Quote:
|
Originally Posted by AnotherToothpick Where might I find the FPR on a 4.9L engine, and furthermore, should I even bother? What I mean to say is, was this a N*-specific issue?
I'm trying to pin down whatever may be causing various problems I've been experiencing, including extremely poor milage (<10mpg), a very rough idle (800-1000rpm), and sporadic knocking. |
i think i found it on the 4.9. Look under the air filter housing, It has a vacuum hose coming out the side if I am correct. Looks sorta like the one in the picture but is attached differently.
For the poor mileage I would suggest replacing the oxygen sensor, it is located just infront of the firewall and just behind the engine in the exhaust system. It brought my mileage from 9 to almost 14 without giving a service engine light. Also have you done the plugs/wires cap/rotor on it recently?
Knocking may be caused by cheap gas, bad timing ( which may cause Idle problems to) or problems with the egr tubes or solenoid/valve ( which could affect all 3 problems)
I would start with the cheap/free fixes first and clean the throttle body and egr delivery tubes which could raise mileage and cut knocking, also get on the oxygen sensor if you haven't, its only 20 dollars to replace and easy to do yourelf. And check your timing also.
If you haven't done the ignition system stuff like plugs,wires, dist. cap I would do that as well.
And push off and warmer to get any error messages to help you guide your searching.
The FPR can fail on any engine so its worth a check.
I think all of the above has been covered well indepth in other threads that I have seen.
Search "clean egr tubes" aaswell as "tuneup" and "o2 sensor" for a good start