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Sir Clive
#1 Posted : 08 August 2018 16:24:10(UTC)
Sir Clive

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good afternoon

 

can anyone help me..

 

i have a 1.8 mx5 2006 that is new to me

i noticed the other day (because my wife pointed it out) that when driving the needle on my oil pressure gauge fluctuates. Basically when I accelerate the needle goes up and when I take my foot of the accelerator the needle drops back down....on my other cars the needle stays put in same place

 

is this fluctuation normal on a mk3 mx5?.

 

any advice would be appreciated

 

regards

 

Sir Clive

MickAP
#2 Posted : 08 August 2018 16:25:53(UTC)
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It's normal, no worries.

Current car...07 plate True Red Sport. MeisterR's, Colbalt rear box, Royal Steering Wheel retrim.
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Sir Clive on 08/08/2018(UTC)
andy1964
#3 Posted : 08 August 2018 18:37:57(UTC)
andy1964

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Yep - as MickAP says, they all do that!

2012 2.0 Sportech RC, Stormy Blue
Lives in Sheffield, UK
H1S VRB
#4 Posted : 08 August 2018 18:51:55(UTC)
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As the engine spins faster, the oil pump spins faster, producing an increase in oil pressure.  Old school (eg think MGB or Midget) the gauge was fed a direct reading of oil pressure via a thin capillary tube from a sender on the block.  Then engines used an electric pressure sender which gave an electrical output to the gauge - again varying with oil pressure.  My '94 Eunos 1.8 has this type of gauge.  Later Mk1s (including my 1996) had what is basically a switch - on or off.  Any oil pressure means the gauge shows full oil pressure - pretty useless really apart from in the event of catastrophic oil loss, when the gauge will confirm what your self-destructing engine has already told you.  Mk2 oil pressure gauges likewise.

I believe that from the Mk3 onwards the 'pressure' is derived from an engine speed function of the ECU - so it fluctuates in the correct way, with the speed of the engine, but isn't actually a true oil pressure reading.

Bottom line is - don't worry about it.  DO worry about always keeping the oil to the Max mark on the dipstick (especially your Mk3) - and observe service interval oil changes.     

Steve Clark
'94 NA 1.8 S-Special, White.
'96 NA VR-Ltd Combn B. Light Mod Mk1: 1st @2015 National, Kelmarsh Hall /2nd @2017 National, Gaydon /1st @2018 Spring Rally, Goodwood /People's Choice Award, 2018 Beaulieu Show'n'Shine /2nd @2018 National, Ragley Hall
'07 NC 2.0 Copper Red


Sir Clive
#5 Posted : 08 August 2018 19:17:21(UTC)
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Thank you so much guys...puts the mind at rest 

 

is it also normal that under hard acceleration (going up hill) that one notices smoke coming from the back of the car....never noticed it before or since 

safetymatch
#6 Posted : 08 August 2018 19:28:21(UTC)
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Originally Posted by: Sir Clive Go to Quoted Post

Thank you so much guys...puts the mind at rest 

 

is it also normal that under hard acceleration (going up hill) that one notices smoke coming from the back of the car....never noticed it before or since 

NO, sounds as though your engine is on it's way out, piston rings is my guess. due to lack of oil or not changing the oil.

Too little, too late.

 

Edited by user 08 August 2018 20:19:45(UTC)  | Reason: Not specified

Marble White icon.
Stainless quad tipped exhaust, Lowered, 17" RS alloy wheels, K+N filter and a few shiny bits.
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safetymatch
#7 Posted : 09 August 2018 06:17:36(UTC)
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Bumping this thread as the last posting by the original poster seems to have been missed and deserves more investigation.

For me his engine is on it's way to the scrap yard.

Marble White icon.
Stainless quad tipped exhaust, Lowered, 17" RS alloy wheels, K+N filter and a few shiny bits.
BLYTON stickered,i'm a record breaker!
GPS tracker fitted.
Lang'd to WIM spec's.
Ex 2.5vvt sport.
Stebel horn.
Vented bonnet.
Winner MK3 lightly modified, Kelmarsh Hall 6.9.2015.
Mozza
#8 Posted : 09 August 2018 07:48:41(UTC)
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Only worth worrying about if it's blue smoke, hard acceleration up a hill will produce more exhaust gasses.
1996 1.8 Mk1 Merlot (Merlot Pearl Metallic)
1996 1.8 Mk1 Automatic Eunos (Black)
1999 1.8is Mk2 Sport (Twilight Blue)
and a
2005 1.8 Mk2.5 Sport MP62 Supercharged in (Strato Blue).
Raymond Harper
#9 Posted : 09 August 2018 09:11:51(UTC)
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Could just be water from the exhaust which would be white smoke. Suggest you check the oil level when the car is cold and see if it goes through any oil. Some owners modify their dipsticks to make them easier to read. 

RichK
#10 Posted : 09 August 2018 17:13:10(UTC)
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I think Clives car was a forum members car and was looked after meticulously so it wouldnt be due to lack of servicing. I think also it is decatted with new ss headers, exhaust and remapped so that could possibly be something to look at.

Edited by user 09 August 2018 17:43:46(UTC)  | Reason: Not specified

ZSport Mk3 2007
Geege
#11 Posted : 11 August 2018 10:21:53(UTC)
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Originally Posted by: Raymond Harper Go to Quoted Post

Could just be water from the exhaust which would be white smoke. Suggest you check the oil level when the car is cold and see if it goes through any oil. Some owners modify their dipsticks to make them easier to read. 

Hi Raymond

May sound a silly question but what do they do to modify the dipstick as i find it hard to read accurately?

 

Geoff Minhinett
2010 MK3.5 2.0 Sport Tech Coupe in Galaxy Grey (Extra Fun Car)
2002 MK2.5 1.8VVT in Brilliant Black (Fun Car) Sold
2015 Mercedes C220 in Silver (Family Car)
coconino
#12 Posted : 11 August 2018 11:24:46(UTC)
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Hi

Have a look here: -

 

https://www.mx5parts.co.uk/dipstick-mazda-mk3-35-p-2337.html

 

Richard 

 

Fast becoming a Silver Surfer in the Thames Valley!
Black 2ltr RC ST M.Y. 2010 SmartTop module and a Cobalt rear rumble box..

Sometimes, dealing with a Main Stealer is a bit like picking up a sTURDy by the clean end!

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Geege on 11/08/2018(UTC)
Geege
#13 Posted : 11 August 2018 11:37:28(UTC)
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Thanks Richard, much appreciated.
Geoff Minhinett
2010 MK3.5 2.0 Sport Tech Coupe in Galaxy Grey (Extra Fun Car)
2002 MK2.5 1.8VVT in Brilliant Black (Fun Car) Sold
2015 Mercedes C220 in Silver (Family Car)
Raymond Harper
#14 Posted : 11 August 2018 12:01:08(UTC)
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Originally Posted by: Geege Go to Quoted Post

Originally Posted by: Raymond Harper Go to Quoted Post

Could just be water from the exhaust which would be white smoke. Suggest you check the oil level when the car is cold and see if it goes through any oil. Some owners modify their dipsticks to make them easier to read. 

Hi Raymond

May sound a silly question but what do they do to modify the dipstick as i find it hard to read accurately?

 

You get a metal file and file the rear of the dipstick .   Then make two( or three) notches one minimum then one at maximum. It is also possible to drill a couple of small holes but I prefer the file method. Photo taken with the car on a slight incline so a reading a bit high

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Edited by user 11 August 2018 12:02:36(UTC)  | Reason: Not specified

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