Phazer Stumble

[gibb73]

I'm going through a similar issue right now.....it would surge and buck at approx 5000rpm...but only at a specific throttle position. Above and below that it would be fine...and it didn't throw any codes. It felt like the spark was cutting in and out. Found a loose exhaust clamp....installed new gaskets and still happening. Checked the tps in the ECM diagnostic (great feature to have!) and the tps would jump around a lot when I hit approx 40 in the diagnostic....below or above that it was totally fine. If I tapped it with my finger while holding the throttle at 40, it would drop to 0 then move around. I took the tps out....I had a tiny bit of oil around the pins in the tps....cleaned it out with some contact cleaner. Numbers in the tps diagnostic are steady now....gonna put it back together and test! Just in time for the rain here The sensor may or may not last...for $240 from the dealer I'll try this first!

 

[maim]

well just fixed the stumble on mine. wire was almost broken through on the coil plug. had to re solder it. running like a champ now.

 

[2stroken]

So I a recap of mine, I changed plugs last year and that didn't seem to help. After that, I checked the calibration of the TPS(saw nothing wrong), but I did put some grease on some electrical(fuel injectors, TPS connector etc). I was not able to test it out again last year after that. I had the loose bolt starter issue which required complete removal of the front. After that was fixed, took it on a 1-1.5 hour ride and after the ride it clicked that I didn't see any stumble. So I would suspect it was the cleaning of the connectors last year that fixed it, as the removal of the starter really didn't do anything other than I had already done.