backfire and loss of power
my 91 525i backfires and looses power on fast accelerations, uphill and around 50/55 mph. I had complete tuneup done with plugs changed but no improvement...
Major Contributor
- Did you check vacuum leaks?
- Did you check coils?
- Do you have an engine code?
Can you read the engine codes anyway?
What was done in the complete tune up?
'85 Euro 635csi Race Turbo, megasquirt, Group A
'92 525i Touring 5 speed, 3.46 diff, UUC 8.5lb flywheel, soon to be turbo.
'02 Subaru WRX Wagon with STI springs, bigger sway bars
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