Precat removal - How I did it...

Started by GSB, April 14, 2004, 09:10

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GSB

#50
Quote from: "mr-s_turbo"I'm sure that manifold i had looked like the pre cats were slightly dished, by this i mean the centre looked higher than the sides, convex rather than concave.(i think)

If you have mine yet, take a look at it and see can you?

Will do  s:wink: :wink: s:wink:  as soon as I pick it up. Cheers Ian!
[size=50]Ex 2001 MR2 Roadster in Silver
Ex 2004 Facelift MR2 Roadster in Sable Grey
Ex 2007 Mazda 6 MPS in Mica Black
Current 2013 Mazda MX5 2.0 \'Venture Edition\' Roadster Coupe in Brilliant Black[/size]

Anonymous

#51
As my 60,000 service is due soon, I booked the car in for the end of May whilst I was getting the summer tyre fitted today.

I asked about an end of warrenty inspection and an inspection of the pre-cats. The receptionist looked at me and said she would recommend getting rid of the pre-cats as it causes engine damage, and that they currently had an MR2 in with motor damage caused by the pre-cats.

I guess I will get them to do it during that service.

Anonymous

#52
Interesting, but was it really a receptionist?

SteveJ

#53
Quote from: "victor"As my 60,000 service is due soon, I booked the car in for the end of May whilst I was getting the summer tyre fitted today.

I asked about an end of warrenty inspection and an inspection of the pre-cats. The receptionist looked at me and said she would recommend getting rid of the pre-cats as it causes engine damage, and that they currently had an MR2 in with motor damage caused by the pre-cats.

I guess I will get them to do it during that service.

Can you smuggle a tape recorder in with you and get that on tape please  s:twisted: :twisted: s:twisted:

Anonymous

#54
thats very good then if toyota have properley recognised the problem and are coming clean about it. would be nice if all dealerships offered 'free pre-cat removal' on all mk 3 2's even the ones out of warranty like mine   s:( :( s:(

Anonymous

#55
Quote from: "phil4"Interesting, but was it really a receptionist?

Most definatly, but very knowledgeable. She could tighten my nuts anyday   s:wink: :wink: s:wink:     s:twisted: :twisted: s:twisted:

Quote from: "SteveJ"Can you smuggle a tape recorder in with you and get that on tape please  s:twisted: :twisted: s:twisted:

Can you understand German ?

Quote from: "Tomr2"thats very good then if toyota have properley recognised the problem and are coming clean about it. would be nice if all dealerships offered 'free pre-cat removal' on all mk 3 2's even the ones out of warranty like mine   s:( :( s:(

Toyota UK and Toyota Germany being different companies may have a different list of "problems". In anycase I doubt it will be free.

GSB

#56
Quote from: "Tomr2"thats very good then if toyota have properley recognised the problem and are coming clean about it. would be nice if all dealerships offered 'free pre-cat removal' on all mk 3 2's even the ones out of warranty like mine   s:( :( s:(

Well, one receptionist in a dealership in Germany reckons they might be a bit dodgy... It falls slightly short of the recognition we'd like but it's a start I suppose.  s:wink: :wink: s:wink:
[size=50]Ex 2001 MR2 Roadster in Silver
Ex 2004 Facelift MR2 Roadster in Sable Grey
Ex 2007 Mazda 6 MPS in Mica Black
Current 2013 Mazda MX5 2.0 \'Venture Edition\' Roadster Coupe in Brilliant Black[/size]

Anonymous

#57
 s:!: :!: s:!:  DRIFT  s:!: :!: s:!:  

it was the same receptionist that told me about the MR2 TTE Turbo about 1 month before you had a mention of it on this site!

Beck to topic

markiii

#58
Quote from: "da monkey"the monkey is now (pre) catless, MAF sensor cleaned and ECU reset - the 2 is now a different car   s:D :D s:D  
just to say thanks for the write up and hey if a monkey can do it anyone can  s:lol: :lol: s:lol:

so what do you find different?
Gallardo Spyder<br />Ex Midnight Blue 911 T4S<br />EX VXR220<br />Ex Custom Turbo 2001 Sahara Sun MR2 Roadster 269bp, 240lbft<br /><br />MR2ROC Committee 2002 - 2009<br /><br />

loadswine

#59
Whichever way you look at it, the message has got to be remove the precats. It would be the right thing to do for MrT(that title sounds a bit too honourable sometimes) to own up to the problem and fix it for all owners.
Also going back in the thread a little bit, has anybody else noticed the shape of the surface of the precat on the engine side? I am sure it looked dished slightly in the centre under the ends of the O2 sensors.If it has worn or broken up in that fashion its incredibly even,both sides identical, and if this is failure, I might as well throw my engine in the bin!  s:shock: :shock: s:shock:
No Roadster any more, Golf 7.5 GTi Performance

Liz

#60
My Mr T service manager called me today about more new wheels for the car, I told him to have a look at these threads regarding the pre-cat failure as he said he had no knowledge...are you reading this Andy!!?
ex-TTE Turbo, now Freelander Sport, its not a car its a Landrover!

Tem

#61
Quote from: "Liz"I told him to have a look at these threads regarding the pre-cat failure as he said he had no knowledge...

Sounds just like Toyota...a while ago I told my friend to take his car in, cause the other precat was cracked. He took it to the same dealer who handled my blown engine and they just kept saying they nor Toyota have never heard of this problem before...

Later on we heard about 3rd case that had been there before me  s:roll: :roll: s:roll:  

I bet all Toyota employees have Alzheimers, cause they wouldn't lie to a customer, would they?  s:twisted: :twisted: s:twisted:
Sure you can live without 500hp, but it\'s languishing.

