224 replies to this topic

[leepol83]

Here is a picture of the adjustment screw.

It is alittle tricky loosening the lock nut. I then use a torx bit to make the adjustment. and very carefully tighten the lock nut. Then retest to make sure nothing moved again.

Brilliant thank you that’s the one I thought it was 👍🏻

[tmsmini]

You may find on the original plastic throttle bodies that the screw is oriented the other way. In this case, it may be easier to find a torx screw(instead of a torx bit) that you can use to make the adjustment.

 

Once you get either type adjusted, it helps to shut off the engine and block the throttle plate open to give better access to the lock nut. Just test again to make sure nothing moved during the process.

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[leepol83]

You may find on the original plastic throttle bodies that the screw is oriented the other way. In this case, it may be easier to find a torx screw(instead of a torx bit) that you can use to make the adjustment.

Once you get either type adjusted, it helps to shut off the engine and block the throttle plate open to give better access to the lock nut. Just test again to make sure nothing moved during the process.

I see great idea thank you, hopefully my new throttle body will be here soon and hopefully get it working 👍🏻
Thanks again

[leepol83]

Hi all
New throttle body on well second have plastic one, seemed fine and smooth before fitted, ran it for a while and seems sticky again, I’m trying to set the stepper steps but it just won’t do it, I plug it in get it all set to adjust as it should it says zero on the steps, wind the throttle stop screw out so it just just touches it, starts to open throttle and revs just shoot up 🤷‍♂️ And stay up!!!
I’m literally out of things to try very frustrating!
Any help really appreciated

[tmsmini]

Steps should not be at zero when the engine is warmed up. Steps should start high when cold and drop down to the range(16-25 steps) when warm. This is the point at which you can adjust the throttle stop to between 16-25 steps.

 

If it is really reading zero when warm, then there is another issue with wiring or the IACV.

[genpop]

It would be a good idea to have this work done by a person who is used to it. Having the tools is no guarantie that you know how to use them or that you can do the work!

[leepol83]

Steps should not be at zero when the engine is warmed up. Steps should start high when cold and drop down to the range(16-25 steps) when warm. This is the point at which you can adjust the throttle stop to between 16-25 steps.

If it is really reading zero when warm, then there is another issue with wiring or the IACV.

Ye when it’s plugged in and warmed up it reads zero , if I rev it the steps go up and down, I did think this didn’t seem right, but still doesn’t explain why the adjustment screw isn’t adjusting the steps this I don’t understand,
It’s a brand nee IACV fitted
Thanks

[leepol83]

Any more ideas ? looking like I may have to hand this over to a specialist if I can’t sort it myself! I’m just confused why the throttle is stiff again and I can’t adjust with the screw ?
Any help appreciated greatly starting to really get me down now 😢

[pete l]

If it's reving up as soon as you start to adjust the throttle position, surely it would do it if you just touched the accelerator pedal.

 

When it starts reving up on it's own, if you turn back the screw does it settle down ?

 

Next time you do it, reset the valve with the ignition on, down and up 5 times on the pedal etc.

 

Try setting the iacv steps again. If it starts reving up, ignition off, reset with the down and up motions, and try again.

[leepol83]

Thanks for the reply
It does rev up itself if I press the pedal aswell.
I have the screw not even touching the throttle and if I rev it it’ll rev up itself.
I’ve done the reset so ignition on, pump accelerator 5 times within 10 seconds and ignition off and back on, that makes it tickover lovely and sounds great, but if I rev it very gently it’s reving up itself, to stop it if I rev it harder/more it’ll calm down abit.
Don’t get me wrong it’s better than the start of this thread, basically now it just holds the revs abit and will drop back down itself eventually.
It does seem like this throttle body is sticking again albeit being a replacement one, if I try to gently wind the screw it takes abit of force to get the screw to open the throttle, then it just shoots the steps and revs up and up.

[tmsmini]

If it reads zero, then there is possibly a wiring issue, as the adjustment is not being recognized. One or more of the sensors is not communicatings with the ECU, but this is just an internet guess. Did you swap your new throttle position sensor over to the new(used) throttle body? With a new IACV, there should be a new o ring that came with it, is it still in good condition?

[leepol83]

If it reads zero, then there is possibly a wiring issue, as the adjustment is not being recognized. One or more of the sensors is not communicatings with the ECU, but this is just an internet guess. Did you swap your new throttle position sensor over to the new(used) throttle body? With a new IACV, there should be a new o ring that came with it, is it still in good condition?

Hi yes I put in the throttle position sensor and yes put on the correct seal on the IACV aswell I haven’t checked the seal if I’m honest for damage but it was all brand new, would my code reader not pickup a faulty sensor ?
Thank you for you’re help on this

Edited by leepol83, 10 December 2020 - 08:21 PM.

[tmsmini]

If there are other issues, the ACR may not be able to interpret what information it is receiving.

 

https://youtu.be/YFUMrqYDzsY

 

This is a cold start video showing the steps that my engine shows. If yours shows zero at this point, there are other issues.

Before making any adjustment, all the basics have to be in place, no leaks from hoses, no manifold or exhaust leaks etc.

[leepol83]

If there are other issues, the ACR may not be able to interpret what information it is receiving.

https://youtu.be/YFUMrqYDzsY

This is a cold start video showing the steps that my engine shows. If yours shows zero at this point, there are other issues.
Before making any adjustment, all the basics have to be in place, no leaks from hoses, no manifold or exhaust leaks etc.

I’ll plug it in and see what happens, pretty sure it does the same as you’res thow, I did think an air leak as this was an issue before from the manifold I’ll double check this is resolved thow 👍🏻
Thank you 🙏

[pete l]

With the throttle screw not pushing on the lever, then you will get the impression that the throttle body is sticking, because the butterfly, which is spring loaded, will be fully closed and pushing on the throttle body.

 

Broken wires in the loom behind the inlet manifold is a known problem. Especially after worn tie bar bushes, the engine rocks forward and backwards and the wires break. I had it on my MPI, but on the MAP sensor wiring.