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sprinkles08, ASE Certified Technician
Category: Car
Satisfied Customers: 22815
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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I have diesel isuzu trooper. when it warms up the oil

Customer Question

i have diesel isuzu trooper . when it warms up the oil presure drops
JA: How old is your oil pump? Has the check engine light come on?
Customer: no check engine light its a diesel with a mechanical pump
JA: What year is your Trooper?
Customer: 1990
JA: Are you fixing your Trooper yourself? What have you tried so far?
Customer: bought it 2 weeks ago it didnt have a oil guage
JA: Anything else you want the mechanic to know before I connect you?
Customer: not sure
Submitted: 3 months ago.
Category: Car
Expert:  sprinkles08 replied 3 months ago.

Hello and welcome to JustAnswer!

Oil pressure will drop some when the engine is at operating temperature but I'm assuming you're losing oil pressure entirely. If that's the case and the oil level is correct then it indicates an internal engine failure.

The problem could be excessive cam or crank bearing clearance, it could be the oil pump, or the oil pump pickup may be restricted. If the pickup becomes restricted with debris such as sludge it will cause what you're having.

In more rare cases a bad oil filter could cause this.

You can try replacing the filter if you haven't already. If that doesn't help then the next step will be to remove the oil pan and inspect the pickup.

I hope that helps! My goal is your satisfaction today. If you feel I've been professional and helpful, your 5-star rating at this time is most appreciated. However, if you still need my help you can reply back here and I'll respond as soon as possible! Thank you!