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High idle speed

Question : I HAVE a 1997 Proton Wira 1.6 xli.

I cruise at 1,500 rpm even when the engine is on neutral gear.

When on Drive gear, the rpm drops to 1,000.

According to many mechanics, the engine is all right except that it consumes more petrol. Do I need to change to a new throttle body set ?

Answer : I do not think you have a problem with the throttle body or else you would be having other problems.

I think you may be having an auxiliary air valve which is not operating and the mechanic is adjusting the idle speed higher using the idle bleed.

When the load of the transmission comes in when you engage D, this pulls the idle speed down to 1,000 rpm.

With an operational auxiliary valve, the idle speed can be set at even below 1,000 rpm and the compensation will come in when the load is applied and maintain a constant idle speed.

I suggest that you put the EFI system on a checker which will identify the actual problem area without changing parts unnecessarily.

 
   
 

All about variable valve timing

Leaky valve stem seals

High idle speed

Piping issue

Late shifting

 

 

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