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Discussion Starter #1
We have a RAV4 2000 where we are having issues with hesitation at the moment. We've changed the plugs, had the coils checked, put fuel injector cleaner in it, cleaned out the Mass air flow sensor and it's still hesitating. It starts up fine, idles well and goes well apart from the hesitation. Can anyone suggest anything??
 

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1999 Toyota RAV4 with 3MZ-FE 6 cylinder engine, camo wrap, OME lift, heavily modded
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I assume that you have checked the OBDII codes? Possibly an O2 sensor, but it should throw a code.
 

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1999 Toyota RAV4 with 3MZ-FE 6 cylinder engine, camo wrap, OME lift, heavily modded
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You can buy a bluetooth OBDII reader like this one (there are many more out there) - https://www.amazon.com/ScanTool-427201-OBDLink-Bluetooth-Professional/dp/B00H9S71LW/ref=sr_1_7?ie=UTF8&qid=1489803235&sr=8-7&keywords=obdii+reader+bluetooth. simply download an app like torque into an android tablet or phone and plug the reader into your OBDII plug (above the gas pedal, looking towards the center console), and link the devices. Once linked you can see any codes, clear the codes, and see what is happening in real time. On first generation RAV4s it isn't as much information as later cars but it is helpful. I use one all the time to just make sure things are going well.

The codes tend to be somewhat generic, one code can be several things, but it helps to narrow the search.
 

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Discussion Starter #6
Done air filter but haven't looked at fuel filter and spoke to mechanic this morning about it and he's going to check that out for us next week, he reckons we have problem solved almost everything else so fingers crossed it's that. Thanks :)
 

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In many locations, part-stores like Autozone will read the codes for free.
 

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1999 Toyota RAV4 with 3MZ-FE 6 cylinder engine, camo wrap, OME lift, heavily modded
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This is a problem with a lot of threads, someone starts one asking for help but never follows up and lets us know what the final diagnosis was. Are you having a similar issue? Check out Scotty Kilmer on YouTube he has a lot of videos on diagnostics.
 

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Yes it is frustrating to read through to the end and never see an update.

I am having a hesitation, but it’s only when I barely have to touch the gas like at 30 MPH in town and requires only the lightest throttle. I’ve done plugs abs cleaned throttle body and all the common suggestions.

Thank you so much for the YouTube suggestion!
 

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1999 Toyota RAV4 with 3MZ-FE 6 cylinder engine, camo wrap, OME lift, heavily modded
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There are so many things it can be, but first what RAV4 do you have. It would help a lot if you added a signature block that gives us the info at a glance.

Common hesitation problems with the RAV4.1:
- First run an OBDII scan and see what pops up
- Gas cap
- Fuel Filler hose leaking
- Vacuum leaks, change all vacuum lines
- Dirty parts
-- Throttle body, you said you already did that
-- EGR needs cleaning, again you said you already did that
-- Air filter needs replacing
-- Idle Air Control see http://www.rav4world.com/forums/85-4-1-faults-fixes/66739-illustrated-idle-air-control-iac-cleaning-instructions.html
-- Fuel Filter
-- Fuel Injectors see http://www.rav4world.com/forums/85-4-1-faults-fixes/256177-how-clean-fuel-injectors-your-car.html
-- Clogged fuel sock in the fuel tank
-- Cheap gas/contaminated gas - add some Sea-Foam Motor Treatment to the tank
- Throttle Position Sensor see http://www.rav4world.com/forums/85-4-1-faults-fixes/258146-your-throttle-position-sensor-bad.html
- MAP Sensor see http://www.rav4world.com/forums/85-4-1-faults-fixes/256201-map-sensor-diagnosis-understanding-function.html
- In general see http://www.rav4world.com/forums/85-4-1-faults-fixes/256185-how-fix-car-idles-poorly.html
- Hesitating with p0171 code - see http://www.rav4world.com/forums/85-4-1-faults-fixes/256193-fixing-hesitating-car-p0171-code-vacuum-leak-faulty-fuel-system.html
- Ignition wires
- Spark plugs
- Distributor cap if made before 1998

A lot of the above will throw codes so you need to check with an OBDII. No codes often point to the fuel system.

