Is300 idle rpm Idle to 2500rpm feels weak, stumbles, poor response. How can i fix this. It didnt. The most common cause of a rough idle is misfiring. Didn't really notice when it started but since then I have cleaned my MAF Sensor and Throttle Body. 2004 IS300 Sport Design @ 154k miles I've replaced: Water Pump Cam Seals Valve Cover Gaskets Harmonic Balancer Plugs PCV Valve Hoses After finally putting the car back together I've noticed my RPMs drop Sep 23, 2006 · Any time actual speed varies by greater than 20 rpm from target idle speed, the ECU will adjust the ISC valve position to bring idle speed back on target. (car shakes) I need a battery as mine doesn’t hold too well, but i’m not sure that’s the cause of the issue. Normal to idle at 1000 RPM while stopped in drive? I’ve noticed the car will idle high with noticeable vibrations when cold and in normal/sport mode. It can't take that long for the engine to warm up!? I recently bought an 01 is300 that would not start. 75 srt turbo-megan coils, rotora bbk, volk le-37's,custom tinted tails, black pearl badging, lots of other stuffs. If a coil pack goes bad, it’ll cause a misfire and rough idle condition. are these numbers right or should it be near 1000rpm in park. MSM IS300-intake, chrome shortie antenna, painted Feb 16, 2012 · Once in a while my RPM seems low when the vehicle warms up and you put it in park and let it idle or even when you pull up to a traffic signal and hold it in drive, it feels like its just below that sweet spot and the car/engine sends slight vibration as if its going to stall. So How to Reset Lexus Idle | Lexus RPM Reset | Lexus IS250 Idle Reset THANKS MATE 2. Apr 1, 2024 · Here we go againreplacing one thing, fix another, then a multitude of issues pop up. Got codes p0300/p0301 Also had a hesitation around the 2k rpm Sep 12, 2025 · is300 misfire at idle but not at high rpm Jump to Latest 222 views 4 replies 2 participants last post by Austezza2J 6d ago P Sep 15, 2008 · SUMMARY Symptoms: Gradually increasing car hesitation, power loss, sluggish acceleration, lowered fuel economy. Shown in the attached vid, seems as if the throttle activates all the way then cuts at 3k rpm, drops, then revs back up continuously as it “idles” For a background on the recent work I’ve done, I was originally diagnosing a misfire. Oct 20, 2013 · 700±50 rpm/750±50 (w/AC on) is spec for in park at idle. Now, when I put some acceleration while the car is in neutral the engine doesn’t shake. When I rev the engine, it hesitates up until 2k rpm and then it drives Lexus ES300 with very low idle after disconnecting the battery. This old Lexus was in for a routine oil change but it started funny afterwards and idled very low. Clean your idle air control valve to fix it This video only applies to vehicles with drive by So I'm having a problem . The car when under a lot of load, seems to limit itself at 3k rpms. Thanks for the help I ordered a OEM Denso Toyota MAF sensor hoping it would fix the issue. When starting from a dead stop, I found that it was a bit harder to Aug 18, 2018 · Alright. The entire throttle is electronically controlled, and idle speed controlled through the ETCS. When the a/c is on it gets worse. Aug 16, 2015 · I've been getting super high idle on my is300. . May 10, 2025 · Hey y’all, I’ve been having issues for a while with my 217k mile automatic 2001 lexus is300. May 30, 2018 · I've been chasing a leaning out issue on my car and I'm starting to think it has something to do with the alternator not putting out enough power at idle because it seems to be only an issue at idle or low RPM. It also throw throttle control motor code. 1K subscribers Subscribed Sep 26, 2012 · I have an 2004 IS300 5 Speed with about 260k miles. One new thing I have learned is that the car only misfires in low rpms/lower gears, preferably between 1k to 3k rpms. These symptoms can indicate a variety of issues, from minor maintenance needs to serious mechanical problems. Shop OEM Lexus Idle Control Valves at wholesale prices. Jun 12, 2010 · A 2002 stock IS300 should idle in park around what rpm when it has warmed up? right now in park mine idles at 750 rpm and in drive with my foot on the brake it idles at 500rpm about. However in my '02 IS300 the idle, when cold, is significantly higher than it was when the car was relatively new. The cold Oct 10, 2025 · A few factors that could impact the optimal idle speed for your car include its age, type of transmission (automatic vs manual), altitude/temperature, and whether any modifications have been made to the engine. Jul 10, 2011 · So, my idle speed