 Help: Check engine light on, code 71 |
 Dec 19, 2012 - 7:50 PM
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Enthusiast Joined Dec 19, '12 From California Currently Offline Reputation: 0 (0%)  |
Hi, I have a '94 Celica ST automatic, with about 170,000 miles. The check engine light is on and it's code 71. I already cleaned out the EGR, but the check engine light came back on after I reset it. So I got another EGR used from Pick a Part, and the light is back on again. Could it just be it needs a new sensor?
Also, smoke comes out of the tail pipe when I give it gas, and it smells really bad. Is it unrelated to the check engine light being on? I've considered having the engine rebuilt, but I want to make sure before I spend that much money. It has good compression. I bought valve seals but the person who was going to do them said it would be best to just rebuild the engine. And the person I bought the car from said he recently rebuilt the engine. So I just don't know.. I'd appreciate any ideas on these problems. Thank you! |
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Replies
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Dec 19, 2012 - 8:56 PM
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 Enthusiast  Joined Feb 23, '12 From Warrior, AL Currently Offline Reputation: 0 (0%) |
There're 4 components within the EGR system, at least in OBDI. The valve, the modulator, the solenoid, and the sensor. All need to be tested in order to find what's causing the code. The code is triggered when the computer senses that the exhaust temperature is too low. Usually the sensor can be cleaned. Also over time the EGR tube and the ports get caked with carbon. Sometimes all it takes is removing the EGR tube and cleaning it along with the ports on the intake and side of the motor. The tube between the bottom of the modulator and the EGR tube is really susceptible to clogging. Recently had to clean mine out the other day. Google "7A-FE EGR Test" and you'll find out how to test everything.
-------------------- 2001 Miata LS 5-speed
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Posts in this topic
Jules88 Help: Check engine light on, code 71 Dec 19, 2012 - 7:50 PM
Box Also on the other issue. Is the smoke blue or bla... Dec 19, 2012 - 9:04 PM
Jules88 Thanks for the advice. The smoke is gray, and ther... Dec 31, 2012 - 4:29 PM Box You can give it a shot. Personally I wouldn't... Dec 31, 2012 - 7:06 PM Jules88 Alright I'm going to try that tomorrow, thanks... Jan 12, 2013 - 10:34 PM stephen_lee apply vac to the port on the egr valve(either with... Jan 12, 2013 - 11:31 PM BonzaiCelica Ok so since this is the most recent check engine c... Jul 12, 2013 - 4:51 PM richee3 There should be a TC pin in your diagnostic box. T... Jul 12, 2013 - 5:05 PM BonzaiCelica Thx but i failed before i even posted here. I conn... Jul 14, 2013 - 2:15 AM |
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