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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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Changed the engine and now its a rough idle no check engine

Customer Question

changed the engine and now its a rough idle no check engine light
JA: Does the light stay on, or does it blink?
Customer: there is no check engine light
JA: What is the model/year of your Mazda?
Customer: 2008 mazda 6 2.3l
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: I am a ase certified master tech with 30 years experience but never with mazdas and the only thing I'm not sure of is setting the crank sensor
JA: Anything else you think the mechanic should know?
Customer: when I changed the engine it ran good but had a rod knock I replaced with a long block and now it has a very rough idle
Submitted: 1 year ago.
Category: Mazda
Expert:  Wayne Crawford replied 1 year ago.

Hello. My name is ***** ***** I will be helping you today.

If the check engine light is not on why do you think it is misfiring?

Customer: replied 1 year ago.
I said it's a rough idle but I am a ase certified master tech with 30 years experience just no experience with mazda
Customer: replied 1 year ago.
this car is my son's car and I was helping him out with changing the long block the long block was a stripped long block so all sensors and manifolds were from the original car and the only sensor that has an adjustment is the crank sensor and I was not sure if that may be my issue since the car ran fine before the engine change only had a rod knock
Expert:  Wayne Crawford replied 1 year ago.

What do you mean by rough idle if not misfire?