Diagnostics
- http://www.rav4world.com/forums/85-4-1-faults-fixes/256529-test-dont-guess-when-fixing-your-rav4.html
- http://www.rav4world.com/forums/102-rav-lounge/276033-dash-light-meanings.html
- http://www.rav4world.com/forums/85-4-1-faults-fixes/256209-secret-engine-problem-diagnosis-fuel-trims.html

And don't forget that blinker fluid see http://www.rav4world.com/forums/102-rav-lounge/284417-dont-forget-most-vital-fluid-all-generations-rav4.html

I hope some of this helps and some of it gives you a good laugh.

Keep us posted
 

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Thank you! It’s a 2007 4 cyclinder 2 wheel drive.

I changed the air filter. I was thinking throttle position sensor too, but I can’t find one on this engine. I have checked the codes with my scanner and the parts store just to be sure. No codes. I use sea foam every 5000 Miles. I bought it used and it has idled rough and hesitated since day one. Ideal is rough unless the lights and/or AC is on. It idles close to 500 rpms. It’s the craziest thing. I also cleaned the Mass airflow sensor.

I haven’t done coils or anything fuel other than sea foam. I’ll spray some soap water and look/listen for vacuum leak soon.

A big help would be to know am I crazy that I can’t find a throttle position sensor for this year?
 

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1999 Toyota RAV4 with 3MZ-FE 6 cylinder engine, camo wrap, OME lift, heavily modded
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You should be posting and looking in the "RAV4.3 Third Generation (2006-2012 Models)"

I don't have much info on that year but to do a proper search go to a Toyota parts online dealer like Online Toyota Spare Parts Catalog for United States market. Toyota Frame Number Search and Part Number Search. VIN Decoder. and enter your RAV4's information. The VIN and the the number on the identa-plate like mine is a SXA11L-AWMGKA. Then you can easily find what parts are available. Have you looked on the throttle body to see if there is a TPS? If there is you may be able to get a part number off of it.

The Idle Air Control is another area where hesitation is a common characteristic. see https://www.rav4world.com/forums/85-4...tructions.html.

Remember, don't buy, diagnose.
 

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1999 Toyota RAV4 with 3MZ-FE 6 cylinder engine, camo wrap, OME lift, heavily modded
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Hey eodgater, If You would please indulge me one more time because you are so knowledge and responsive. Does this make any sense to you at all? I changed the oil and went with full synthetic mobile 1 5W-20. I don’t know what it had before, but it looked clean. All the sudden, the hesitation is gone and the idle is much smoother. I use the same oil in all my cars, and I have never seen anything like this improvement! Does this even make sense to you? They would’ve had to have some kind of super heavy weight oil, but it was done by a lube place based on the sticker. Thank you in advance for your time and expertise.
 

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1999 Toyota RAV4 with 3MZ-FE 6 cylinder engine, camo wrap, OME lift, heavily modded
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Hey eodgater, If You would please indulge me one more time because you are so knowledge and responsive. Does this make any sense to you at all? I changed the oil and went with full synthetic mobile 1 5W-20. I don’t know what it had before, but it looked clean. All the sudden, the hesitation is gone and the idle is much smoother. I use the same oil in all my cars, and I have never seen anything like this improvement! Does this even make sense to you? They would’ve had to have some kind of super heavy weight oil, but it was done by a lube place based on the sticker. Thank you in advance for your time and expertise.
Yes, it makes sense that it runs better with fresh synthetic oil, particularly if it had been too long between oil changes or too heavy an oil was in the engine. The synthetic oils have a better viscosity than regular oil, is usually very good at cleaning and staying in place so you don't have dry starts if the engine sits a while. The oil pump is able to move the oil where it needs to be easier. And finally oil provides about a third of your engines cooling so a better quality fresh oil will run a lot better and keep the engine cooler.

I don't trust those anyone to change oil on my engines unless I watch them and then because they usually have those hoses running with the oil you have no idea what they actually put in there. IIf you want someone else to your oil changes, bring your own oil and watch them.

There may be some disagreements from some folks on this but it is what I've learned from working on all sorts of engines for over 50 years.
 

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1999 Toyota RAV4 with 3MZ-FE 6 cylinder engine, camo wrap, OME lift, heavily modded
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