Engine trembles and Vibrates before Shuting down

[Godfinger]

Mounting checked and is still

Useable. Only suspect now could

Be the ICA or TB. Shall rule out

TB since idling when waiting at

The lights or more specific, when

Gear is in 'D' is perfectly normal.

Could b relating problems with

Loading since problem only happens

When A/C is shut off.

[Godfinger]

Dirty fuel filter or choked injectors?

Dont think these are the culprits since

My engine is able to rev willing.

[PaiKia-Lee]

I got same problems with one of my cars recently. Worse than u. Sometimes when stopping at traffic light, the engine simply vibrate and stalled. Sometimes when going upslope and when i release the accele and step on it again, engine just died.

 

Need to sell away this car asap as i have changed aircon compressor and the problem persists

[Xcen]

my colleauage had this problem when he pump at malaysia.

realised that they actually mixed kerosene into their petrol and resulted in the same issue as u.

 

 

[PaiKia-Lee]

my colleauage had this problem when he pump at malaysia.

realised that they actually mixed kerosene into their petrol and resulted in the same issue as u.

 

Strange. I have been pumping in Malaysia for 10 years for all my cars and my relatives all never complaint about kerosene added to petrol

 

 

[Xcen]

petronas?

esso and shell no problem

[Chickensoup]

Recently, I discover that my engine will tremble and Vibrate before

I shut off. Problem is, this issue doesnt occurs everytime. More likely

to happen when I turn-Off the Aircon and engine still running. Gear in 'P' and it will

trembles and Vibrates, RPM drops for that few seconds before it

suddenly rev up again to prevent engine stalling.

 

What could be the problem?

I have my Plugs changed, Engine Oil renewed and Filiter change

as well. Problem still persist. Could it be the sensors issue or

Idling problems? Nothing of this sort happens when Gear is in 'D'

 

What is your engine rpm showing before you off engine (aircon off) ? and what is your usual idling rpm?

 

Did you have this problem before you went to service your car, change oil and spark plugs?

[Godfinger]

Service done and with A/C off, idling is 800rpm. With A/C on, it's 900rpm.

But when the engine trembles, the rev can go as low as 500rpm. Making

The engine very unstable and like stalling any moment.

 

[Jellyfish]

i suspect it the engine mounting on the gearbox side that went up lorry liao, but since you are going to a work shop, might as well change em out to save the hassle , unless you like to hang out at workshop every week

[Yeobh]

When you kill yr petrol powered engine, if the engine will keep on running and trembles before it comes to a stop - this is call " dieseling". That means within the engine compression chamber there are carbons that will are still burning due to extreme heat generated either by wrong plug heat range, use of high octane fuel above recomedation or the engine ignition timing is just too advance.

[Gnahp]

Bro Yeobh,

 

Dieseling phenomenon not found in modern fuel injection engine any more

 

When you switch off the ignition switch of an EFI engine, the whole EFI system shut down including the fuel pump, injectors etc. No fuel, no dieseling.

 

[Yeobh]

You are correct but there are possibilities of some remain combustible fume within the combustion chamber, or blow- by fumes that are being re-circulate back into the intake system.The other cause maybe leaking injector ( the fuel header pressure remains high as 7kg/cm2 even when the fuel pump has stop pumping).

[Chickensoup]

Service done and with A/C off, idling is 800rpm. With A/C on, it's 900rpm.

But when the engine trembles, the rev can go as low as 500rpm. Making

The engine very unstable and like stalling any moment.

 

Ok your problem is call dieseling ( engine run-on after ignition is off). Is that what you are complaining?

[Gnahp]

That

[Chickensoup]

That

[Happily1986]

i suspect the culprit is the ICV, Idle Control Valve.

[Chickensoup]

I don't think it is ICV because before TS goes for this last service there isn't this problem. Can't be such a coincident just after service, the ICV knock out.

[Godfinger]

Not dieseling. The trembling is before I shut off the engine.

Here is how it goes. Park my car, put the Gear into 'P'

turn off the A/C and the rev falls and engine trembles.

Then moments later, the Rev builds up again to save the

stalling engine and I shut off the engine.

 

Everything is fine when I turn off the engine while Gear is

in 'N' or 'D'. But nobody will shut down engine when in Gear

right. This will cause Premature failure to the GB.