Unstable idle and slow engine speed

Vince86 · 04-04-2021, 12:55 PM

from time to time the idle is unstable on the other hand as soon as I put the gas to the idle the engine speed takes time to go down and sometimes even remains blocked ...

Ajolives · 04-04-2021, 01:06 PM

Quote:

Originally Posted by Vince86

from time to time the idle is unstable on the other hand as soon as I put the gas to the idle the engine speed takes time to go down and sometimes even remains blocked ...

Culprits are spark or fuel dude. If you're looking to turn wrenches, change the plugs, low/hi fuel pressure sensors in engine bay and take it from there. Could also be a vacuum issue but the former are more common.

Vince86 · 04-04-2021, 01:30 PM

ok because the only fault code I have are the 27BA and 27BB which apparently have a link with the low fuel pressure sensor

Vince86 · 04-04-2021, 01:38 PM

Is there also a high pressure fuel sensor? Because the low pressure is located near the air filter unit but where is the high pressure if there is one?

04-04-2021, 12:55 PM	#1
Vince86 Registered 0 Rep 3 Posts Drives: Bmw m3 e92 Join Date: Apr 2021 Location: France iTrader: (0)	Unstable idle and slow engine speed from time to time the idle is unstable on the other hand as soon as I put the gas to the idle the engine speed takes time to go down and sometimes even remains blocked ...
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04-04-2021, 01:30 PM	#3
Vince86 Registered 0 Rep 3 Posts Drives: Bmw m3 e92 Join Date: Apr 2021 Location: France iTrader: (0)	ok because the only fault code I have are the 27BA and 27BB which apparently have a link with the low fuel pressure sensor
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04-04-2021, 01:38 PM	#4
Vince86 Registered 0 Rep 3 Posts Drives: Bmw m3 e92 Join Date: Apr 2021 Location: France iTrader: (0)	Is there also a high pressure fuel sensor? Because the low pressure is located near the air filter unit but where is the high pressure if there is one?
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