I recently bought a 92 tercel for $300. It was running real bad with a miss and alot of raw fuel smoke. Got it home and traced the vac lines and found the map sensor unplugged. Pluggin that back in made the smoke and miss go away. Then I drove it for a couple days thinking it would start running better since it had set for more than a year, but it didnt. Looked on the net for answers. Checked the codes in the obd1 and found a tps code only. Tested the tps and it was bad. Got a new 1 for a 94 tercel because that is what motor had been put in the car from a junkyard. The new tps helped alot at higher rpm, but stil a very ruf idol and no power at low rpm with a load, and sometimes stalling with or without a load at idol. I have already adjusted the timing too. My question for a toyota wizz out there is how if any do you adjust the tps, and does the 92 computer match up with the 94 motor stuff?? found no other vac leaks, new plugs/wires/dist cap, new pcv, very little white smoke with no fluids disapearing. Automatic trans with a/c. I would be very greatful if anyone could help, please reply with answers or questions if I havent gave enough info on the problem. To me it seems like some kind of fuel delivery problem, I am new to the Toyota world tho so???????? I would also like to kow wher the egr valve is on this car and if that could also be a suspect
Last edited by jomersexual; 06-14-2010 at 11:21 AM.
To check TPS:
On 1991 and later models, insert a 0.024 in. (0.60 mm) thickness gauge between the throttle stop screw and lever.
Connect the probes of an ohmmeter to terminals IDL and E2 of the sensor.
Gradually turn the sensor clockwise until the ohmmeter deflects, then tighten the screws.
Insert the following thickness gauges between the throttle stop screw and lever, then check the continuity between terminals IDL and E2 of the sensor.
1991-1994 models-0.020 in. (0.50 mm) thickness gauge, continuity
1991-1994 models-0.028 in. (0.70 mm) thickness gauge, no continuity
To check TPS:
On 1991 and later models, insert a 0.024 in. (0.60 mm) thickness gauge between the throttle stop screw and lever.
Connect the probes of an ohmmeter to terminals IDL and E2 of the sensor.
Gradually turn the sensor clockwise until the ohmmeter deflects, then tighten the screws.
Insert the following thickness gauges between the throttle stop screw and lever, then check the continuity between terminals IDL and E2 of the sensor.
1991-1994 models-0.020 in. (0.50 mm) thickness gauge, continuity
1991-1994 models-0.028 in. (0.70 mm) thickness gauge, no continuity
which one of the 4 terminals are the IDL and E2? this is the first toyota I have ever owned or worked on for that matter and I have no manual on this car. Your directions are great tho.
To check TPS:
On 1991 and later models, insert a 0.024 in. (0.60 mm) thickness gauge between the throttle stop screw and lever.
Connect the probes of an ohmmeter to terminals IDL and E2 of the sensor.
Gradually turn the sensor clockwise until the ohmmeter deflects, then tighten the screws.
Insert the following thickness gauges between the throttle stop screw and lever, then check the continuity between terminals IDL and E2 of the sensor.
1991-1994 models-0.020 in. (0.50 mm) thickness gauge, continuity
1991-1994 models-0.028 in. (0.70 mm) thickness gauge, no continuity
Will the tps afect the idol?? where should the throtle stop be befor doing the tps settings? I adjusted the idol which some what helped the stalling issue, and the only reason I messed with it was because the lever was not even touching the stop screw before? Start from scratch???
Check my pic here: O2 Oxygen Sensor Test
follow that EGR pipe and you should find EGR valve.
I had a plugged EGR and stalling problem, it cleared right up after plug removed.
Hope this helps...
was the pipe clogged or the egr itself? what method did you use to clean either or? I have used break cleaner and pb blaster on GM egr valves before with good luck? Wouldnt Know how to test the fuel pressure regulator would you?
I have the HAYNES manual for 87-94 tercels. It was printed in '95 and is the blue cover version. Ebay and Amazon have the manuals for crazy cheap but they are the purple covers. I don't know if they are the same or not. The blue cover might just be for Canada, or might be a newer version, or might be an older version, I don't know. But this manual is just as good as any shop repair manual I have seen. If a monkey had this manual, he could fix anything on the tercel. Probably why I can keep my tercel on the road. lol.
Sorry for the hijack, back to your question. to check the regulator, use a fuel pressure gauge and hook it up to the inlet of your fuel rail. turn the key on, with terminals B+ and Fp bridged, pressure should be 38-44psi.
a) if pressure is high, check for a restrited fuel return line. If the line is clear, replace the regulator.
b) if pressure is low, pinch the fuel return line. If pressure goes up, replace the regulator. If pressure doesn't go up, then there is a restriction before the rail or the pump is weak.
That's right from the book
BillyBob
The Following User Says Thank You to WilliamRobert For This Useful Post:
I have the HAYNES manual for 87-94 tercels. It was printed in '95 and is the blue cover version. Ebay and Amazon have the manuals for crazy cheap but they are the purple covers. I don't know if they are the same or not. The blue cover might just be for Canada, or might be a newer version, or might be an older version, I don't know. But this manual is just as good as any shop repair manual I have seen. If a monkey had this manual, he could fix anything on the tercel. Probably why I can keep my tercel on the road. lol.
Sorry for the hijack, back to your question. to check the regulator, use a fuel pressure gauge and hook it up to the inlet of your fuel rail. turn the key on, with terminals B+ and Fp bridged, pressure should be 38-44psi.
a) if pressure is high, check for a restrited fuel return line. If the line is clear, replace the regulator.
b) if pressure is low, pinch the fuel return line. If pressure goes up, replace the regulator. If pressure doesn't go up, then there is a restriction before the rail or the pump is weak.
That's right from the book
BillyBob
Good deal BillyBob. That makes perfect sense and I am on the hunt for the blue cover book!
TPS from a 92 or 94 are the same. Still the 3EE so the ECU should have no problems with it. Tune up, dirty throttle body and EGR are common problem areas that will mess with your idle. I can only imagine that the plugs are fouled after the massive amounts of fuel being dumped in with the MAP hose disconnected.
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