Low idle after timing belt change

[Shizukesa]

It ran fine before but now the idle speed drops as low as 500rpm. Is it a tooth out?

This is my fault of course but not entirely my fault... whoever did it last has painted two consecutive teeth on the crankshaft gear... I just must have chosen the wrong one 😕

Any advice would be appreciated. Thanks.

[scudney]

500 rpm isn't overly too low,my IS200 sport used to run at about that when I owned it

[Shizukesa]

On 4/7/2020 at 4:11 PM, scudney said:

500 rpm isn't overly too low,my IS200 sport used to run at about that when I owned it

Thanks! I've since realised it's quite normal for an IS200 to idle pretty low.

[Mihanicos]

It is very important for many reasons to have the precise engine timing. Before you remove the timing belt or chain of any engine, you must always verify its timing and all the reference timing marks.

There are a few special tools which  can set precisely the engine timing and some engines may have only the TDC marked on the crankshaft. Find the inlet and exhaust valve timing of the engine with respect to the crankshaft position, from a repair manual.

Mount a graduated disc in degrees on the engine's crankshaft and align the 0 degrees point of the disc with the TDC mark on the crankshaft. Turn the engine clockwise and observe when the inlet and exhaust valves when they just begin to open on No.1 cylinder. Check this reading against the engine's valve timing.

 

Chris.