Hey all,
I've been a member and lurking for about a month now since I purchased a 2007 Tahoe 2LT with just over 34k miles. It currently has about 37k miles. I've installed a K&N FIPK and a Hypertech Max Energy programmer. I found slight power gains and slight improvement in MPG, but I was really happy with the programmer's ability to adjust the rev limiter, shift points, and tranny firmness. I was able to pretty much get rid of the problem of the thing falling on it's face at full throttle on the 1-2 shift (due to the 4L60E's steep first gear and fairly shallow 2nd gear along with the torque management). I raised the shift point up 200-300 RPM and increased the tranny shift firmness and now it's pretty snappy shifting and is higher in the torque band at the low end of each gear so it pulls way stronger all the way through the gears.
Anyway, since I bought the thing, it randomly (once a week or so) will crank for an abnormally long time (roughly 3 seconds). This has occurred before and after the K&N and programmer. Of course, the long cranking could be due to the typical clogged injectors or dirty fuel filter, but with only 37k miles? Should I just try some fuel injector cleaner and see if that works? It is NOT a flex fuel vehicle (even though the idiot salesman told me it was). Luckily, I have personally never used E85 in it but what damage would/could it have done if the previous owner did? Could this be related to the long cranking?
My final question... I bought the vehicle at a local Chevy dealership and it's GM Certified Used. I have a warranty until 75k miles. If I need warranty work done, I realize that I need to program the thing back to stock, but should I worry about putting the stock air intake system back on? Or can I leave the K&N FIPK installed if I take it into the dealership? Are they going to throw a fit and refuse to do warranty work if they see it on there?
Thank you for your help.
Cheers,
Ben
I've been a member and lurking for about a month now since I purchased a 2007 Tahoe 2LT with just over 34k miles. It currently has about 37k miles. I've installed a K&N FIPK and a Hypertech Max Energy programmer. I found slight power gains and slight improvement in MPG, but I was really happy with the programmer's ability to adjust the rev limiter, shift points, and tranny firmness. I was able to pretty much get rid of the problem of the thing falling on it's face at full throttle on the 1-2 shift (due to the 4L60E's steep first gear and fairly shallow 2nd gear along with the torque management). I raised the shift point up 200-300 RPM and increased the tranny shift firmness and now it's pretty snappy shifting and is higher in the torque band at the low end of each gear so it pulls way stronger all the way through the gears.
Anyway, since I bought the thing, it randomly (once a week or so) will crank for an abnormally long time (roughly 3 seconds). This has occurred before and after the K&N and programmer. Of course, the long cranking could be due to the typical clogged injectors or dirty fuel filter, but with only 37k miles? Should I just try some fuel injector cleaner and see if that works? It is NOT a flex fuel vehicle (even though the idiot salesman told me it was). Luckily, I have personally never used E85 in it but what damage would/could it have done if the previous owner did? Could this be related to the long cranking?
My final question... I bought the vehicle at a local Chevy dealership and it's GM Certified Used. I have a warranty until 75k miles. If I need warranty work done, I realize that I need to program the thing back to stock, but should I worry about putting the stock air intake system back on? Or can I leave the K&N FIPK installed if I take it into the dealership? Are they going to throw a fit and refuse to do warranty work if they see it on there?
Thank you for your help.
Cheers,
Ben
