On higher mileage vehicles, one or more EGR orifice in the intake manifold may plug with sludge. This can cause the engine to misfire when first accelerating because too much exhaust gas is directed into the cylinders where the orifice is not plugged. Cleaning the clogged passages should correct this concern.
Engine Misfire Due to Plugged EGR Orifice on Mercury Monterey
Average mileage: 112,093 (72,000–195,000)
15 people reported this problem
5 people shared problem details
2005 Mercury Monterey129,000Visitor
When I am slowing down or stop it shutters and stalls. When I was driving it bucked and jumped a few times.
2004 Mercury Monterey115,000Visitor
EGR Valve replaced.
2004 Mercury Monterey102,000Visitor
same problem at accelerating, seems like its misfiring
I had code p0401 on my van. I cleaned my egr vavle with carb cleaner and reset code by disconn...
We change the oil and it goes away for a few months. We change the synthetic oil about every 2...
where is the egr valve located on the 2004 monterey, and do you have an engine diagram?
The problem started out with the following errors! 1. crankshaft position sensor fault, 2. misf...