Question about 1995 BMW 5 Series

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My bmw 520i ignition fluctuates its not stable. i have changed the air valve, air, flow meter and again the contro board but its still the same. what might be the problem?

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  • BMW Master
  • 19,396 Answers

Check the EGR valve. If it is defective it causes engine revving up and down.

Posted on Mar 21, 2011

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1 Answer

Engen problem and missing


Sir, your question is not very clear, but I will still try to post a solution here. Engine missing could be due to any problem in fuel system, ignition system, engine or ECM as well.

LOW ENGINE IDLE SPEED (Poor idling):
-Throttle body (do the cleaning and idle speed learning)
-A /C signal circuit
-Fuel pump control circuit
-Fuel pump
-Intake system
-P C V valve (clogged or open) and hose

ROUGH IDLING:
-Cylinder Compression
-Ignition system (Igniters, spark plugs, wiring harness)
-Spark plug fouled, gap too wide or too short. (1.00-1.1 mm)
-Fuel injector circuit
-E C M power source circuit
-Fuel pump control circuit
-Fuel pump (required pressure 44 psi - 49 psi)
-Throttle body (cleaning)
-Intake system
-P C V valve and hose
-Air fuel ratio sensor
-Heated oxygen s ens or
-Mass air flow meter
-Idle hunting
-Throttle body
-Intake system
-P C V valve and hose
-Air fuel ratio sensor
-Mass air flow meter

HESITATION/ POOR ACCELERATION:
-Fuel pump control circuit
-Fuel pump
-Spark plug
-Ignition system
-Fuel injector circuit
-E C M power source circuit
-Mass air flow meter
-Throttle body (do cleaning)
-Intake system
-Valve timing
-Cylinder Compression


Jan 18, 2014 | 2008 Toyota Corolla

1 Answer

1979 bmw 528i starting problem


This vehicle uses a thermotime switch for the cold start valve,located on the radiator,but you say you have fuel pressure and volume so go to the Vane airflow meter, when the airflow meter sweeps open it gives more fuel. so you need to make sure the vane air flow meter can sweep without interruption.

Nov 12, 2012 | BMW Cars & Trucks

1 Answer

Hi I have a 2001 BMW 520i. It wont start. Stopped whilst driving felt like I had run out of fuel. I have had fuel pump changed fuel filter changed spark plugs coil leads. Pressure tested and fuel is there...


Never rule out sensors, based on the fact they sometimes
work or you have spark

You need an oscilloscope and look for milli second
misses and spikes

Use the scope on everything,fuel pump etc

Feb 11, 2011 | 1999 BMW 5 Series

1 Answer

P reg 520i, water is not going round the engine, changed the water pump & thermo, heater not blowing warm, but not overheating.


if its not overheating your water is circulating and working normally
your heater core or rad could be airlocked open a top heater hose and fill slowly making sure no air in system run for a while then top up can take a while to clear the air
also make sure heater valve is operating

Feb 10, 2011 | BMW 5 Series Cars & Trucks

1 Answer

I WAS TOLD THAT I NEED A NEW MASS AIRFLOW SENSOR IN MY 1998 CADILAC CATERA. I GOT IT OUT NOW I NEED TO KNOW HOW TO TEST IT.


Hello there :
Inspect for dust or contaminants on the sensor: see the picture with the arrow.
Using an ohmmeter, measure the resistance between terminals THA and E2. Resistance: At -20 °C (-4 °F) 13.6 - 18.4 KOhm At 20 °C (68 °F) 2.21 - 2.69 KOhm At 60 °C (140 °F) 0.49 - 0.67 KOhm

Attachment 5512

2. Inspect the intake air flow meter operation.

1. Connect the intake air flow meter connector.
2. Turn the ignition switch to ON.
3. Using a voltmeter, connect the positive (+) tester probe to terminal VG, and negative (-) tester probe to terminal E2G.
4. Blow air into the intake air flow meter, and check that the voltage fluctuates.

Attachment 5513 attachment.php?attachmentid=5512&stc=1&d=1196953872 attachment.php?attachmentid=5513&stc=1&d=1196953984 Attachments: f

Jan 26, 2011 | Cadillac Catera Cars & Trucks

1 Answer

Air flow meter


air flow meters are expensive i would first replace the coolant temperature sensor

May 28, 2009 | 1996 BMW 318

3 Answers

Diagnoses : 2002 745i bmw ( hot-film air-mass flow senser )


Hot-film air mass sensor when diagnose say is damaged, replace it!!! Trouble when car will take up to 5.sec. is associated with this! Bank 1, the accumulated value of lambdasond the left side of the engine cylinders. While the problem is in the ignition at the 4th cylinder, Bank-1 data were then evaluated as poor. Allow change fourth ignition coil and the CAN mistake Dont look it! is an accidental fault! eventually allow for BMW servicing erase all the mistakes and make a new adaptation of the engine throttle body, and adaptation of the engine in to "0" setting

Mar 02, 2009 | 2002 BMW 7 Series

2 Answers

Bmw 520i Revving problems


first i would look for leaks in the intake boot. could also be caused by the idle valve.

Jul 17, 2008 | 1999 BMW 5 Series

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