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Rpm dropped and slight jerk when stationary


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Neutral Newbie

Hi I'm driving a almost 5 yr old jap car. Just now a few minutes after I started the car, my car's rpm dropped, went up and there was a slight jerk forward at a stationary position. My foot was still on brake pedal and gear in D mode.

 

Any idea what happened? Pls advise. Thanks in advance.

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Neutral Newbie

it happen to me 2 wks ago, the mechanic had change the spark plug and cln the part called 'throttle' if i'm not wrong and the problem resolve. the thing they cln looks like the place where the air flows with flippers....sorry if u can't understand bcos i'm not familiar with car mechanical parts....

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it happen to me 2 wks ago, the mechanic had change the spark plug and cln the part called 'throttle' if i'm not wrong and the problem resolve. the thing they cln looks like the place where the air flows with flippers....sorry if u can't understand bcos i'm not familiar with car mechanical parts....

 

That's the throttle body I think you are referring to. And the flippers are the butterfly valves.

 

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Neutral Newbie

What's your car's mileage? It could be due to some slight wear with the engine mounting.

 

I've personally experienced this on my 8-year old Sienta.

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try cleaning throttle body.. if problem still there and getting more serious, its probably time to replace engine mountings

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Neutral Newbie

I cleaned my throttle body about 6 months ago. My spark plugs were changed 20,000 km ago and they were iridium. Normally I use 98 Esso petrol so knocking is out.

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Neutral Newbie

currently driving a Chevy and experience same issue. I manage to isolate my issue, as such it only happen when my aircon is on. if my aircon is off, no jerk at all. maybe u want to isolate the issue before heading to the right specialist. this is to avoid unnecessary cost.

 

btw, I choose to live with it, for now. do share ur experience if u manage to get it resolved.

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Hi I'm driving a almost 5 yr old jap car. Just now a few minutes after I started the car, my car's rpm dropped, went up and there was a slight jerk forward at a stationary position. My foot was still on brake pedal and gear in D mode.

 

Any idea what happened? Pls advise. Thanks in advance.

I also feel it could be your idle control valve.

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Neutral Newbie

currently driving a Chevy and experience same issue. I manage to isolate my issue, as such it only happen when my aircon is on. if my aircon is off, no jerk at all. maybe u want to isolate the issue before heading to the right specialist. this is to avoid unnecessary cost.

 

btw, I choose to live with it, for now. do share ur experience if u manage to get it resolved.

 

Sorry to bring out an old thread.

I face the same problem as above.

Everytime my car is stationary, my rpm will drop a bit and car vibrates.This happen every 5-8seconds but when i switch off my air con,no more issue!

Anyone experience before?

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Hi there,

 

Check your throttle body, if it's dirty, have it cleaed. Check your ignition coil and ignition plugs and also your fuel sensor switches. Get your trusted workshop to do all these checks.

 

It's small issues if as of above-mentioned. Cheers!

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i also have the same problem. after servicing , car will jerk slightly when driving.

 

also the car will vibrate prominently and then dissappear. i asked another mechanic to check he its just the aircon valve, wich i dont understand.

 

how much wld a iac cost ?

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i also have the same problem. after servicing , car will jerk slightly when driving.

 

also the car will vibrate prominently and then dissappear. i asked another mechanic to check he its just the aircon valve, wich i dont understand.

 

how much wld a iac cost ?

 

 

If this problem started soon after u service yr car I wud n very careful of the ws that did the service.

 

Either they r lousy n damage something or ty sabo yr car so ty can make more money repairing yr car.

 

Many WS wil sabo customers cars to earn more n get more biz. This is quite common in SG n JB WS cos ty see customer dun know anything about his cars so ty just cheat them.

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agreed.

 

 

 

If this problem started soon after u service yr car I wud n very careful of the ws that did the service.

 

Either they r lousy n damage something or ty sabo yr car so ty can make more money repairing yr car.

 

Many WS wil sabo customers cars to earn more n get more biz. This is quite common in SG n JB WS cos ty see customer dun know anything about his cars so ty just cheat them.

 

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