Pre-cats: The Official MR2-ROC Information Thread

Started by Anonymous, May 16, 2006, 16:01

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roger

Quote from: "demsdad"The Pre Cats are out drove home and have had no problem! Great result and weight off my daughter's shoulders.  Now she can drive without the Pre Cats in the back of her mind.  For anybody in the Maidstone area (or further afield) PM me and I'll give you the details of the gentleman who did it all for £50 incl the gasket.

To everybody who kindly offered advice thanks a lot.

Suggest you copy this (or similar) in to the Companies who do pre-cats in the sticky at the top of this forum
Roger

EX: \'04 Sable + PE Turbo and many other things
NOW: MR2 on steroids - \'12 Merc SLK200 AMG125

Use Spydersearch if you are stuck for information. Please.
Check my fuel consumption

demsdad

Have posted details in the Companies who do pre cats.....

thanks for tip.

AllanE

#52
Please don't use WD40 on or near the O2 sensors.
WD40 is petroleum-based and petrol kills O2 sensors - regularly running (very) rich actually reduces their life.

- I'm currently working up to pre-cat removal; but the garage (temperature) is not being very welcoming at the moment...

Anonymous

Hey folks! First poster here - I'll do an intro later!

I've been looking to get an MR2 Roadster now for a while and will be doing so when I get home (currently working abroad til April). This pre-cat thing is pretty worrying though! I've been googleing like hell to find the Che manifold you've all recommended and have only found this here Is this the one? It seems odd that the only thing to get is from the US...does anyone in UK do a similar line for similar price? I'm thinking Powerflow etc...

Is Delubozparts the place I need to be heading for..? £207 by my conversion...ouch but cheaper than the TRD one I found somewhere else at, like, £800! If it's the guy I need to get hold of to get one, how is he? Delivery time? Reliability etc..?

Also, fitting of aftermarket manifolds/headers. How much? Time? Can any garage do it? I'm notoriously un-technical when it comes to fixing stuff so it'll def be a garage job!

Cheers in advance for the help!

Anonymous

#54
I had a pre-cat failure about two weeks ago, a couple of days after the repair I started to notice a notice from the engine when accelerating. I have been checking the oil level to see if it's burning up witch is normal, and pressure tested the engine, all fine. Checked all exhaust brackets etc, again all fine.
Can anyone help?

muffdan

#55
The noise could be unreleated to the pre-cats so check the obvious things like loose heat shields etc first.

If the noise is related to the dead pre-cat failure, it could be the big ends perhaps  s:( :( s:(  What were the compression results? The material gets into the engine and does all sorts of mischief, particularly the big ends. I'm not sure if a compression test is a good indication of whether any cat material has made it into the engine. Did you change the main cat after the failure?

Jason
Jason
[size=80]\'00 Cape Green MR2 with Hard top, A/C & Leather - SP Turbo - 320bhp[/size]
[size=100]AEM - [/size][size=96]ARP - [/size][size=92]Crower - [/size][size=88]Cusco - [/si

darkday

#56
Quote from: "Cadde"I had a pre-cat failure about two weeks ago, a couple of days after the repair I started to notice a notice from the engine when accelerating. I have been checking the oil level to see if it's burning up witch is normal, and pressure tested the engine, all fine. Checked all exhaust brackets etc, again all fine.
Can anyone help?
What all was repaired? Did you get a new manifold and downpipe? If you didn't get a new manifold/downpipe this engine is probably toast.

Anonymous

#57
I managed to remove the precats from our MR2 yesterday. I was surprised at just how easy it was. No siezed nuts/bolts at all! I did apply a generous amount of penetrating oil the night before though, which I think helped. Whilst I was under there and had the manifold out, waiting for it to dry after pressure washing, I did an oil change, much easier whilst you have the room under there!

Some tips I would add though:
    It's really easy to cross thread the lambda sensors, be extra careful to make sure you are putting in in straight!
    The manifold to block clamps are much easier to get in if you leave the manifold studs very loose, this allows you to line the manifold up on the clamps first.
    You will need those new compression seals that go between the manifold and the downpipe, mine fell apart when I split the two parts.
    Add some copper grease to the plastic undertray screws to make it easier to undo them next time

Now what do I do with the catalytic converter honeycomb? Can I take it somewhere to be recycled?

Oh yes, and one of my precats was beginning to go, there was a region around the tip of the lambda sensor that was mis-shaped. Interestingly, a CEL code P0175 caused me to check it, glad I did!

Chris

Anonymous

#58
Do the pre-cats HAVE to be removed??
The 2002 MR2 I'm soon buying still has its pre-cats intact.
Help much appreciated. =]

Liz

#59
Quote from: "thien_le"Do the pre-cats HAVE to be removed??
The 2002 MR2 I'm soon buying still has its pre-cats intact.
Help much appreciated. =]

They don't have to, obviously that is your decision - but I think if you read this thread as a whole you should come out with the conclusion that it would be prudent to do so.
ex-TTE Turbo, now Freelander Sport, its not a car its a Landrover!

Anonymous

#60
Quote from: "Liz"
Quote from: "thien_le"Do the pre-cats HAVE to be removed??
The 2002 MR2 I'm soon buying still has its pre-cats intact.
Help much appreciated. =]

They don't have to, obviously that is your decision - but I think if you read this thread as a whole you should come out with the conclusion that it would be prudent to do so.


