Engine won't rev past 2k RPM

[ronnie4]

Well, finally got my Supra running, with a hitch anyways.

When in neutral the engine will rev past 2K with no problem, but when in drive it will stop at 2k and kick back down to 1500 in any gear. It's almost like it in a "valet mode".

Any suggestions?

Thanks in advance

 

[Nick M]

Sounds like fuel cut to me. Is the TPS plugged in good?

 

[ronnie4]

Sounds like fuel cut to me. Is the TPS plugged in good?

Will double check it? Can it fuel cut when low on fuel? Gas light is on.

 

[CRE]

Can it fuel cut when low on fuel? Gas light is on.

No.

 

[kHaNg]

unless ur on low fuel and going down a hill?

 

[Nick M]

unless ur on low fuel and going down a hill?

It wouldn't restart at 1500 RPM.

 

[CRE]

unless ur on low fuel and going down a hill?

Ok, I suppose that might be similar enough of a feeling to confuse the two, but if the car continues to run regularly below 2K... it's usually not "being out of gas".

But, since you mention the light is on.... why not add a gallon or two and see if it runs fine then???

 

[ronnie4]

Update: Cleaned the TPS connector and put some gas it it, didn't help.
Rev's fine in neutral and when I run the car for the first few mins. After that it craps out.

Here's a video of what it's doing. Any help would be appreciated, I'm stumped.
http://www.youtube.com/watch?v=9YZPuEw3arc

 

[jetjock]

Looks like decel fuel cut to me. I assume it does this even with the pedal buried. The IDL contact in the TPS is staying closed. The way to quickly confirm it is to go into diagnostic mode and with the key on and engine off press the gas pedal. You should see a code 51. If you don't then that's the problem. You could also try running the engine with the TPS unplugged. It the problem goes away or behaves differently that's the problem. If it remains the wiring is bad. Do the code 51 thing first though.

edit: wait...you say it revs OK in neutral? Never mind. You should still check for codes though.

 

[ronnie4]

Yeah I was pedal to the metal during that video. I got a little time to mess with it today and unplugged the TPS. Fixed the problem, but not it idles at 2500, is the only way to adjust the idle speed by rotating the TPS?

 

[Nick M]

Idle speed isn't adjustable. But it is "adjusted" by having TPS out of adjustment, timing, dash pot adjusted too far out, that is about all I can think of.