i dont know to much bout these things but i do know that if they go out it will drop ur mpg... but im not sure how to tell if it has gone out... i was told if the hose i have circled has no suction then i need to replace it cause its not bring the unburned gas back to the motor... somethin is diffenetly wrong cause my mpg has gone down to bout 12.5

 

they arent that hard to replace. i just did mine about a month ago.

 

yea but i dont want to replace it if its not bad... moneys hard to come by... lol

 

do a search. im pretty sure there is a way to test it to find out if its working. i think you take off that line coming out the top of it. and a connect some house and suck on it. if the idle changes then its fine. but i could be wrong

 

it's what I know about it

 

No suction from the hose...well I don't think there would be suction, suction would indicate that the EVR solenoid is attemping to hold the EGR open, so suction should be on the EGR valve hose when it should be open correct? But..for good measure, follow that vacuum hose to make sure it is all in one piece and not broken or rotted through.

 

Vacuum should only be applied to the EGR valve when commanded by the PCM, which is NEVER while sitting in your driveway. EGR is only commanded during steady-state cruising, never while sitting still or idling.

Nothing in your posts indicates any troubleshooting that may have guided you to the EGR system as the suspect for your drop in fuel economy. Generally, unless the valve is stuck open (either by a faulty command, possibly due to a failed DPFE sensor, or by mechanical failure), EGR flow generally won't affect fuel economy.

Again, without knowing what you've done, I'd suggest you're looking in the wrong place for a dramatic drop in fuel economy. More likely suspects include a dirty/damaged MAF sensor (especially if you use an oiled filter) or an intake vacuum leak or weak/degraded spark system.

Have you had a check engine light and any fault codes?

Steve