2004 mazda rx8: 58 lbs. fuel pressure & plenty of volume. good ignition. there is also a code 1688. i can dissconnect 1st and last ignition coil and no change in performance is made. but coils are working and plugs and wires are good. compression is 175 lbs @ idle. Would appreciate any help you could offer. i dont normally work on rotory engines so im kida out of my element here. thanks in advace. Jack
White spots caused by heat build up on the back of the coil pack is a sign that the coils are grounding out on the inside of the casing. Mazda have released revised version in hope to combat this common fault in RX8 engines.
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check fuel pressure with a gauge as well as fuel volume. pressure should be around 35 lbs and the volume should be about 1 litre in 30 seconds. if its not then this can cause poor power going up hills and accelerating. how long has it been since the fuel filter was changed.
Won't be the fuel filter as you change that every 3 to 5 years
You could check fuel pressure at the motor with a gauge or professional scan tool data
The exhaust converter may be worn out & partially blocked Shouldn't be until it is 12 to 14 years old, but most people have cylinder misfires for years & no codes & don't know it & so goes the converter
Have to change the upstream oxygen sensors at 100,000 miles as preventative maintenance & clean maf sensor once a year
New spark plugs every 3 years,they don't last 100,000 miles, never have,same for your trans & power steering fluids, every 3 years, not every 100,000 miles or never
You will need to have the fuel pressure monitored under a load with a special tool and also drive it for a while and see if the check engine light comes on, if it does have the system scanned and diagnose the codes received.
looks like not enough fuel pressure, check the fuel filter. and the fuel pump pressure.with car running 60 psi the pump is located at the rear seat driver side you have to remove the carpet to access the cover. if the fuel pressure checked "OK" suspect defective maf sensor (sometimes defective maf sensor do not show errors codes)another way to test is disconecting the maf sensor and start the car (computer goes to limp in mode) and works little better,or check by scanner idle= low grams per seconds and increase when accelerate.
I've never found an accessable extenal one on our 2004 MPV [crazy, huh?] But we have the official factory technicians service ["workshop"] manual, purchased from Mazda & it lists 2 fuel filters - it shows both are in the gas tank; the low pressure appears to be the simple screen on the pump intake & the high pressure is in the outflow from the pump - apparently connected to, or just under, the "fuel pump unit cover." So the answer is: both the "low pressure" screen & what I would call the "real" high-pressure filter are inside the gas tank.. Hope that helps Cheers, Bk