1992 e36 325i poor econony/ running

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  1. 1992 e36 325i poor econony/ running 
    #1
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    acctyii's Car Details
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    Hi my 325 is very bad on fuel about 15mpg an when on idle is lumpy more so when hot than cold!Have tried a idle valve and throttle switch but no joy have also run carsoft diagnostic but dme comes back ok no faults so lost cant afford to keep changing bits very exspensive parts can anyone help please!
     
     

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    #2
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    xXxStKxXx's Car Details
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    Waht diagnostics equipment are you using?I would use a BMW specific one and get a live data done too which may shed more light on your problem
     
     

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    acctyii (24-02-2010)

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    #3
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    hi am using bmw carsoft but cant get live data from car wich is another prob i have!it does through codes if you disconnect somthing while running but sais all ok when all connected wish could get live data as sure it would be helpfull thanks for help.
     
     

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    Lambda sensors are a common fault & could cause rich fuelling. EGR valve could also have something to do with it being lumpy but I doubt it would cause rich fuelling. Its only an idea but you could try using BG 44K fuel additive which will clean all the necessary parts in the entire fuel system. Have you looked at your air filter?
     
     

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    acctyii (24-02-2010)

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    Get an emission test done if you can. That will tell you immediately if you're running rich or not (Lambda reading less that 1.0 means it's running rich). If you've done anything over 80,000 miles then it's likely to be lambdas.
     
     

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    Quote Originally Posted by e36coupe View Post
    Get an emission test done if you can. That will tell you immediately if you're running rich or not (Lambda reading less that 1.0 means it's running rich). If you've done anything over 80,000 miles then it's likely to be lambdas.
    An emissions test could also diagnose a faulty catalytic converter too among many things so it may not be suitable for directly diagnosing rich fuelling.
     
     

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    Quote Originally Posted by StK View Post
    Waht diagnostics equipment are you using?I would use a BMW specific one and get a live data done too which may shed more light on your problem
    As STK has said get it live read to find out what is up as it could be any number of things.
     
     

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    acctyii (24-02-2010)

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    Quote Originally Posted by dane36323 View Post
    An emissions test could also diagnose a faulty catalytic converter too among many things so it may not be suitable for directly diagnosing rich fuelling.
    That's correct but a faulty cat will not effect the lambda reading since it only removes CO, so an elevated CO reading with lambda and HC readings normal would suggest cat problems.
    Also a faulty cat will not effect the running of the engine. Faulty Lambda sensors will also result in increased CO and HC as the overfueling will result in incomplete conbustion.
     
     

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    thanks for info car has done 134k have put redex through to try clean injectors checked plugs seem good colour will have to get it into a gararge to run some checks shame my reader wont give live data,only other thing could try is i have a used cam sensor!but am just guessing at this in desperation!!!!oh yes have replaced standard filter with k&n panel one breathes better but not helping prob!Also not sure because first 1 ive owned but think it might be lacking on power for 192 hp car i had before was mazda mx5 125hp and this is not alot faster!
     
     

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    Quote Originally Posted by e36coupe View Post
    That's correct but a faulty cat will not effect the lambda reading since it only removes CO, so an elevated CO reading with lambda and HC readings normal would suggest cat problems.
    Also a faulty cat will not effect the running of the engine. Faulty Lambda sensors will also result in increased CO and HC as the overfueling will result in incomplete conbustion.
    I didnt say it would, a Lambda sensor measures the oxygen content of the exhaust gases sending a signal to the ECU to correct the fuel/air ratio. A faulty cat could effect a post cat lambda sensor.
     
     

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