colinallcars
Active Member
- Joined
- Jul 17, 2007
- Messages
- 983
- Car
- B180, SLK 230
I was sleeping but I don’t know the answer either.I'm not answering because I don't know the answer! I imagine most people on here aren't answering for the same reason
C63 fuel trim problem
- Thread starter Wheelspk
- Start date
- Joined
- Nov 1, 2008
- Messages
- 19,499
- Location
- Bournemouth/Poole Dorset
- Car
- W210 E280 x2, w211 E55, W212 E63 biturbo, S204 C180K
In your words "The car drives and runs as normal"
An expert answered your previous questions and finished with
"If you don’t have any fault codes for fuel trim I wouldn’t worry too much. Keep an eye on it and see if it gets any worse"
Maybe you should take his advice and just monitor it for the time being.
Did you check the cam timing?
Experts quote
"Ah, cam timing could certainly be at the root of this"
An expert answered your previous questions and finished with
"If you don’t have any fault codes for fuel trim I wouldn’t worry too much. Keep an eye on it and see if it gets any worse"
Maybe you should take his advice and just monitor it for the time being.
Did you check the cam timing?
Experts quote
"Ah, cam timing could certainly be at the root of this"
I'm not answering because I don't know the answer! I imagine most people on here aren't answering for the same reason
That made me giggle
If it's running, no MIL, then I think your okay? Run the car under load preferably on a dyno, do a few strong runs under load and see how it performs power wise?
Yes the timing is normal , already posted the video and he said it was normal.
Okay ill keep an eye out if it gets worse.
With my butt dyno it runs good .
I think your okay, just check power gains are what it should be on the dyno. I'm sure it's put together correctly
One thing I forgot to mention, there are 4 solenoids on the camshaft cover. If the plungers within the solenoid are partially worn, could effect how the camshaft adjusters operate. The magnets themselves are no fault but the plunger can get gritty. You can feel it if it's gritty internally when you take it apart and apply 12volts. The plunger should be smooth in operation. All 4 solenoid needs changing once in its life time.
Would these coz the trims to go negotiable if they are “faulty “ ?
This my cam shaft position and its in spec as it should be tho.
Also can worn out spark plugs cause negative fuel trims? Mine are over 1 year old plugs and i havent changed them since 18k miles .. i have no spark plug codes or misfires.
If the oil was contaminated with fuel as the car rain rich -25 before i changed the mafs , filters and injections Now around -14
Should the oil be changed ??
Ok so im just going to ask the question. Do you have a mil light or any reason why youd checking the fuel trims as if they were an issue the ecu would flag it up as a fault code?
Have you checked for vacuum leaks, exhaust leaks or bad seals between the maf and intake manifold allowing unmetered air to enter the manifold?
Have you inspected the intake manifold internally as they are also known for degrading internally?
Oxygen sensors switching correctly and injector correction values within spec?
Does the oil smell of fuel if you sniff in the oil cap hole?
No cel light just baught a scanner and checked i shouldn’t had lol
Zero leaks exhaust or intake
New MAFs and air filters.
I changed the intake manifold with new one , injectors are installed used one made no difference
Oil has ceratec in it so the smell is a different, but the car dis ran for 1500 with both bank rich -25 to -30 LTFT now they stay around -12 to -14 and some times they drop to -10 and -8 but it’s random.
Thats why im thinking oil might be contaminated.
As a test on bank1, swap the camshaft solenoid valve over between intake and exhaust. They are same part.
Then take reading and see if the values follow. The exhaust solenoids are the ones at the top of the camshaft covers. The bottom solenoid are for intake.
Don't forget to swap over the electrical connection plugs on the engine over. Hope it makes sense? Do one side to start with, then take reading. If the values follow, replace the solenoids.
Then take reading and see if the values follow. The exhaust solenoids are the ones at the top of the camshaft covers. The bottom solenoid are for intake.
Don't forget to swap over the electrical connection plugs on the engine over. Hope it makes sense? Do one side to start with, then take reading. If the values follow, replace the solenoids.
Oil has ceratec in it so the smell is a different, as the car ran for a few weeks with both bank too rich and -25 and -30 it could be that the oil is contaminated but im not sure
I understand ill swap the solenoid plugs
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