Hi Guys,
Car has had ecu reflash by pulse racing in sydney.
Had a bit of a drama last Friday evening causing rough idle and what i thought was a timing (cam timing or ignition) problem which stopped motor from revving comfortably - turned out (I believe) to be a vacuum leak from two split hoses.
In the process of diagnosing, I pulled top half of the inlet (ie not manifold) off.
I also disconnected the 02 sensor off the dump pipe to eliminate a fault with the 02 sensor as the cause - this caused check engine light and cruise control to flash up on my dash, although once reconnected it disappeared. Did this twice to be sure ( slight deterioration in idle when 02 sensor was unplugged which ruled this out as a fault for me I believe)
Also cleaned the afm with contact cleaner (plastic safe) to free up any gunk and rule out afm fault.
Question is this - for the first 2 weeks of having the reflash, car was fantastic on fuel (10.4L\100km according to trip computer) and seemed to boost more freely. Since friday, avg fuel consumption has dropped to 7.9L\100km for the same type of driving. Has my tune been affected by any of my actions?
The three variables I can think of are as follows:
- unplugging 02 sensor whilst running has caused error log which is not clearing (is this possible on these ecu's?)
- I used a full can of heavy duty injector cleaner, which may be thickening the fuel mixture and thus burning slower - causing worse economy \ performance for the tune? Didnt think any such change would be so pronounced though.
- There is still a fault somewhere which was exacerbated by the vacuum leak although is still lurking (ie acvs solenoids or afm fault)
Question is - is it possible for my tune to have been affected by the above? Am i being paranoid or do you guys think this is feasible?
Seems like the car isnt as torquey off boost (or punchy whilst on boost) and is chewing more fuel and doesnt feel like it did before the idle problem on Friday.
I've racked my brain trying to figure it out but its got me done right now.
Thanks in advance for any help.
Mick