A performance cam with lots of valve overlap can give an engine a lopping idle, but so can a vacuum leak. A really serious leak can lean the air/fuel mixture out to such an extent that an engine won't idle at all. An EGR valve that is stuck open at idle can have the same ...
Using starter fluid is the oldest trick in the book for finding a vacuum leak. With the engine idling, take your can and spray down the vacuum lines and listen for the engine’s idle to change. When you hear the motor come off idle, and rev up slightly, you have got your leak. Obv...
We strongly suggest that a visual inspection of the engine, is the first step in proper diagnostics. Is a wire loose ? Did a vacuum line fall off ? Danny’s Engineportal shares engine repair information. Engine repair tips, technical information, machine operations and engine testing with possi...
As the piston moves downwards in the cylinder, the intake valve(s) open(s), and the vacuum created by the piston’s motion pulls the air/fuel mixture in. Or if the engine has direct injection, the valves let in the air while the injector sprays an adequate amount of fuel to match. ...
Engine Repair When today’s engines experience sealing issues or are “opened up” for other repairs, it takes specialized knowledge and the latest gasket technologies to assure a trouble-free seal. Fel-Pro® — the leading brand of replacement sealing products for cars, light trucks, and ...
especially if they’re exposed to intense heat or extreme cold. This is the most common cause of vacuum leaks. Other common issues include cracked fittings and loose connections. Vacuum lines cost just a few bucks each, but tracing the source of the leak can be time-consuming — and expensi...
If you hear that, it can be an indication that your problem has a vacuum leak. To fix this problem, pinpoint the leak using a spray bottle filled with liquid dish soap. Then spray the dish soap all over the vacuum lines and the intake manifold gasket. Don’t forget the PCV valve if...
Technician A is correct because air can enter through a gap in the intake manifold, which is called a vacuum leak. Technician B is correct because a reduction in the amount of air entering the engine is similar to what occurs if the throttle plate is not opened. Answers a, b, and d ...
A P0300 code would indicate arandom misfire(probably due to a vacuum leak, open EGR valve, etc.). If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Causes...
There is no engine check light on, but a noise as from a vacuum leak. The car runs good,there is just this strange noise, that is making me think something with the air intake might be wrong. Any ideas if it might be something else or where to track eventual leak down on the ...