Hello, I have a starting problem on my 92 SE500 W140. it just starts and runs poorly at idle, it smells of petrol and the spark plugs get completely wet. My Star tester with HHT-Win sets no codes at all. I have tested all my injectors and the are good, I have replaced all ignition parts and I have replaced all rubber and gaskets on my inlet manifold Do any of you have any views on this issue?
-
Hi Guest !
Welcome to the 500Eboard forum.
Since its founding in late 2008, 500Eboard has become the leading resource on the Internet for all things related to the Mercedes-Benz 500E and E500. In recent years, we have also expanded to include the 400E and E420 models, which are directly related to the 500E/E500.
We invite you to browse and take advantage of the information and resources here on the site. If you find helpful information, please register for full membership, and you'll find even more resources available. Feel free to ask questions, and make liberal use of the "Search" function to find answers.
We hope you will become an active contributor to the community!
Sincerely,
500Eboard Management
M119 runs poorly, wet spark plugs
- Thread starter Svein R
- Start date
Did you verify fuel injector wire signal pulse too?
And as Gerry says that all ignition cables are correctly routed.
If all 8 plugs are firing, and the plugs are wet, and exhaust smells of fuel... the mixture is excessively rich. Need more data... any change if you disconnect the MAF? How old is the O2 sensor? Do you have a spare M119 LH module (any module / any displacement) for testing? Checked for vacuum leaks?
Insulators??
Some guy made this thread
FYI - Essential M119 Ignition "Tune Up" mods [Distributor cap vent / slot] | M119 Engine
Hi all, I have been meaning to address this on my little used 500E for years.... it is a problem I myself recognised about 5 years ago when I first looked at an m119 distributer cap..... Compare to any other distributor cap of the era such as an m104 and you will see there are NO ventilation...
www.500eboard.co
56psi when cranking
Yes should hear constant buzzing and it should move with throttle. Test video I made before
just the way mine works too, thanks for a nice video
No it was connected
I would try the following things:
1. engine start without MAF. If the engine runs ok, probably the MAF is defective. If not:
2. ignition on and moving the gas cable by hand until the ETA is electrically out of function.
3. Start the engine. If the engine will run ok, the ETA should be the problem.
1. engine start without MAF. If the engine runs ok, probably the MAF is defective. If not:
2. ignition on and moving the gas cable by hand until the ETA is electrically out of function.
3. Start the engine. If the engine will run ok, the ETA should be the problem.
Okay, so what’s right then? It should go by motor when I move the throttle arm on the accuator
1. Engine won’t start with or without MAF
2. I moved the gas with hand until it shuts down electrically and tried to start, no start at all.
This is a 92 model, where are the O2 sensors located?
Attachments
Do you mean the nozzles?
Harness is brand new, nozzles are bench tested
There may not be any. IIRC that requirement came after '92. My '92 500E doesn't have them. You would see them underneath the car in front of the converters. Assume you don't have them.
maw
then probably the LH module is bad.
Yes, I found one in front of catalyst
Where can I get me a LH module?
eBay has a gracious plenty. Post your part number to confirm compatibility, but here's an example ... MERCEDES CONTROL MODULE 140 545 76 32 | eBay
There are others with different part numbers so it's very important to check your part number.
maw
Thanks
Just be sure you check part number compatibility because these sellers don't always know.Thanks
Also, if you or someone you know is skilled at rebuilding or repairing computers or audio equipment, yours can perhaps be rebuilt. What goes bad are the Fraco capacitors inside the LH module. It's a known issue at this age and many of us have rebuilt LH modules. So you could have yours rebuilt as such. Search the forum for "capacitor". Also check the for Parts for Sale forum here, as there may be one or two LH Modules available. If I could, I'd buy here rather than eBay, and you're likely to need to rebuild any you get off eBay anyway, if not now then soon enough.
IIRC the '92 500E LH module was compatible with the W140 cars, both sharing WOT enrichment. But do some research here, as it's all been covered ad nauseum.
Sample search results... Search results for query: LH part number W140
GL
maw
Last edited:
Have an assitant move the throttle pedal inside the car with the ignition on. Observe the ETA. It should always move and emit noise. If it clicks and goes dead then you have a problem.
Notes:
Throttle pedal must be depressed when testing ETC otherwise ECU will see switch is closed and trip it out.
ETA will never open fully with engine off - this is normal and because engine ECU does not see RPMs.
Also confirm ALL ECUs within the coffin box are fully and firmly seated down in correctly. Also check all fuses within the Base Module and Fuse box in car.
Excellent point. Let's back up. Was it running perfectly and then one day ran terrible?
Or had you done work and it hasn't run properly since working on it?
Etc...
Thanx I will check this
I have never heard it runs properly, this car had been sitting for a long time.
Been this way since I purchased it, it’s been sitting for a long time before I purchased it.
