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Brad, ASE Certified Technician
Category: Chrysler
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Experience:  ASE Certified Master Technician
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2004 chrysler sebring: the oil pressure light started coming

Resolved Question:

...we have a 2004 chrysler sebring convertible with a 2.7 engine. recently the oil pressure light started coming on at idle with engine hot. at one time i was a mechanic, now retired, so i dedided to check it out.
1. rep laced the oil pressure switch/sending unit- light still came on @ idle.
2. installed a mechanical gage & verified that pressure actually is low (2-3 psi) @ idle, 25- 30 psi @ 2500-3000 rpm.

3.pulled oil pan & looked at 2&3 main brgs- both looked new.
4.removed oil pump & checed specs,-all well within specs & no major scoring etc.
(the engine has always run quietly- never any rattles or knocks etc.)
i wonder if there is anything about this particular ingine that would cause such a mysterious pressure drop.
Submitted: 5 years ago.
Category: Chrysler
Expert:  Brad replied 5 years ago.
Hello and welcome to!

There is a TSB posted for a wiring modification to fix issues with the pressure switch *BUT* specifications say that at idle oil pressure should not drop below 5PSI (and 45-105PSI at 3000 rpm). Since you're only seeing 2-3PSI it's pretty obvious that your oil pressure really is an issue.

I can tell you from experience that these 2.7L engines are extremely prone to having oil pressure problems. Some are due to excessive sludge build up from a ineffective PCV system. Others are due to pieces of aluminum coming loose and plugging up the works. It's also suspected that a small internal coolant leak doesn't help things any.

Here is a website dedicated to the 2.7 engine problems. It's pretty informative!

Customer: replied 5 years ago.

after reading your answer, brad, I need to add one more line:

this engine is extremely clean inside- top & bottom with no sign whatever of sludge or visible sign of restriction or water inside. Any clues?????

Expert:  Brad replied 5 years ago.
I suspect that bits of aluminum get into the oil passages and restrict flow. Have you measured the bearing tolerances?
Brad and 2 other Chrysler Specialists are ready to help you
Customer: replied 5 years ago.
upon looking into the oil pump relief valve bore with a strong light & a magnifying glass, i can see little score marks not visible to the naked eye, also marks where the spring has rubbed the wall. care to comment about this? thanks.

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