dantwomey Posted March 2, 2010 Report Share Posted March 2, 2010 For the last few months I've been having an issue with my truck that I can't figure out. The symptoms are dramatically reduced mileage (about 25% less) and about 10-15% more throttle required to do everything at light loads. When I'm driving around town light acceleration seems to take slightly more throttle and and I hear the intake growl all the time now. My favourite slight grade going up the street to my home use to be light throttle all the way up. Now it's alittle more throttle and a downshift. It's almost like I'm pulling a small trailer around and the truck is loaded down. On the other side of things full throttle performance doesn't 'seem' to be affected. One of the reasons I posted this is I just found out today a loud rattle I've had for about the same amount of time is inside one of my cats. My Loud Rattle This I've done lately to try and fix this: New Air Filter Cleaned MAF and TB New plugs and wires New fuel filter My truck has only 50,000 miles on it so I'm alittle annoyed. Thoughts anyone? Regards, Dan Quote Link to comment Share on other sites More sharing options...
alex.t Posted March 2, 2010 Report Share Posted March 2, 2010 if you have a bad cat that could be robbing power. Quote Link to comment Share on other sites More sharing options...
Fireman31 Posted March 2, 2010 Report Share Posted March 2, 2010 I think you already have your answer, the rattle you hear is a degrading cat, which can drastically reduce the driveability and efficiency of your truck. This isn't something you should let go, I would fix it ASAP..... Quote Link to comment Share on other sites More sharing options...
dantwomey Posted March 2, 2010 Author Report Share Posted March 2, 2010 I think you already have your answer, the rattle you hear is a degrading cat, which can drastically reduce the driveability and efficiency of your truck. This isn't something you should let go, I would fix it ASAP..... The next step then...............the GM cat will probably be $500 or more (just guessing but I'll know tomorrow) so let's talk Magnaflow or SLP high flow cats. Any suggestions? Regards, Dan Quote Link to comment Share on other sites More sharing options...
Fireman31 Posted March 2, 2010 Report Share Posted March 2, 2010 Your factory cats are warrantied 8 years/80,000 miles by Federal mandate, are you under that guideline? Quote Link to comment Share on other sites More sharing options...
zachm89 Posted March 2, 2010 Report Share Posted March 2, 2010 (edited) your stock cats may still be under warranty...go tot he dealer and tell them to change them out. ^^^what he said...darn you for beating me by a second! haha Edited March 2, 2010 by zachm89 (see edit history) Quote Link to comment Share on other sites More sharing options...
dantwomey Posted March 2, 2010 Author Report Share Posted March 2, 2010 I'm in Canada so we'll see if the same rules apply. Regards, Dan Quote Link to comment Share on other sites More sharing options...
dantwomey Posted March 2, 2010 Author Report Share Posted March 2, 2010 Many thanks!!! It's under warranty and the dealer didn't tell me. If I was closer to you guys I'd buy you a beer. Regards, Dan Quote Link to comment Share on other sites More sharing options...
dcairns Posted March 2, 2010 Report Share Posted March 2, 2010 (edited) That warranty is only good if they can't blame the problem on any engine mods you have. (been there, lost that battle and GM wanted $1400 to replace them ). I bought some used cats from a member here who was getting rid of his cats. Also Random Technology makes a good high flow cat. In any event, get it taken care of soon, if they are plugging up, it can damage your engine. Edited March 2, 2010 by dcairns (see edit history) Quote Link to comment Share on other sites More sharing options...
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