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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 04-16-2005, 09:24 PM   #1 (permalink)
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ok so my exhaust was vibrating cause my CAT heat shield was punctured...so i went to a muffler shop to have it changed...he told me its fine and that i should jsut cut off the heat shiled which was making the weird noise during acceleration. I also noticed the CAT/Exhaust had a weird smell to it...cant describe it. I know its coming from exhaust though. So the muffler guy told me that the engines getting to much fuel....and its not burning it all. Could this be due to my TMS chip..since it adds more fuel and air aprently to my mixture?

I would think they thought about this kind of problem....


so what do u guys think..whats the smell from.
If its gettting to much fuel how can i fix it?
Should i take it to a mechanic..my dad said he might be able to adjust it...


???
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Old 04-17-2005, 09:28 AM   #2 (permalink)
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Does the smell, smell like rotten eggs kind of? That smell is one sign of a cat going bad.
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Old 04-17-2005, 05:04 PM   #3 (permalink)
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not of rotten eggs yet....the guy said my cat will go bad though if i dont fix the problem....maybe ill cut the whole thing off after i fix the engine prob and just get a new exhaust.
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Old 04-17-2005, 05:51 PM   #4 (permalink)
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you can't cut off the cat...won't pass smog without it.

But you chip could be adding more fuel to your engine to reach a better fuel to air ratio for more power. But not sure how your chip works exactly
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Old 04-17-2005, 06:53 PM   #5 (permalink)
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your engines running rich, check your plugs they might not be providing enough spark to ignight all the fuel. or you could adjust your afm
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Old 04-17-2005, 08:10 PM   #6 (permalink)
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I'd do some new plugs, cap and rotor. Also unless you really know what you are doing don't mess with the AFM, that is the last thing that you should tweak to try and fix an air/fuel ratio problem.
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Old 04-18-2005, 06:49 PM   #7 (permalink)
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^^sinced i dont know waht an afm is...ill go with spark plugs and cap and rotor
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Old 04-18-2005, 07:43 PM   #8 (permalink)
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The AFM is the air to fuel mixture. But on a computer controlled car with fuel injection you are usually not able to adjust AFM unless you have a stand alone fuel system with a completely adjustable fuel map.

In other words, just get new plugs and see if that helps.

BTW when you take your old plugs out see how they look. They should not be greasy or sooty at the electrode, but rather a dull metal color. If they look like they are still good and have plenty of electrode left, approximately .040-.060" (40-60 thousandths of an inch), then you might be able to just regap them and solve the problem. Check your owners manual for gap length
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Old 04-18-2005, 10:56 PM   #9 (permalink)
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Quote:
Originally posted by RealBMW 02@Apr 18 2005, 04:43 PM
The AFM is the air to fuel mixture.
[snapback]334487[/snapback]
AFM is the air flow meter. Its the thing attached to the air box in the E30. Later cars have an AFS, air flow sensor, which is just a wire that reads how much air is going into the engine.
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Old 04-18-2005, 11:57 PM   #10 (permalink)
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Quote:
Originally posted by RealBMW 02+Apr 18 2005, 06:43 PM--><div class='quotetop'>QUOTE(RealBMW 02 @ Apr 18 2005, 06:43 PM)</div><div class='quotemain'>The AFM is the air to fuel mixture. But on a computer controlled car with fuel injection you are usually not able to adjust AFM unless you have a stand alone fuel system with a completely adjustable fuel map.

In other words, just get new plugs and see if that helps.

BTW when you take your old plugs out see how they look. They should not be greasy or sooty at the electrode, but rather a dull metal color. If they look like they are still good and have plenty of electrode left, approximately .040-.060" (40-60 thousandths of an inch), then you might be able to just regap them and solve the problem. Check your owners manual for gap length
[snapback]334487[/snapback]
[/b]

i see
Now that i think about it i had the plugs changed like 6 months ago..but hell if i know if the guy actually changed them...Ill do it myself this time.

Quote:
Originally posted by AJ's320i@Apr 18 2005, 09:56 PM
<!--QuoteBegin-RealBMW 02
Quote:
@Apr 18 2005, 04:43 PM
The AFM is the air to fuel mixture.
[snapback]334487[/snapback]


AFM is the air flow meter. Its the thing attached to the air box in the E30. Later cars have an AFS, air flow sensor, which is just a wire that reads how much air is going into the engine.
[snapback]334559[/snapback]
[/quote]
yea ok that makes sence. Yea im not fucking with the computer. Dont u need a new computer system to even try to change shit like that?
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Old 04-19-2005, 10:47 AM   #11 (permalink)
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Old 04-19-2005, 08:23 PM   #12 (permalink)
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Quote:
Originally posted by AJ's320i+Apr 18 2005, 09:56 PM--><div class='quotetop'>QUOTE(AJ's320i @ Apr 18 2005, 09:56 PM)</div><div class='quotemain'><!--QuoteBegin-RealBMW 02@Apr 18 2005, 04:43 PM
The AFM is the air to fuel mixture.*
[snapback]334487[/snapback]
AFM is the air flow meter. Its the thing attached to the air box in the E30. Later cars have an AFS, air flow sensor, which is just a wire that reads how much air is going into the engine.
[snapback]334559[/snapback]
[/b][/quote]

yes you are correct sir. I was drunk when I replied and the letters seemed to fit :P
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