KOEO Code 51

[svono50]

Grrr, think I found part of my cold start problems that popped up in the past month or so. I just want to make sure I am understanding this code correctly. Per the Slocum book, this code is for "ECT sensor voltage too high". That would likely mean that there is an internal short in the ECT or internal short in the wiring for the ECT circuit, correct?

Of course my code scanner describes code 51 as voltage too high or and open circuit. I guess that could mean either a short or broken wire, ughh.

I was thinking of just unplugging my ECT connector, but a wiring short would not change anything, again correct?

Ah the joys of owning a 23 year old car...

[svono50]

Mike, I am very thankful I don't have an 84 with thier insulation shedding issues, but mine still has its own issues now and again.

Figured I would give an update. My scanner's description of an 'open' turned out to be correct. I probed the ECT sensor and came up with infinite resistance (i.e.- an open). This was a replacement ECT that I put in probably 5 or so years ago. My records don't even have anything listed, so I must have been having a bad day. The now blown ECT has an all plastic body, while the new one from Advance is like the original one with a brass/plastic body.

While I had things apart I probed the wiring harness portion between the firewall connector and ECT, all was good during a vigorous wiggle test so no issues there.

I put everything together and performed a quick KOEO scan, 11/11...there was hope. Cranked her over and fired right up and settled into a normal warm-up idle then down to a smoother low idle than I can remember for quite some time. I have a strange feeling the old ECT was going out for the past couple of seasons and finally gave up the ghost a couple of weeks ago when my cold start issues got real bad. May also explain some 'strange' full throttle runs on the Autobahn back in June too.

For once the EEC actually gave me a viable code that really did point to the culprit!

[NavySVO]

[Erics SVO]

For once the EEC actually gave me a viable code that really did point to the culprit!

Ya gotta love when it does WHAT it's actually supposed to do - Help you.

[svono50]

I figured I wouldn't leave the suspense open and actually post what fixed it.

I had also found that I melted my turbo inlet flex hose again, right were the homemade heat shield ended...surprise, surprise! Low temp flex hose combined with a track day is not good. My fix for that is some high temp silicone coated flex hose, which I just received from Pegasus Racing. Now my orange flex hose will match my orange intercooler coupling hoses...

[Pat_in_L.A.]

Now my orange flex hose will match my orange intercooler coupling hoses...

Using those International Harvester parts? I found other orange to use under the hood of one car to continue the orange theme. Wix cone air filter. Clamps from a Wix fuel filter for the BCS hoses. Evap cannister hose.

[svono50]

Using those International Harvester parts? I found other orange to use under the hood of one car to continue the orange theme. Wix cone air filter. Clamps from a Wix fuel filter for the BCS hoses. Evap cannister hose.

Ha! Good one Pat. Acutally I bought those hoses from Hahn Racecraft back-in-the-day, 1993 if my memory serves me right. They are pretty thin and have held up very, very well. One of the best $20 purchases I did for the car.

I tried some lovely green silicone hose couplings from a local diesel truck house, but they were too thick and would always squish out from under my hose clamps. Not a good thing considering I don't have any intercooler brackets to hold it in place, my hoses have to stay put. It is pretty amazing how much your hood jumps when your turbo to intercooler hose pops off, scared the snot out of me first time it happened.