Audi A4 B5 1.8TQ AEB boost problems
#1
10-02-2015, 02:09 PM
Audi A4 B5 1.8TQ AEB boost problems
Hi all!
I have i mysterious boost problem on my AEB B5 that i need some help with to shed some light on the problem hopefully. I have searched forums far and wide for answers but i have found none. When i bought the car before summer it worked fine, boosting to approx. 1.2bar at WOT as it is chipped. But a couple of months ago it startet drop, first i got approx. 0.5-0.6bar at WOT sometimes, and 1.2bar sometimes. Then 0.5-0.6bar startet to become the norm, and i got 0.1-0.2bar sometimes. This drop in boost is intermittent, and as far as i have found there is no corrolation between the problem and driving conditions etc. I am now desperate because 0.1-0.2bar is now the norm and if im am lucy i get 0.5bar.
I have tried:
Checking for boost leaks, found none, but i am going to check again next week if i get the time.
Checking codes with VAG-COM, had active codes for MAF and N75, so those have been changed. These are the codes. This was a moth or so ago, so again going to check next week if i get the time.
00561 - Mixture Adaptation 14-10 - Adaptation Limit (Add) Exceeded - Intermittent
00575 - Intake Manifold Pressure 11-10 - Control Limit Not Reached - Intermittent
01262 - Solenoid Valve for Boost Pressure Control (N75) 26-10 - Output Open - Intermittent
16486 - Mass Air Flow Sensor (G70) P0102 - 35-10 - Signal too Low - Intermittent
Changed spark plugs, they looked good (not coked or discolored)
Checked fuel volume from pump, and injector quantity. Both OK. I have yet to check fuel pressure.
Changed fuel filter. So thats OK.
Hope i made sense, and hopefully someone has a bright idea that i might have overlooked or not tought about.
Regards
Sebastian
I have i mysterious boost problem on my AEB B5 that i need some help with to shed some light on the problem hopefully. I have searched forums far and wide for answers but i have found none. When i bought the car before summer it worked fine, boosting to approx. 1.2bar at WOT as it is chipped. But a couple of months ago it startet drop, first i got approx. 0.5-0.6bar at WOT sometimes, and 1.2bar sometimes. Then 0.5-0.6bar startet to become the norm, and i got 0.1-0.2bar sometimes. This drop in boost is intermittent, and as far as i have found there is no corrolation between the problem and driving conditions etc. I am now desperate because 0.1-0.2bar is now the norm and if im am lucy i get 0.5bar.
I have tried:
Checking for boost leaks, found none, but i am going to check again next week if i get the time.
Checking codes with VAG-COM, had active codes for MAF and N75, so those have been changed. These are the codes. This was a moth or so ago, so again going to check next week if i get the time.
00561 - Mixture Adaptation 14-10 - Adaptation Limit (Add) Exceeded - Intermittent
00575 - Intake Manifold Pressure 11-10 - Control Limit Not Reached - Intermittent
01262 - Solenoid Valve for Boost Pressure Control (N75) 26-10 - Output Open - Intermittent
16486 - Mass Air Flow Sensor (G70) P0102 - 35-10 - Signal too Low - Intermittent
Changed spark plugs, they looked good (not coked or discolored)
Checked fuel volume from pump, and injector quantity. Both OK. I have yet to check fuel pressure.
Changed fuel filter. So thats OK.
Hope i made sense, and hopefully someone has a bright idea that i might have overlooked or not tought about.
Regards
Sebastian
#2
10-03-2015, 11:40 AM
If you can't find a boost leak, I suggest looking for a loose engine wiring harness ground. Find the grounds and loosen them with a socket (even if they are tight), wiggle the wiring harness lugs on the bolt and retighten. Checking for any corrosion all the while.
I'm not that up on the turbo-ed engines so I really can't offer any other suggestions other than the usual suspects. However, one thing I can think of is that maybe the valve that limits the boost in the manifold might be stuck open a bit.
I'm not that up on the turbo-ed engines so I really can't offer any other suggestions other than the usual suspects. However, one thing I can think of is that maybe the valve that limits the boost in the manifold might be stuck open a bit.
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