Any idea whats the solution to this? 4.2 Engine backfires/sluggish/unstable
01-21-2019, 02:46 AM
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Solved: Any idea whats the solution to this? 4.2 Engine backfires/sluggish/unstable
2006 A8 L 4.2 BFM engine
I'm having the exact problem as the thread below and it totally disappears when fuel gets to 1/4 or less. Been through 4 sets of used fuel pumps but no change to the problem, so it couldn't be the fuel pumps. What do you guys think?
Link to the thread:
4.2 Engine backfires/sluggish/unstable when accelerating
I'm having the exact problem as the thread below and it totally disappears when fuel gets to 1/4 or less. Been through 4 sets of used fuel pumps but no change to the problem, so it couldn't be the fuel pumps. What do you guys think?
Link to the thread:
4.2 Engine backfires/sluggish/unstable when accelerating
Last edited by Ste4lth; 04-29-2019 at 06:05 AM. Reason: Solved by replacing fuel pumps with new units.
01-21-2019, 05:46 AM
#2
AudiWorld Wiseguy
Unplug the MAF and drive it around, see if it helps. If it does, time for a new MAF.
It’ll throw some codes when doing this, but the ECU will revert to a safe baseline fuel map without the MAF that is still able to run the engine smoothly, albeit not optimally, so it’s a good diagnostic technique.
It’ll throw some codes when doing this, but the ECU will revert to a safe baseline fuel map without the MAF that is still able to run the engine smoothly, albeit not optimally, so it’s a good diagnostic technique.