GSB

#62
Addendum:


Regarding the manifold to main cat gaskets. They are indeed a use once design. The new gaskets measure 5mm thick, and once installed are crushed down to 4mm.

As a safety measure against future seizure of the studs, I coated them in Kluberpaste HEL 46-450, a dry screw lubricant and anti-sieze compound thats good for 1000 deg C. It's made by Kluber Lubrication, but I'm not sure if its generally available to the public, so if theres ever a "de-cat" meeting I'll bring some along with me.
[size=50]Ex 2001 MR2 Roadster in Silver
Ex 2004 Facelift MR2 Roadster in Sable Grey
Ex 2007 Mazda 6 MPS in Mica Black
Current 2013 Mazda MX5 2.0 \'Venture Edition\' Roadster Coupe in Brilliant Black[/size]

Anonymous

#63
Now, a "de-cat" meeting sounds VERY good. I like that idea...........

Anonymous

#64
me too! hope it happens...

Anonymous

#65
Quote from: "markiii"
Quote from: "da monkey"the monkey is now (pre) catless, MAF sensor cleaned and ECU reset - the 2 is now a different car   s:D :D s:D  
just to say thanks for the write up and hey if a monkey can do it anyone can  s:lol: :lol: s:lol:

so what do you find different?


louder exhaust but think i need to get a new main to cat gasket   s:oops: :oops: s:oops:  as per GBH hee hee  s:lol: :lol: s:lol:   i mean GSB
but def better low down torque/acceleration - could be removal of restrictive precats?? but probably cleaning of MAF but either way i is a happy monkey   s:lol: :lol: s:lol:  as car goes better and have no worries re engine failure due to precat degrade

Anonymous

#66
Quote from: "da monkey"
Quote from: "markiii"
Quote from: "da monkey"the monkey is now (pre) catless, MAF sensor cleaned and ECU reset - the 2 is now a different car   s:D :D s:D  
just to say thanks for the write up and hey if a monkey can do it anyone can  s:lol: :lol: s:lol:


but def better low down torque/acceleration - could be removal of restrictive precats?? but probably cleaning of MAF but either way i is a happy monkey   s:lol: :lol: s:lol:  as car goes better and have no worries re engine failure due to precat degrade

I think you have  more torque everywhere (I have). I have a 6 speed gearbox (2003 model), and before , it was just an overdrive. Now it is a real gear.
  I noticed also an improvement in max. speed on 6 gear.

Anonymous

#67
would be interesting to see a before and after dyno results...

the sooner we have this de-cat meet, the better!   s:lol: :lol: s:lol:

Anonymous

#68
QuoteAlso going back in the thread a little bit, has anybody else noticed the shape of the surface of the precat on the engine side? I am sure it looked dished slightly in the centre under the ends of the O2 sensors.If it has worn or broken up in that fashion its incredibly even,both sides identical, and if this is failure, I might as well throw my engine in the bin!

Mine are destroyed now, but I don't remember the engine sides being dished at all.  They appeared flat like the bottom end.  But this is for a US spec, and I've noticed in the photos here that the exit end of the precats seems to be closer to the bottom of the header, so maybe we have different precats altogether.

GSB

#69
Quote from: "mr-s_turbo"I'm sure that manifold i had looked like the pre cats were slightly dished, by this i mean the centre looked higher than the sides, convex rather than concave.(i think)

If you have mine yet, take a look at it and see can you?

I just took a look inside, and they look pretty flat to me. remarkably good condition too, how long were they on your car?
[size=50]Ex 2001 MR2 Roadster in Silver
Ex 2004 Facelift MR2 Roadster in Sable Grey
Ex 2007 Mazda 6 MPS in Mica Black
Current 2013 Mazda MX5 2.0 \'Venture Edition\' Roadster Coupe in Brilliant Black[/size]

Anonymous

#70
Didn't pay that much attention, just thought they looked dished from memory.  s:? :? s:?  

They were on the car for about 7k miles. That was enough for me to dump it and go turbo.  s:wink: :wink: s:wink:

Anonymous

#71
Quote from: "victor"
Quote from: "SteveJ"Can you smuggle a tape recorder in with you and get that on tape please  s:twisted: :twisted: s:twisted:

Can you understand German ?


Kein problem   s:mrgreen: :mrgreen: s:mrgreen:    s:mrgreen: :mrgreen: s:mrgreen:    s:mrgreen: :mrgreen: s:mrgreen:    s:mrgreen: :mrgreen: s:mrgreen:   immer her damit....

Peter Laborne

#72
Quote from: "victor"it was the same receptionist that told me about the MR2 TTE Turbo about 1 month before you had a mention of it on this site!

 s:!: :!: s:!:  DRIFT  s:!: :!: s:!:  

Victor

If you remember, I first found out (officially) that TTE were developing a turbo for the Roadster back in July 2002. Though at the time they hadn't finished building the first one   s8) 8) s8)

loadswine

#73
Tried to gut my precats today and mega problem with one of the 14mm nuts at junction of manifold to main cat pipe.It totally will not budge,used penetrating fluid in abundance and good quality socket set,but nut is now burred and I'm completely snookered. Looks like I'll have to reassemble it and drive with my fingers crossed all the time. I hate working on exhausts!!!  s:x :x s:x
No Roadster any more, Golf 7.5 GTi Performance

GSB

#74
If you go to an exhaust centre, they will extract it for you for a small fee, and you can then temporarily replace it with an M10 bolt for the journey to the Toyota dealer where you can get a new stud and nut, then back home for cat gutting and tea...
[size=50]Ex 2001 MR2 Roadster in Silver
Ex 2004 Facelift MR2 Roadster in Sable Grey
Ex 2007 Mazda 6 MPS in Mica Black
Current 2013 Mazda MX5 2.0 \'Venture Edition\' Roadster Coupe in Brilliant Black[/size]