out that there was a Bike Tyre valve, What does it do? Does it let air flow in but stop it from coming out? and where would I find some good designs as well as the items needed to make it? And don't bother answering 'Buy an air soft gun' because Australia does not retail those.

These bike tire valves are called schrader valves i got mine from a car repair shop where they like had them for free. I mounted it into a pvc pipe by drilling a hole just big enough for the stem but there was a ball at the end that keeps it from falling out. Then to seal it you could you gorilla glue or epoxy to make it air tight

Q:I have a 04 Ford Ranger 4.0L . some people are saying that headers may affect the EGR valves and might put up the check engine light on. is this true or not.

the okorder so the headers stay tight and wont leak..