nurkvinny Posted February 27, 2011 Report Share Posted February 27, 2011 Here's a fun one. Let's say you're idling down your driveway one sunny day in a higher horsepower car. While still at an idle, the car decides that it would rather be turning 5500+ rpms and do a burnout in your gravel. This wasn't a case of being at a high rpm and the car sticking there, like a stuck throttle cable. The car went to WOT by itself. The question is, what in God's name can I check for this one? I have never seen or heard of this. And yes, I was fucking scared. Quote Link to comment Share on other sites More sharing options...
Doc1647545523 Posted February 27, 2011 Report Share Posted February 27, 2011 Classic floor mat failure. Consult your local Toyota dealer. Or, have NASA investigate. Quote Link to comment Share on other sites More sharing options...
Patterson Posted February 27, 2011 Report Share Posted February 27, 2011 Broken return spring, or throttle shaft? Quote Link to comment Share on other sites More sharing options...
V8 Beast Posted February 27, 2011 Report Share Posted February 27, 2011 I'm with Doc. Grab your user manual, or go to the back of the car annd look for this.. http://ecomodder.com/blog/wp-content/uploads/2009/01/20070514-toyota-logo.jpg J/K did it only happen once? I heard of a few issues with tunes where the idle would be wierd while in reverse. But I dont think that would be enough to cause a 5500 rpm surge. Cable, pedal, spring, stuck plate???? Quote Link to comment Share on other sites More sharing options...
hot_wire Posted February 27, 2011 Report Share Posted February 27, 2011 Similar issue: Started my car one day and rather than idle it decided to bounce off the rev limiter until I turned it off. New throttle body fixed the issue, but I don't know if your electronic systems would be quite like mine (saab). Quote Link to comment Share on other sites More sharing options...
nurkvinny Posted February 27, 2011 Author Report Share Posted February 27, 2011 J/K did it only happen once? I heard of a few issues with tunes where the idle would be wierd while in reverse. But I dont think that would be enough to cause a 5500 rpm surge. Cable, pedal, spring, stuck plate???? Happened once the VERY first time I was ever behind the wheel idling in reverse down my drive. I figured I just hit a patch of ice with the bald drag radials and the brakes didn't hold the car, or I hit the gas with my boots (pedals are VERY close together). That was putting the car into the garage to make some non-related repairs. Today's incident was the second time ever behind the wheel, this one in a forward gear. So, that's two times in a row, batting 100%. Of note - both times the car was in a gear. It seems to idle for a few minutes without revving through the roof when in Park. Some details: Older Ford 302, non-stock throttle body, non-stock everything really. Quote Link to comment Share on other sites More sharing options...
Browning Posted February 27, 2011 Report Share Posted February 27, 2011 something wrong with that tb Quote Link to comment Share on other sites More sharing options...
Dave1647545494 Posted February 27, 2011 Report Share Posted February 27, 2011 could be a bad iac motor Quote Link to comment Share on other sites More sharing options...
V8 Beast Posted February 27, 2011 Report Share Posted February 27, 2011 Thats wierd. I would say weak spring but I'm going to assume you already tested the TB. maybe iac like Dave said. Quote Link to comment Share on other sites More sharing options...
Browning Posted February 27, 2011 Report Share Posted February 27, 2011 your ninja skills need some work My ninja skills dwarf yours.... grasshopper Quote Link to comment Share on other sites More sharing options...
V8 Beast Posted February 27, 2011 Report Share Posted February 27, 2011 your ninja skills need some work My ninja skills dwarf yours.... grasshopper quoted for ninjaness.. highlight for maximum effect Quote Link to comment Share on other sites More sharing options...
Browning Posted February 27, 2011 Report Share Posted February 27, 2011 lmao Quote Link to comment Share on other sites More sharing options...
nurkvinny Posted February 28, 2011 Author Report Share Posted February 28, 2011 Verified gas pedal movement, no binding. Strong return spring rate, nothing in its way. The only odd thing I can find is that the inside of the TPS looks all buggered up. Quote Link to comment Share on other sites More sharing options...
Brendon Posted February 28, 2011 Report Share Posted February 28, 2011 It wasn't funny til' afterwards, right? Quote Link to comment Share on other sites More sharing options...
