Squealing noise at idle
Discussion
The car is out of hibernation now and it's back on the road.
The squealing violin is back, and this time it is more or less constant at idle speeds once the engine is warm. All the time. If I raise the idle speed with the throttle, by even 200 rpm, it goes completely. It does not come back again at higher engine speeds until it slows down to idle again.
Last year, each time I tried checking the idle screw and got my tools out to check it, sod's law, the noise had gone, but now it's back more or less constantly, I would like to have a look at it again.
My question is, how critical will the final position of the idle screw be as far as the stepper motors performance is concerned? I mean, if I have set it with everything clamped to 650 rpm, which in the past was when it squealed the loudest, if I then add another turn to it to stop the noise with the hose unclamped, what would the effect be to the rest of the running? Will the stepper start acting up?
The squealing violin is back, and this time it is more or less constant at idle speeds once the engine is warm. All the time. If I raise the idle speed with the throttle, by even 200 rpm, it goes completely. It does not come back again at higher engine speeds until it slows down to idle again.
Last year, each time I tried checking the idle screw and got my tools out to check it, sod's law, the noise had gone, but now it's back more or less constantly, I would like to have a look at it again.
My question is, how critical will the final position of the idle screw be as far as the stepper motors performance is concerned? I mean, if I have set it with everything clamped to 650 rpm, which in the past was when it squealed the loudest, if I then add another turn to it to stop the noise with the hose unclamped, what would the effect be to the rest of the running? Will the stepper start acting up?
Just wondered how you got on with this, strangely I started my car yesterday to warm it up and I had the howling which comes and goes.
I confirmed it is the stepper circuit as I’m able to remove my inlet hose due to being on megasquirt.
I’d be interested to know how far out other peoples bypass screws are too just as a baseline to work from.
I confirmed it is the stepper circuit as I’m able to remove my inlet hose due to being on megasquirt.
I’d be interested to know how far out other peoples bypass screws are too just as a baseline to work from.
Belle427 said:
Just wondered how you got on with this, strangely I started my car yesterday to warm it up and I had the howling which comes and goes.
I confirmed it is the stepper circuit as I’m able to remove my inlet hose due to being on megasquirt.
I’d be interested to know how far out other peoples bypass screws are too just as a baseline to work from.
Well, my car did me a favour in the end as I had checked everything and just couldn't find where it was coming from. I saw a small pool of water under it as I backed out of the drive and saw the drip was coming from behind the water pump pulley where I understand there is a weep hole. So I ordered a new pump, fitted it and after just having driven it for about 10 odd miles, it seems the noise has gone. I confirmed it is the stepper circuit as I’m able to remove my inlet hose due to being on megasquirt.
I’d be interested to know how far out other peoples bypass screws are too just as a baseline to work from.
So it points towards the water pump, although it does not explain why even with only 200 rpm more, the noise went away rather than got louder.
I will see how it goes after I have had a chance to drive it some more.
I changed my pump as when I had the noise I removed the serp belt and it went away but sadly it wasn’t this.
It was hard to pin down but I eventually heard it through the air filter, so then took the inlet pipe work off with engine running to confirm it’s howling through the stepper circuit.
It was hard to pin down but I eventually heard it through the air filter, so then took the inlet pipe work off with engine running to confirm it’s howling through the stepper circuit.
Belle427 said:
I changed my pump as when I had the noise I removed the serp belt and it went away but sadly it wasn’t this.
It was hard to pin down but I eventually heard it through the air filter, so then took the inlet pipe work off with engine running to confirm it’s howling through the stepper circuit.
I'm hoping mine has gone but won't know for sure until I've driven it for a few daysIt was hard to pin down but I eventually heard it through the air filter, so then took the inlet pipe work off with engine running to confirm it’s howling through the stepper circuit.
😊
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