Do all cars have pre-cats? If so, wouldn't they have the same problems then?
Or do they just have the main catalytic converter?

sorry my knowledge in cars is extremely poor.

Anonymous

#61
Not all cars have pre-cats, but all Mk3 MR2s do (unless they have been removed).

Most cars do only have a main cat (at least in the UK), hence you not hearing of pre-cat problems very often.

Chris

Puerco

#62
As a new member, I've been reading the essential stuff.  In particular, I'm most grateful to the contributors to this most important topic.
I've recently bought a Jap import, built in 2001, presumably for the Japanese domestic market.  Is the pre-cat system fitted to ALL MR2 Mk3 models?

Anonymous

#63
Quote from: "Puerco"Is the pre-cat system fitted to ALL MR2 Mk3 models?

Yes.

Anonymous

#64
Hi I purchased a 2000 mr2 last week from a used dealer - since purchasing i noticed a strange noise, took it to a garage they said it was one of the pulleys on the belt.  That has now been replaced, but im continuing to have problems which are getting worse by the day.  Ive discovered its used all the oil that was put in on the day of purchase, there are still occasional strange noises from the engine area (different from the pulley noise) and now when i change gear i can feel it pulling back, kind of losing power. After reading up on this forum this all seems to suggest a pre-cat problem, do you think this is the case?  I am taking it back to the garage tommorow and they have not suggested this before, so I want to be sure I know what im talking about before telling a trained mechanic that i think this is the case! I am no expert on cars whatsoever. Any help would be appreciated. Thanks

muffdan

#65
Tell them about the high oil consumption, tell them the engine is knackered and you want your money back and walk away!

Also get them to remove the two o2 sensors from the manifold and visually inspect the pre-cats, see if they are both still there.

Jason
Jason
[size=80]\'00 Cape Green MR2 with Hard top, A/C & Leather - SP Turbo - 320bhp[/size]
[size=100]AEM - [/size][size=96]ARP - [/size][size=92]Crower - [/size][size=88]Cusco - [/si

Anonymous

#66
thanks for reply jason -the dealer is paying for the repairs though - do u still suggest getting my money back?.  My way of thinking is  if they fix it problem solved. Im in love with my mr2 now so would only go and buy another - which again may have the same problem.

Anonymous

#67
Sarah, the engine is fubar, it is almost definetly pre cat failure. Even if they are willing to put in another engine and replace the main cat, i would still demand a refund.
The car was not fit for purpose.
Plenty more out there, DO NOT keep this car under any circumstances.

DannyN

#68
Quote from: "nelix"DO NOT keep this car under any circumstances.


+1,  most definitely !
Quote from: \"DannyN\"There are 10 types of people in the world,
Those who understand Binary and those that don\'t...

[size=75]Black 51 165 BHP - Hardtop ON - Teins - Apexi Power FC - AEM Induction (Cleaned) - Crower Cams - Forged Pistons - Iridium Plugs - Zero Manifold - SP Downpipe - H&S - TRD SS - Corkys MSMB - Goodridge - \'03 Vents - Devs - Bamas - Crystal Indies - Mongos.
[/size]

Anonymous

#69
oh im dissapointed now I dont want to give it up now I have it! But I know what you're saying it makes sense. Thanks

Anonymous

#70
Quote from: "sarahlr3"oh Im dissapointed now I dont want to give it up now I have it! But I know what you're saying it makes sense. Thanks

Give it up, it's a pile of dog faeces, always some for sale on here, you know then you are buying an enthusiasts car.

DannyN

#71
There are plenty out there, there are even some on here in the private sales section (some of which we actually already know the  history of even)
Quote from: \"DannyN\"There are 10 types of people in the world,
Those who understand Binary and those that don\'t...

[size=75]Black 51 165 BHP - Hardtop ON - Teins - Apexi Power FC - AEM Induction (Cleaned) - Crower Cams - Forged Pistons - Iridium Plugs - Zero Manifold - SP Downpipe - H&S - TRD SS - Corkys MSMB - Goodridge - \'03 Vents - Devs - Bamas - Crystal Indies - Mongos.
[/size]

DannyN

#72
Where are you based and how much ish do you have to spend ?
Quote from: \"DannyN\"There are 10 types of people in the world,
Those who understand Binary and those that don\'t...

[size=75]Black 51 165 BHP - Hardtop ON - Teins - Apexi Power FC - AEM Induction (Cleaned) - Crower Cams - Forged Pistons - Iridium Plugs - Zero Manifold - SP Downpipe - H&S - TRD SS - Corkys MSMB - Goodridge - \'03 Vents - Devs - Bamas - Crystal Indies - Mongos.
[/size]

Anonymous

#73
Im in swansea, wales and if i manage to get a refund then id have about 4000 to spend.  My only problem is I exchanged my car with the dealer - didnt pay a penny out infact they gave me 300 pound back becuase my car was worth more.  Ive rung them 2 days ago, had alot of attitude and they said I could have my car back but would have to pay for repairs they did to it, even though im not aware there was anything wrong with it.

Anonymous

#74
Tell them the car they sold you was unfit for purpose, they either give you your car back or the purchase price of the mr2 you bought. Drop trading standards into the conversation.