Mercury Repair Questions? Ask a Mechanic for Answers ASAP
Hello what engine is in this truck 4.0 or 5.0? SOHC or OHV?
Ok no problem, just needed to know what engine was in the vehicle, so it runs ok,just idles rough. How many miles are on the engine? No vacuum leaks? Any major engine repairs done recently and now having this concern? If you hook up a vacuum gauge to the engine is the needle bouncing a lot?
The idle air control valv controls the cold and hot idle. If a sensor was out it should set a memory code, Key On engine off on demand code or key on engine running on demand code if you havent run these tests and just pulling memory codes. With it running ok cold then having issues hot I woud suspect an issue with a valve seating properly. A vacuum gauge will tell if you have a broken valve spring if the gauge flutters.An engine compression test when the engine is hot will tell you more about the base engne condition.
Very good.let me know
If the vacuum is going negative, it could be a clogged catalytic convertor, if you loosen the exhaust to have a leak and drive the vehicle and the concern is gone I woul suspect a plugged cat.
It should have two nuts or bolts holding it to either exhaust manifold to seperate
Hard to say,im not familiar with or have used that product
No, thats all I have to suggest at this time
Only other thing would be to check the pcv valve to make sure it isnt sticking to draw a negative vacuum