Engine misfiring

[eds7]

Need help! My current 318ci e46 (2001) has a major problem in engine misfiring, the engine will shake and shut off when i am in low idle, especially in a traffic jam, on a hot day. Wouldn't dare to bring it to KL to face all the traffic there. Anyways, i read somewhere that it is caused by a leakage in the vacuum hose. Where can I locate the vacuum hose in the engine? I have replaced all ignition coils previously but it still happen. Any advice or solution? If it is the vacuum hose, where can i replace it and how much? Any assistance is much appreciated. Thanks! Eds7

 

[taabster]

engine kong! change engine...

 

[pussy]

eds7.. please take it to a good mech that has GT1 software.. becareful of driving the car for this period..

can be a lot of factors causing it, at least 20 known problems.. so check it out soon.

 

[Mouse]

engine kong! change engine...

u r not helping

 

[eds7]

Ive taken it to a few mechs already and hooked it up for a diagnose checkup. They all say there is no fault that comes out on the computer. When u say 20 known problems, what are some of the problems? Maybe u can share with me. It might help.

I was lookin for the vacuum hose to check whether there is a leak but cant seem to locate it.

 

[flash]

Ive taken it to a few mechs already and hooked it up for a diagnose checkup. They all say there is no fault that comes out on the computer. When u say 20 known problems, what are some of the problems? Maybe u can share with me. It might help.

I was lookin for the vacuum hose to check whether there is a leak but cant seem to locate it.

Among known common faults... spark plugs, ignition coils... pussy, care to add?

 

[python_dev]

Cam Shaft Sensor will do that as well, can be reporting fine but working badly...LOL

 

[K.M.]

If need to check 1-by-1 of the 20 known caused, go with the least expensive 1st.

 

[jarance]

Ive taken it to a few mechs already and hooked it up for a diagnose checkup. They all say there is no fault that comes out on the computer. When u say 20 known problems, what are some of the problems? Maybe u can share with me. It might help.

I was lookin for the vacuum hose to check whether there is a leak but cant seem to locate it.

You have taken your car to a few mechanic and they still cannot find the vacuum hose! or they cannot find the leak at the vaccum hose?

Vacuum hose are relatively cheap. If you car is about 6 years old, it would be advisable to change all the rubber hose as a routine maintenance. This include all the water hose from radiator to engine bay etc.

When you say that you replace all ignition coils, what do you means? Your car got more than 1 ignition coils?

Engine misfiring can be caused by :-

1. spark plugs
2. loose ignition cable ( you can check this by removing one cable at a time. The cable that does not retart the engine speed is the cause)
3. faulty ignition cable (high tention cable). Leak of high tension voltage to ground. (use a long expose screwdriver and lay it along the cable. If there is small spark, then the cable is faulty)
4. air filter complete choked.
5. faulty TPS (throttle position sensor)
6. fault MAF.
7. knock or camshaft sensor
8. choke fuel injectors

I would check the spark plugs first. then air filter. then ignition high tension cable. then change vacuum hose. then check TPS. then MAF..

btw, item 1, 2 & 3 fault cannot be find by GTII lah..