KillJoy Posted February 28, 2011 Report Share Posted February 28, 2011 the inside of the TPS looks all buggered up. Replace it? KillJoy Quote Link to comment Share on other sites More sharing options...
nurkvinny Posted February 28, 2011 Author Report Share Posted February 28, 2011 It wasn't funny til' afterwards, right? I know you're just joshing, but it still isn't funny to me. Still freaked out about it, really. Besides almost crashing the car, I about took out my detached garage, Ram, and S10. I think if I had been on pavement and not gravel, there would have been no time to think and shut her off. Spinning in gravel was the only savior. Replace it?KillJoy Probably, I've only known this bit of info for 30 minutes. And BTW, a red Power Wheels would have been in the path of destruction as well. Quote Link to comment Share on other sites More sharing options...
Cordell Posted February 28, 2011 Report Share Posted February 28, 2011 Something has to be creating a vacuum leak, faulty EGR system?, faulty TB?, something like that. Be curious to see on a scan tool, maybe that that buggered up TPS isn't moving with the throttle blade like its supposed to. Quote Link to comment Share on other sites More sharing options...
nurkvinny Posted February 28, 2011 Author Report Share Posted February 28, 2011 Something has to be creating a vacuum leak, faulty EGR system?, faulty TB?, something like that. Yeah, been out there tonight tracing vacuum lines. Be curious to see on a scan tool, maybe that that buggered up TPS isn't moving with the throttle blade like its supposed to. EGR deleted. Quote Link to comment Share on other sites More sharing options...
Cordell Posted February 28, 2011 Report Share Posted February 28, 2011 Yeah, been out there tonight tracing vacuum lines. EGR deleted. Well I doubt an EGR would cause those symtoms. Is it an auto? Vacuum modulated? Maybe that has something to do with it happening in gear. I really don't know, but maybe something to check. Quote Link to comment Share on other sites More sharing options...
nurkvinny Posted February 28, 2011 Author Report Share Posted February 28, 2011 Well I doubt an EGR would cause those symtoms. Is it an auto? Vacuum modulated? Maybe that has something to do with it happening in gear. I really don't know, but maybe something to check. Just mentioning that the car doesn't have an EGR setup, it was deleted. It is an auto, I *think* it would be vacuum modulated - it's a C4, but has been converted to full manual, reverse pattern. I got this reply on another forum - "tps. My car did the same thing. Yes your tps can pull the car to 6k with the tb closed. Dont ask me how" Hmmm. I could buy that a hosed up TPS could hold the car at an RPM by having physically messed up plastic inside it stopping the blade from returning shut, but I'm not sure how it would cause one to rev high? Quote Link to comment Share on other sites More sharing options...
Browning Posted February 28, 2011 Report Share Posted February 28, 2011 ask him how Quote Link to comment Share on other sites More sharing options...
Benner Posted February 28, 2011 Report Share Posted February 28, 2011 What vehicle was it in? Had it happen once after I jump started the Formula once. Driving a friend home and all the sudden the idle launched up to 4500 or so. Got it home and pulled the battery cable and let it sit all night. Hooked it back up the next morning and it ran like nothing ever happened. I'm guessing the computer had a stupid moment and pulled the IAC all the way out. Quote Link to comment Share on other sites More sharing options...
351mach11647545510 Posted February 28, 2011 Report Share Posted February 28, 2011 but how could anything cause the motor to rev that high without the tb open some to pull in enough air to rev that high. No expert but do you have cruise control on the car? thats where i would think to look if the throttle body is cable operated. Quote Link to comment Share on other sites More sharing options...
Benner Posted February 28, 2011 Report Share Posted February 28, 2011 but how could anything cause the motor to rev that high without the tb open some to pull in enough air to rev that high. No expert but do you have cruise control on the car? thats where i would think to look if the throttle body is cable operated. Interesting. i'd never even thought about that but that could be the case, may have been mine as well. Quote Link to comment Share on other sites More sharing options...
nurkvinny Posted February 28, 2011 Author Report Share Posted February 28, 2011 but how could anything cause the motor to rev that high without the tb open some to pull in enough air to rev that high. No expert but do you have cruise control on the car? thats where i would think to look if the throttle body is cable operated. No Cruise Control. I'm tracking an interesting idea concerning the turbo building pressure and forcing the tb blade open, raising the RPM, raising boost, raising RPM, raising boost... Quote Link to comment Share on other sites More sharing options...
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