I'm working on a 95 d90 3.9l v8. it runs rough when it warms up and stopped at a red light-
the oil light also flickers when it runs rough.
any help would be appreciated
Ok so revs dropping too low when warm causing inadequate oil pressure. Could be a well worn engine or as simple as an engine needing a good tune up.
How about more information? Miles? Last Maintenace detail etc
You're oil pump may need refreshing. On mine I replaced the gasket and gears but noticed that the pressure relief valve and spring would stick. So I used some fine Emory cloth to sand the valve. That solved the oil temp and pressure issue. I used rotella oil which is also good for flat tappet engines(3.9). Now idle dropping and stalling could be the vacuum to the stepper motor off of the plenum which I too experienced due to it having a crack. Now thinking about it. Oil pressure is likely flickering when the rpm's drop.
I would start with the basics first, new cap and rotor button, new plugs and plug wires. (a tune up in other words)
Next step would be to clean /replace the stepper IACV, make sure the o2's are tight. Then I would test/replace the amp module.
90% of issues like this are ignition related.
Use 10/40 oil if your not already..
Ron's suggestion is also very good. And cheap to replaced anyway if not done already.
Let us know
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