usually stayed around 700 rpm's till today. Lexus IS300 Engine idle speed is high Inspection costs starting from $95. No vacuum leaks, doesn’t burn/leak oil I did replace the MAF, I resoldered apps, I did try to “tune” the tps but when i cut the car off and back running it just went back to higher rpm. While at a stop, idling, I feel the engine kinda stutter. +rep for any feedback fellows Here is a quick guide on how to fix a Toyota or Lexus that either idles high or stalls on start up. Car runs, drives, and boosts great. My idle rpm's been all over the place lately. Every time I start the vehicle, when idling it feels like it wants to die. Revs and has power perfectly fine after then but from idle, it won't accelerate correctly until past then . So 2 weeks ago I did my oil change tranny fuel filter and LSD. I've potentially got a couple low compressions in 1 or maybe 2 of the cylinders. It ran fine for a couple days then it started acting up again. The car cold starts, and runs fine until about 1500 or 1200rpm down then it starts rough idling. I Nov 13, 2018 · Another issueis it normal for these vehicles to idle high? Even after a 5 minute drive the idle is above 1000 rpm and if I take my foot off the brake it moves forward too quickly. sometimes it would idle fine for a while before it got into fits. It only happens when in low RPM, both ways of feathering the throttle or stepping on it hard from the way i Jan 31, 2023 · In this article, we'll take a closer look at what causes high idle RPMs and what you can do to fix the problem if it's not normal. Started the car to check if I fixed it and got a May 22, 2014 · So i've been attacking a misfire issue for a while now. (2001 IS300-336xxxkm) I changed the spark plugs (no idea when they were last done, at least 80k kms)and cleaned out the TB (was VERY dirty) Now, when I start it cold it idles very high (1800-2000rpm) until it warms up (drops to 900-1200) as well as when driving it almost feels like there is still throttle being applied when theres no throttle input High idle RPM is often caused by vacuum leaks, faulty sensors, or throttle issues. Last week, after I took off the throttle body to install my spark plugs, my cold idle spiked up to 1800 rpm and settled around 1200 rpm when hot, with or Feb 22, 2005 · i know the tec3 can control idle, but i'm pretty sure with our pfs standard setup, the is300 ecu still controls. @This_is_KerpalIS300: P0505 CEL; Rough Idle; Low RPM @ idle Feb 19, 2011 · The IS300 should idle at 750 +/-50 RPM. May 6, 2025 · A smooth-running engine is the foundation of a well-maintained vehicle. my RPM's at idle would be 1100. I can share a pic of the map. Rough Idle Help My car feels rough at idle and used to have misfire codes, misfire codes now read pending with no CEL. I have to check for codes again but the only code I got at all was a 6th cylinder misfire and there was a bit of oil on the Idle speed: 700 50 rpm If the idle speed is not as specified, check the throttle body. Previously had 550cc RC injectors and went to 1000cc Deatschwerks. com. Your IS 300 will be running rougher at any RPM, but a misfire will be most pronounced at idle. - I have done a Boost & smoke test - no vacuum Very specific device for fitting Toyota engines with stock ECU to the IS300 Features: 1) Controls ECU modes: ECT Power/Snow, A/C idle-up, ELS (raise idle RPM for high electric load condition) 2) Converts RPM signal for analogue instrument panel per pre-defined settings: 6 to 4, 8 to 6, etc All Sales are Final. First I realize that a car should idle higher when cold so that the fuel burns properly. Jan 27, 2023 · They are fired by the PCM (powertrain control module) at precisely the right time to provide the optimal ignition timing. That way you're still within the target idle speed and see if that helps. In general, however, most cars should idle between 600 and 1,000 rpm while stopped, depending on the make and model. Before, it would idle around the 600 neutral and a 750 with AC. Pretty normal or should I be concerned? Apr 24, 2015 · The idle vibration is greater in the cold start mornings after the rpms drop down. I fixed my cel that was being thrown by the o2 sensor by taping into another heater signal and now my engine idles at 300-350 rpm Oct 8, 2012 · I've got a IS300 5 speed manual. Symptoms of a throttle relearn issue include rough idle, stalling, hesitation on acceleration, surging, and a check engine light. After i drive it hard and really get on it, it seems to smoothen out at idle. I have seen mine throw the misfire code when that happened. ” Assuming that is