bongt Posted July 24, 2004 Share Posted July 24, 2004 I have a 2003 RX300, problem when starting specially when hot weather. I have seen some post regarding my problem and the majority is cleaning the Idle Control Value and/or throttle body. My question is how to you do the above cleaning, is this where you add chemical with your gas. Please HELP. Thanks. Quote Link to comment Share on other sites More sharing options...
Ferrell Posted July 24, 2004 Share Posted July 24, 2004 I have a 2003 RX300, problem when starting specially when hot weather. I have seen some post regarding my problem and the majority is cleaning the Idle Control Value and/or throttle body. My question is how to you do the above cleaning, is this where you add chemical with your gas. Please HELP. Thanks. my girlfriends 99 has this same problem..... im trying to figure out how to get to the iacv as well...... anyone have pics from a shop manual? Quote Link to comment Share on other sites More sharing options...
oldrx300 Posted August 17, 2004 Share Posted August 17, 2004 My Rx300 has exact same problem, so I got read the forum and took out the 2 air intake hoses and the IACV locates right under them. I took out the two screws and cleaned the inside with the throttle body cleaner. The problem went away, so here is the pictures I took (IACV is the black piece with the two screws, one of them has the yellow dot on it). Hope this help somebody in the future. 1 Quote Link to comment Share on other sites More sharing options...
GoldenStateSilverSport Posted July 7, 2006 Share Posted July 7, 2006 My Rx300 has exact same problem, so I got read the forum and took out the 2 air intake hoses and the IACV locates right under them. I took out the two screws and cleaned the inside with the throttle body cleaner. The problem went away, so here is the pictures I took (IACV is the black piece with the two screws, one of them has the yellow dot on it). Hope this help somebody in the future. Be careful not to strip the two screws when removing them. It is challenging to break the factory torque to loosen those screws so find a very tight fitting screwdriver that will do the job. I am in the middle of cleaning my IACV myself.. Quote Link to comment Share on other sites More sharing options...
SKperformance Posted July 7, 2006 Share Posted July 7, 2006 I am going to pin this for now so no one should ever have to ask about it. enjoy. Quote Link to comment Share on other sites More sharing options...
SAM-RX Posted November 16, 2006 Share Posted November 16, 2006 I have the same problem, it doesnt start right away and currently I am having low idle speeds. I am going to clean the IACV but if didnt solve the problem I think I will start diagnosing the fuel pump. Quote Link to comment Share on other sites More sharing options...
meijerbrantm Posted November 17, 2006 Share Posted November 17, 2006 my friend is in san jose and she is having problems with her es300. I'm thinking it's the IACV from what I can tell, but she is a girl and can't really do it on her own. Is there anyone who could help her out there? I was going to try to PM GoldenStateSilverSport, but pm's are disabled... Quote Link to comment Share on other sites More sharing options...
angt220 Posted December 4, 2006 Share Posted December 4, 2006 I have a 2003 RX300, problem when starting specially when hot weather. I have seen some post regarding my problem and the majority is cleaning the Idle Control Value and/or throttle body. My question is how to you do the above cleaning, is this where you add chemical with your gas. Please HELP. Thanks. Hey I think I am having the same problem with my 2000 RX300 :( Let me know if you get any helpful replies... Thanks! Quote Link to comment Share on other sites More sharing options...
JETPILOT Posted January 25, 2007 Share Posted January 25, 2007 I'm having same problem too. On cold start, idle speed is very low or won't run at all without pushing on the accelerator. After warm-up it is ok for the day. Will clean valve and see what happens. JetPilot Quote Link to comment Share on other sites More sharing options...
tjmc11 Posted April 19, 2007 Share Posted April 19, 2007 I'm having same problem too. On cold start, idle speed is very low or won't run at all without pushing on the accelerator. After warm-up it is ok for the day. Will clean valve and see what happens.JetPilot Clean the Valva and it should solve the problem. Take off the air filter box lid. Remove the air filter box along with the filter. Remove air hose which is attached to intake / throttle body. Remove th valve....note..the phillips head screws are easy to strip so make sure you have the proper size phillips head screw driver. Clean enitre valve thoroughly with throttle body / carb cleaner. Re-assemble, and this should help eliminate the problem. If not, check for fouled plugs, stretched line from accelerator to throttle control, or fouled coils. Quote Link to comment Share on other sites More sharing options...
