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The BMW Range
5 Series
E34
RPM slow to drop to idle
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<blockquote data-quote="deepblueE34" data-source="post: 729710" data-attributes="member: 25014"><p>Here is an update.</p><p></p><p>Finally took it to another "bmw specialist" <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" />. He said could be one of two things throttle cable or ICV. I have been wanting to change the throttle cable for some time because it looks pretty bad, so I thought lets give it a shot. Long story short after 5 hours (mostly waiting for parts), a 2nd hand ICV, a new throttle cable and some carburetor cleaner (~RM450), the issue persists <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown :(" loading="lazy" data-shortname=":(" />. I'm very disappointed.</p><p></p><p>Today on one occasion at the traffic light the RPM surged all the way to 4K and stayed there until I had to kill the engine. This is a new symptom. I went back to the "BMW specialist" and he suggested I leave the car with him to give him a time to diagnose the problem. I will skip my "bwm specialist" rant for now <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" />.</p><p></p><p>My old mechanic says it could either be the MAF sensor or throttle body.</p><p></p><p>I'm stumped. What else should I try?</p><p></p><p></p><p>PS. Does anyone here have an extra MAF that I can borrow to test with? And while we are at it, how about an M50B20TU ECU (siemens)? That would be great!</p></blockquote><p></p>
[QUOTE="deepblueE34, post: 729710, member: 25014"] Here is an update. Finally took it to another "bmw specialist" :). He said could be one of two things throttle cable or ICV. I have been wanting to change the throttle cable for some time because it looks pretty bad, so I thought lets give it a shot. Long story short after 5 hours (mostly waiting for parts), a 2nd hand ICV, a new throttle cable and some carburetor cleaner (~RM450), the issue persists :(. I'm very disappointed. Today on one occasion at the traffic light the RPM surged all the way to 4K and stayed there until I had to kill the engine. This is a new symptom. I went back to the "BMW specialist" and he suggested I leave the car with him to give him a time to diagnose the problem. I will skip my "bwm specialist" rant for now :). My old mechanic says it could either be the MAF sensor or throttle body. I'm stumped. What else should I try? PS. Does anyone here have an extra MAF that I can borrow to test with? And while we are at it, how about an M50B20TU ECU (siemens)? That would be great! [/QUOTE]
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E34
RPM slow to drop to idle
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