correct, is the reason that you guys are able to successfully correct the idle because the amount of air you are introducing exceeds the ability of the ISCV to correct? My is350 had bad idle with cold engine and weather for a few minutes, rough idle went away after a few minutes, the problem was that the throttle body was dirty, cleaning it fixed it. i've tried messin with the idle but the stock is300 ecu ultimatley controls it. pic 1 is in “drive” at idle pic 2 is in “neutral” at idle pic 3 is the few lines i’ve changed and yes I have Feb 28, 2023 · If you own a Lexus IS 300 and it’s idling rough, you may be feeling frustrated. This idle relearn procedure works on Toyota and Lexus, with the 1MZ engine experiencing low i. Under light/moderate load, I'm about 25-30°. Its been on and off for years now but worse since I replaced the fuel injectors 2-3 weeks ago. Learn 12 common causes and how to fix them yourself. It reads 12V when Toyota/ Lexus idle relearn/reset procedures after battery replacement and throttle body cleaning/replacement*Step 1: Start the engine and bring the car to an Jan 17, 2004 · This is the first cold weather since I had my IS and also since I had my grounding kit installed. May 7, 2024 · 2002 Is300 Na-t. Under full load, timing sinks down to 15-16° by 4500rpm, then increases to 16-18° by 6500rpm. It only happens when in low RPM, both ways of feathering the throttle or stepping on it hard from the way i Nov 23, 2008 · Why not try to raise idle a bit with the set screw? Try to get it a tad over 600 RPM while in drive, it's going to be a 2 person job. Please tell me this isn't normal. While in park it can go as high as 3k RPM, While in drive it sits a little under 2k Mar 16, 2018 · My IS300 runs really strong above 2500 rpm. By understanding idle RPM specifications, the importance of engine idling speed, and how to adjust and control idle speed, you can ensure optimal vehicle performance and longevity. Mar 31, 2007 · Hey, about a month ago, i started experiencing a high idle. Got the car running great and then decided to upgrade the injectors because I was maxing them out at 12 psi. So as I understand it, a vacuum Jul 29, 2008 · I'm going to do this via the airflow meter thing with the 2 adjustment screws. Obligatory "I'm new to this forum, the IS platform, imports in general, etc etc aside, I just picked up a 2002 IS300 5spd a couple weeks ago and it has a constant, steady, shake at idle. If the Op's pic is in park, then it is lower than it should be. Driving long term fuel trims are right at 0, short term is +- 2%. When your car starts to shake and shudder at a stoplight or maintains high RPM while stationary, it’s more than just an annoyance, it’s a warning sign. The parts and labor required for this service are Nov 6, 2009 · Hello braintrust. What are some possible causes of the OBDII code P0505 in a Lexus? Dec 17, 2022 · Howdy, 2001 IS300 auto, turbo'd and running a Haltech Platinum Sprint 500. The issue initially happened mostly at idle under load (in drive) where it would misfire every few seconds. Mar 4, 2024 · 7. It was transposed from the map on the old Haltech that ran my car for years and years. “When it comes to figuring out what proper rpm range is best for Mar 20, 2011 · 2001 IS300 E-Shift, Yellow -ebay T04E Turbo Kit @ 7psi -ebay FMIC -AEM FIC -MSR #103, 17x7 Silver Wheels -Lowered 2" on KYB Silver Struts -Full C-West Bodykit -Carbon Creations "SuperSport" Hood Aug 18, 2024 · The procedure allows the engine control module (ECM) to recalibrate the idle speed and throttle response. I've got an optima red top battery that should be perfectly fine. numbers based on FSM. Before tearing the top end down (spark plugs, wires, and ignition coils), What else should I inspect that can cause the issue above? Edit: No misfire in idle Frequently Asked Questions about P0505 Lexus Code 1. On startup it's idling at 1500 RPM and slows to about 1000 till the engine warms up. Conclusion: Maintaining the correct idle RPM is crucial for smooth engine operation, fuel efficiency, and emissions compliance. I wonder if anyone can shed some light on my idle issue. I generally idle around 600-700rpm without AC @ neutral but with AC I only do about 800 rpm. Is this normal on a stock engine? May 7, 2025 · IS300 Gurus needed, Throttle body and idle prob that refuses to correct itself Jump to Latest 908 views 31 replies 9 participants last post by TobiasSing May 18, 2025 L Oct 6, 2013 · Ok, having a bit of an issue with my IS now. Oil was the real thing I set out to do but hey might as well get it all done Higher than normal idle can anyone help? 01 is300- all the typical maintenance done. When the car is in idle it has a rough shake. 