PH1 Stays accelerated

[hatyy]

here's a new problem of my ph1, it stays accelerated and only by pressing a bit the throttle it returns normal........yesterday I cleaned the TB and lubrificated the throttle cable .....but can't solve it .........

there's also a pin that blocks the cable on the throttle body....how it has to be adjusted ?

any ideas ?

 

[Jonny1*2]

Pin that blocks the cable? Idle screw? Did you fully strip it? When you operate it by hand does it stick?

 

[hatyy]

no it doesn't sticks.....

here's the pin I'm talking about ..



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[Jonny1*2]

You mean the bit that holds the cable to stop it flapping around. It's not adjustable. Change the cable? Throttle pedal sticking? Tps on the blink? I've a spare tb if you need

 

[Sam]

-Karl- use to have this problem with his. He used it for cruise control.

 

[-KarL-]

LOL yeah mine stook quite a bit then it snapped.

Have you lubed the cable by the pedal?

 

[hatyy]

hahaahaha lol

I use it to for cruise.....but with low ration gears ....it does 45 mph

I put some spray lub in the cable ...but from the side of the tb and not the pedals...

 

[Johndolan1979]

It'll more than Likley be the throttle cable. Changed mine for a new genuine one and low and behold the problem was gone.

 

[Nickson]

LOL yeah mine stook quite a bit then it snapped.

Have you lubed the cable by the pedal?

Try fitting a new cable?

Sorted my sticky throttle

 

[Andyman]

Cable of worn TB spring.

 

[Gavin J]

Check for an air leak on your inlet manifold, this can screw up the revs at idle. Last time I changed my pluGs i got distracted and didn't pinch it all up as tight as i should of and suffered with it sticking at high revs...

 

[clancy]

-Karl- use to have this problem with his. He used it for cruise control.

thats what i do, sits nicely at 2k rpm. works out at about 30 in 3rd or 4th. handy

 

[hatyy]

will check once again all the stuff ......and tomorrow i order a new cable .....hope will sort the problem .....

 

[Saner]

Mine was a frayed cable just as it came through the bulkhead.

 

[hatyy]

really bad news ....:dapprove:

i changed the cable ...and the idle motor ...the butterfly gasket but still isn't perfect......last bit to change is the sensor that read the position of the butterfly (we call it potentiometer)


help !!!!

 

[hatyy]

quick update .....i changed the lambda ....and now the rpms go down ....but once near the idle it goes up and down at least 3 times before stabilizing itself.

 

[Andyman]

If its not the cable it will be the throttle body its self or to be more accurate, the throttle body spring.

Very common fault. The spring looses its tension with age and rubs on the TB holder causing the revs to stick.

 

[Michael Woodford MST]

Quick fix for this is,

Look at the throttle buterfly, loosen off the 2 torque head screew. Don't take them out, just losen them a little bit. Then pull the black part that the trottle cable wraps round outwards towards the bulkhead. Re tightnen the screws with that bit pulled out. Done

I must do 3 a week like this

 

[hatyy]

throttle cable is new..............now i will try this solution .......

thank you very much

 

[corsadi]

I have the same problem at my recently purchased 172 ph1 and I am about to order a new throttle body. So if this trick works it will save me a lot of money! When you say towards the bulkhead what exactly do you mean? Do you think you could send me a picture of what you mean? Do I have to remove any bits or just change the position of the butterfly?