madtaz Posted May 5, 2007 Share Posted May 5, 2007 I'm having same problem too. On cold start, idle speed is very low or won't run at all without pushing on the accelerator. After warm-up it is ok for the day. Will clean valve and see what happens.JetPilot Clean the Valva and it should solve the problem. Take off the air filter box lid. Remove the air filter box along with the filter. Remove air hose which is attached to intake / throttle body. Remove th valve....note..the phillips head screws are easy to strip so make sure you have the proper size phillips head screw driver. Clean enitre valve thoroughly with throttle body / carb cleaner. Re-assemble, and this should help eliminate the problem. If not, check for fouled plugs, stretched line from accelerator to throttle control, or fouled coils. Quote Link to comment Share on other sites More sharing options...
madtaz Posted May 5, 2007 Share Posted May 5, 2007 Cleaned my IACV on a ES300.....worked beautifully. Runs perfect now. Beats $200.00 for a new valve. Thanks for the tip. Quote Link to comment Share on other sites More sharing options...
miztoy Posted May 6, 2007 Share Posted May 6, 2007 We started out attempting to remove the valve in order to clean it...but of course ended up stripping the screws.What we found to work was that there is a little hole where you can actually spray the cleaner into & it works the same without having to remove everything. Our Lex is now working great. Quote Link to comment Share on other sites More sharing options...
dirtypwntang Posted May 12, 2007 Share Posted May 12, 2007 We started out attempting to remove the valve in order to clean it...but of course ended up stripping the screws.What we found to work was that there is a little hole where you can actually spray the cleaner into & it works the same without having to remove everything. Our Lex is now working great. That actually doesn't solve the problem. I did that, and it proved to be only a very very very partial job. There are several little "chambers" inside the IACV that require direct spraying and rubbing w/ Q-Tip or cloth. To be safe, I decided to just go ahead and do the full job. Once I opened it up, I noticed that there are other chambers that the spray-in-the-hole-method CAN'T reach. The problem will come back for you, as it will for everybody else. But in your case, it'll be a lot sooner. Quote Link to comment Share on other sites More sharing options...
jaru22 Posted May 29, 2007 Share Posted May 29, 2007 I have a 2003 RX300, problem when starting specially when hot weather. I have seen some post regarding my problem and the majority is cleaning the Idle Control Value and/or throttle body. My question is how to you do the above cleaning, is this where you add chemical with your gas. Please HELP. Thanks. My 99 RX300 just started having a starting problem. I thought it would be the"starter" but after seeing this post I am wondering if this could be it? My question is: What would be my signal that this is the problem. My car just clicks when I try to start. It does not do it allthe time and after reading this, it actually might just be when it is warm outside. If it was this problem would I hear the engine trying harder to start or would it just be this clicking noise? Thanks! Quote Link to comment Share on other sites More sharing options...
2000guy Posted June 2, 2007 Share Posted June 2, 2007 I have a 2003 RX300, problem when starting specially when hot weather. I have seen some post regarding my problem and the majority is cleaning the Idle Control Value and/or throttle body. My question is how to you do the above cleaning, is this where you add chemical with your gas. Please HELP. Thanks. My 99 RX300 just started having a starting problem. I thought it would be the"starter" but after seeing this post I am wondering if this could be it? My question is: What would be my signal that this is the problem. My car just clicks when I try to start. It does not do it allthe time and after reading this, it actually might just be when it is warm outside. If it was this problem would I hear the engine trying harder to start or would it just be this clicking noise? Thanks! Hello, I have a 2000 RX300 and it too just started the clicking at start. Sometimes it doesn't do it. I bought a new battery because it still had original, but this didn't stop the prob. Has anyone else had similar issues? It almost sounds like a dieing battery or solenoid, but then cranks right uo sometimes too. Thanks for any help out there. Quote Link to comment Share on other sites More sharing options...
2000guy Posted June 4, 2007 Share Posted June 4, 2007 I have a 2003 RX300, problem when starting specially when hot weather. I have seen some post regarding my problem and the majority is cleaning the Idle Control Value and/or throttle body. My question is how to you do the above cleaning, is this where you add chemical with your gas. Please HELP. Thanks. My 99 RX300 just started having a starting problem. I thought it would be the"starter" but after seeing this post I am wondering if this could be it? My question is: What would be my signal that this is the problem. My car just clicks when I try to start. It does not do it allthe time and after reading this, it actually might just be when it is warm outside. If it was this problem would I hear the engine trying harder to start or would it just be this clicking noise? Thanks! Hello, My 2000 RX is 2wd and I'm having the same starting issues as you. Any luck yet? Thanks Quote Link to comment Share on other sites More sharing options...
