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[portomega]

My car failed its Mot on the emissions test, so the garage advised me to put in some Redex and take the car for a drive to hopefully sort out the emissions. Came back they fitted a new mid section and back box to the exhuast (£400!   ) and it then passed the MOT.
But.........since then ive noticed the engine seems to run rougher and my MPG are now pretty poor (between 24-26mpg when it used to be 27-30 mpg) a friend said it was something to do with the Redex removing the cardon from the engine. Just wondering if anyone else has trouble after using these typesof products?  

[Seth]

I'm assuming that you have a petrol-powered job.
I'd say that your consumption figures are pretty normal, especially with it being an auto.
How are you calculating your MPG?

[portomega]

yeah its a 2.2 petrol auto, im just going by what its shows as my mpg on the trip computer

[Seth]

I'm assuming that you have a petrol-powered job.
I'd say that your consumption figures are pretty normal, especially with it being an auto.
How are you calculating your MPG?

Hmmmm, just thinking - is the car performing the same as before the Redex treatment?
And what make exhaust was fitted - I'd imagine that at this price it was a genuine Vx system.

[portomega]

No its performing slightly worse than before the Redex, like i say my mate said something about it removing the cardon from the engine. im not sure if the exhaust is a Vx part as i had it fitted at euromaster, seems to be just a cheap (looking) exhaust, plus its rattling like hell so it could not be fitted properly, would a badly fitted exhuast affect the MPG?

[Seth]

yeah its a 2.2 petrol auto, im just going by what its shows as my mpg on the trip computer

I've found that the only accurate way of checking, is to fill the tank to the brim, and run it around. Then similarly refil and work it out from there.
As an aside, my old Carlton 2.0 CDX averaged 27/28mpg locally, (pretty good I thought), though the computer showed significantly higher consumption.

[Seth]

No its performing slightly worse than before the Redex, like i say my mate said something about it removing the cardon from the engine. im not sure if the exhaust is a Vx part as i had it fitted at euromaster, seems to be just a cheap (looking) exhaust, plus its rattling like hell so it could not be fitted properly, would a badly fitted exhuast affect the MPG?

'PM' me with your phone number - something's not right here.

[portomega]

ive tried working out mpg before but never seem to get it right lol
 im hoping once ive refilled the tank a few times that could flush out the redex from the system, never trusted these addative things and wat they clam, wish id not used the stuff now.

[Freypal]

Someone correct me if i'm wrong but isn't the removal of carbon only really a problem with tired old engines where the build up created a better seal. On a new/modern engine i can't see it affecting it.

[Del Boy]

They did a test on fith gear before showing that things like redex reduce performance by up to 5 %  

[Seth]

Not disagreeing with the foregoing posts, but I reckon the replacement exhaust is certainly not helping here.
Regarding the Redex, the 'original' variety is, I reckon, nowadays all but redundant. Modern fuels and oils have additives which prevent excessive carbon build-ups. More likely that Redex injector cleaner was used as an aid to reducing the emission level for the MoT.

[jonathanh]

Not disagreeing with the foregoing posts, but I reckon the replacement exhaust is certainly not helping here.
Regarding the Redex, the 'original' variety is, I reckon, nowadays all but redundant. Modern fuels and oils have additives which prevent excessive carbon build-ups. More likely that Redex injector cleaner was used as an aid to reducing the emission level for the MoT.

i agree with you.  It would not be the first time that someone has botched a 2.0 onto a 2.2 either.  Next step would be to inspect the exhaust - check the make and part number and confirm it is right for the vehicle.  If i am correct the 2.2 has two mid sections not 1 (the 2.0 has one) - the original post talks about a new mid section and end....

[Seth]

Not disagreeing with the foregoing posts, but I reckon the replacement exhaust is certainly not helping here.
Regarding the Redex, the 'original' variety is, I reckon, nowadays all but redundant. Modern fuels and oils have additives which prevent excessive carbon build-ups. More likely that Redex injector cleaner was used as an aid to reducing the emission level for the MoT.

i agree with you.  It would not be the first time that someone has botched a 2.0 onto a 2.2 either.  Next step would be to inspect the exhaust - check the make and part number and confirm it is right for the vehicle.  If i am correct the 2.2 has two mid sections not 1 (the 2.0 has one) - the original post talks about a new mid section and end....

My thoughts exactly Jon.
I'm thinking that the replacement exhaust is either cheapo or the incorrect spec for a 2.2, and therefore restricting the gas flow.

The same 'experts' tried to give me some crap boll**s a while ago regarding wheel camber. The work was that bad that I refused point blank to pay-up.

I note that our fellow OOF-er has been charged top whack, so I'd be back there pretty sharpish - and looking for compensation too!

[portomega]

thanks for the replys folks, i guess a dodgy exhuast replacement can affect the cars performance then? its rattling really badly when im stopped in traiffc and have the car in "drive" , sounds like its either hitting the bodywork somewhere or its loose. I guess its a trip back to the garage when i get a chance for them to re-do a bad job

[jonathanh]

ok but before you go backto them, get your info together.  If not you'll be fobbed off

first, have a nosey under the car, look at the manufacturers name on the exhaust and pick off the part numbers: ususally they are stamped into the metal so easy to read.  Then have a google around to see the manufacturers catalogue: check whether the parts fitted are applicable to your vehicle.  If they are not then your case is completely clear.

also check your invoice, this should specify the parts (scan it and post here???)

If they are the right parts, they are fitted badly - again complain is in order

Remeber the 2.2. should have two mid boxes and one back

for £400 you could buy a full VX exhaust for a V6 so you've paid top whack!