ENGINE OIL PRESSURE

30

Asked by Apr 03, 2010 at 06:35 PM about the 1991 Mercury Capri

Question type: General

I have a '91 Mercury CAPRIS which, stock, uses an '87 MAZDA 323 DOHC 1.6L engine.  Engine oil pressure (stock dash mounted guage) varies from just about zero (warm engine at idle) - but just above guage red line - to about 25psi (cool engine) at or above 2.5K rpm.  Is ths normal for this engine?

Engine has functioned this way for most of its 79K miles.  I have not mounted a guage dirctly on the engine (in oil pressure sender port) to cross check the dash guage reading.  Am planning a cross country trip and don't like the prospect of engine freezing due tp low oil pressure.  Am running valvoline 20-50.

3 Answers

12,435

Before the trip get an exact oil pressure reading from the engine - If that is good The electrical sending unit is bad or the gauge itself. No Engine oil pressure will be near zero unless the engine is knocking like a son of a gun :) Regulating Oil pressure Cold 50-64, warm will vary on engine condition avarages around 30

1 of 1 people found this helpful.
30

Thanks Mike. Most helpful. The engine has never knocked. At cold light off today (ambient temp 48F), indicated pressure was about 50psi. Warm pressure was just about 25psi. When I stopped in traffic (engine at idle) pressure dropped to just over an indicated zero (no knock). When I resumeed speed (about 45mph - tach around 2.5K -)indicated pressure climbed clear to about 5psi. I've arranged to instrument the engine to determine actual pressure. If it varies as the guage indicates, I'm in it for relief valve repair. If it doesn't, I'll do the diagnostic on the guage, as outlined in the car shop manual. If the guage passes, I'll need and oil pressure sender which nobody I've been able to find(parts outfits-dealers) around here (LA area) has or can identify. Any clue where I can get one? Thanks again for your prompt, helpful, response. George

2 of 2 people found this helpful.
30

Mike, Oil pressure is sat. Proceeding from a finding that the CAPRIS is built on a 1987 Mazda 323 platform, and suspecting that the original Miata probably used, basically, the same engine, I came up with an oil pressure transmitter from Mazda (at no trivial expense). The winding in the original one was worn through by the its wipers producing the symptom of variable and very low to no oil pressure. I needed half shafts for the same vehicle. Miata half shafts were an exact fit. I needed a replacement left side window switch. The switch for an early Mazda MPV (available from Mazda) solved that problem. Thanks again for your interest and your help. George

1 of 1 people found this helpful.

Your Answer

Capri

Looking for a Used Capri in your area?

CarGurus has 24 nationwide Capri listings and the tools to find you a great deal.

ZIP:

Mercury Capri Experts

  • #1
    jogger
    Reputation
    280
  • #2
    tuff4x4
    Reputation
    190
  • #3
    dandyoun
    Reputation
    110
View All

Related Models For Sale

Used Ford Mustang
601 Great Deals out of 39,958 listings starting at $1,895
Used Mercury Cougar
183 listings
Used Chevrolet Corvette
170 Great Deals out of 17,441 listings starting at $3,000
Used Chevrolet Camaro
442 Great Deals out of 31,892 listings starting at $1,450
Used Pontiac Firebird
7 Great Deals out of 762 listings starting at $3,800
Used Jaguar XJ-Series
54 Great Deals out of 2,194 listings starting at $1,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.