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1992 3s-fe engine hesitation

11K views 13 replies 5 participants last post by  toycarina  
#1 ·
My car is a European 1992 Toyota Carina GLI 2,0 3s-fe engine my problem is I can't find a repair manual that's cover the 3 wire throttle position sensor my question is if all 3s-fe engine is a like and no different from car model Camry, Corolla, Carina.
The problem I have is a hesitation when acceleration no power the engine idles fine and run well cruising on the highway. My first thought is to diagnose the TPS sensor (3wire) and I have a sensor on the firewall with 2 wires and a vacuum hose to intake manifold possible MAP sensor but I can't find any information about a MAP sensor in my engine.
Brand new spark plugs and distributor looks clean and rotor also,
I now that Carina is similar to corona but I can't find anything usefull in Corona forum since Camry have the same engine code I thought I post here.
 
#2 ·
I believe the 3sfe is a universal engine. I don't think the TPS would be the reason for sluggish acceleration. How many miles on your car? Automatic or manual? You might want to check the EGR valve. Not sure if it was required abroad. Vacuum leaks also could be a problem.
 
#4 ·
Post pictures of any items in question. Also, if the item in question has a part number written on it, let us know what it is... Most of us on here are only familiar with the North American version of the engine, which is a bit different than the rest of the world engine.

-Charlie
 
#7 · (Edited)
I have testing ignition cable checked rotor and distributor and ignition coil all seams to be within spec. All sparks plug is white engine running lean on all cylinders.
Throttle position sensor also good This is what I think is a MAP Sensor
I have trying to testing the oxygen sensor but the wiring harness on a bad location so I tried to make some measurement from diagnostic socket. I connected the positive probe to VF1 and negative to E1, then I bridge the TE1 and E1 the results was a steady 0,2 volt reading but I am not sure I did the right connection.

E1 I now is ground VF1 andTE1 I don't now. I followed a camry manual for the 3s-FE engine.
I guess it is a possible vacuum leak but the idle is smooth and nice only problem engine missing in cruising speed
 
#8 ·
The Vf connection always outputs a voltage relative to the long-term fuel trim of the motor, in 5 voltage increments (0, 1.25, 3.5, 3.75 and 5). It sounds like your fuel trim is all the way at 0, but I can't remember if that's for 'lean' or 'rich'. Based on the white (not tan, right?) spark plugs, you are running lean all the time. Make sure there are no leaks on the vacuum line to the MAP sensor... and I'm not sure what else to check at the moment.

-Charlie
 
#9 ·
You are all right Charlie the fuel trim shows 0V that's is engine condition is rich, and ECM compensation is to go 10-20% leaner. But when I look at the sparks plug all of them shows the engine is in very lean condition the spark plugs is all white. I am not sure but I think the O2 sensor is bad because the fuel trim should be 5V and and ECM compensation should be go richer 11-20%. I check this once more this week.
 
#11 ·
No, no map sensor I got some vacuum sensor on the fire wall it is a 2 wire sensor with a vacuum hose from intake a don't now what this is and the purpose. I will check the AFM (vane type air flow sensor) and O2 in the morning I got the feeling the O2 sensor give the wrong command to the ECU the engine running lean and I guess the 02 sensor telling the ECU to compensate for rich condition, so the engine goes more leaner condition.
 
#12 ·
I have testing the 02 sensor and decided 02 sensor is not function properly, I have testing the sensor from diagnostic connector and all test show 0v no fluctuation and long term fuel trim show 0v also and that indicate for rich condition witch is not true the engine running lean so ECU is making the fuel air mixture even leaner.
What I thought was a MAP sensor could be a vacuum swirl sensor I am not sure what purpose the swirl sensor could have.
I also blow cigar smoke checking for vacuum leaks but the only leak I could see was from the EGR modulator and I think this is correct, you should be able to blow through the modulator with engine of and no vacuum.
I will order a new 02 sensor I will let you now if this is going to fix the problem.
 
#13 ·
A MAP sensor will have 3 wires going to it and a single vacuum line. There is also an AC idle-up solenoid on the firewall that has two wires going to it, along with 2 vacuum lines. The AC idle-up solenoid will only affect how the engine runs at idle while the AC compressor is on.

-Charlie