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Author Topic: Will Mazda Miata Oil Pressure Sender Work?  (Read 12033 times)

Rocketman

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    • 91 BPT AWD Capri & 1991 XR2
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Re: Will Mazda Miata Oil Pressure Sender Work?
« Reply #15 on: June 07, 2014, 10:37:10 AM »

It's not likely I'll be able to get to it anytime soon. I'm running out of time & money for my car projects. Have not touched the V6 since last fall. :(

As for the MACG - I don't know yet. It's a busy summer for me, I'd really like to attend. If I do go I'll probably be in my red ressurwreckted XR2 - the GTXR2 needs a complete overhaul before it can be reliably driven again.
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1.8L Turbo All Wheel Drive Capri... the "GTXR2"


mitch1204

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    • 1991 Mercury Capri NA Auto/ 1994 Mercury Capri NA
Re: Will Mazda Miata Oil Pressure Sender Work?
« Reply #16 on: June 10, 2014, 12:36:15 AM »

On the Roo-sport website they have a fix for the oil pressure issue. They said to take the ground strap off the passenger fenderwell near the strut tower to the engine and clean it good. I did that and my oil pressure gauge worked good for awhile. It drops now on occasion but works much better than it did. I noticed all my ground straps were corroded so I cleaned them all and used dielectric grease on all the connections to prevent future moisture/corrosion problems.
If that ground fix worked for awhile I'm going to change the strap and see if that helps because corrosion can build where the cable is crimped.

As far as the sending unit Advance carries them for $12

http://shop.advanceautoparts.com/c4/oil+pressure+switch-sender/-49998129?isAllVehicle=false&showTitle=&vehicleIdFromReq=21430&vehicleIdSearch=21430

The 1994 Mazda MX-3 has the same body and threads but has a blade pole instead of a round pole to connect to. I would say the same for the Miata.
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blueamber

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Re: Will Mazda Miata Oil Pressure Sender Work?
« Reply #17 on: June 10, 2014, 11:07:34 AM »

Could you supply link data to this being compatible with the Capri?  There are literally hundreds of sensors that will screw in the hole, most are dumb switches that just turn a light on and off.  I can't find any data on the WELLS  part other than fitting early 90's ford trucks...Chris
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mitch1204

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    • 1991 Mercury Capri NA Auto/ 1994 Mercury Capri NA
Re: Will Mazda Miata Oil Pressure Sender Work?
« Reply #18 on: June 10, 2014, 02:02:45 PM »

The SWE-2185 is the one I have on my car. I'll look for specs on it and cross reference it.
« Last Edit: June 10, 2014, 02:16:43 PM by mitch1204 »
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mitch1204

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Re: Will Mazda Miata Oil Pressure Sender Work?
« Reply #19 on: June 10, 2014, 03:38:22 PM »

Could you supply link data to this being compatible with the Capri?  There are literally hundreds of sensors that will screw in the hole, most are dumb switches that just turn a light on and off.  I can't find any data on the WELLS  part other than fitting early 90's ford trucks...Chris


You're correct. I'll do some deep researching on this. I do know it's a 1/4-18 fitting, it has a blade connector and the resistance is opposite from most with low readings having the greatest resistance. Then there is the sweep of the needle to take into consideration whether it's 180* or 270*.

Those I pointed out turned out to be dummy lights so I'll tell Advance.

This is going to be hard to find but not impossible.
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capriBill

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    • 1992 XR2
Re: Will Mazda Miata Oil Pressure Sender Work?
« Reply #20 on: June 12, 2014, 04:37:50 PM »

I purchased this from Ebay. It has now arrived. It is kind of big. I just have to see if I can get it to fit in the car. Have to climb underneath. I will try removing the oil filter first. This is the right kind since it is for a gauge, not a light or the dumb single position gauge that Miata starting having later.

http://www.ebay.com/itm/Engine-Oil-Pressure-Sender-With-Gauge-Standard-PS-261-/180825926259?pt=Motors_Car_Truck_Parts_Accessories&hash=item2a1a10aa73&vxp=mtr

One Miata owner did say they used a Capri sender and it worked. I am hoping the reverse is true.

I will write back after I try to get this in.
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capriBill

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    • 1992 XR2
Mazda Miata Oil Pressure Sender Does Work!
« Reply #21 on: June 12, 2014, 11:17:37 PM »

I now have it working great!  :)

I am not sure how to attach the image I have. If you send me your email, I can email it to you.

This is the part I used:
http://www.ebay.com/itm/Engine-Oil-Pressure-Sender-With-Gauge-Standard-PS-261-/180825926259?pt=Motors_Car_Truck_Parts_Accessories&hash=item2a1a10aa73&vxp=mtr

I had to remove the starter mount bar and oil filter to replace it.

