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Old 04-01-2019, 04:03 PM
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bcredliner bcredliner is offline
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Troubleshoot, troubleshoot, troubleshoot.

If the engine runs smooth at an idle I would expect all cylinders are functioning normal at an idle but not under a load. Under load the DME could be changing settings because of cylinder one not functioning at reading DME expects from it. I would be sure I have thoroughly troubleshooted cylinder 1 before going on to problems that would impact multiple cylinders. Cylinder 1 injector might be the problem. Might be able to verify by reading the plug after putting load on the engine several times and not letting it idle after doing so. Sometimes all you need to do is add a bottle of Techron to a full tank of quality gas and the problem will fix itself. Potential problem with the injector was mentioned earlier and how to test for bad injector but don't see where that has been addressed. If it turns out to be a bad injector I would have then all 'rebuilt'. One is often an indication the others are not far behind. I think I would do a smoke test also.
X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior

Last edited by bcredliner; 04-01-2019 at 06:09 PM.
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