Question about Mazda 626
Code p0303 refers to cyl 3 misfire detected ===causes engine mechanical fault--wiring--ignition/fuel system--injector--ECT/MAF sensor--ECM
code p0316 refers to misfire detected during start up --first 1000 revs===causes --engine mechanical fault--wiring--ignition/furl system--injector
the common fault cause is ignition/ fuel system and injectors so I would be checking fuel pressure and injector systems for clean and wiring connections are good especially on no 3 injector.
Posted on Apr 19, 2014
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Posted on Jan 02, 2017
I would take a look at the EGR valve and the air intake system, also look for any holes in air pipes or poor seals. Finally I would check the lambda sensor for the gas emmisions.
Hope that helps
Posted on Dec 28, 2010
Sounds like a bad fuel injector. Shop would need to run a contribution test to confirm. I must say, good detective work, good luck.
Posted on Apr 29, 2009
Had a similar issue with a 2003 ford taurus. Error codes of p305 misfire on cylinder 5 and first 1000 rotations. It did not smell like eggs. Rough/vibrating idle and lacking power at times.
Replaced spark plugs and wires. On the mine a 2003, I needed to remove the upper intake manifold, i believe it is called. Note not to pull out tubes on bottom when you life. This was to get at the rear spark plugs. 10mm 8mm 7mm and a flat head screw drive is all it took o and about 4 hours, im no mechanic : P I also used a splash of seafoam on the EGR valve and replaced the seal. I was impatient so i didnt soak it like I had read.
Anyways, turns out one of the spark plug wire boots had burnt. Also, 2 were severely corroded. This seems to be the solution, a basic tune up i guess.
Posted on Mar 19, 2012
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