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The BMW Range
5 Series
E28
E28 not so smooth
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<blockquote data-quote="525iBoy" data-source="post: 71293" data-attributes="member: 1183"><p>AHH , e28 brings back fond memorie of my 84 520i with zender kit and 16" BBS alloys... have much regrets selling it 6 years ago....bloody reliable cars and good for taking out perdana V6s, .....should have m35'd it!!</p><p></p><p>OK.if it is running so smoothly sometimes you can count any serious mechanical issues out of the question <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /> . It therefore has to be either Fuel or Ignition.</p><p></p><p>Don't complicate thing!! :blink: </p><p></p><p>It's 99% a fuel issue as that was what caused it to stop the last time. SO No need to make life complicated. Your mechanic has already shown you it it's the fuel relay by bypassed the relay and demonstrating its' runs perfectly. Dont complicate LAH!! no need to second guess & make hypothes it is something else. Cause and effect is the key rule in problem solving.- unless you distrust him so much and if you do you prob should'nt be going to him anyways..</p><p></p><p>matter of fact I had a similar problem with fuel relays on my older continental cars and now treat fuel relays as a maintenance item ever 7 yrs!! btw Fuel relays lead a hard life as they a mechanical item so changingit on a 20 year old car is not a bad thing.</p><p></p><p>And yes! fuel flow will affect smoothness and throttleing since an engine is essential a devise for delivering fuel with air and igniting it!!! </p><p></p><p>your injectors are basically electro magnetic actuator that deliver fuel by opening for a precise time. Without adequate fuel pressure they are unable to deliver the right amount of fuel and deliver it is a right spray patten. Your engine sensor will adapt to the former, but only within limits and after a few minutes of gathering data. in the meantime you engine will run lean (no power, hesitation) and then when fuel pressure is restorred prob rich (surging - no power etc) - until data is gathered again to vary fuel...and the probl the cycle begins again if fuel pressure incorrect.</p><p></p><p>IMHO best to take to an experience BMW mechanic such as eg M-1, BMW world etc.</p></blockquote><p></p>
[QUOTE="525iBoy, post: 71293, member: 1183"] AHH , e28 brings back fond memorie of my 84 520i with zender kit and 16" BBS alloys... have much regrets selling it 6 years ago....bloody reliable cars and good for taking out perdana V6s, .....should have m35'd it!! OK.if it is running so smoothly sometimes you can count any serious mechanical issues out of the question :D . It therefore has to be either Fuel or Ignition. Don't complicate thing!! :blink: It's 99% a fuel issue as that was what caused it to stop the last time. SO No need to make life complicated. Your mechanic has already shown you it it's the fuel relay by bypassed the relay and demonstrating its' runs perfectly. Dont complicate LAH!! no need to second guess & make hypothes it is something else. Cause and effect is the key rule in problem solving.- unless you distrust him so much and if you do you prob should'nt be going to him anyways.. matter of fact I had a similar problem with fuel relays on my older continental cars and now treat fuel relays as a maintenance item ever 7 yrs!! btw Fuel relays lead a hard life as they a mechanical item so changingit on a 20 year old car is not a bad thing. And yes! fuel flow will affect smoothness and throttleing since an engine is essential a devise for delivering fuel with air and igniting it!!! your injectors are basically electro magnetic actuator that deliver fuel by opening for a precise time. Without adequate fuel pressure they are unable to deliver the right amount of fuel and deliver it is a right spray patten. Your engine sensor will adapt to the former, but only within limits and after a few minutes of gathering data. in the meantime you engine will run lean (no power, hesitation) and then when fuel pressure is restorred prob rich (surging - no power etc) - until data is gathered again to vary fuel...and the probl the cycle begins again if fuel pressure incorrect. IMHO best to take to an experience BMW mechanic such as eg M-1, BMW world etc. [/QUOTE]
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