General backfiring :(

[hayley202]

Hello, all day today my 1.2 bravo has been juddering quite badly, its been doing it for a while now and again, but today has been worse. Just come back from shopping and on the way there i had the window open. The car started juddering as normal in second/thrid gear at about 2000 revs and then BANG!! i thought i had been shot at Wasn't til i stopped crapping my self that i heard it again and realised it was coming from the exhaust. Any ideas anyone as im gonna end up giving some poor old soul a heart attack

 

[richcinq]

Either the timing is out or you have a ignition problem. I see you are in Kent-where abouts are you?

Rich

 

[hayley202]

Hi, im in Gillingham. When the juddering starts im 100% sure that when i turn the car off, it will not start again until its cooled down, which Jud has said is to do with the Lambda Sensor which i am getting hopefully sometime next week. The backfiring is new to me today

 

[richcinq]

Snap! I am in Gillingham too-near the sava. It sounds like you could have a coil pack problem-although the backfireing could be related to the lambda sensor so would be worth seeing if fitting one helps. Where you getting the work done?

Rich.

 

[hayley202]

My hubby's gonna do it. If he gets stuck his mate owns a garage near the high street and said to shout him if need be.

 

[richcinq]

OK

I am pretty handy with Fiats so you can give me a shout if you have problems as you are so local. As I said best to fit the lambda sensor and see if it cures the backfireing before doing anything else.

Rich.

 

[fenton_jd]

Sounds like a misfire, check ignition leads for damage/not on properly. or check coil packs/replace.

Juddering would usually mean running off 3 cylinders, so yeah id check the above

 

[hayley202]

Excellent, cheers for that Hubbys good with fords, vauxhalls etc but never had the privilege of working on a fiat!! He is getting used to it though, not had much luck with this one!! lol

 

[richcinq]

Juddering Doesn't always mean you are running on three as with that you would have a lack of power with it and it wouldnt backfire. A weak spark from tired coil packs is a more feasable answer for the juddering and the backfire means either a lean mixture(lambda fault) or the timing is out.

 

[jug]

it does sound like a lack of ignition could be the issue. coils, leads and plugs need checking and replacing if in doubt. a multimeter can be used to check the condiiton of the coil pack, make a comparison of both coil resistance readings (take both LT and HT reading for each coil) to decide if one is dying.