I'm having a problem with my MR-2; it basically feels like it's hesitating under wide open throttle high up in the rev range (5k+) - It almost feels like you come off the throttle and back on very very quickly. I'm also averaging about 15MPG, even though I'm staying below 3k RPM.
It's running quite rough - the throttle feels like it's an on off switch when you're trying to maintain speed, as a by product it's lacking a bit in response too. The car also feels down on power. At idle the car feels smooth - I've looked at the engine and it's not vibrating in an untoward manner at all and it sounds as it should.
So Far I have:
- Changed the HT Leads
- Fitted a new distributor cap & rotor arm
- Changed the Coil & Igniter
- Checked the HT Leads to ensure a good spark is getting through
- Read the fault codes [Nothing Codes were stored]
- ECU Reset
Yesterday I fitted a new distributor cap & rotor arm, checked all the leads over and reset the ECU. I fired the car up and went for a 10-15 minute drive. During this time, the car was fine although I kept the revs down below 3k as you generally do in normal driving. But the response was back and the engine felt much smoother. However, when the car was warmed up I engaged Wide Open Throttle in second gear and the hesitation cut back in at 6k. For the rest of the drive the car was back to how it was before. I've been unable to get the car back to this stage since - despite another ecu reset today it's still hesitant and pants on fuel.
I have read on here that it may be the oxygen sensor and that I should remove it to see how it reacts. How should it react if this is the fault, and precisely where is the oxygen sensor?
Does anyone have any ideas what the fault could be and how to rectify it?
Thanks for any assistance