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Rough Idling...What's the Cause?


Hoppe
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Need some expert advice here.

My old ride is recently giving me some rough idling.

Normal idle at 900-1K rpm but occasionally will go up to 1.5K, then after a while the car will choke a bit and idle drops back.

This situation is not consistent.

 

I suspect it have something to do with fuel/air burning ratio not being consistent or Radiator not working 100%(causing a little bit of overheating), as this problem seems to surface when the engine is stressed. For eg, on steep roads, after running the highway, etc. Also on cold weather, the problem seems to occur less comparing to hot weather.

 

The other reason could be my carb acting up.

 

But anyway, if any bros have any good comments, pls voice out.

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The follow might be the reason;

A. spark plugs - when did you change it

b. high tension cables to the plugs. try disengaging each and see any changes.

c. Radiator - check temp

d. Fuel pump failing

e. Fuel filter clogged - check filter.

 

My guess in priority, b then d. Hope it helps.

 

Ivan

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(edited)

a & b are out as I recently changed spark plugs & checked tension cables.

For Radiator, maybe...gotta check.

For Fuel Filter, high possibility as I haven't change it for a while. What is the rationale behind the fuel filter causing rough idling? [confused]

Edited by Hoppe
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Somehow the reply notice is not sending any mesage....

 

Anyway, based on what you have said, whent here is a surge in power requirement, the car runs roughly. That means you de-press the throttle more, and more fuel is required, thereafter, if the fuel filter is clogged, then there is a lag, and the car judder under fuel deficency, my guess.

 

Ivan

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(edited)

ok...how much is the mkt price for a fuel filter?

must the car fuel tank be empty during change?

Worry that petrol drains out.... [dead]

Edited by Hoppe
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Cheap...should be less than S$30. It is a clear plastic piece, with 2 male connectors, one from the fuel tank and the other to the engine.

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hehe..it's noisy all the time lah. [sweatdrop]

 

Oh..just remembered. Problem seems to happen more with air-con off!

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hehe..so many possibilities.

Thanks guys.

Must bring my ride to mechanic for checkup.

[nod]

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