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Ask Chris (aka- Moose) Your Own Question
Chris (aka- Moose)
Chris (aka- Moose), Mercury Technician
Category: Mercury
Satisfied Customers: 47681
Experience:  16 years experience with Mercury
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Mercury Monterey: I can hear a vacuum leak and have cylinder

Customer Question

I can hear a vacuum leak and have cylinder miss on 1 &5 cyl 04 monyerey w/4.2
Submitted: 2 years ago.
Category: Mercury
Expert:  Chris (aka- Moose) replied 2 years ago.
Hello, I'm Chris. Thanks for seeking us for help.
The easiest way to find a vacuum leak is to idle the engine and spray short burst of flammable brake cleaner, or starting fluid in short bursts around all gaskets, seals, components, hoses, and pipes between the tops of the heads to the air filters. All these things are under vacuum and will pull in the spray if there is a leak and the engine rpm will increase.
Is the vehicle due for a tuneup?
Have you checked for faulty plugs or coils or injectors?
Have you ran a compression test on these cylinders?
You want a excellent 5 star answer & I would like to be rated the same for providing it. Consider I don't know your skill level & I can't see, smell, hear, or touch the vehicle. It may take a few back and forth replies. Try your best to respond with good detail so I can do the same. I normally log in at 3pm and work late. A rating is required. Your rating me, what I type. I am not an employee of this website, nor have control over the fees or the time it took to get a response. If you rate negative or not at all you still paid, but I get nothing. I want you pleased with me and my efforts, so let me know if your experience here has come up short.
Thanks Chris
Customer: replied 2 years ago.
Yes I spent 23 yrs in the ssme private garage I know to spray cleaner I've done that and I know it is on the back or firewall side of engine is this engine common for intake cracks etc.
Expert:  Chris (aka- Moose) replied 2 years ago.
This engine is not known for intake cracks nor intake gasket or seal leaks. I actually rarely see lean codes and vacuum leaks on this engine. I would be checking for a hose cracked or a hose loose to blame.