Just got my Sti v3 all built with TD05 20g and lots of parts to complement the turbo.
While I'm waiting for the engine to be mapped it is on the stock Sti V3 ecu.
When i start the engine the tickover climbs and climbs from 1000 to 2000 to 3000..... when I chicken out (cold engine) and switch it off.
The throttle cable is disconnected.

This seems like a pipe or sensor could be the reason, but anyone had this themselves?

911

 

Not had it myself, but with the throttle cable disconnected is the engine vacuum not pulling on half the throttle plate and opening it? But to be honest, I think you'd understand this phenomenon better than me with your nuts and bolts knowledge of engines that far surpasses mine...

 

Get someone to hold the throttle shut just in case,........

 

I've had it , but not on a scoob, Both times has been air related, Vacum hose Etc off the inlet, Liike Ron says , lock the throttle linkage shut, then you know it's not that, Difficult to hear on a noisy scoob, but listen for sucking sounds

Dean

 

air leak

 

Thanks everyone, but you have the wrong impression of my skills John! (Meccano comes to mind)

The time it happened when I blipped the throttle using the quadrents on the throttle body, the tick-over started to race immediately after it returned to closed.

Air related it is, another bloody hose!

911

 

I had the same problem recently, turns out i did'nt reseat the inlet manifold properly and air was leaking in, could be worth a look.

 

Ro, thanks for that.
The inlet was a pig to get back-on after fitting all the fuel hoses etc, just hope the Idle valve is the problem and not the manifold gaskets!
Do the simple things first...(that WILL be a first...)

Graham.

 

Idle control valve likely , you did fiddle with the breathers off there... did you turn it around ( should be marked with white line/paint, ) ditto throttle position sensor etc.

Really could do with sorting before your mapping session.

Good project thread there anyway mate!

 

Think I've just done it.

Took it all apart, cleaned the inner valve slide valve with brake cleaner amd a 'micro' squirt of WD40, washed the rubber collar and the delicate valve and disc same way.
Screwed it all back together. Noticed the vac pipe from the FPR to the inlet manifold was barely sealed os used heat shrink to double the brass tube dia and the vac tube is a good tight fit.

Started the engine, revved it a bit while it warmed up and it holds a steady tick-over.

Think I'm ok now except the engine check light is still on. That's the next job tomorrow night.

Thanks for the thread comment, been good doing it all and the 'conversations' are very interesting.

Graham.

 

Good o!!!!!