Catalytic woes
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From: Los Angeles
Catalytic woes
Good afternoon guys... I own a 2009 XK with approx 30k miles on it. It’s well maintained, upgraded the complete exhaust with Velocity 200 cell stainless steel cats and complete stainless Larini club sport exhaust. I’ve noticed a strange smell during hard acceleration and a sluggish return to idle response. I’m suspecting clogged cats but I’ve had them less then 10k miles. Any thoughts?
Good afternoon guys... I own a 2009 XK with approx 30k miles on it. It’s well maintained, upgraded the complete exhaust with Velocity 200 cell stainless steel cats and complete stainless Larini club sport exhaust. I’ve noticed a strange smell during hard acceleration and a sluggish return to idle response. I’m suspecting clogged cats but I’ve had them less then 10k miles. Any thoughts?
Mine failed completely at 7500miles less than a year since I got them
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From: Los Angeles
Hey Many! I think I mentioned to you the potential issues with high flow cats , as I have had. Can you easily take them off to see inside ? If you had an r car there is an easy way to tell if they are getting clogged by monitoring boost, on your might have to take a peek inside the actually cats
Mine failed completely at 7500miles less than a year since I got them
Mine failed completely at 7500miles less than a year since I got them
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From: Sydney, Australia
Bad thorough boost ?? As in you believe they are overly restricted as in clogged ?
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From: KINGSVILLE, ONTARIO
I keep blowing a 430 code , swapped O2's around and still 430 so they are fine, trying to eliminate things , if you can tell you have a bad cat through boost gauge I could do this? But what am I looking for.
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I can almost guarantee melted cats. There is a lot of junk out there, even name brand cats can and will fail especially behind supercharged/turbo charged engines. There is a reason some cats cost $90 and others $500. Stock or none is best in almost all cases.
Well you need to log boost at wide open throttle in second gear for example. You simply compare it to stock or what your stock boost should be. Any restriction in exhaust will cause boost spikes. For example when my catsmelted boost went up by 2 psi
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2008 XKR Convertible, (mods: AlphaJagTuning ECU Tune , 1.5lb pulley, (200cel cats( are now melted), xpipe, Bosch 001 pump, 180 Thermostat.
Drag strip : 7.9sec 1/8mi 90 MPH . 1/4 mile 12.55 at 112.98mph
432rwh Dyno on Mustang Dynometer , Approx 511 crank HP.
2013 XJ 5.0 SC (Alpha Jag ECU, TCU tune, crank pulley), 600+ HP, 11.6 sec 1/4th mi 122mph, 7.6sec 1/8th mi
2018 Jaguar F-Type (AlphaJag ECU TCU, lower upper pulleys intake) 10.77 ,131mph ,700hp
2008 XKR Convertible, (mods: AlphaJagTuning ECU Tune , 1.5lb pulley, (200cel cats( are now melted), xpipe, Bosch 001 pump, 180 Thermostat.Drag strip : 7.9sec 1/8mi 90 MPH . 1/4 mile 12.55 at 112.98mph
432rwh Dyno on Mustang Dynometer , Approx 511 crank HP.
2013 XJ 5.0 SC (Alpha Jag ECU, TCU tune, crank pulley), 600+ HP, 11.6 sec 1/4th mi 122mph, 7.6sec 1/8th mi
2018 Jaguar F-Type (AlphaJag ECU TCU, lower upper pulleys intake) 10.77 ,131mph ,700hp
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From: Kaysville, Utah, US
I don't know what my boost is supposed to be, so that's no help.
What I DO know is that if the downstream O2 sensor looks alpha wavey like the upstream does, your cat is probably toast.
What I DO know is that if the downstream O2 sensor looks alpha wavey like the upstream does, your cat is probably toast.
Last edited by AlexJag; Aug 14, 2020 at 03:19 PM.
I look at logs all the time so can probably spot it better. I look for boost spikes outside of normal for that particular engine . I have logs from different customers cars to compare to. I would need mid to 100,% load at WoT to look at . Another tip on a sign of clogged catalytic converter is sound, usually the exhaust becomes quieter the more catalytic converters are clogged
__________________
2008 XKR Convertible, (mods: AlphaJagTuning ECU Tune , 1.5lb pulley, (200cel cats( are now melted), xpipe, Bosch 001 pump, 180 Thermostat.
Drag strip : 7.9sec 1/8mi 90 MPH . 1/4 mile 12.55 at 112.98mph
432rwh Dyno on Mustang Dynometer , Approx 511 crank HP.
2013 XJ 5.0 SC (Alpha Jag ECU, TCU tune, crank pulley), 600+ HP, 11.6 sec 1/4th mi 122mph, 7.6sec 1/8th mi
2018 Jaguar F-Type (AlphaJag ECU TCU, lower upper pulleys intake) 10.77 ,131mph ,700hp
2008 XKR Convertible, (mods: AlphaJagTuning ECU Tune , 1.5lb pulley, (200cel cats( are now melted), xpipe, Bosch 001 pump, 180 Thermostat.Drag strip : 7.9sec 1/8mi 90 MPH . 1/4 mile 12.55 at 112.98mph
432rwh Dyno on Mustang Dynometer , Approx 511 crank HP.
2013 XJ 5.0 SC (Alpha Jag ECU, TCU tune, crank pulley), 600+ HP, 11.6 sec 1/4th mi 122mph, 7.6sec 1/8th mi
2018 Jaguar F-Type (AlphaJag ECU TCU, lower upper pulleys intake) 10.77 ,131mph ,700hp
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Posts: 11,890
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From: Kaysville, Utah, US
Can do an oxygen drop-down test to check the cats. See how long the downstream takes to react to input from STFT changes. Cats should follow 6-10 seconds behind, manifested in the downstream O2 sensor graph.
But back to WHERE'S my Upstream sensor? It's not listed as supported in Torque. The OTHER bank's sensor is there and operates.
But back to WHERE'S my Upstream sensor? It's not listed as supported in Torque. The OTHER bank's sensor is there and operates.
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