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Daul fuel gq backfireing on petrol

Posted: Tue Oct 20, 2009 11:35 am
by bcrheat
Hi there,
I have a 93Gq 4.2 EFI running on dual fuel. Had been having a problem with it not running on petrol due to severe backfireing.Running fine on gas.
Tracked it down to the airflow metre which I replaced with a new genuine one. Truck has been running great for 3months but now since the other day it has started doing it again. Exactly the same as before. Can only run truck on petrol with airflow metre diconnected or it just keeps backfireing.
They reckon I cant get warranty on the air flow metre as they reckon its on gas and backfireing has caused this. They think there must be some other problem with it.
Any help on this problem would be great.
Thank you

Posted: Tue Oct 20, 2009 5:37 pm
by MyGQ
does the gas go in before or after the airflow meter???