89 325i, 118k on it, have a slight hesitation during acceleration from about 2-3k rpm, and sometimes when you initially depress the throttle it'll bog down until you give it more gas. just replaced the fuel tank/all fuels lines leading to tank/fuel filter, problem still exists. there's a whining sound when its running leading me to believe there's a vacuum leak, the main intake tube has some cracking/dry rot so I'm going to replace that as well as the secondary smaller tube. If that doesn't fix the hesitation/bogging, any thoughts on what it could be?
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"Once more into the fray."
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Afm out of adjustment, and likely intake leaks -
You have already identified the problem! Vacuum leaks.Comment
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The big metal box on your intake. It's a barn-door style, POS.
Search on here, there are several threads about how to clean and adjust it. But fix the intake leaks first. Having a shop run a smoke test is the only for sure way to find them all.Comment
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sounds like an autotragic
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I most certainly do NOT drive an automatic, you insult my honor sir!"Once more into the fray."
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found a vacuum leak coming from the rocker plugs on the side nearest the firewall. also, the iac motor seems to be running even when the motor is off but key is on, not sure if its supposed to do that. one other vacuum leak coming from the other side of the valve cover near the front of the motor can't tell if its actually coming from the valve cover or not. replaced main intake tube and cleaned maf sensor, still hesitating and bogging down when throttle is initially depressed quickly. thoughts?"Once more into the fray."
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Did you repair the leaks from the valve cover?Comment
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Leaks in valve cover can affect your idle big time.Comment
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