Nau Posted February 17, 2005 Posted February 17, 2005 A week ago check engine lighted up on my '90 ES250. It was on for two days, then turned off by itself. Code showed was 71 - EGR, right? (Sorry. I don't have a manual :(( ) I tried to suck on the tube which goes into valve, it opens/closes just fine, the hoses which I can see from the top look good. I get also quite a lousy mileage - 17-18 city MPG and 23 highway. Tune-up 2K ago. What should I look into? Thanks!
mehullica Posted February 18, 2005 Posted February 18, 2005 With the engine running, apply vacuum to the EGR valve. The engine should stall. If not check the passage and clean it. Next check the amount of vacuum coming from the vacuum modualtor into the EGR valve. Should be about 11-14 inches of vacuum @ 2200rpm's. If not replace the modulator.
cruznroadking Posted February 18, 2005 Posted February 18, 2005 Also check the tube connected to the egr valve. Sometimes it plugs up with carbon deposits which can get pretty thick thus restricting vacuum the the egr valve. The carbon needs to be throughly cleaned out otherwise the check engine light will continue to come on & off.
Nau Posted February 18, 2005 Author Posted February 18, 2005 Also check the tube connected to the egr valve. Sometimes it plugs up with carbon deposits which can get pretty thick thus restricting vacuum the the egr valve. The carbon needs to be throughly cleaned out otherwise the check engine light will continue to come on & off. ← Thanks for your advice guys! I'll do that. Also I forgot to metion that idle RPM behaves strange: Say I stop at traffic light, idle can be at 1200, and go down to 700-800 in 1-2 mins. Or it can go right down to 700-800. Is it related to EGR problems? Car has 158K on it... Thanks again!
mburnickas Posted February 18, 2005 Posted February 18, 2005 Also check the tube connected to the egr valve. Sometimes it plugs up with carbon deposits which can get pretty thick thus restricting vacuum the the egr valve. The carbon needs to be throughly cleaned out otherwise the check engine light will continue to come on & off. ← Thanks for your advice guys! I'll do that. Also I forgot to metion that idle RPM behaves strange: Say I stop at traffic light, idle can be at 1200, and go down to 700-800 in 1-2 mins. Or it can go right down to 700-800. Is it related to EGR problems? Car has 158K on it... Thanks again! ← My EGR went last year at 72K miles. Did the weird ideling and stalling.
Nau Posted February 19, 2005 Author Posted February 19, 2005 My EGR went last year at 72K miles. Did the weird ideling and stalling. ← So what was wrong?
melhadri Posted February 19, 2005 Posted February 19, 2005 I have a 1998 Lexus ES300 w/ 85k miles. I just went to the Lexus Dealer today and they determined that my EGR valve is malfuctioning.($400) Take a look at my post: http://us.lexusownersclub.com/forums/index...showtopic=17088
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