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


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.

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.

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

Add photo

Related Questions


    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 gua...

    1991 Mercury Capri



  • Engine temperature 1 answer

    any boy can tell me what is the standard engine temp for a 1991 Capri turbo?

    1991 Mercury Capri 2 Dr XR2 Turbo Convertible



  • was the capri engine a blue colr 2 answers

    someone I know has a black 1980 capri. I looked under the hood and the engine was blue. I asked him if the engine had been changed and he said no..Was this what the original engines looked like??? I ...

    1980 Mercury Capri



  • Why does my 1993 mercury capri engine shut off when automatic transmission is put in any gear? 3 answers

    My 1993 mercury capri starts & idles perfectly. I can also "rev" engine to high RPMs with no problem when transmission is in "N" or "P". However, when transmission is put in any gear the engine shuts ...

    1993 Mercury Capri 2 Dr STD Convertible



  • were is the oil pressure sending unit located 2 answers

    1991 Mercury Capri 2 Dr XR2 Turbo Convertible




Looking for a Used Capri in your area?

CarGurus has 25 nationwide Capri listings and the tools to find you a great deal.


Search Mercury Capri Questions

Mercury Capri Experts

#1 jogger
Reputation 270
#2 tuff4x4
Reputation 190
#3 dandyoun
Reputation 110
View All

Related Models For Sale

Used Ford Mustang
682 Great Deals out of 44,475 listings starting at $1,500
Used Mazda MX-5 Miata
80 Great Deals out of 3,937 listings starting at $1,800
Used Chevrolet Corvette
218 Great Deals out of 22,161 listings starting at $3,750
Used Jaguar XJ-Series
44 Great Deals out of 2,706 listings starting at $1,599
Used Chevrolet Camaro
373 Great Deals out of 31,227 listings starting at $2,500
Used Ford Taurus
280 Great Deals out of 18,746 listings starting at $1,499
Used Land Rover Range Rover
110 Great Deals out of 4,756 listings starting at $2,500
Used BMW 5 Series
483 Great Deals out of 16,405 listings starting at $650
Used Ford Bronco
194 listings
Used Lexus LS 400
213 listings starting at $2,700

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.