Odd tip-in hesitation - any help would be appreciated!
First off, I'm not usually the type of person to ask to be spoon-fed on car forums, but I'm a bit stuck here, very short on time, and very short on money. I'm sorry if this is a basic issue and I'm simply overlooking the obvious. I've search high and low and I can't find anyone having exactly this issue.
Car is a 2007, 193k miles, 2.0L, manual, California emissions, only mod is Injen short ram and this was happening before I installed the intake.
The issue: intermittent hesitation at tip-in when the car is warm. I have no issues with idle at any temperature. The car runs great first thing in the morning and/or after sitting for a while. It also runs great when I'm giving it a high-rpm thrashing. Gas mileage seems normal. The car doesn't feel like it's down on power at all. No check engine light at any point.
Things already done with no difference:
- New plugs
- New upstream O2 (like I said, money's tight or else I would have done all 3)
- Cleaned MAF
- Replaced MAF
- Capped off purge valve
- Disabled IMRC (always open)
Could this be a faulty EGR valve? I'm just trying to think of things that only happen when it's warm. I'm pretty sure that things like the purge valve and EGR valve remain closed until the engine is at operating temperature.
Any help would be appreciated. I've already worked out so many bugs in this car and it's almost perfect. I'm just trying to get this thing 100% soon. My wife and I are expecting a daughter by this time next month and if it's not fixed by then, it may never be, haha.
'07 Mazda 3i
Previously driven by sensible wife, now being modded by gearhead husband. Uh oh...