I have a Mazda 3 2004 model, I have power loss between 3000 and 4000 revs, plugs and filter replaced.any advice plse

SOURCE: Runs real lean and surges under throttle massive loss of power

I had a very close problem, i had to have the fuel injecters cleaned. The truck runs 10 times better now. I had even changed the spark plugs, fuel filter, rotor and wires. have the injectors cleaned that could solve your problem

SOURCE: loss of power

I would check the spark plug wires. If the problem just came out of nowhere, good chance plug wire or wires is at fault. Another symptom pointing towards plug wires would be if it doesn't always do it especially when it's warming up or hasn't come up to operating temp. It will seem to run O.K. but once the vehicle engine warms to oper. temp. the problem will happen. If I am wrong let me know and we can check other things. Good luck

SOURCE: engine revs go high when changing gears but loss of power on MAGN

throttle body shaft seals are worn do a boost leak test and you will hear the leak
http://www.cobbtuning.com/info/?ID=3481

Marvin

• 85242 Answers
• Posted on Oct 09, 2012

SOURCE: My Mazda 6 2.0 Diesel runs rough between 1-2k revs and idles slightly erratically. No loss of power ,never stalls,always starts ok. Terrible to drive at low revs because of the shudder.

The following are the general instructions on the start of diagnosing any electronically controlled engine or transmission problem.

The engine and the automatic transmission (transmission control is only for automatics, engine is still computer controlled no matter the transmission type) in this vehicle are computer controlled and in most cases when a fault occurs a fault code is stored in the memory of the computer control module. There are exception to this, such as the Mass Airflow Meter and fuel pressure problems. What must be done is to have all the basic testing done such as a scan of the system for fault codes as well as a check with a live data scanner tool for engine functions that are not within range of normal, a trained technician is required to know what is correct and what isn't, then based on careful diagnostics done from a factory repair manual the correct part is replaced or the wiring repaired or the computer replaced (known as the PCM), which is very rarely the problem. Other basic checks must be done as well such as mechanical problems with the engine as well as engine state of tune and mileage on the engine. The transmission can have mechanical issues as well such as no gear engagement at all or a failed pump or other pressure related problems.

SOURCE: will not rev above 3000rpm, screaming noise in engine mazda tribute 2004 model,replaced fuel filter checked catalictic converter changed co2 sensor

sounds to be your transmission