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Drew
Drew, Super Mazda Tech.
Category: Mazda
Satisfied Customers: 2188
Experience:  19 yrs. experience. Mazda Senior Certified Tech, with Ford, Linc. & Merc. experience. ASE L1 Advanced Certified Master Tech.
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Replaced plugs and coil packs but still getting a p0300 code

Customer Question

Replaced plugs and coil packs but still getting a p0300 code for misfire
JA: Have you seen the misfire code before? Has the car been stalling?
Customer: Check engine came and the car started running rough got codes P0301,302,306,304 replaced all six plugs and coil packs,egr,air idle control and the car is now throwing a p0300 code..Also noticed one of the vacuum lines for the pcv valve is trying to suck itself shut
JA: What is the model/year of your Mazda?
Customer: 2002 Mazda tribute 6cyl 4wd
JA: Are you fixing your Tribute yourself? What have you tried so far?
Customer: Nee plugs,coil packs,EGR valve,air idle control valve
JA: Anything else you want the mechanic to know before I connect you?
Customer: No
Submitted: 2 months ago.
Category: Mazda
Expert:  david craig replied 2 months ago.

Hi Im David, thanks for visiting the site. Remove the oil filler cap while the engine is running and see if you feel suction

Customer: replied 2 months ago.
I will do that as soon as I get out of work and let you know..
Expert:  david craig replied 2 months ago.

ok. thanks

Customer: replied 2 months ago.
There's no suction and now I'm getting codes for P0304,0305,& 0306 in addition to the p0300.. Literally just put in new plugs and six new coil packs two days ago
Expert:  david craig replied 2 months ago.

ok. you will need to check injector pulse

Customer: replied 2 months ago.
What is that??
Expert:  david craig replied 2 months ago.

to see if the fuel injectors are getting a command from the compouter to spray fuel.

Customer: replied 2 months ago.
I don't have the tools for that
Expert:  david craig replied 2 months ago.

then you are goingg to need to pull the rail and see the injectors are spraying or run to harbor frieght and but a set on injector noid lights for very little money.

Customer: replied 2 months ago.
Thanks for your help but I think I got it figured out..Timing belt went while it was idling in my driveway..Might explain why she was running out of time
Expert:  david craig replied 2 months ago.

oh boy. not good. did it jump time or break?

Customer: replied 2 months ago.
Jumped
Expert:  david craig replied 2 months ago.

ok, hopefully not more tan a tooth or 2

Customer: replied 2 months ago.
It's actually a chain not a belt..My question is because it actually jumped while the car was idling not while driving, being as the 3.0 IS an interference engine what are the chances there is no internal damage
Expert:  david craig replied 2 months ago.

the chances of bent valves are fairly good. doesnt matter is it was idling or not, the engine was still rotating

Expert:  david craig replied 2 months ago.

Can I help with anything else?