VY V6 Dyno check

[VY 777]

Hi Guy just wondering if any of you have a solution or a similar problem with your car. I have a 2003 V6 ectec auto from new with 90,000Km. I have a couple of mods to the motor, Pacemaker extractors and a 2.5 inch cat back system, K&N air filter & cold air intake from side of air box down and standard intake. Any way I took the cars to be Dyno the other day and found the engine was running to lean & pinged @ 4500rpm. I was told so many different things I done know where to start to fix this problem.
I came home & a friend dropped around to see if the car was pinging. In neutral the car revved smoothly throw the whole range even at 6 grand. Then we took it for a drive keeping it in first gear we sat on each thousand rev and held it there and listened. 1,2,3,4,5,6 grand no ping.
Is there a chance that when it was on the dyno the exhaust sensor they inserted in the tail pipe could have caused: back pressure. ( & would that make it ping?) or the other reasons put to me were, 1, Air flow meter not working properly. 2, Need new mamcal chip or flash $1300.00. 3, Flue filter blocked? The car feels great & runs great I just wanted to see if I could get any more power not to find problems. I also have a stock VY Equip V6 with 130,000km on it in excellent condition, when you drive the 2 you can feel the difference the mods have made. If any one as an idea's I would be greatfull.
Cheers VY 777

[0081]

try cleaning the maf first, as you might have some oil from the k&n filter on it

[impulsesv6]

could be a faulty o2 sensor on the dyno.


not the first time it would have happened

[VY 777]

Thanks for the info I will check & clean the unit, see how it go's!
Cheers Col

[OZ38]

Thanks for the info I will check & clean the unit, see how it go's!
Cheers Col

Make sure you use the CO Contact cleaner as it wont hurt plastics etc. I think CRC even make a spray for MAF cleaning now (probably just CO contact cleaner renamed )

Also don't touch the sensor wires with your hands.

Cheers

Deek

[dynoman]

If it is a automatic and the dyno operator pulled the trans fuse to lock in 3rd gear I know on VS & VT V6's it takes power away from the MAF causing the problems you described.