Why does your check enging light keep coming on. It always reads EGR valve insufficent flow. The mechanics says there is nothing wrong at all.?

Answer 1

There's a small sensor that sits in mid air on 2 hoses that come off one of the lines to the EGR valve. It has a 2 pole electrical connector going to it and sits about 6" above the driver valve cover and 8" behind the Power Steering fluid reservoir. It's Motorcraft part # should be 4U7E-9J460-AA. This is a common problem on the 4.6's especially. What's the year and engine size of your truck?

AnswerGo to another mechanic. If the light is on, then there is something wrong with the emissions system. Sounds like the EGR valve need cleaning or replacing. AnswerMiata engines typically run very rich and it is not uncommon for carbon deposits to build up enough to clog smaller ports on the emissions system. The common culprits are :

1. Crudding on the EGR Valve itself, which will cause the mechanism to freeze. You can review cleaning this at the following site:

http://sites.Google.com/site/redcapsmiata/tutorials/egr-valve

2. The port after the EGR valve, which runs into the front of the intake manifold:

http://miata.net/garage/manifold/index.html

Both cleanings can be done by people with a basic, mechanical aptitude.