SCT X3 Tuner is a POS

**the.palmetto** · 11-22-2009, 10:11 AM

Bought an SCT X3 Programmer and is really pissing me off, I had problems during WOT. I started the program off doing one thing at a time. I tuned to 93 octane from the default of 91 first with no problems. It wasn't until I advanced the timing by two degrees through both RPM bands (2k-4k and 4k+) that I started to have problems.

In 3rd gear at WOT around say maybe 4k RPM's, the car started hesitating and bucking like crazy to where it was not drivable in WOT. I took the timing out and it stopped. I found that no matter what I try to tune in the car that it still does that bucking.

I thought maybe it was my spark plugs, but I changed the plugs and plug wires and STILL have the problem. Is there something wrong with my tuner?? WTF is going on here?

**Larry** · 11-22-2009, 02:08 PM

Just a guess but mine did the same thing you are describing by advancing the timing with HP Tuner with traction control on. Try a pass with the TC button off and see what happens.

**c5z28** · 11-22-2009, 02:17 PM

handhelds are for fords, ditch it get a real tune.

**the.palmetto** · 11-22-2009, 09:09 PM

Originally Posted by c5z28

handhelds are for fords, ditch it get a real tune.

Yea, I might. Hey, where are you from in the Bay Area? I'm originally from San Jose.

**Wesman** · 11-23-2009, 02:50 PM

Have you checked the spark knock signal to make sure you're not getting actual knock?

**the.palmetto** · 11-23-2009, 10:46 PM

Originally Posted by Wesman

Have you checked the spark knock signal to make sure you're not getting actual knock?

To be honest I'm not really sure how to do that.

**Wesman** · 11-24-2009, 09:43 AM

Originally Posted by the.palmetto

To be honest I'm not really sure how to do that.

You will need a scan tool. Either a GM Tech II, Snap on Scan tool (Modis), or software like LS1 Edit or HP Tuners. Autotap Diagnostic will also work, but you'll need the optional GM Parameters addon.