I Still Got The Problem (new Engine?)

[rossie150]

323ci

2 vanos units
1 vanos breather hose
1 set of spark plugs
1 camshaft position sensor
1 ecu
1 set of coil packs
checked injectors

and i still have a low rev misfire when hot
today it sounded like it was running on 3/4/5 cylinders (bub bub bub) the first time this has happened !

i have taken the car to woods,coopers and now hampshire cars the guys there say they are out of ideas and have contacted bmw gb, i have also been booked in for a week next week. is a new engine on the cards or will i get somthing else?
what should i do?

[storme]

HEY U LIVE NEAR ME



just a thought,,,,maybe it is running tooooo hot,,,and you are getting heat soak???

i know you probably have the original air filter etc
but mine was running too hot,,,and had this affect....

i changed to the correct spark plugs,,,car ran cooler and no misfire,,all because of heat soak...so said woods of bmth

[rossie150]

well i must admit 'heat soak' is new to me, the thing is they already changed the spark plugs and there was no improvment

when you say you had the wrong spark plugs ,where they fitted at bmw?

temp seems fine never more than halfway

[storme]

heat soak being the heating of the air that goes into the engine,,,not the temperature of the water and/or oil.

if the temperature of the air is too hot it will fuel badly,,,,,hence on a cold day,,your car goes like the clappers...and on a warm day,,,if dont feel the same...

its just a thought,,,could well be miles wrong

[///Matt]

This may be a long shot, but it sounds like a vacuum leak (especially if the cyliners are next to eachother) Intake manifold gasket failure?

[rossie150]

when i say 3/4/5 cylinders i probably mean 5 i would usualy say 3 but its got six????

vacuum leak only when hot?

[bryan1970]

although it is not really common it IS possible for a only hot vacume leak. if the gaskets are just on the verge of failure when they get hot they expand and could create a leak. next time it's in it might be worth mentioning to the tech. did they ever say what kind of faults were storred in the computer?

[rossie150]

apperently there are no faults hence contacting bmw gb for advice

could having this problem over a period of say 4-5 months done any permanent damaged to my engine?
it dosent sound very nice at low revs like it did

[bryan1970]

if it has been over 4-5 months i would dobt that it is a vacume leak becasue usually something like that will get worse as time goes on. as far as damage goes it shouldn't do any permanent damgae. the only thing you might have to worry about are the spark plugs getting fouled becasue it is misfiring

[rsn48]

Could also be a fuel filter problem (cheap fix) or your fuel pump.

[rossie150]

i took it for a long drive today and then after about 1/2 hr it seemed to lose power and run on five constanly for about 2 miles then i swiched it on and off and it was fine (ish) ???

[storme]

next time it does this,,,,undo the fuel cap...then drive off and see if there is a difference

[rossie150]

will do