So when I'm stomping on it going through gears my 90 325i is hesitating in the higher rpms almost like its cutting out or slipping maybe? I dont know whats causing it. Any ideas? Hoping someone can point me in the right direction thanks in advance.
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Originally posted by Rocla -
Tired valve springs floating, common for high mileage M20. Mine does it too, that's why I will get rid of the M20 soon. -
That is not a common M20 problem, though worn valves & guides are a common problem on any high mileage engine.
More likely causes are a bad WOT switch in the TPS, aged ignition wires, distributor rotor/cap, the wrong plugs (use NGK ZGR5A), fuel supply issues (clogged filter, weak pump, bad FPR, clogged injectors), and/or a partially clogged catalytic converter.The car makes it possible, but the driver makes it happen.
Jim Levie, Huntsville, ALComment
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Originally posted by RoclaComment
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Had this problem on an eta.
Distributor cap contact points were a little corroded so I sanded them down a little and 80% of the hesitation went away; temporary fix.
1991 325iS turbo
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My car is chipped. When I add Lucas to the fuel, it stops the hesitation. I buy it by the gallon from Amazon.Comment
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Originally posted by RoclaComment
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bad afm?Comment
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well I was hoping someone would have maybe had this experience and could of narrowed it down to a couple different options but it looks like I will be chasing it down by replacing parts LOL
Originally posted by RoclaComment
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Could be bad AFM.Owner - Bavarian Restoration
BMW and European Electronics Repair and Restoration
www.BavRest.com
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If you haven't changed your plugs and gapped them correctly I would start there. It's quick and cheap and will rule out one of the potential issues. I had similar breakup problems in the high end (although I'm FI), gapping my plugs correctly fixed the issue.
If you can remove the chip or put a stock ECU in and see if the hesitation goes away.Comment
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