back firing

[macka_21]

Well as the title states my ss is back firing.. i have noticed it happening around 1500 revs in 4th gear but its not consistent as it will do it once and a while so im asking if anyone else has had this problem and can shed some light as how to fix it..

I have done the following:

changed leads
changed spark plugs ( bought 4 electrode bosch platnium plugs)
im getting a fuel pressure and flow test done on friday and getting the fuel filter checked/ replaced if required
i have been told that my o2 sensors are fine

any other things to check

im going to a second mechanic today to get another diagnostics test to see wat error codes come up, but all i can say is it is starting to annoy the f*%k out of me

[johnnyk]

what's the spark plug gap of the new plugs?

are you running on LPG or petrol?

might also be worn ignition module(s)... :\

let us know how u go!

[Macka21]

There bosch platnium 4 electrode plugs and petrol

[Not_An_Abba_Fan]

Back firing is over fuelling, which usually means a miss. The coils can die, is it missing at idle or just when cruising?

[Macka21]

Just at cruising and my coils are working properly and my injectors are fine

[Macka21]

Wat do u mean spark plug gap and how do i check it

[Macka21]

Well had a pressure and flow test done and everything is like brand new changed the fuel filter but its still back firing and not running right

[macka_21]

is there any other ideas as to wat it could be my last resort is a tune

[Not_An_Abba_Fan]

Check the plugs again, it isn't uncommon to crack one when putting them in. The old ones could have been failing anyway when you changed them.

[Macka21]

I put them in hand tight then did one turn with the socket

[Not_An_Abba_Fan]

They can still crack.

[sweefu]

They need so little tightening, maybe it was 22mm last time I did plugs? Use a torque wrench to ensure you don't over tighten.

[Macka21]

Ok ill give it a check

[Not_An_Abba_Fan]

They need so little tightening, maybe it was 22mm last time I did plugs? Use a torque wrench to ensure you don't over tighten.

No, they are 5/8".

All it takes is the plug socket to be on a bit of an angle and when you do the final tighten, it can crack the ceramic.

Other than that, you may have a faulty plug.

[macka_21]

well this morning i got a check engine warning and my traction control turned off and wouldnt let me turn it back on? any ideas why this has happened

[Not_An_Abba_Fan]

Could be unrelated, may be a faulty wheel sensor. But if the car is missing and back firing, it could be causing it.

[macka_21]

wat would be causing it to miss tho

[Not_An_Abba_Fan]

A cracked or faulty spark plug?

[macka_21]

will that show up in a diagnostic scan?

[Not_An_Abba_Fan]

No. But since the engine light has come on, it should have set a code, so that may tell you what that problem is.

[macka_21]

sweet getting another scan done at 3 does it have to be a tech 2 scan tool or any will let me no

[macka_21]

well i have tried everything so all i can think is maybe my tune has gone up the shitter

[jay_dee91vy]

mate i had the same problem but in my s pac.. u said u got new leads.. take the silver metal cap with the spring on it of all the leads that connect to the plugs they can pop the lead off the plug if that dosnt work take the leads off at the coils nd check that the connection inside the leads is nice nd tight.. u said ur coils wer fine how did u check this??? also a trick i learnt from a friend hold ur mod nd set button turn ur key 3 times as far as u can before turning the engine on.. this will bring up another set of options and also any error codes that u can google.. btw if u change ur plugs so all 8 not just 4 keep everything the same... hope u find ur problem mate

[Macka21]

A scan tool checked my coils and said they were working

[Macka21]

Took the silver caps of the leads and still the same and there no error code withthe mode and set buttons being held and wat do u mean inside the leads how do u check that