Question about BMW 325

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I have an 86' 235E that is dumping way too much fuel in the cylinders which is causing it to run very rich, I wanted to know what can cause this... I know the mass airflow sensor is not working at all, and I am sure that has alot if not all to do with it But I also have a flashing check engine light on the dash.... I was also wondering what kind of common problems the E30's have??

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Yes the mass of airflow sensor will cause a engine light and make it run like **** they are easy to change but not a cheap part

Posted on May 06, 2010

Testimonial: "Thank you it sounds like that is the problem ^ ^ Sorry I didnt get back to you sooner I have been busy, I will let you know if that is the problem :), I wont be able to do it for a while I have to get some money up but when I do get the MAS I will let you know how it goes ^ ^ "

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Cylinder 1 misfire detectedrich or lean air/fuel mixture fuel injecter fault and faulty crank shaft sensor


Wow... Thats a lot of diagnostic codes. First... The cyl #1 misfire will cause the Engine to run rich giving you a rich running engine. Therefore the rich lean code. This misfire on cyl #1 can also throw a crankshaft sensor code as it will slow down engine rpm. I would change the spark plug and ignition coil to cyl#1 and have the codes erased and see if that solves the problem. If not, you then need to persue any codes that may reappear.

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I'm looking to purchase a used car. I've been doing online research and saw this webpage http://www.usedcarsmells.com . They talk about exhaust color and smells. Is it true that you could tell a lot about...


Yes this is correct, you can get important information from the colour of smoke from the exhaust:

Blue/Gray Smoke: Blue/gray exhaust smoke is an indication of oil burning in the combustion chamber. These are possible symptoms and causes:
Valve Seals: Leaking valve seals will cause blue/gray smoke at startup because oil leaks past the seals into the cylinder after the engine shuts down.
Valve Guides: Excessive clearance between the valve stem and the valve guide allows oil to leak past the gap into the cylinder.
Piston Rings: Worn or damaged piston rings will cause blow-by resulting in blue/gray smoke.
Worn Cylinder Walls: Worn cylinder walls cause blow-by resulting in blue/gray smoke.
PCV System: A stuck closed PCV valve will cause excessive crankcase pressure resulting in blue/gray smoke.
Black Smoke: Black exhaust smoke is an indication of a rich fuel condition. These are possible causes:
Fuel Injectors: A leaking or dripping fuel injector will cause a rich fuel condition.
Fuel Pressure Regulator: A stuck closed fuel pressure regulator will cause a rich fuel condition.
Fuel Return: A restricted fuel return line will cause a rich fuel condition.
White/Gray Smoke: White exhaust smoke is an indication that coolant is burning in the combustion chamber. These are possible causes:
Cylinder Head: A crack in the cylinder head (around the coolant jacket) will cause coolant to enter the combustion chamber.
Engine Block: A crack in the deck of an engine block near the coolant jacket will cause coolant to enter the combustion chamber.
Head Gasket: A damaged or blown head gasket will cause coolant to enter the combustion chamber resulting in white/gray smoke coming from the tailpipe.

Jan 17, 2015 | Cars & Trucks

1 Answer

Engine light on and misfiring and want to fix this and get it running smooth


The cylinder misfires cause lean or rich
fuel trim

A constant lean on fuel trim, is a rich condition
driven lean by pcm to correct

If two cylinder are affected & are together or maybe
not ,then smoke the intake for vacuum leaks

A leaking injector is obviously a rich senerio

Converter only works with the O2 Sesnors to report
back the rich or lean to pcm

You need to get rid of the misfires before any fuel control
returns to normal

Mar 08, 2013 | Cars & Trucks

1 Answer

After resetting the computer, and 300 miles later, still get 5


Could be a bad oh tew sensirrrr, an air fuel metering device. A bad air fuel metering device can cause a vehicle to run too rich which means that it is dumping too much fuel which in tern is causing bad fuel economy okie dokie

Nov 02, 2012 | 1998 Chevrolet Metro

1 Answer

05 acura tl had both heads replaced and the rear bank is running very rich


since you have a cherry red catalyst surely you have a clogged cat and if you do emission test surely is going to indicate the catalyst. now if the one of the cylinder heads is running rich just confirm whether you have any injector with a malfunction and instead spraying the fuel is pouring the fuel and cause fuel to go through exhaust not burnt and possible that is the reason which damaged the cat.

Sep 01, 2012 | 2005 Acura TL

1 Answer

Idles rough has power f150


If exhaust is rich, you may have excessive fuel getting dumped into cylinder(s). A sicking or leaking fuel injector can cause this. How many miles are on the engine? Improperly seating valves can cause this also. Or if timing is incorrect.

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95 Tahoe 5.7 putting too much fuel in the cylinders. Noticed vehicle running extremely rouch. Changed the plugs, distributor cap, rotor button, intake manifold gasket, fuel filter, fuel pump, EGR valve,...


Pull the vacuum hose off of the fuel pressure regulator and the map sensor and if you see any fuel run out of either of them then replace the regulator.

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1 Answer

I have the 305tpi and its running rich.the guy that owned it before i did eliminated the o2's...i'm just starting to put money ikt and i want to fix this running rich problem i have...what wou


well replace oxygen sensors that would cause engine to run rich if you remove or disconnect them oxygen sensor control fuel system it will cause engine run rich open loop mode on cold engine start ups as engine warms up it will go closed loop cause leaner fuel mixture.if you replace oxygen sensors could help rich fuel problem if not you could have intake manifold leak or faulty fuel pressure regulator.

Jan 24, 2012 | 1987 Chevrolet Camaro

1 Answer

2002 pt cruiser code p0172


DTC P0172 - P0172 Fuel Trim System Rich Bank 1... this indicates that the fuel mixture is too rich, but you already know it is running rich.

A rich fuel mixture can be caused by a number of things First, I would suggest checking fuel pressure to make sure it is within normal specs If fuel pressure is too high due to a faulty pressure regulator for example, it will cause too much fuel to be entering the engine.

A leaking fuel injector can cause a rich fuel mixture, as can an injector that is stuck in the open position. When the engine is shut off, monitor fuel pressure with a fuel pressur gauge; it should remain steady.If fuel presure drops when the engine is off, then removing the fuel rail and injectors while still connected to the lines to visually check for a dripping injector may be informative.

There are several engine control system problems that can cause a rich fuel mixture; if you can obtain a scan tool that is capable of displaying live engine data you can check for these possible causes:

1) Low MAP reading; this can be due to a fault in the MAP sensor, MAP circuit, or as a result of low engine vacuum due to a restricted exhaust, jumped timing belt, or low compression on one or more cylinders caused by valve leakage or a leaking head gasket. Compression testing the engine may reveal internal mechanical problems of this type that would cause low engine vacuum. A low engine vacuum reading from the MAP makes the computer think the engine is under heavy load such as during acceleration, so it commands a rich fuel mixture in response. A vacuum leak can also result in a rich mixture for the same reason.

2) Low coolant temperature signal. This can be caused by a fault in the coolant temperature sensor circuit, faulty coolant temperature sensor, low engine coolant level, or a faulty thermostat that is allowing the engine to run too cold.

Keep us updated.

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2 Answers

The engine has to much gas running into it and is causing it to stall when put in idle and runs rough.


Seems that the fuel pressure regulator is bad, place a vise on the fuel return hose and if the car runs well replace the pressure regulator.

Jul 16, 2009 | 1995 Chevrolet Camaro

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