So i started my new motor for the second time today

it warmed up perfectly fine...i rolled it out of my drive way and started driving, literally 10 seconds later the car just started revving all the way to redline on its own

so i cut the car off and rolled it back to my house
now right from the start it just takes off revving right away...

so i took off the intake elbow (its a greddy elbow) thinking for sure that something just jammed the throttle body open, no biggie

but theres nothing wrong with the throttle body, it functions perfectly, i pull it open from the cable and it snaps right shut

so i disconnected the cruise control and i unplugged the ACV from the throttle body and it still just takes off revving

so i dont know what to do now, those are all the things that control the throttle body, any ideas of what it could be???

 

Vacuum leak?


When the motor revs up if you put your hand over the throtle body intake does the motor shut off?


John

 

i dont think its a vacuum leak...cus it would have to be a hugeeee leak cus the revs dont gradually go up...they take off as if i had the pedal to the floor

i'm going to try that tomorrow to see what happens, i cant do it without having another person with me cus the revs take off so fast

 

Try disconnecting the AWS plug on the back of the UIM..... if you haven't blocked it off.

 

Check your throttle body adjustment screws.

 

which one is this? is it on the bottom of it? but how will that keep air from coming in if the throttle body is closed? cus i dont think that has an air release does it?

 

could it really be that?

the car idled and warmed up perfectly, then wen i started driving it started doing that, now its just doing it all the time

 

Sounds like it's a combination of the TPS and AWS Possibly IAC

 

dont mean to sound like a newb but could you guys help me out with what all those TPS, AWS, IAC etc.. stand for and where they're located? lol

 

sounds like you missed something big, like tightening down your UIM or something pinched under it, but sounds more like it is loose and worked it's way off after initial warmup.

 

Why don't you stop acting like a "newb" then and use the SEARCH function, that's what it's there for. When I was new to this forum I learned so much more information by searching myself then having information handed to me. Also a little patience goes a long way.

AWS = Accelerated warmup system
IAC = Idle air control
TPS = Throttle position sensor

 

checked that, everything is tied down...i'm seriously stumped by wut it could be

 

lmao ok buddy

 

If it were something big that you missed it should've been a problem from the moment you started it up. However something could've gotten completely loose if you didn't tighten it down properly once you took off driving.

The AWS revs the car up to 3k, so if it's going much higher then that might not be it. And the IAC I don't think will make the car rev either. I say first check the TPS, both the readings and make sure it was tightened properly to the TB. That seems to me like the most logical thing that could've gone out of whack electronically, and it only takes like 10 min. to check

 

If you say the the car revs up to red line then i am pretty sure you need to check the throttle linkage and or throttle body adjustments. do this

1. remove the pedal linkage from the throttle body,try to start the car
2. Remove the greddy elbow and start the car see if the butterfly valves open on their own or they are open because the adjustment screw.
3. See if you are getting vacuum at the double throttle actuator ect...

 

i did all of that already

more suggestions guys!!! i'm gona print this thread and go over the car according to all this this afternoon

 

Just a guess, but maybe the brake vacuum assist diaphragm tore and is acting as a huge vacuum leak as the intake is trying to restore vacuum to the brake assist reservoir. To cause an RPM increase that big, the leak has to be very large. So I'd also look for any other large vacuum hoses attached to the UIM after the throttle body that might have come loose.

 

ok so heres the update....i pulled off the manifold...everything is in order down there...all the lines are connected all the electronics are bolted firmly...no leaks no holes...brake reservoir hoses are all connected up and good...

what my friend told me is that it has to be something to do with the vacuum system because it happened when i started driving it which means the turbos started producing a bit of boost and something has to have flown off somewhere...this makes alot of sense but i cant figure out what would be big enough to allow the motor to rev that high, it cant just be one of those small vacuum lines...

any ideas?

 

even a massive leak like the vacuum assist for the power brakes wouldn't make the car redline, it has to be a massive leak and i do mean massive! we're talking about stuck butterflies in the throttle body or manifold not bolted down, that's it.

i'm leaning towards the throttle body sticking somehow because it's highly unlikely that it ran fine and then had a leak afterwards. something in your TB is fooling you to thinking that the butterflies are closed.

 

im thinking the same thing...but they open and shut fine, and they snap closed...i took brake cleaner and shot some in there and it still did it...

 

try backing off the idle screw and see if it does anything at all.

 

Did you try unplugging the aws? Start the car with it unplugged and drive it around.

 

Do you have a PFC or the stock ECU?

If you have a PFC, can you check the TPS readings? The only time I've had my car do anything similar is when I've forgotten to plug the TPS back in prior to starting the car. However, I would imagine you could have a similar effect if the TPS ranges are really far out or if there is a wiring issue of the ECU not being able to get the TPS reading.

 

Do you have cruse control on your FD?

 

What I was thinking... maybe the CC unit is acting up. The cable for it could be disconnected from its pulley, and then the car re-tested.