QuestionYes, I did check the vacuum from the throttle body to the bottom of the EGR modulator. I had had a stalling problem quite a few years ago and this was clogged. So this was the first thing I checked. When I step on the gas, I put my finger on the bottom of the EGR valve and it moves right away.
Since this started after I noticed the oil dip stick was not in, could I have created this problem?
I also noticed there is water (Just moisture not buckets full)from the throttle body to the bottom of the EGR modulator. I was told this is normal?
Could this be problem be from the gas cap or charcoal canister being bad?
Could the cat converter also be the problem?
Still struggling.
Marcel.
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I replaced the EGR Modulator and engine light still comes on after resetting it. Sometimes it goes out but comes back on the next day.
Any suggestions?
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I have a 1993 toyota tercel with engine 3E-E (I believe that's it) The check engine light came on after I had forgot to put the Check oil dip stick back in. So far I have change the EGR temp sensor and all the vacume hoses.
My car runs really good but the light still come on after second trip (only after about 55-60 mph). Sometime the light goes out but when I check the code it shows 71. I have also cleaned the throttle body with carb cleaner(Safe for my car, so it say on the can) The egr ports are clean. The car stumbles when I press in the EGR. Ports are all clean. I was told it could be the EGR VSV (blue connector) I check its resistance and its good. With no voltage air does not pass. With voltage air passes through the posts. I was told even thought this check passes there is a chance it's bad? I also cleaned out the EGR modulator. Both were covered in oil from no dip stick. What could be the problem?
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Marcel,
First check for a vacuum source from the throttle body to the modulator.It should only have vacuum at part or open throttle. Next check the exhaust input on the bottom of the modulator. They tend to clog up with carbon. Next check for vacuum coming out of the modulator at part throttle before the vsv. If there is no vacuum there then you need a modulator. The hot exhaust gas tends to eat the diaphragm inside. Your VSV sounds fine, you tested it accurately.
Good Luck!!!
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Marcel,
Have you tested for vacuum from the throttle body? Also, check to see your exhaust input on the bottom of the modulator is not clogged with carbon.
AnswerMarcel,
If you can feel the valve physically open when you open the throttle then it is working normally. I think the next thing to check would be the main EGR tube between the exhaust manifold and the EGR valve for clogs. The tube should increase in temperature when the EGR valve opens. If it does not there is no gas flowing inside the tube.
