North American Turbocoupe Organization



IVR
Arnold Booth Offline
Junior Member
#1
Fellas i think my IVR is going bad?...…….Gauges are erratic and a few times went to zero and then back however...…..does my 88 Turbo Coupe have an IVR and if so why can I not find a aftermarket/replacement for it?
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Jeff K Offline
Administrator
#2
The POS OEM thermal / mechanical IVR is a throwback to the 1960s. Check Ebay, Amazon, etc for a solid state replacement version. I built my own solid state adjustable IVRs for both my Tbirds for $5 each worth of parts.

Usually failing IVR causes the oil, temp and fuel gauges to go to max for a while and then return to normal, but I have seen them drop out too. If all 3 gauges do the same thing at the same time, by far the most likely cause is the IVR.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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Arnold Booth Offline
Junior Member
#3
(11-01-2019, 12:04 PM)Jeff K Wrote: The POS OEM thermal / mechanical IVR is a throwback to the 1960s. Check Ebay, Amazon, etc for a solid state replacement version.  I built my own solid state adjustable IVRs for both my Tbirds for $5 each worth of parts.

Usually failing IVR causes the oil, temp and fuel gauges to go to max for a while and then return to normal, but I have seen them drop out too. If all 3 gauges do the same thing at the same time, by far the most likely cause is the IVR.

Thanx Jeff ….can you be more specific as to what I should look for on E-bay on Amazon?.....88 Turbo Coupe replacement SS IVR?..And also is the IVR still on the back of the instrument cluster with the 9v battery type connector?..thanx again
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Jeff K Offline
Administrator
#4
Yup the thing with the 9 V battery connector is the IVR.

I remember seeing some solid state IVRs a year or 2 ago, but dont remember what I searched for, as I wasnt going to buy any anyway since I built my own.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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anasazi4st Offline
Senior Member
#5
(11-02-2019, 03:05 PM)Jeff K Wrote: Yup the thing with the 9 V battery connector is the IVR.

I remember seeing some solid state IVRs a year or 2 ago, but dont remember what I searched for, as I wasnt going to buy any anyway since I built my own.

Jeff:

Can you share with us the schematic and parts you used to build your own?

I replaced mine years ago with a new OEM one, but the gauges are starting to act finicky again—all three read higher with the head/fog lights and a/c on.
Another proud dues-paying member.

1987 Turbo Coupe w/T5OD, 8.8 axle, grey smoke; most options. Got it in 1991 with 41K miles: 3 turbos, 2 heater cores, 1 T5OD full rebuild, 5 clutches, 1 head gasket, 2 Teves II ABS units, etc. later....
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andrewjs18 Offline
Administrator
#6
(11-04-2019, 08:10 AM)anasazi4st Wrote:
(11-02-2019, 03:05 PM)Jeff K Wrote: Yup the thing with the 9 V battery connector is the IVR.

I remember seeing some solid state IVRs a year or 2 ago, but dont remember what I searched for, as I wasnt going to buy any anyway since I built my own.

Jeff:

Can you share with us the schematic and parts you used to build your own?

I replaced mine years ago with a new OEM one, but the gauges are starting to act finicky again—all three read higher with the head/fog lights and a/c on.

this might be it: https://turbotbird.com/thread-new-design...ivr--35804
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Jeff K Offline
Administrator
#7
Yup, Andrew, that is the article...... I forgot that I wrote that years ago!
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
Reply

anasazi4st Offline
Senior Member
#8
(11-04-2019, 12:46 PM)Jeff K Wrote: Yup, Andrew, that is the article...... I forgot that I wrote that years ago!
Nice! Thanks to both you and Andrew for that!
Another proud dues-paying member.

1987 Turbo Coupe w/T5OD, 8.8 axle, grey smoke; most options. Got it in 1991 with 41K miles: 3 turbos, 2 heater cores, 1 T5OD full rebuild, 5 clutches, 1 head gasket, 2 Teves II ABS units, etc. later....
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