Recent content by masyam

It took me 3 times to pass California smog test after eliminating the code 25. It was failing at idle speed. Readjusting the TPS improved the numbers, but not good enough to pass the test. Replacing the VAF took care of the problem and it passed the test with very good numbers. I purchased a...

I'm glad it's been fixed.

I've already changed spark plugs, wires, distributor cap, distributor rotor, and pcv valve. I also installed o2 sensors, catalytic converters within the last 2 years. So I don't think any of these are the culprits. I went through exactly the same routine in the last 2 years on my 94. What I...

I found a problem that may have been throwing the error code 25. It was the O2 sensor heater voltage (HT2) that was not generated in the ECM. The HT2 voltage is around 14.2 V while engine is running and it's 12V with just the ignition ON. I was getting 12V with ignition ON and only 5V with...

Yes, this is where vacuum needs to be applied. It pulls the actuator away from the set screw. I have no idea what the function of this vacuum device is.

Hi, is the spot 1 in the photo where I apply vacuum？　Thanks.

Yes, I had a high idle before when I removed the accelerator cable and reinstalled it. I have since re-adjusted and it was fixed with a startup idle at around 1200. Like you mentioned the AC cable was too tight. I now have a low startup idle at around 950 after I replaced the throttle...

Can someone tell me if the UFO looking part below the throttle position sensor in the picture above is the throttle opener? Is this where a vacuum needs to be applied while adjusting throttle position sensor with a feeler gauge? Thanks in advance.

Have you found a cause of your problem or taken it to a dealership? I'm having the same code 25 problem and I've been working on it for a long time. Any information will be appreciated.

No, I could not get the VSV off without taking off the upper intake plenum.

I first had the error code 28 and the problem was a bad driver side O2 sensor. Its heater circuit was open. Even after I replaced it with an NTK purchased from Rock Auto, I was still getting the error code 28, but it was intermittent this time. I purchased more O2 sensors thinking there could...

I got rid of the error code 28 some time ago. I purchased a Toyota, NTK and Denso sensors and found that they are all made by NTK. They all seem to work fine.

I had a very similar rough idling problem and replaced the coolant temperature sensor. It's been a couple of weeks and I have not seen this problem so far. I first replaced with a non-Toyota sensor (~$10) and the engine kept stalling just once in the morning right after the first start up...

Unlike NTK parts, the Denso part had a Toyota stamp and part number on it as well as a NTK stamp. You can see them in attached pictures. A Rockauto sales suggested that I should use a Denso also. Although Denso O2 sensors for 94's are made by NTK (NGK), there may be some differences. I'm not...

Are you getting some error codes? I purchased a Denso sensor(234-4520) as well as NTK's(NTK24044 and NTK24080) and one from Toyota 89465-69125. Although the Denso sensor came in a Denso box, the sensor inside the box had the "NTK" stamp on it. I returned it but I believe it was the NTK24044...