It is bigger than the Capri sender, but with some work it does fit but very tightly. It did get bent a little on the top when I tightened the starter mount bar.
I found that if the starter mount bar pressed to hard against it, it caused the gauge to pin. To resolve the problem, I put a washer between the back of the starter mount bar and the engine around the bolt(s) that hold it on the bottom. The bolt is shown with the red arrow in my picture. I did strip the other bolt at the bottom, and will need another one if someone has an extra part. I learned how to install the starter mount bar to get it in with the bigger sender:
1. First put in the bottom bolts, with a washer between the mount and engine to make room for the sender, but only screw them in a little. The red arrow shows this.
2. Put the top bolts in, and tighten them. The orange arrows show this.
3. Tighten the bottom bolts. The red arrow.
4. Put in and tighten the starter bolt. The green arrow.

The sender is shown by the white arrow. If you look closely, the wire comes out pointing towards the top-right to avoid shorting against the starter mount bar.

Changes I made to it are:

1. I moved the rubber on the sender up to cover the connector so that it does not short against the starter mount bar.
2. After tightening it, I turned the connector so the wire connects from the top-right to avoid the starter mount bar.

The picture shows that it gives a little higher reading than then old sender, but it looks good. I show both what it looks like when driving and idling.
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twopass

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XR2Man

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Re: Will Mazda Miata Oil Pressure Sender Work?
« Reply #23 on: August 03, 2014, 05:50:23 PM »

Hi there guys!

    I joined the forum a few months ago. I purchased a 1991 XR2 with turbo engine and have spent some time getting to know the car and working on it cleaning it up and fixing some things. One of the things is the Oil Pressure sender unit. When I get to take the car out for a drive, the oil pressure gauge reads near the red line or sometimes it reads up about an 8th to a 1/4 higher. Then again sometimes it reads way up on the gauge. Doesn't matter if its driving it around town or on the highway. Still shows the same on the gauge. I have taken the braided ground cable off and cleaned the ends of the cable and the mounting spots and put the cable back on and no change. Now here is the fun part. I have worked for a truck dealership for International Harvester Co, which is now Navistar, in the truck division. Worked there for 43 years!!! Anyway, if you look at the oil pressure sender picture at Modern Capri parts, we sell a sender that looks EXACTLY like the one for the Capri!! The part# is 584051C2. I DO NOT know what the specs are for this sender. It is used on gas engines in trucks. It is still available and it is priced WAAAAAAAAY under $100!! Now! If I knew the specs on the one for the Capri and what poundage between low and high it is, I might be able to inquire with International specs dept and see what poundage theirs is. I worry about mine whenever I drive it. I also worry about the fact that the car has 118,000 miles on it and I don't think the timing belt has ever been changed yet. That is another adverture I have to look into.

P.S......I have seen the senders on Ebay for sale under the part# 584051C2
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Jolls

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Re: Will Mazda Miata Oil Pressure Sender Work?
« Reply #24 on: August 03, 2014, 07:45:25 PM »

XR2Man,

I have exactly the same issue with my XR2 over here in Oz and have been researching high and low to find an OEM replacement that will fit.

Sender rating - O to 700 kpa (7 Bar/100 psi)
0 kpa/bsr/psi) - 116.2 ohms
200 kpa/2 bar/30 psi - 49.5 ohms
400 kpa/4 basr/60 psi - 31.3 ohms
600 kpa/6 bar/90 psi - 17 ohms
700 kpa/7 bar/100 psi - 13 ohms (this has been extrapolated from the 90 psi and 120 psi readings for the gauge).

If you can't find the tech data they are easy to test if you are able to make a schrader valve (tyre) to oil pressure sender fitting. You measure the resistance between the output and the base . You can check the curve by applying X air pressure and reading off the resistance.

If it looks exactly the same as the one from the Capri it is probably a VDO sender unit (our OEM gauge and sender were VOD made specifically for the Capri - why???). My research indicates that VDO don't make a sender init in the same specification range. The closest is a 120 psi gauge that reads 100 ohms at 120 psi but is close at the low end. I would need to dig out the specs. I have found a wells unit that is bloody close but it is larger and I need to see if it fits behind the manifold bracket. Unfortunatley I didn't get to it over the weekend.

I trust this helps. If you can confirm the data I'm in for one of the sender units.

Cheers and Beers

Craig
« Last Edit: August 03, 2014, 08:01:39 PM by Jolls »
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capriBill

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    • 1992 XR2
Re: Will Mazda Miata Oil Pressure Sender Work?
« Reply #25 on: October 17, 2014, 12:08:55 AM »

The is still working well since June. I was told afterwards by Russ Carlson that the starter mount bar does not really need to be put back. It is just over engineering. If it is not put back, there is more than enough room for the larger Miata sending unit I used. It is a "Standard Motor Products PS261 Oil Pressure Sender".
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