Popping on overrun

[caver]

Heres the situation.
2005 ute, Short headers and dual 76mm exhaust no cats,K&N filter.

On overrun as injectors kick back in around 1500rpm some backfiring takes place in the exhaust.

Any body had this, any ideas on how to get rid of it?

[wait4me]

Is your Airpump on when this is happening? Unplug it and see if the poping goes away?

[joecar]

"Overrun" as in deceleration with closed throttle..., is that what you mean...?

Backfiring into exhaust on deceleration may be due to grossly retarded spark timing.

[SSbaby]

I had my car popping after I had an exhaust fitted by the same guy who did my tune. The tune was crap! AFRs were extremely lean - 13.7 (measured on dyno) and the engine pinged badly at 5,000rpm. Once the exhaust 'carbonised' and the PCM richened the mixture up on relearn, the problem alleviated itself. :?

[caver]

I changed all the minus timing numbers in the minimum timing map to 0's hav'nt had any feedback from the customer yet. Will have to call him I suppose

[GMPX]

I changed all the minus timing numbers in the minimum timing map to 0's hav'nt had any feedback from the customer yet. Will have to call him I suppose

I've added in some DFCO spark tables, they will be in the final installation version of V7.3

Cheers,
Ross

[joecar]

If there's no feedback from the customer, then either he's not running it, or it's working just fine (...that's how customers are... :lol: ).

[caver]

]If there's no feedback from the customer, then either he's not running it, or it's working just fine (...that's how customers are... [/quote]

Dont I know it.
Did another car today and it seemed to be better.
Had him breathing over my shoulder and irritating me as he is From far away and arrived early.
Dual 76mm system will always burble a bit so I am not too stressed about it.

[GMPX]

Had him breathing over my shoulder and irritating me as he is From far away and arrived early.

:x :x :x
What can you do?.

Cheers,
Ross