I have a 1988 BMW 325ic. When I first start it in the morning it takes about 6-8 seconds of cranking before the engine turns over and starts. If I shut it down an restart it in a few minutes it works fine. If I leave it off for an hour or so it takes 6-8 seconds of cranking before it starts again. Where should I look to fix this problem?
Loss of rest pressure due to a bad checkvalve is common and is located near the fuel pump.
Or a bad cold start injector or temp sensor.
I had this exact problem on my 87 325i, its was a leaky injector causing 2 problems it would slowly flood the engine, also, when cranking you will have to build the fuel pressure right up again. I replaced the injectors and the problem went away instantly. Could also be old/cracked rubber fuel lines. replace them if they look bad. Just get some
8mm hose rated to atleast 3 bar and its any easy fix.MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.