removed cats, now problems
02-22-2011, 07:53 PM
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removed cats, now problems My 2002 WS6 recently got qtp longtube headers, no cats, true 3 inch dual exhaust exiting at factory points, new plugs at .50, new gm gaskets and im having problems.
first was the SES light, i expected that but its been stuttering in all rpms, wont accelerate properly. its an automatic and its backfiring quite a bit.
its drives normally when its cold but when it warms up, the problems begin. I live at 4000 ft, use 91 octane. i removed the PCM to send to TSP so they can do a tune for me.
im pretty sure its just waay to rich because of a combination of no cats, altitude and 91 octane. right?
first was the SES light, i expected that but its been stuttering in all rpms, wont accelerate properly. its an automatic and its backfiring quite a bit.
its drives normally when its cold but when it warms up, the problems begin. I live at 4000 ft, use 91 octane. i removed the PCM to send to TSP so they can do a tune for me.
im pretty sure its just waay to rich because of a combination of no cats, altitude and 91 octane. right?
02-22-2011, 07:55 PM
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I have been there before, CHECK FOR VAC LEAKS!!! Scan that code....loose AIR or EGR fitting and you will have a vac leak. Does the car backfire at all? Could always be a bad maf. Scan the code and get back to us.
Car will run fine with bolt ons and no tune, it just wont be OPTIMAL.
Car will run fine with bolt ons and no tune, it just wont be OPTIMAL.
02-23-2011, 08:45 AM
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Screams vac leak to me. Two big things to check: make sure your plug wires are on the plugs and NOT melted by the headers, inspect each one of them! If that looks ok, I would buy some carb cleaner and spray around the engine bay, if the idle hiccups and raises a bit you found your leak. I bet you have a 'lean on bank x' code or EGR code. Please check the easy stuff, I thought my car had a busted MAF, ended up being a super easy vac leak.
02-23-2011, 04:50 PM
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did you at lease put the 2 front O2 sensor back one the headers, the rear one's are not as important they are only there to monitor the effeciency of the cats, they do not affect drivability
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02-26-2011, 01:27 AM
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