1990 BMW 325 fuel injection system

SOULWINAIRE

MEMBER
1990 BMW 325
6 CYL
2WD
MANUAL
250,000 MILES

How do you determine if injectors need replacement?

Car ran fine, then bought some fuel during real cold spell (below 32*), and car has not run right since. Took out fuel pump, cleaned screen, car ran sort of fine for a while, but now pump is howling, and it seems as though it is starving to some degree. Ran fuel cleaner through system: Lucas Bros. And it seemde to improve, but not complete. Replaced filter last year (20,000 ago).

3 Replies

DOCHAGERTY

MECHANIC
9,601 POSTS

At that mileage, have you considered replacement of the fuel pump? I would. ♥

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Monday, January 19th, 2009 AT 4:33 PM

SOULWINAIRE

MEMBER
3 POSTS

Greetings,
Thanks for taking time out to reply.

Yes I have considered it. As the one in the car now is howling. Yet, I wonder, if the injectors may need to be replaced too.

The pump started getting louder when I used some fuels that had invigorate in them (alcohol). The dealership said to use Shell, in our area and forcefully said do not use the fuel with invigorate in it, nor the local mom and pop fuels. My brother has a x5, and when he first got his truck the dealer let the fuel get too low. When we somehow got it to the gas station, fueled it, it began to make howling sounds and ran badly. He too switched fuels, and this is what made me ask is it the injectors as they sometimes act funny if contanimates get past the checs and balances and make it to them.