gti mk2 91

[dubsweeper]

anyone in wa i could speak too about my car !!

[Jmac]

Mate we are from all over and there is plenty of people on here more than willing to help mate. Whats up with ya Dub mate?

[dubsweeper]

hi mate just latley my car is back firing when i go through the gears when i give it acceleration the injectores have been serviced , a new k/n filter with the inside taken out of the airbox , any suggestions, cheers

[anarchycamp]

I might be totally wrong here but if your filter is sucking up more air it might be causing the car (ECU) to run rich and therefore back firing, dunno, some of the more technical guys here will help im sure

[dubsweeper]

yeah thats what i was thinking to i might put the stock filter back in and wait till i get a free flow exhaust system

[peedman]

usually with backfiring the problem lies with the spark plugs or leads. did it start to happen recently? when were the last time they were changed?

[dubsweeper]

can i buy spark plugs that have been set for this model ?i have not done leads for two years and i cant find any record in my paper work,i should change them i reckon

[delta|triangle]

Hey dubsweeper, I'm from perth

out of interest which mechanic do you normally use?

[dubsweeper]

joe at golfwagen has done most recent stuff like gearbox and injectors.

[86gti]

Some AFMs (air flow meters) don't like aftermarket filters.
Not familiar with the AFM on the Bosch system in the mk2, but im pretty shure they are a bit like the nissan Vane type ones.
you can pop the black top off them and add a bit more tension to the spring to compensate for the increased airflow.
Blugs and points will cause intermitant firing thru the rev range.
if its back firing between shifts etc, its more than likely a fuel/Air delivery problem, steming from the AFM
Try you old filter set up and see if it stops doing it first tho.

[Jmac]

Guys lets not get confused with backfire and afterfire. Backfire is generally in the engine and manifolds and afterfire is in the exhaust. Where is your back fire/afterfire ? If your exhaust has a leak any unburnt fuel in the exahust will ignite hence the bang. This fuel is ignited by heat and the o2 entering the exhaust. Usually a over rich system will do that. If the engine is backfiring then you may be running lean, vac leak manifols leak or yes the K/N. I had a KN cone on mine and a chip was ok . Without the chip your Air/fuel ratio is out of whack. Pull off the vac pipe on the fuel pressure reg and blank the pipe off and run the car and try. This will tell you she is lean mate.
Cheers

[dubsweeper]

yeah will go back to the other filter and put the inside thingys back in the air box as you said it is a bosch afm and looks like its been taken off ! anyways im going up bush for a few weeks and leaving it with a mechanicand they can put a stainless exhaust on and do other mods and come back for a surprise (early krismas)