92 adjusting distributor to line rotor with #1 wire on cap. ?

[Toysrme]

Oh wierd, last time I rebuilt mine, it did the exact same thing. It was because the throttle cable was pulling the throttle plate open 1/16" of an inch from closed.

[Techventure]

Originally Posted by Toysrme

Oh wierd, last time I rebuilt mine, it did the exact same thing. It was because the throttle cable was pulling the throttle plate open 1/16" of an inch from closed.

I tried to adjust the throttle cable to see if my throttle plate was the same as yours. I couldn't adjust it. I took the EGR valve off and cleaned it....actually it was very clean.

Is there some other way to adjust the throttle cable ?

Brian suggested checking the ECT sensor and it's circuit. I'm not sure what what ECT means...I think it stands for Engine Control Throttle ???
Seems like a silly question !!! Couldn't find reference to it in my literature.

Any help with this will be appreciated. When I fire up the revs are at 2000...very high......it sits there for a minute and then occilated down to around 700 and back up to 2200.

[Brian R.]

Engine Coolant Temperature

[Toysrme]

Farthest I've seen one run on the coolant temp sensor is like 1500rpm by someone tuning their engine with a pot. That's a good thing to chekc tho.

Pull your throttle cable completely off, then start it & see how it idles.

[Brian R.]

In winter when they've sat all night, engines will idle at 2000 or around there initially.

[Techventure]

Originally Posted by Brian R.

In winter when they've sat all night, engines will idle at 2000 or around there initially.

I drove my wife in this morning and drove back...total round trip would be 10 miles and everytime I slowed, the revs would go up to 2500 and back down to around 900 continuously. When braking they would settle back to around a 1000 with my foot on the brake. Accelerating, the cycle would stop. When I slowed and stopped.... sitting in park or neutral the engine continued to go up and down on a 1-2 second cycle.

In our part of the country cold temps. are normal this time of the year and sitting at a start-up rev. rate of 2000 is not unusual and this has been normal for the car since I purchased it in 1997. Something has happened since I did all the work to it. In addition to timing belt, dist. cap & rotor, new plugs and wires, I cleaned the throttle plate, EGR valve and IAC. This cycling has started since all this was done.

What would be the affect if I removed one at a time out of the system.... the EGR valve ? I've read where the EGR valve sticks...would this cause the engine to accel. and deaccel. on a rapid basis ? the ECT sensor ? The ECU would lack signals from the ECT sensor....how does the engine react to this ? I'm thinking of ways to isolate the cause and then rectify.
My experience is limited...it's a learning process for me !

Any assistance is certainly welcomed and is greatly appreciated.
Thanks.

Murray

[Techventure]

Originally Posted by Toysrme

Farthest I've seen one run on the coolant temp sensor is like 1500rpm by someone tuning their engine with a pot. That's a good thing to chekc tho.

Pull your throttle cable completely off, then start it & see how it idles.

I'll give it a go in the moning.
Thanks

[Brian R.]

The ECT sensor may give false readings that are time-dependent. Although your symptoms are weird, there is no way of knowing until you test the sensor. Pull the connector from the sensor and see what voltage is output. If it's a stable voltage, then the ECT is not the problem. The TPS (throttle position sensor) may also send bad data to the ECM.

[Techventure]

Originally Posted by Brian R.

You're welcome. For the high idle, check your ECT sensor and it's circuit.

I went out to remove throttle cable as Toysrme suggested and test the ECT voltage as Brian advised, before I did this I put a diagnostic on the Check Engine and it was flashing Code 1....no problems. I started up and the engine revved fine. I took it out on our street and everything was fine..... idled at 2000 ...not surprising with our temperature -6 C. So at this time it appears to have corrected itself. I have no idea how !

On the drive my ABS light clicked on and I had a right rear wheel lock up. Removed the tire and rotor after much difficulty and found the emergengy must have locked on and not come off at some point....didn't realize. The brake shoe material cracked off.....thickness about 1 mm.
I hate to admit....but I didn't realize the emergency was tied into a brake shoe system.

One never stops learning and I'm into 6 decades ! It's still great and a good feeling when you get the job done, specifically when I had one of my sons keep telling me just to take it into the repair shop! I can see his side.....I've been working in half my garage open to the weather since this repair popped it's head up due to starting the renovation of the garage into a den.

Now posted in classifieds for a good Toyota OEM parts source in Ontario for brakes.

Thanks to everyone for their kind input.It is much appreciated. This is a very commendable site.

[Brian R.]

You're welcome. I hope it stays gone.