Question about 1990 Toyota Supra

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NO POWER !!! 1990 supra

So i have a 1990 turbo supra and i was driving home and my subs cut out so i pulled over and turned off the car to check out my amp's wiring and when i went back to start the car i turned the key and there was nothing. I have checked the battery which is fully charged with good connections and all of the fuses in the fuse boxes are good. There is no alarm or starter interupt installed so i am stumped. Any Ideas

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I had an issue with the smaller wire off the positive battery terminal breaking inside the casing. Damn hard to find! I would suggest giving the wires around the battery a wiggle, and a feel. Could be a loose connection.

Posted on Jan 16, 2009

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I just replaced the turbo on my 1987 supra i drove it home from my shop and then the next day i was goin for a drive i started it up every thing was good i hit the gas when i started to build boost it...


do you have a service manual that troublshoots turbos--get car scanned and inspect entire vehicle for vacuum leaks or other problems of aging-itz 24 yrs--OBD I diagnostic n dont go replacin parts til u know

Aug 18, 2010 | 1987 Toyota Supra

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1988 supra non turbo. overheats, pressure builds u...


Check fan clutch does it have silicon,or replace silicon

May 21, 2010 | 1988 Toyota Supra

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Mk3 Supra Turbo Boost Gauge Problems


The gauge is working fine, the turbo will not kick in untill the engine is spinning fast enough, as the turbo is propelled by exaughst from the engine. So, you can drive around normal and never use the turbo, and climb in the gas and spool the turbo up, what you are noticing is called turbo lag, which is the biggest down fall when compaired to superchargers!

Feb 23, 2010 | Toyota Supra Cars & Trucks

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1987 supra turbo master cylinder troubleshooting


Jack up the car with adequet support have someone work the clutch in and out,obseve the slave cylinder when the clutch pedal is realeased--is it free or hanging up -still tight then problem with the master or slave.If not then the clutch plate may be stickly on the splines when cold,

Nov 09, 2009 | 1990 Toyota Supra

2 Answers

Acceleration hesitaiton, speedometer, overdrive light flashing


First off, I have a 1987 Supra non-turbo and I have seen a similar problem on my car. Probably one part of the two part speedo cable has broken, or the speed sensor has failed. The speedo cable turns a speed sensor which is part of the speedo gage cluster. The signal right now from the speed sensor to the computer is probably zero so the PCM thinks the car is stopped. The PCM has a limit on how high the engine will rev while the car is not moving. This is also the "limp home mode" max rpm in case the speed sensor fails. So if you fix your speedo/speed sensor, I think the acceleration problem will go away. The cable is in two parts--a "lower cable" which goes from the tranny to a junction and an "upper cable" which goes from the junction to the speedo. You will need to determine which cable is broken or if the speed sensor itself has a broken part.

To check the cable, find the junction under the car on the passengers side and disconnect it. The cable frequently breaks right at this spot. You will be able to turn the upper speedo cable by hand and have a partner listen/look for results on the speedo cluster. If the cable checks out, you may have to pull the instrument cluster to check what is wrong with the speed sensor.

Secondly, the flashing O/D light is signaling you that there is a trouble code waiting (probably for the transmission which also needs a speed signal). You can obtain trouble codes from the PCM via the diagnostic connector in the engine compartment. The connector is on the driver's side of the compartment just behind the fuse box. It is labeled "diagnostics". Using a paper clip or a hair pin and a jumper wire, connect the terminals "T" and "E1". (there is a guide to the terminals on the inside of the plastic flip cover.) Turn the ignition to on but do not start the car. The check engine light will start flashing two digit codes. (Four flashes followed by two flashes=Code 42= speed sensor signal lost.) There will be a pause then the next code. At the end of the codes, it will start repeating the sequence of codes again until you turn off the ignition. If there are no codes, the check engine light will just flash continously once every second. Don't forget to remove the diagnostic jumper before starting or driving the car.

May 20, 2009 | 1988 Toyota Supra

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Toyota Supra 1987, Will not rev up.


Is it a turbo? You may be having a fuel-cut issue. Has teh problem happened since? If this only happens once is a while, it will be hard to diagnose.

Apr 14, 2009 | 1987 Toyota Supra

2 Answers

Warning light on far left next to the temp gage comes on


This is knows as the "bird cage" by most MK3 owners. it's the coolant warning light. It means that either you don't have enough coolant in the system, or that your sensor has gone bad. I recently buoght my 2d MK3 Supra. Both have been 5 spd Turbo. This warning light is a simple fix. If you have any other questions about teh car please visit Supraforums.com They are very knowledgeable about any year Supra there. It's jut a community of Supra owners who will help each other out and give advice on repairing/upgrading. It will really help you learn a lot about your Supra.

Nov 19, 2008 | 1989 Toyota Supra

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