Strange Speedometer / Cruise Control Problem

**jimhollis** · 03-10-2014

I have a 2004 GT2 and am having a strange problem. When I set the cruise on lets say 70 (pick a speed really) it constantly tries to adjust itself so I end up with a steady slowing down and speeding up thing going on. To see if this was isolated to the cruise, I turned the cruise control off and held the speed steady at 70 and noticed that the speedometer would randomly jump down 2-3 mph and then jump back up to 70. Needless to say, this is frustrating and annoying. Looking for what could be causing the problem...any suggestions would be greatly appreciated.

**Fivefingerdeathpunch** · 03-10-2014

I wonder if the throttle body is really gummed up and dirty and causing some minor issues.

Not sure if it will help but it's worth a try, so clean the throttle body and MAF sensor with there correct cleaners and see if anything changes.

**jimhollis** · 03-11-2014

Thanks. Yeah, the throttle body was pretty nasty so I pulled it off and cleaned it. Haven't pulled and cleaned the MAF yet...that is on for this afternoon.

**jimhollis** · 03-12-2014

MAF all cleaned but didn't help the cruise. In fact, it straight up died last night.

**jimhollis** · 03-27-2014

Well...found the problem and it's not good news unfortunately. The vibration ended up being the torque converter. Have it scheduled to be replaced next week. The question is...should I go ahead and have my mechanic do a rebuild on the transmission while he has it out of the car? Car has 160,000 miles. I'm leaning toward yes...but haven't decided 100%.

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