Hi all,
Got an issue ive been chasing for months on this car, never been able to find it.
The first start after sitting for a few hours will be a bit rough for a couple seconds, if you hold throttle open a bit when starting it makes this issue worse, so it is light on for fuel. The pressure is dropping over time.
After the engine starts, it will run rough for 1-3 seconds, then is perfect.
The injectors were removed and cleaned, but 5 failed the leak test, so i replaced all 8.
The fuel pump has been replaced with a genuine Pierberg.
The filter has been replaced twice, once with a Hengst, once with a Mann.
Turning key on you hear pump run for about 1 second. Id expect it should run longer than that, but anyway, its not long enough to get enough fuel up there for cold start.
If i start the engine, then shut it off after 3-4 seconds, then restart, it starts perfect. It always runs perfect too, never an issue. Its just that first start after a few hours sitting.
Im not sure where it would be losing pressure. Is there a non-return valve in the fuel line somewhere that could be allowing pressure to drop?
Cheers all
Got an issue ive been chasing for months on this car, never been able to find it.
The first start after sitting for a few hours will be a bit rough for a couple seconds, if you hold throttle open a bit when starting it makes this issue worse, so it is light on for fuel. The pressure is dropping over time.
After the engine starts, it will run rough for 1-3 seconds, then is perfect.
The injectors were removed and cleaned, but 5 failed the leak test, so i replaced all 8.
The fuel pump has been replaced with a genuine Pierberg.
The filter has been replaced twice, once with a Hengst, once with a Mann.
Turning key on you hear pump run for about 1 second. Id expect it should run longer than that, but anyway, its not long enough to get enough fuel up there for cold start.
If i start the engine, then shut it off after 3-4 seconds, then restart, it starts perfect. It always runs perfect too, never an issue. Its just that first start after a few hours sitting.
Im not sure where it would be losing pressure. Is there a non-return valve in the fuel line somewhere that could be allowing pressure to drop?
Cheers all
Quote:
See attached:Originally Posted by Plutoe
Post your VIN!
Youre unlikely to confuse me with anything you tell me, but thanks all tge same 
Its not a mixture issue, its a leakdown issue. No pressure in rails.
Its not a mixture issue, its a leakdown issue. No pressure in rails.
DRBC43AMG
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Have you tried connecting a pressure gauge in the fuel rail to monitor real data? I believe there is a port for this somewhere...
Quote:
Yeah there is one front driver side of the rail, but i dont have a gauge.Originally Posted by DRBC43AMG
Have you tried connecting a pressure gauge in the fuel rail to monitor real data? I believe there is a port for this somewhere...
If i press the valve within a couple minutes of shut off, plenty of pressure there, but after about 2 hrs, just a trickle.
Well i can add a bit to this, took it into a mate's workshop and threw his fuel gauge on it, started up for 10 seconds then left it sit for 30 minutes.
Fuel pressure stayed around 55psi even 30 minutes after shut down.
The shrader valve was not real tight, so that could be where the fuel pressure is leaking down.
Fuel pressure stayed around 55psi even 30 minutes after shut down.
The shrader valve was not real tight, so that could be where the fuel pressure is leaking down.
DRBC43AMG
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Likes:727
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Liked:323 Times in 268 Posts
Quote:
Fuel pressure stayed around 55psi even 30 minutes after shut down.
The shrader valve was not real tight, so that could be where the fuel pressure is leaking down.
Interesting find and problem solution related to the schrader valve Originally Posted by W202AMG
Well i can add a bit to this, took it into a mate's workshop and threw his fuel gauge on it, started up for 10 seconds then left it sit for 30 minutes. Fuel pressure stayed around 55psi even 30 minutes after shut down.
The shrader valve was not real tight, so that could be where the fuel pressure is leaking down.
Keep us posted please.
Will do
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Well im wondering if it was my EIS failing all along...
Im 850klms from home, none of my 3 keys work. Nothing. Dead. Battery fine, seats work.
Stopped to fuel up, wouldnt start after, and still does nothing 4 hours later.
Im 850klms from home, none of my 3 keys work. Nothing. Dead. Battery fine, seats work.
Stopped to fuel up, wouldnt start after, and still does nothing 4 hours later.
