Try the EGR, fuel filter, In-tank filter/sock-and redo the fuel pressure with and without vacuum-this will nail the pressure regulator and fuel pump, also check all your grounds to the computer.

Some TPS needs an initial adjustment to be set.

Recheck your ignition components-sometimes the coil when heated so bad it goes southbound.

Answered by rasmataz
68 questions asked

ya i replaced the fuel filter but did not change a thing, i did change back my fuel pump and saw a noticeable improvement. i have been getting a purge solenoid code from the computer. and i was checking my vacuum hoses the other day and noticed the vacuum chamber was completely filled with gas. kind of weird. grounds to the computer are tight and nice and clean. will check the egr, how can you tell if its defective? thank you for your help

Response from Bumpysbro
2 questions asked

the egr valve seemed to check out fine, but i did nail down that the fuel pressure when the vacuum hoses on the fuel regulator were disconnected showed no sign of psi change. it says on my manual it should rise 10 to 20psi when either both or one of the hoses are disconnected but the reader showed only a 2psi increase.

Response from Bumpysbro
2 questions asked

Pinch the return line and check what happens to the pressure

Answered by rasmataz
68 questions asked

when i pinched it the fuel pressure shot up very quickly. i replaced the fuel regulator but no luck on my part. the egr seems to test fine. car still struggles on highway. maybe my fuel pump

Response from Bumpysbro
2 questions asked

fuel pressure tested fine but have not yet tested the fuel pump it self

Put the gauge back On-and monitor the pressure-is it to specs?BTW do you have vacuum to the regulator hose?

-Do a backpressure on the exhaust system to rule out restriction.

Answered by rasmataz
68 questions asked

i had a backpressure test done and it was basically perfect. im gonna test the pressure today, the pressure regulator seemed to smooth out the idle and start off but no better power. ya i got vacuum coming from both vacuum hoses to the regulator. thanks for your help. been trying to nail this problem for a long time.
Jon

Response from Bumpysbro
2 questions asked

Disable the EGR and go road test

Answered by rasmataz
68 questions asked

i unpluged the egr valve and seemed to drive just a little bit better. and im getting codes for it, i tried cleaning it but maybe the diaphram is cracked or something. i also did another fuel pressure test. fuel regulator came up perfect but my fuel pump came up bad it wouldnt hold any pressure for more then 10 seconds and mazda says the fuel pressure should stay above 21psi for more than 5 minutes mine stayed above 20psi for 5 seconds haha. i dont think there are any other remedies to fix the egr valve except to replace it correct? thanks i get my new fuel pump tomorrow ill see how much that improves my power.
Jon

Response from Bumpysbro
2 questions asked

i put in a new fuel pump and the car drives better, but ya the egr i would suspect is the problem. with it connected and disconnected you can barely tell the difference and drives a little smoother without it pluged in. shouldn't it make the car run crappy?

Response from Bumpysbro
2 questions asked