2015 Mazda6 Misfire under throttle now more problems
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Joined: Oct 2025
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2015 Mazda6 Misfire under throttle now more problems
2015 Mazda6 2.5L-gas Touring 135,000miles: Driving on a trip, at about 60 miles without incident and without warning check engine light comes on, engine running rough and went into "limp mode" -- only able to drive about 35 mph. Code was P0304=cylinder 4 misfire. Replaced ALL 4 spark plugs. Ignition coils had just been replaced at 105,000 miles. Then test drove car, after about 1/2 mile it went into limp mode again, new codes P0300=random cylinder misfire and P0101=MAF sensor. Replaced MAF sensor. Still running rough and now surging engine without any throttle. Checked Intake Manifold, no cracks, replaced seal. Checked Camshaft Cover, replaced seals. No change. Still surging and won't run smooth. Replaced fuel pump under back seat. Sounded better, but went back to limp mode after about 1/2 mile. I am DESPERATE. I need a car and have spent over $1,000 on parts and towing my car. I have no money to take it to a Mazda dealer or mechanic -- please do not suggest that as a solution.
Senior Member
Joined: Oct 2018
Posts: 10,617
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From: Northern California
You just went all over the place randomly replacing unconfirmed parts.
So I won't say take your car to Mazda instead fine an ASE Certified independent service shop and make sure they have employed a currently certified Automotive Diagnostic Technician and pay for a 1 hour diagnostic charge to have them tell you what is wrong. Normally I would say don't tell them all the random parts you replaced but, in your case, maybe be better for you.
Sorry dude but you started off with not acquire all the proper information from the ECU/PCM and then confirmed first that the related parts were at fault. Or at least checked in the permanent file for older DTC that were not resolved and were cycling through and adding to more DTC as your response clearly indicates. You did not attempt to clear and rest the DTC make note of the permanent DTC and checked you I/M monitors and even reset them to see which of all these area would then regenerate the check engine light and for you to go quickly before driving much further after activation and retrieve the DTC and checked the I/M monitors again.
So I won't say take your car to Mazda instead fine an ASE Certified independent service shop and make sure they have employed a currently certified Automotive Diagnostic Technician and pay for a 1 hour diagnostic charge to have them tell you what is wrong. Normally I would say don't tell them all the random parts you replaced but, in your case, maybe be better for you.
Sorry dude but you started off with not acquire all the proper information from the ECU/PCM and then confirmed first that the related parts were at fault. Or at least checked in the permanent file for older DTC that were not resolved and were cycling through and adding to more DTC as your response clearly indicates. You did not attempt to clear and rest the DTC make note of the permanent DTC and checked you I/M monitors and even reset them to see which of all these area would then regenerate the check engine light and for you to go quickly before driving much further after activation and retrieve the DTC and checked the I/M monitors again.
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