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Hi there, Please be informed that sometimes RPM is unstable. Sometimes it's almost 1000 sometimes about 800 or less (in the same conditions: without A/C, lights,...) It is slowly fluctuating and sometimes when rpm drops below 700 unpleasant vibrations appears as well as my car (Toyota AE100) die ( stop). I am eagerly waiting for your assistance. Please help me. Best Regards Ameen

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Try Cleaning the throttle with carburator cleaner and the IACV (idle air control valve) It should make a difference!

Posted on Apr 06, 2013

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I'd start by replacing fuel filter. I'm assuming it's been recently tuned.... If not, replace plugs, wires, all fluid & filters and run a good fuel system cleaner through it.

Posted on Mar 22, 2011

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Posted on Jan 02, 2017

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Making whistle noise on off on run and stopping.


There are basically two types of whistle noises.

* Whistle when you get more gas (increase RPM, put gas pedal, sometimes just idling but louder when you put more gas)
This usually intake-side leak.
Intake manifold itself, intake manifold gasket (most likely), even airfilter housing, Airflow meter housing (connector), anything where air goes to engine.
usually engine get rough or unstable idle when intake leak occur.
Engine knocking or pinging may feel.

* Whistle when you decrease RPM (engine brake, reduce speed, sometimes just idling but louder when it dropping RPM)
This usually Vacuum-side leak.
There are many vacuum hoses in engine room. even inside of cabin (heater control, etc)
Try to spot where it coming from.
Vacuum also connected to Brake servo, heater control and spark timing.

Put metal or plastic pipe (small PVC pipe will work fine) to one of your ear then isolate source of noise and find where it come from.

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could be a TPS or even a dirty throttle body that needs cleaning. even a small vacuum leak can cause this depending were the leak is.

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