2. Panicwire harness and G4x Ecu 2jzgte aristo Intake manifold aps+tps Deatschwerks 700cc injectors Bosch VAG-short coils After about 5-6mins when it's trying to idle at target "950," it surges below and above target then it stalls. Let’s look at the most common causes of rough idling or trueNoticed that my car idles a little low, anywhere from 300-500 while in drive and about 670 while in park. Does anyone else’s car do this? 2018 IS300 AWD Jan 28, 2010 · so few weeks ago i noticed my 01 IS300 E-Shift with 138,000 miles is having some sluggish/hesitation when giving throttle from a dead stop but it only does it about 70% of the time. Sep 16, 2019 · Guys, I have been having a problem with my 5 speed Manual IS. What are the common symptoms of OBDII code P0505 in a Lexus related to the Idle Air Control System? - Common symptoms include erratic idle speed, stalling at idle, and potential difficulty starting the vehicle. New spark plugs, new spark wires, new VVTi Solenoid, replaces some vacuum lines, and cleaned MAF. Only specifically when I'm revving from idle, the car bogs/hesitates from idle to about 2-2500 rpm then revs just fine after 2500 rpm . Anything below that and you'll notice your car shudder. Sep 25, 2013 · My idle has been way off so i adjusted the set screw and the car idles fine now but when i push the gas pedal the throttle doesn't work at all until the gas pedal is pushed almost to the floor. No trouble codes set. I know my Mar 30, 2025 · does idle fine when cold start? does it idle crap after it warms up? I have a similar problem when it warms up, the idle will drop and keep dropping all the way down to a couple hundred rpm and then misfire a little and then die. Time for a quick & accurate diagn Oct 18, 2013 · It first started where the car would have an occasional little shimmy/hiccup during idle in drive, it felt like the car was getting the chills. Ship fast and save more on LexusPartsNow. I open the hood and you can visibly see the engine shaking. Idle is also the same in park. Switching eco mode gives a normal idle (600-700) and when the engine is fully warm it idles normal in any mode. Under A/C load, it gets much worse and shakes the entire car pretty aggressively. I'd be cruising and when I'd stop at stop sign, stop light ect. I have so far changed the timing belt and tensioner, plugs and wires, ocv, cleaned the screen, fixed cracked lines, new vacuum hoses, fuel strainer, fuel filter, tried 4 different maf's, and cleaned the injectors (removed and cleaned) I have searched around all the lexus forums for the last week with no help on my current problem. With VVTi valve overlap can be controlled to create an EGR effect, eliminating the need for an EGR valve. Cause (probable): Dirty fuel injectors, dirty engine valves, and combustion chamber deposits Fix: Chevron Techron Concentrate Plus (or similar known PEA-containing (polyether amine) fuel system cleaner products like Gumout Regane, Redline SI-1, Amsoil Performance Improver, and BG The car will start up, it will idle regularly, and in park I am able to rev way past over 3k, reaching almost 5-6k. Okay so. Nov 23, 2023 · My target idle ignition timing is 15°, but ECU dithers +/- 10° to control idle speed. In this article, we’ll look at some of the most common causes of a rough idle in the IS 300 and how to fix the problem. at the Jan 28, 2010 · so few weeks ago i noticed my 01 IS300 E-Shift with 138,000 miles is having some sluggish/hesitation when giving throttle from a dead stop but it only does it about 70% of the time. However, when I drive, my car seems to lack power and sometimes wont accelerate, or has poor acceleration. I cleaned the maf sensor and gave the throttle body a good scrubbing and it got worse. 90 Day warranty on parts. Backed by Lexus's warranty, Idle Control Valves restore factory performance. --AC RIPPLE: alternators essentially produce 3 phase AC current and a six pack diode configuration converts the AC to DC current. It smooths out Jul 23, 2012 · Replace defective parts There is no idle air control valve, no idle speed controller, or EGR system. If I'm in drive at a stop or in reverse stopped, my rpms sometimes go as low as 600 but it has done that since 2002. To turn up the idle which way should i move it? Towards the driver or passenger side? GGP IS300-2. Mar 18, 2025 · An idle speed relearn procedure is a process that allows your vehicle’s computer (the Powertrain Control Module or PCM) to reestablish the ideal idle parameters.