I kept the old ones as they looked in good nick (always do this to keep some spares!).
I'm oldskool and repair instead of replace...used to dry out ECUs and paint them up with nail varnish to water proof them. I had exactly the same symptoms on a previous car of mine (Alfa Romeo 166 V6). It clears up when the engine is warm and its smooth as silk after hot starts. Follow the instructions set out below. Dunno about the V8 though - plugs or coil packs possibly - it's harder to ignite the charge when the engine is running rich, such as when cold. I can't really help but I'm interested in the answer!
The new plug had a brown varnish like deposit on the white ceramic so to prevent any further problems, I put one of the old ones back in.
That elbow connecting to idle control unit on the lower intake pipe. Scan codes reveal misfire on bank 1 and related ignition coil fault and O2 sensor control limit. When starting from cold, theres a slight stutter or misfire on acceleration. It clears up when the engine is warm and its smooth as silk after hot starts.Ive read the codes but nothing showing.Any thoughts chaps?CheersDave
The variant when the banal air leak between the head and intake manifold plays a key role in misfire phenomena. I'm not sure what the deposit was but I suspect it was something to do with the condensation.
Blow me over. Put it all back together again, and the car ran sweet as a nut. To begin, turn out glows and see how things are going with soot. That’s why if possible, make computer diagnostics and draw conclusions about the causes of failure on basis of the obtained results. Namely, after starting the turn number is decreased, there is uneven exhaust and smell of unburned fuel, the engine starts to «misfire» , and as the engine warms up, the vehicle starts to work smoothly with no visible signs of engine problems. You need to be a member in order to leave a comment.
bmw 320i e46 2002/misfiring Greetings from Finland. Ask in the comments. I will have to keep an eye on things but this seems to have sorted out this particular problem.
Had a conversation with the car through INPA again and it came up with a misfire on cylinder 5.
When cold it may be sucking air, and when it's hot the warm hoses are collapsing and stopping air flow, over time the engine can "learn" to live with either of these conditions but the likelihood is its learned the less air condition.
Modern vehicles with fuel injection often suffer from poor fuel quality, but it is not a secret, it is not at the highest level, that’s why the actual washing of nozzles and change of a gas station can be quite righteous.
Cold Start Misfire Drivers often face a misfire problem when starting the cold engine.
Changing every device that you are advised can be useless. Remove all coil packs (when engine hot) and leave to air for 10 mins spray them with WD40 and pop them back in, 3. Drive it like you stole it when it's cold and hope it logs a misfire fault, Now I'm not sure on the engine you have but.... Concentric breather valve? It can be Vanos related on the M54 engine (especially the M54B30 apparently). This is not clear.
Hopefully this was the only problem. I'm not saying that'll definitely fix your problem, Dave, but for 30 minutes of your time, it's got to be worth a go. Also any dampness in the spark plug bores is steam when hot and condensates when it's cold. Slightly annoying thing is happening with my e39 535i. In this case you should look for the engine misfire cause. However, before checking and changing everything, remember that modern engines do not tolerate «blind diagnosis», there are too many similar symptoms for different faults. We will answer surely. But it still happens! My car has 195000 miles. Check spark plug wires if possible, try to replace them to see whether the result will change.
After all, any experienced mechanic knows that the glows (their color) can be said a lot to determine a diagnosis. For conscience 'sake, clean throttle body and idle air control, this procedure will never be superfluous. Diesel cold engine misfire problem is as common as for gasoline engines, but the search range decreases to several reasons. The land of Concrete Cows and roundabouts.
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