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2001 Mazda Protege 1.6 low power. with the car idling i feel…

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2001 Mazda Protege 1.6 low...
2001 Mazda Protege 1.6 low power. with the car idling i feel exhaust flow out of the tail pipe
, but it almost completely stops the flow when pressing the accelerator. like its getting blocked
I have checked the cats and the muffler in at the tail pipe and the seem ok
Submitted: 2 years ago.Category: Mazda
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Answered in 4 minutes by:
2/11/2016
Mazda Mechanic: Tim Mohr, ase master replied 2 years ago
Tim Mohr
Tim Mohr, ase master
Category: Mazda
Satisfied Customers: 16,699
Experience: 30 yrs experience in Foriegn and Domestic, Gas and Diesel
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Hi, my name is ***** ***** you check the cat converters?

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Customer reply replied 2 years ago
as i said i have checked the cats can see right through them.
Mazda Mechanic: Tim Mohr, ase master replied 2 years ago

they cant be checked this way, you ned to do a exhausr back pressure tes, this is done by removing the upstream o2 sensor and installing a low pressure gauge, at idle, the back pressure must be lower than 1 psi, if its higher, then the cats are partially plugged,Tim

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Customer reply replied 2 years ago
ok tim what if the cats are not plugged what is the next test i needed
Mazda Mechanic: Tim Mohr, ase master replied 2 years ago

the only thing that will restrict the flow is the cats or the mufflers, nothing else, and this test will determine if its restricted,Tim

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Customer reply replied 2 years ago
ok i will preform that test, i have a off road racing head pipe with 3 02 sensors built in to it that will eliminate the cats all together. i can install it ( for testing only) as i have the cats off now already. it may change other drive ability factors but should eliminate the blocked cats questions. will this aid in my diagnosis?
Mazda Mechanic: Tim Mohr, ase master replied 2 years ago

absolutely, if it still feels restricted, then its most likely the mufflers, but the backpressure test would prove this 100%,Tim

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Customer reply replied 2 years ago
i will do a low pressure test to be sure. the cats are less then one year old. but the only thing i could not visually test was the resonator i tested the car with the muffler disconnected with no change. the exhaust seem to almost stop flowing out the tail pipe when under acceleration, no load
Mazda Mechanic: Tim Mohr, ase master replied 2 years ago

yes, do the low pressure test, it will determine it 100%,Tim

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Customer reply replied 2 years ago
it will tell me 100% if the exhaust is restricted or not, but were is the restriction will be the real question. as you have stated if there is reduced flow out of the tail pipe there must be restriction some were. and since i cannot visually inspect the cats does it mean i need to replace both cats?
since i do not know of a way to test each component separately, except a visual inspection does it mean i will need to replace the entire exhaust system?
Mazda Mechanic: Tim Mohr, ase master replied 2 years ago

NO, YOU CHECK EACH CAT SEPRATELY, THERE ARE 2 UPSTREAM O2 SENSORS, ONE FOR EACH SIDE, IF ONE TEST GOOD AND THE THER BAD, THEN ITS EASY, REPLACE THE BAD CAT, BUT IF THERE IS MORE THAN 1 PSI IN BOTH, THEN EITHER BOTH CATS ARE PLUGGED, OR THE MUFFLER, THE RESONATOR WILL NOT CLOG UP, ALSO, PUTTING THE STRAIGHT PIPE ON IT, WILL ALSO RULE OUT OR VERIFY THE CATS,TIM

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Customer reply replied 2 years ago
Tim i by passed both cats and i still get reduced exhaust flow at the tail pipe under acceleration. the only thing i have not tried is to by pass the resonator.
Customer reply replied 2 years ago
Tim i tested back pressure test at the 02 sensor closest to the exhaust manifold. the first one in the system. it reads zero 0 psi at idle and it just barley will start to move at 3000 rpm. the gauge is a 0 to 10 psi unit
Mazda Mechanic: Tim Mohr, ase master replied 2 years ago

then there is no restriction in the exhaust, what problems are you having with this?

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