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View Full Version : Toyota Momment: stuck throttle, Renix, line pressure cable


GregGA
April 26th, 2012, 16:44
87 4.0, AW4

Good evening everyone,

I adjusted my line pressure conduit per the FSM, and took her for a spin.
Applying WOT in o/d, the transmission downshifted beautifully and the
throttle stuck wide open. The line pressure cable connector(plastic) had
broken. At least we can shut down our Jeeps by turning off the ignition,
unlike Toyota:roflmao:

Still drives fine, shifts fine. I am tired, and no I have not searched what
the function of the line pressure cable is. I have learned a ton from this
forum, so if anyone would like to inform me, and has the time, I would
appreciate it. If not, I can search and learn more tomorrow.

I am betting the broken connector can't be bought seperately, so that means a new cable and pulling the transmission pan etc. I might just buy
the parts on this one and let a garage with a lift do the job.

Any information and insight on this is appreciated. I am just glad my wife
wasn't doing the test driving. This is the first time I've had a throttle stick open, and it gives you a little pucker:laugh:

Thank you!

Greg

8Mud
April 27th, 2012, 07:40
I'd take a look at the coil spring on the throttle plate axle. IMO the throttle really shouldn't stick open without the TV cable being hooked up.

The TV (my guess is "T"ransmission "V"alve cable) controls (bleeds excess) pump pressure and as a dual function downshifts into passing gear.

What you don't want is way soft shifts, that let the clutches slip too much.

GregGA
April 27th, 2012, 15:31
Thank you 8Mud. Not sure if it broke at WOT, but it was hooked up before.
I'll check out the spring.

I enjoy your posts and knowledge!

Greg

GregGA
April 27th, 2012, 15:48
Spring looks ok. Now that I am more rested from yesterday, it really makes
no sense how the connector breaking could keep the throttle open. There doesn't seem to be a way it could jam the linkage after it broke and became
disconnected.

I wish I could remember what it looked like when I opened the hood. I was
running late to work and noticed the broken part, and moved the linkage.

I'll check floor mats etc for binding. Maybe it was one of those weird conclusions you jump to when "assuming" you know the cause. If I discover anything, I will post it up.

Thanks again, 8MUD!