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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 05-18-2015, 09:43 AM
LucasZirkle LucasZirkle is offline
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massive acceleration lag

hey guys, so on my manual 325xi i can barely drive it. ill accelerate, but the car will take forever to get to ever 5/10 mph. and the few rps im at, the worst it is. once i get to lik e4th gear, its not as bad. coukd it be a really bad slipping clutch? i really dont know how to tell if the clutch is slipping or not. someone said something about vanos? that sounds like a huge project. although i just finished replacing my catalytic convertor, which entailed lifting th e engin and all. what are my options? oh ya, hopfuly its not the clutch., cuz the previous owner of it apparently snapped off all but 2 of the transmition bolts.
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  #2  
Old 05-18-2015, 10:26 AM
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1. Read the E46 Wiki !

2. Have the codes scanned (or buy a cheap ($25) scanner, and do it yourself. Report back here with any codes found.

3. Drive around 35 mph in 4th gear, and floor the throttle. If the RPMs jump way up without much increase in forward speed, you have a slipping clutch. This could be due to excessive wear of the clutch, or a hydraulic problem, possibly a sticky CDV, etc.

4. Bad VANOS seals would not cause the symptoms you`re experiencing.
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Old 05-18-2015, 10:45 AM
LucasZirkle LucasZirkle is offline
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Ok, so it's not the clutch, the rpms hardly move at all at any speed.
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Old 05-18-2015, 11:13 AM
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Quote:
Originally Posted by LucasZirkle View Post
Ok, so it's not the clutch, the rpms hardly move at all at any speed.
Get the codes scanned....a failed cam position sensor will give similar symptoms....
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Old 05-18-2015, 11:54 AM
Rob43 Rob43 is offline
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Quote:
Originally Posted by Fast Bob View Post
1. Read the E46 Wiki !

2. Have the codes scanned (or buy a cheap ($25) scanner, and do it yourself. Report back here with any codes found.

3. Drive.....

4. Bad VANOS seals would not cause the symptoms you`re experiencing.
Quote:
Originally Posted by Fast Bob View Post
Get the codes scanned....a failed cam position sensor will give similar symptoms....

Bob is correct & you need to check these, especially the codes.

************************************************** **

OP, when was the last time you did ANY type of tune up ? Also, going beyond the normal tuneup items & including such things as a Fuel Filter & Fuel Pump would probably be a Very good idea.



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Old 05-18-2015, 11:59 AM
LucasZirkle LucasZirkle is offline
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Old 05-18-2015, 11:59 AM
LucasZirkle LucasZirkle is offline
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Ok, these are my codes
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Old 05-20-2015, 11:06 PM
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the cam sensor is going bad and the computer has no idea where the cam is, usually itll just die im surprised yours ran.

and the other code is for an o2 sensor. if you just replaced the cat, that might not have been the problem, or it could be an o2 sensor on the other cat, usually they like to go at once
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