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[kevrottie]

The other day i got in the car started it up and could notice the exhaust note was not the normal note !! i drove on regardless 2 miles later under load i heard a loud hiss and the exhaust sounded like it had shot a gasket i turnd round and went home parked the car up let her cool down so i could have a look any way 5 mins late i find a rubber pipe had split its the link pipe that links the two pipes together its located above the alternator i changed the pipe and drove on only to still have the irregular exhaust note under load and agen 2 miles away the pipe let go !! has any one ever had this problem its on a 3l v6 1995 !!!is it egr or something else

[rpont]

That's an air injection pipe, the EGR pipe and valve is up above the exhaust and goes into the side of the plenum.

You have exhaust from one side going round to the other side due to a blockage, probably a blocked cat. The rubber is only supposed to take air that is being injected, not hot exhaust gasses.

[kevrottie]

i did say i think lol so whats the damage and is it an easy fix

[Marks DTM Calib]

Blocked exhaust or cat.......drop the cats off and check them by blowing through them....

[kevrottie]

ok so if they are not blocked what then

[Marks DTM Calib]

....then repeat the test on the centre sections (with the cat off you can blow throguh them whilst on the car).......

One of the four is blocked and hence why the rubber coupler failed....start on the drivers side first......

[kevrottie]

thanks for that i shall go out and try it shouldnt be two hard as its ss from the cats back thanks agen ill keep you posted

[kevrottie]

ok ive been getting all the tools etc which i need to drop the cats and check for blockages ! what could be blocking flow through the cat and is a new cat the answer to the problem ??also before i do go to the lenghts of removing the cats could my problem be a result of anything else!!

[Marks DTM Calib]

Pretty much nothing else can cause this problem......

Cats are generaly very reliable unless the engine is over fueling or they have impact damage......are you running any other mods?

[kevrottie]

It is definatly the driverside cat that is blocked ! left it ticking over for ten minutes 2day on the ramps got so i could see if there was a noticable difference in temps in the 2 cats and there was the exhaust pipe coming out of the passenger side was too hot to touch were the driver side is stone cold its booked in wednesday to be decated something i should have done when i had the ss exhaust 5 months ago it is standard apart from a few minor mods though i have uprated panel filter and modded airbox and intake the ss exhaust and has been running fine the cat seems to look fine but it has got a dent so who knows hope the decats do the trick

[JamesV6CDX]

It is definatly the driverside cat that is blocked ! left it ticking over for ten minutes 2day on the ramps got so i could see if there was a noticable difference in temps in the 2 cats and there was the exhaust pipe coming out of the passenger side was too hot to touch were the driver side is stone cold its booked in wednesday to be decated something i should have done when i had the ss exhaust 5 months ago it is standard apart from a few minor mods though i have uprated panel filter and modded airbox and intake the ss exhaust and has been running fine the cat seems to look fine but it has got a dent so who knows hope the decats do the trick

Don't do it

You'll never pass an emissions test without Cats....

[Marks DTM Calib]

And it might well lower the performance....

[kevrottie]

problem is now cured !! had both cats removed today and what a difference in performance it has made! yes i do have the fact that to pass an mot the cats will need replaceing but thats no problem to bolt up 2 new cats come mot time the only downfall i can fins is the extra noise but it doesnt half sound good so i can easily put up with it its no louder than standard under normal driving conditions it will be intresting to find out if the power gains are infact gains but i have new suspension to fit nxt month and then it can go on the rollers to find out !!