d_benet
New member
Vehicle:
2000 Sport 5 speed 5VZ - 182K miles
2k miles ago (2months) did the whole timing belt, water pump, t-stat, seals, etc and thoroughly cleaned MAF, IAC and throttle body. Replaced all plugs and wires and did all 4 gear oils at the same time. Truck has been running great if not for maybe a very slight loss in fuel economy and throttle response over the last few years. I chalked it up to the old gal getting some grey hairs.
Symptom:
Highway driving 65mph downhill in 5th gear, highway starts to go up a grade so I downshift to 4th before applying more throttle as I let out the clutch. RPM climbs then falls then climbs again as if I were pushing the clutch in and out slightly. I was already planning on my first application of Seafoam (top end spray) today to see if it helped with the grey hair issue. I was very impressed at how well the seafoam worked; initial OBDII data indicates a full 1- 1.5 mpg fuel economy increase driving around town and throttle response feels better. However, I was able to replicate the symptom this afternoon on my sea-foam test-drive, and again only in 4th gear at the same speed.
Diagnostics:
No codes except for running rich (probably from the seafoam). Cleared it, then nothing more and truck is running great. I'm just a bit concerned as I've got a big Baja trip next month and trying to make sure everything is dialed. My initial reaction is throttle position sensor and I just read a bunch of other posts but still not sure how to go about testing it (I'm a noob). If its not that, I'm not sure where else to start. Little help, please.
Thanks
2000 Sport 5 speed 5VZ - 182K miles
2k miles ago (2months) did the whole timing belt, water pump, t-stat, seals, etc and thoroughly cleaned MAF, IAC and throttle body. Replaced all plugs and wires and did all 4 gear oils at the same time. Truck has been running great if not for maybe a very slight loss in fuel economy and throttle response over the last few years. I chalked it up to the old gal getting some grey hairs.
Symptom:
Highway driving 65mph downhill in 5th gear, highway starts to go up a grade so I downshift to 4th before applying more throttle as I let out the clutch. RPM climbs then falls then climbs again as if I were pushing the clutch in and out slightly. I was already planning on my first application of Seafoam (top end spray) today to see if it helped with the grey hair issue. I was very impressed at how well the seafoam worked; initial OBDII data indicates a full 1- 1.5 mpg fuel economy increase driving around town and throttle response feels better. However, I was able to replicate the symptom this afternoon on my sea-foam test-drive, and again only in 4th gear at the same speed.
Diagnostics:
No codes except for running rich (probably from the seafoam). Cleared it, then nothing more and truck is running great. I'm just a bit concerned as I've got a big Baja trip next month and trying to make sure everything is dialed. My initial reaction is throttle position sensor and I just read a bunch of other posts but still not sure how to go about testing it (I'm a noob). If its not that, I'm not sure where else to start. Little help, please.
Thanks
