Speedometer, High RPM/Speed whine, High HC's 88 N/A

[theWeezL]

Originally Posted by ravenmaster

Hi all first post.

I have a 1988 Toyota Supra N/A which I just bought recently. Love the car. But I am having a few problems.

1. Speedometer worked fine until i removed the whole panel and put it back on, now everything works....except the speedometer. (It is connected in the back with the green thing. Any suugs on the cuase?

2. While driving on the freeway the other night I was fine until I got up to about 90 MPH/ 4000 RPM then a loud whining(?) sound came from the car. I let my foot off the accelerator and noise stoped at about 85 MPH. As long as I maintain right there I am fine. What could this possibly be? (Does not happen at higher RPM at lower speeds.)

3. Took it to go get smog checked and passed on the other two categories but on HC's (Hydro Carbons) it failed just over the max. Now my understanding is that if the Cat is bad then you would fail all three. Any suggs on what I can do to bring this number down?

4. This isn't so much a problem as it is I am curious (and if i did do it it'll probably be awhile) Is it possible to Change out the regular, boring Dash display for the digital one? If so, documentation?

5. Last but not least I get an error 52 (Knock Sensor issue) and looked and sure enough the nock sensor is connected to the block but the wire isn't connected to anything. Where is the wore supposed to be connected to? (remember mechanically illeterate so detail would be nie but any answer is welcome :-) )

Thanks for any and all help given!
Chris

#1 - you most likey broke the tip of the cable while putting your gauges back in. Ive done it before. It means you will have to replace the cable. Its not all that hard, the worst part is getting the cable back through the firewall.

#2 - Thats a hard thing to pin down. its not RPM related so I would look into the drivetrain/suspension as opposed to the engine. My gearbox whines at higher speeds, but for me its any gear and is RMP related. you might have a bad 5th gear or ....man I dont know about that one more than what I said.

#3 - I would bet your getting a rich environment. Might try replacing the O2 sensor. Yes the cat being bad might give a different reading, but if you replace the cat it might compensate for the HC's a little better and allow you to at least pass smog. I have to admit though, Im not really much of a smog expert.

4 - Digital dashes were never made available to USDM...your not gonna find a LHD digital unit 'cause they never made em. Ive seen a writeup on converting one over...and believe me, if your not an EE and have a ton of time to spend making it work...just forget about it right now. You can make the stock gauges look very nice with custom faces, colored bulbs and other mods however, and all those are easily done.

#5 - Im afraid wiring isnt my strong suit, and Ive never actually looked at that side of my engine very closely...someone else will have to help you with that. Or you can look at the online TSRM found here: http://groundsky.co.nz/techinfo/TSRM/ and see if that helps.