Technical Crank shaft sensor - tdc

[JBrouwers]

Hi, I have a '99 polish maluch where the stationary rpm seems a bit high. Checked for air leaks and fixed one. I've already set the idle screw to almost nothing, disengaged the choke, closed the mixture screw more and more and that helped somewhat.

So maybe the timing is off somehow? Now when I use a stroboscope light to see if we have anything close to the 10o BTDC , I'm getting a reading closer to 30 or 40, way out of scale.

Yet, I don't have a distributor that I can easily change; I have a crankshaft sensor which is bolted and doesn't seem very adjustable. Does anyone know whether this is normal or know how to adjust this? I'm hoping that changing it will ease down the engine

Hope someone can help
Regards Jeroen

 

[bugsymike]

Hi, I have a '99 polish maluch where the stationary rpm seems a bit high. Checked for air leaks and fixed one. I've already set the idle screw to almost nothing, disengaged the choke, closed the mixture screw more and more and that helped somewhat.

So maybe the timing is off somehow? Now when I use a stroboscope light to see if we have anything close to the 10o BTDC , I'm getting a reading closer to 30 or 40, way out of scale.

Yet, I don't have a distributor that I can easily change; I have a crankshaft sensor which is bolted and doesn't seem very adjustable. Does anyone know whether this is normal or know how to adjust this? I'm hoping that changing it will ease down the engine

Hope someone can help
Regards Jeroen

If engine revs are high that needs to be dropped before checking timing as it will be advancing automatically to your 30 degrees roughly.
Do you have any air leaks on inlet side, possible if, fitted a leaking brake servo drum is common rusted through.
Sometimes if you hold a rubbere tube to your ear , you can use the other end to move around the inlet area to listen for hissing noises of air leaks etc.
Has it always been like this or has something on the engine been changed recently?

 

[JBrouwers]

I think I've finally found the problem and it's a stupid one: the spring with the moving valve of the carburetor where placed upside down so the engine got a constant choke.....

 

[bugsymike]

I think I've finally found the problem and it's a stupid one: the spring with the moving valve of the carburetor where placed upside down so the engine got a constant choke.....

Not me, but you are probably not the first.