Geffellz18
Senior Member
for an ‘07 Mazda CX-9. 3.5L V-6. Roughly 212000 miles on the ticker.
Just got back from a trip to VA & ran fine on the trip. Has had a slight miss for awhile like a coil pack starting to go out or spark plug miss. Nothing too major.
Wife pulled out of the driveway last week and headed up the hill out of the neighborhood. About halfway up the hill, she said the engine light came on, it shuttered and shut off. Was unable to restart it but got it coasted back down into the yard.
Put the code reader on it and the only code was cylinder 3 misfire.
Since I’ve had the car for over 100k miles with little to no major issues other than a head gasket leak that was repaired quickly, figured it just needed some new spark plugs & since I was going to have the intake manifold off & cylinder 3 was on the firewall side of the engine, I went ahead & ordered & installed new coils too.
Changed them all this weekend. Still won’t turn over. Moved on to the next potential culprit & ordered new relays. Still nothing.
It will try to crank & seems to even spark, but won’t turn over.
My next guess now would be possibly the fuel pump went out.
Any ideas on where to aim my focus next.
Should be good on the air & fire side, so that’s why I’m leaning towards fuel.
If I’m in the right direction, how hard is it to test for that? Would a fuel pressure gauge test kit work to test before blindly buying a pump to replace?
Not looking to put much more into it, but was hoping to get one more year out of her before putting her out to pasture!
Just seems to be a minor issue as it pretty much ran as normal up until that point and hasn’t given us any issues during the time we’ve owned it.
Just got back from a trip to VA & ran fine on the trip. Has had a slight miss for awhile like a coil pack starting to go out or spark plug miss. Nothing too major.
Wife pulled out of the driveway last week and headed up the hill out of the neighborhood. About halfway up the hill, she said the engine light came on, it shuttered and shut off. Was unable to restart it but got it coasted back down into the yard.
Put the code reader on it and the only code was cylinder 3 misfire.
Since I’ve had the car for over 100k miles with little to no major issues other than a head gasket leak that was repaired quickly, figured it just needed some new spark plugs & since I was going to have the intake manifold off & cylinder 3 was on the firewall side of the engine, I went ahead & ordered & installed new coils too.
Changed them all this weekend. Still won’t turn over. Moved on to the next potential culprit & ordered new relays. Still nothing.
It will try to crank & seems to even spark, but won’t turn over.
My next guess now would be possibly the fuel pump went out.
Any ideas on where to aim my focus next.
Should be good on the air & fire side, so that’s why I’m leaning towards fuel.
If I’m in the right direction, how hard is it to test for that? Would a fuel pressure gauge test kit work to test before blindly buying a pump to replace?
Not looking to put much more into it, but was hoping to get one more year out of her before putting her out to pasture!
Just seems to be a minor issue as it pretty much ran as normal up until that point and hasn’t given us any issues during the time we’ve owned it.
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