Hello all! I have a 2011 cx7 grand touring 2.3L w/ a turbo. Car started ideling high and almost surging (rpms) at stop signs and lights. Code reads misfire on cylinder 3. I've changed plugs and coil. A solenoid. A cracked air hose. Car over heated after driving an hr to AZ and all of my coolant poured out. Upon taking the manifold off I found 2 hoses that had been badly damaged, leaking coolant. My mechanic thought I needed new head gaskets but upon doing a compression test, says I do not. I've been told this could be a turbo or fuel injection issue. I've already spent over $700 on repairs and have now ordered the injector @ $324.00. If this doesn't fix the issue Idk what I'll do! Please help if you have any advice! Thanks in advance!

Pics of hoses are attached. But I feel something caused them to rupture and coolant to pour out. Idk if the 2 issues are related.

 

Just wanted to come back and leave the solution to the above issue I was having. After changing out the fuel injector on cylinder 3 all codes cleared and car is running great! Just FYI for anyone with these future issues to consider.

 

Note mentioned codes not code and the DTCs were not all listed in the first response!
Unfortunately because you changed so many unconfirmed parts and no diagnostics work, as well no indication your before and after compression test you final solution cannot be the confirmed contributing part that solved you issue.

Never randomly start changing parts guessing if they failed pt failing without first testing them. Often doing so will cause other additional unresolved issues or waste time and money changing parts that are still good.

 

There was plenty of diagnostic work every step of the way. My car was diagnosed 3 different times actually and It started with misfire on cylinder 3, system too lean (not sure of the codes, I think 0300 maybe?) and continued to be the same issue throughout this entire process. Until the fuel injector was replaced. Now the code has cleared and stayed cleared and the car is driving better then ever. I drove back from AZ to NV with no check engine light, no over heating and the issue is fixed. The only reason I changed the fuel injector in the 1st place was bc I was told by a mazda mechanic that this is a common issue. Just putting this out there in case anyone else has similar issues as food for thought.

 

Ok then ....
Nothing you posted indicated that whoever did the diagnostic testing did it correctly or accurately. Dude, I read these things every day on various forums, and I know there are too many "mechanic's" and especially DIY that think they know what they are doing and even more DIY the same.... Unless you are trained in a classroom environment having to do specifically with Automotive Diagnostics a self-taught or simply having a Diagnostic scanning tool or a mechanic thinking he/she is more than that because they work on vehicles in general weekly does mean you know what you are doing. Based on your posted information you received poor diagnostics and started a HIT and missed procedure replacing parts without confirming them to be the problem.
I would also add that this last post is also supportive of what I posted about those not knowing how to use and what to look for in an ECU.
Not one time did you posted "ALL" the DTC and monitor state, counter for the event etc., other than 1 misfire DTC???

Bottom line if all your money spent on replacing good parts and eventually by mere process of elimination replacing parts you solved you issue then good for you!

Any currently certified ASE Automotive Technician or the like a Mazda factory trained Automotive Technician can find any problem that the ECU monitors in up to one hour and be correct.


ASE