Bucking/surging at around 40 MPH
07-02-12, 08:21 PM
#18
1JZ Single SC400
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Did you try disconnecting the maf sensor? Rule that out also. try to oull the efi fuse in the fuse bix under the hood. leave out for two minutes then put back in. will reset the computer.
07-03-12, 02:13 PM
#21
just to help, I think I might film the surging just so you guys know what it's doing. Don't know when I'll be able to get to it, but it will be soon cuz I'm gonna unplug MAF and DRIVE! see if it makes a diff.
Thanks everybody, I'll keep you posted.
Thanks everybody, I'll keep you posted.
07-09-12, 10:00 AM
#23
I UN-plugged the EFI fuse and drove it. There was no thunking or surging that I remember, but I'll try again anyway.
I think, though, that it could be the TPS, since sound travels, it doesn't really mean it's the tranny that's causing all this surging crap. The Throttle position sensor is the "brains" behind the idle, because when I have the A/C on, it doesn't idle too badly, but if I have no A/C on, it runs like the 92 Ford Explorer I drove home (which was running on 4 cylinders FYI)
Help again???
I think, though, that it could be the TPS, since sound travels, it doesn't really mean it's the tranny that's causing all this surging crap. The Throttle position sensor is the "brains" behind the idle, because when I have the A/C on, it doesn't idle too badly, but if I have no A/C on, it runs like the 92 Ford Explorer I drove home (which was running on 4 cylinders FYI)
Help again???
07-15-12, 08:20 AM
#27
Fixed.
TPS was bad, and throttle bolt was completely loose.
thanks all
(still a little surge but will be relieved once motor mounts are outta there, how do you check them?)
cheers
*EDIT* I had put the TPS in without calibrating it. You must set it to spec with an ohmmeter which would be 0:00, or infinity, which means an open circuit. Once I set the TPS to spec, it started bucking and surging LIKE CRAZY, that's when I thought it could be the o2 sensors, since they are the feedback of air vs fuel ratio via exhaust. Once I replaced bank 1 and 2 o2 sensors, bucking and surging went away. Keep that in mind...
TPS was bad, and throttle bolt was completely loose.
thanks all
(still a little surge but will be relieved once motor mounts are outta there, how do you check them?)
cheers
*EDIT* I had put the TPS in without calibrating it. You must set it to spec with an ohmmeter which would be 0:00, or infinity, which means an open circuit. Once I set the TPS to spec, it started bucking and surging LIKE CRAZY, that's when I thought it could be the o2 sensors, since they are the feedback of air vs fuel ratio via exhaust. Once I replaced bank 1 and 2 o2 sensors, bucking and surging went away. Keep that in mind...
Last edited by SC400slide; 03-05-13 at 11:27 AM. Reason: Added info
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