Ringo_Mountbatten Posted May 9, 2003 Share Posted May 9, 2003 I've just developed a couple of, what seem like, nasty problems on my escort 1.8i mk6. Firstly, there was a really nasty rattle coming from underneath the car after i'd stopped revving it, and during gear changes etc. It turns out that my catalytic convertor was knackered and had come away from the front exhaust box, the rattle was just the cat rolling around! Anyway, i still haven't got round to fitting a new front box and since then i've developed another worrying problem. For some reason, when i hit about 3k revs the car just seems to lose all power (well, it stays at the same rpm level more or less, perhaps a slight increase) and doesn't want to accelerate any further. It's hard to describe properly, but if you rev it hard enough it feels like there's something being sucked in somewhere that's just stopping it from getting any faster. I'm pretty certain it's not the clutch, the performance is just the same up until the 2.5-3k mark but then the engine just starts getting really noisy, like i've got a sports and exhaust and induction kit! Shame it just doesnt want to pull anymore! Could it be related to the exhaust problem? Will fitting the new exhaust fix this problem too? Any help much appreciated. Link to comment Share on other sites More sharing options...
scott_d Posted May 9, 2003 Share Posted May 9, 2003 sounds like a flat spot!!! try taking off the air filter an see if it goes! does it gain power again after 3k revs or wont it go any higher? Link to comment Share on other sites More sharing options...
Ringo_Mountbatten Posted May 9, 2003 Author Share Posted May 9, 2003 No, it just finds it hard to get any higher than 3k! It does gradually get higher but it just doesnt gain anymore power really and it gets really loud. Could it be due to lack of back pressure from the exhaust or something? After all, the exhaust is knackered. Link to comment Share on other sites More sharing options...
escygti Posted May 9, 2003 Share Posted May 9, 2003 i had the same problem on mine the cat was knackered, i replaced it and all was ok, Link to comment Share on other sites More sharing options...
Ringo_Mountbatten Posted May 9, 2003 Author Share Posted May 9, 2003 Ah right, it's just strange how a knackered cat can affect the peformance so much! Thanks for your help! Link to comment Share on other sites More sharing options...
Dean-o Posted May 9, 2003 Share Posted May 9, 2003 the rattle was just the cat rolling around! as much as i hate cats i dont think its fair to shove a cat underneath your cari think the rspca wud have summat to say about this Link to comment Share on other sites More sharing options...
Al Posted May 9, 2003 Share Posted May 9, 2003 Let the pussy out...........and all will be well! Al. Link to comment Share on other sites More sharing options...
Ringo_Mountbatten Posted May 10, 2003 Author Share Posted May 10, 2003 Is there an easy way of just removing the cat? i know it's illegal but i could do with a bit of extra power . surely the only way is to like cut open the front box, but wouldnt it be a nightmare to put the front box back together? Link to comment Share on other sites More sharing options...
ShaneW Posted May 10, 2003 Share Posted May 10, 2003 if your cats cream crackered, get it removed, then ask a nice person the cut of the mounting plates of each end of the cat and weld them onto a piece of stainless steel, you then have a decat pipe. use this until mot time, you now have two choices, find a sympaphetic mot station that will pretend they didnt notice, or fit a working cat, then swap back to decat pipe after the test. Link to comment Share on other sites More sharing options...
mr_wigster Posted June 5, 2003 Share Posted June 5, 2003 Hiya mate. The problem could be caused by the damage to the cat as the HEGO (Hot Exhaust Gas) sensor is mounted on the downpipe. The change in back pressure can cause this to feed wrong readings to the engine management, which, in turn, limits the maximum possible RPM. Try fixing the exhaust first and see if the problem vanishes. Hope it helpz... Wigster. Link to comment Share on other sites More sharing options...
DanSi16v Posted June 5, 2003 Share Posted June 5, 2003 the lump of cat causing ur ratteling noise is quite likely geting lodged in the exhaust thus reducing the amount of exhaust gasses exiting the exhaust Link to comment Share on other sites More sharing options...
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