car backfires when i get on it

[HyperGSX]

when i floor it its backfires and shakes when towards upper rpms. Is it time for a plug/wire change or is it something else? it never used to do this unless it was wet outside, now its all the time

 

[pnklmnd]

check for boost leaks...everywhere...the throttle body leaks between the tb elbow and the tb. the BISS leaks sometimes between the tb and intake mani......check you bov aswell i did a boost leak test tonight on a friends car that has the type s it was leaking from the screw on the top the vaccum line fitting and the gasket between his hardpipe and bov......

id change your wires aswell cant hurt make sure if you do the plugs aswell they are gapped properly .028-.032......

 

[93jdmlaser]

Are you running to rich possibly. My car ran to rich before and I would breakup in the upper rpms.

 

[JKGMotosports]

pnklmnd check for boost leaks...everywhere...the throttle body leaks between the tb elbow and the tb. the BISS leaks sometimes between the tb and intake mani......check you bov aswell i did a boost leak test tonight on a friends car that has the type s it was leaking from the screw on the top the vaccum line fitting and the gasket between his hardpipe and bov......

id change your wires aswell cant hurt make sure if you do the plugs aswell they are gapped properly .028-.032......

I believe it is a boostleak as well, check if your intercooler pipes are intact properly.

 

[HyperGSX]

yes i am running very rich, my car shoots out black smoke occasionally So i should hold off on the plugs/wires ?

 

[prophecy7115]

my car did the same and shot smoke in between shifts.. very wierd but when i changed the plugs and cables the backfireing stoped and the smoke in between shifts stayed but minumized.... different cars different setup i would recommend to check both. never can be too shure


Ivan

 

[JKGMotosports]

Just check for boost leaks, this is the most common problem. If it is not a boost leak than go for your plugs and wires.

 

[JKGMotosports]

Another thing is don't VENT your BOV, recirculate it, that way your car will run in the best condition.

 

[HyperGSX]

well installed a new bov b.c. the factory one leaks anyways. well the backfiring is worse now, i know i have a leak somewhere.

 

[Spoolin4Ever]

Well on my car, it was "cutting out" at high boost levels. It was the plugs. But it was NOT backfiring, it would just studder on high boost. It was the plugs. Then I switched out the wires for good measure. Have you ever done the plugs and/or wires since you have owned it? If so, when??

Inspected your ECU? Do 2G ECU's get leaking capacitors like 1G's??

 

[HyperGSX]

i did plugs and wires about 30k ago, i'll look into that also.