chucksfc Posted June 6, 2007 Share Posted June 6, 2007 My Rx300 has exact same problem, so I got read the forum and took out the 2 air intake hoses and the IACV locates right under them. I took out the two screws and cleaned the inside with the throttle body cleaner. The problem went away, so here is the pictures I took (IACV is the black piece with the two screws, one of them has the yellow dot on it).Hope this help somebody in the future. Had the same problem, followed your procedure and it has worked great since. Thanks for the tip! Just an obvious warning - I hosed out the throttle body itself as well (it was pretty grimy) with a lot of cleaner. When I reassembled and went to start the car, it hydrolocked. I waited about a half hour and I guess the remaining throttle body cleaner evaporated. Another obvious warning (apparently I am an idiot)- Be careful when hosing out the solenoid and throttle body as the vapors and cleaner get redirected basically into your face through the throttle body itself. That is some nasty stuff. Quote Link to comment Share on other sites More sharing options...
chucksfc Posted June 6, 2007 Share Posted June 6, 2007 don't know how to delete a post. Quote Link to comment Share on other sites More sharing options...
Ken Littleton Posted June 25, 2007 Share Posted June 25, 2007 My '99 RX300 started having the warm-start-won't-idle problem shortly after running a tank with STP fuel system cleaner because my gas mileage dropped from 18mpg(city) to 14mpg. Local Lexus dealer wanted over $600 to fix. It took me about two hours to remove, clean and reinstall the Idle Air Control Valve and throttle body. http://us.lexusownersclub.com/forums/index...c=30723&hl= (Big Thanks to GoldenStateSilverSport) The idle problem seems to be fixed now and hopefully my mileage will increase. :D Quote Link to comment Share on other sites More sharing options...
lenore Posted June 25, 2007 Share Posted June 25, 2007 Hey good job and you saved yourself some big bucks, how does it feel to work for $300 per hour.... Quote Link to comment Share on other sites More sharing options...
Mr Rx Posted August 3, 2007 Share Posted August 3, 2007 Thank's. I had the same problem with the (ICV) on my rx 300. Now the problem is gone! Quote Link to comment Share on other sites More sharing options...
AUSRX Posted August 13, 2007 Share Posted August 13, 2007 We started out attempting to remove the valve in order to clean it...but of course ended up stripping the screws.What we found to work was that there is a little hole where you can actually spray the cleaner into & it works the same without having to remove everything. Our Lex is now working great. That actually doesn't solve the problem. I did that, and it proved to be only a very very very partial job. There are several little "chambers" inside the IACV that require direct spraying and rubbing w/ Q-Tip or cloth. To be safe, I decided to just go ahead and do the full job. Once I opened it up, I noticed that there are other chambers that the spray-in-the-hole-method CAN'T reach. The problem will come back for you, as it will for everybody else. But in your case, it'll be a lot sooner. The thing I found that had the biggest impact on the slow/rough idle problem was the small wave/spring washer in the electric motor of the Idle Air control Valve (IACV). I had tried all of the cleaning and maintenance actions detailed above and found that it made some improvement but did not fully correct the problem. Then I remembered reading something in an earlier forum stating the engine would not idle at all and stall because the wave/spring washer was left out when the valve was reassembled. So I removed the solenoid/DC Motor component of the IACV and took out the wave washer and slightly increased the amount of bend on the washer (don't overdo it) and therefore putting more tension on the mechanical gate of the valve, therefore providing a dampening effect. I placed the washer back in the housing and re-installed the solenoid assembly and found that it was a little spring loaded when I tensioned the 2 securing screws. The engine now idles correctly and the slow/rough idle problem has been remedied, for now anyway. I will continue to monitor it and post it if the problem returns. All the info I have been able to use from this forum was excellent and I am very thankfull to everyone that has contributed and I hope this little note will also help someone out else out there. Cheers Quote Link to comment Share on other sites More sharing options...
boldwin Posted September 18, 2007 Share Posted September 18, 2007 I have a 2003 RX300, problem when starting specially when hot weather. I have seen some post regarding my problem and the majority is cleaning the Idle Control Value and/or throttle body. My question is how to you do the above cleaning, is this where you add chemical with your gas. Please HELP. Thanks. You can fix this obnoxious problem yourself, but you'll probably need a repair manual to know what must be done, i.e diagnostic and repair procedure. Quote Link to comment Share on other sites More sharing options...
Dave_02RX300 Posted November 20, 2007 Share Posted November 20, 2007 My 2002 RX300 seems to have this problem: yesterday while starting it when it was warm, it would not stay at idle speed and died. I had to rev it to keep it started. Then it ran OK. It happened again from cold start today, and happened again from warm start today - it can't remain at idle after start. It's going to the dealer - still under CPO warranty. Thanks for the info on this thread -Dave Quote Link to comment Share on other sites More sharing options...
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