Markie Posted March 20, 2005 Share Posted March 20, 2005 Hi all, Current situation is that I still have the first CAT on the EXT system at the moment following the MOT. It is usally running with just a restrictor ring in.. Do you think with the CAT in aswell would cause the car running problems? Seems, or feels like the car is misfiring now and again, and sometimes boggs down when the second turbo starts to kick in. Any feedback would be great thanks.. BTW, not planning on running it with the CAT in for long, will return it back to full decat soon, but just wondering if it would cause any problems like mentioned above. Or should I start to look at anything else.. Its very odd as I have just noticed it. And the only thing that has changed is the CAT in and I moved the BLITZ SUS air filter to a different posistion (Nothing drastic, just closer to cold air feed pipe, which involved moving it few inches to the right) Sorry for the long post. Quite worried about this. Link to comment Share on other sites More sharing options...
Nic Posted March 20, 2005 Share Posted March 20, 2005 Under what driving conditions is it mis-firing, WOT, high boost, high rpms? Plugs would be the first obvious culprit, notice you have HKS plugs do you know which model (S35i/S40i/S45i)? A BPU car needs S45i's. Link to comment Share on other sites More sharing options...
Markie Posted March 20, 2005 Author Share Posted March 20, 2005 Don't know what type plugs.. Its seems to bogg down when putting foot down now and again when second turbo kicks in. Also feels like its mis-firing when in a low gear say 5th and going about 40 MPH then accelerating. Link to comment Share on other sites More sharing options...
Markie Posted March 20, 2005 Author Share Posted March 20, 2005 Anyone got any other ideas on why my car is doing this. Surely not down to slightly moving air cone posistion.. Bit of a worry. Hope its down to the CAT still being attached. Would re-set of ECU cause a problem also? Link to comment Share on other sites More sharing options...
Jake Posted March 21, 2005 Share Posted March 21, 2005 Do-Luck Front Bumper/Veilside Skirts/TRD Spoiler/Defi Gaugues/Volks Racing GTN 18" Splits/HID Headlight Conv/UK Brake Calipers With Brembo Discs/Blitz SUS Induction/TDI Carbon Cold Air Box/Blitz LM Front Mounted Intercooler/HKS Iridium Plugs/Greedy TI Exhaust/HKS Front Pipe/Whiffbitz Second CAT Bypass/Blitz SBC-ID Boost Cont/HKS FCD/HKS Turbo Timer/Bee-R Rev Limiter/Racelogic Traction Control/RPS Streetmax Clutch/B&M Short Shifter/HVS Hot Earth System/TDI Uprated Fuel Pump/Cusco Strut Brace Don't know what type plugs. Read your Sig then! Try changing the plugs for a start and then let us know if the problem persists. Link to comment Share on other sites More sharing options...
Markie Posted March 21, 2005 Author Share Posted March 21, 2005 Cant see why its suddenly the plugs when its started to happen recently after its been running totally fine. I am mainly after an answer as to whether the CAT left on might cause a problem like this or whether I have to look into something else gone or playing up. Link to comment Share on other sites More sharing options...
Whitesupraboy2 Posted March 21, 2005 Share Posted March 21, 2005 Whats Jake is saying suttly that one of your plugs may be breaking down. So replace them How many miles you done with those plugs? but i think others on here recommend different plugs.....but i may be wrong! Link to comment Share on other sites More sharing options...
tbourner Posted March 21, 2005 Share Posted March 21, 2005 Depends how willing you are to change them. Took me 2 hours to do mine the first time!!! If you're alright with it then get some NGKs and whack them in quickly. Have you reset the ECU? If you've put the cat back in after having full decat and not reset it you should do this first. Link to comment Share on other sites More sharing options...
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