When to replace the PCV valve in a Mazda 3? I tend to thick of a PCV valve replacement as a 150k maintenance item. If it hasn't failed by then, replace it. That's also a good time to replace the IM gaskets since the IM has to come off to get to the valve. Of course, I'm talking about Gen1 models and don't know if they changed the accessibility of the Gen3 models. Probably not! When do you need to replace the PCV valve? There is no fixed interval of when you should replace the PCV valve. However, because the...

What makes a dual overhead camshaft a DOHC? ­­Generally, engines with dual overhead camshafts (DOHC) are higher performance engines, they produce more power, and can run at higher spe­eds. The camshafts have the job of opening the valves that let air into and exhaust out of the engine. The camshaft uses rotating lobes, called cams, that push against the valves to open them. What does it mean to have an interference engine? An interference engine is one that has insufficient clearance between the valves and pistons if the cam stops turning due to a broken timing belt. The result is...

Are there any problems with the turn signal on the Dodge Caravan? Dodge Grand Caravan owners have reported 20 problems related to turn signal (under the exterior lighting category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Dodge Grand Caravan based on all problems reported for the Grand Caravan. Why are my left and right turn signals not working? Replace any bulbs that are not lit. The flasher unit is used to switch the current on and off for both right and left directionals. If the turn signals are inoperative...