Engine Mechanical problem
2004 Mazda 6 6 cyl Automatic 48k miles
I have a stock 2004 Mazda 6 sport wagon (48k) that is missing/ hesitating in certain situations. It started about three weeks ago and I noticed it only when cruising in 5th gear and giving it just a little bit of extra gas in order to get up a hill or to merge. It seems to do it in other gears now and usually at or below 2k rpm.
When I put the car in it’s semi-manual mode, I usually like to shift between 3-4k and the problem is not evident there, but when in automatic, the car will be in 5th, travelling 40 or even slower, and at or below 2k rpm- it is then when I apply a moderate amount of gas that the stuttering and often bucking will take place. I’d never noticed before the problem started but that seems a bit low MPH and RPM to stay in 5th? Anyway...
I have tried a few things like running 44k and Seafoam through the tank which did not help. I then did an oil change, air filter change, MAF sensor cleaning ( I was later told a "˜no-no’) that seemed to at least change the “feel" of the problem but it was still there. I partly attributed the change in feel to the fact that I disconnected the battery and thus the computer was relearning...
I then changed my plugs (not wires). While the manifold was off I put an inline PCV valve in to accommodate a faulty one. I looked at the EGR stem and wanted to cut it but stopped short and instead just cleaned it.
I reassembled and took it out on the road and was happy to find my problems were gone. I was feeling pretty proud of myself for about 2-3 hours of driving time when "˜BOOM’! Back with a vengeance was the stuttering and hesitation and now some missing at idle thrown in now and again. I have not scanned for codes and haven’t had any CEL (unless the bulb is out). The dealer wants $100 for a scan and I went to a local garage and they said, “No CEL? No codes. Don’t bother with a scan."
I’m hoping I might get some ideas about where to look next... Throttle body?
Monday, December 1st, 2008 AT 8:28 PM