20 Most Recent 1990 BMW 525i - Page 2 Questions & Answers

Fuel Pump and fuel filter change sounds to be what the Dr ordered also change the fuel pressure regulator all at the same time. You will be 100%

Hi Undergrou, Your best way of dealing with this problem is to have a diagnostic scan carried out on the vehicle. The most common cause of the problem is a defective crankshaft or camshaft pick up sensor. Regards John

Try replacing the thermostat. It is supposed to open when the water temp reaches a certain point usually around 180 degrees. It might be stuck in the closed position.

You will need fuel line block off clamp

P0302 - misfire on #2 cylinder . Could be a bad spark plug , spark plug wire , or a bad ingintion coil , a bad fuel injector etc.... There are videos on youtube that could help you sort this out .

Check the air outlet temperatures at the vents. If they are very low, your cabin air filter might be plugged/dirty. Has any work been done on the compressor lately? dirt in the system can cause the expansion valve to malfunction.

probably bad ground on tail lights

check battery voltage disconnect battery and reconnect battery check oil level

check your cruise / speed limiter control check battery voltage check crankshaft position sensor

check ground wire

your car is dieseling running on fuel in cylinders igniting carbon in combustion chambers a good run down motorway could cure it

Hi Steve. It is an inline 6 cylinder designated as the M54 2.5liter.

There was more than one engine available for that car. You will need a copy of the original registration document. You could also look for the engine code on the engine block. But the paperwork (V5 in the UK, Pink slip in the USA), is the easiest way to do it.

check the fault codes first

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