anochuks08: Please I need your assistance auto gurus. My 1999 Rav4 increases its RPM on its own. In the morning, it might idle at 1000 rpm, it will be steady without any rough idle, when I drive off and lets say on reaching a traffic and I switch my gear selector to neutral, it goes high from 1600 to 1800. I might be forced to go back to drive so as to reduce its RPM. Lets say after the days' work, it will idle at 800 to 700. My mechanic doesn't know what to do cos all he does is to manually adjust the RPM to 1000 anytime I come, but as soon as I leave, it adjusts its RPM on its own. Please help, all contributions are welcome. Thanks

anochuks08: went for a scan and got ISO 9141-2. The person that did the scan said its the injector mouth. the image of what he pointed out is the 3rd picture posted by gazzuzz

GAZZUZZ:

Iso 9141-2 is not a scan result, its a n obdII protocol.

I hope your problem has been solved?

mayor2013: Are you in lagos? Call this number to run a scan 08165520837 or 08156087872

mayor2013: Are you in lagos? Call this number to run a scan 08165520837 or 08156087872

Bossmd:

Honestly I think it's better for one to just get his own scanning tool. I called that no for scanning and the dude said he'll collect 7k just to scan my car, imagine. It's not as if he will fix any issues oh, and the scanner may not even interprete the codes sef. Taah!

Some Scanners cost just 14k which will become your property and you can use anytime.

GAZZUZZ:

I don't think you are being fair to mayor2013, not every one scans with a 14k scanner, some of the scanners I use cost more than 350k, and its not just about scanning a car, interpreting the results requires knowlede and experience you can't develop it over night. Buying your own scanner is a good idea infact I encourage every car user to have one, but a 25k scanner will only scan your engine module in most japanese cars,scanning transmision might be vague in some cases.

I know of a lot of workshops what would charge much more if you took your vehicle there, and would charge seprately for the repair work, and you might have to wait a while.

GAZZUZZ:

I don't think you are being fair to mayor2013, not every one scans with a 14k scanner, some of the scanners I use cost more than 350k, and its not just about scanning a car, interpreting the results requires knowlede and experience you can't develop it over night. Buying your own scanner is a good idea infact I encourage every car user to have one, but a 25k scanner will only scan your engine module in most japanese cars,scanning transmision might be vague in some cases.

I know of a lot of workshops what would charge much more if you took your vehicle there, and would charge seprately for the repair work, and you might have to wait a while.

anochuks08: Thanks Chikason, I will give you a call, but my car aint modern, are you sure any form of bluetooth connectivity will work on it? Am making plans to buy Maxscan OBDII/EOBD Scanner GS500. How good is this scanner?

chikasin4:
Or Anochukwu i also own a small bluethooth ELM 324 scanner and also live at Enugu. I can scan it for free for u if u want. Cheers

Experience4u:

Chikason, can you help me scan my car, it has a check engine light and consumes more fuel. I reside in Enugu. Thanks

anochuks08:
I can help you scan n get you the trouble codes.

Experience4u:

Please can I have your contact so as to call you. Thanks

anochuks08:
07032801543

GAZZUZZ:
Your 1999 rav4 engine should have a 3s-fe engine, normally when you start your car in the morning your engine rpm will be high (about 1000rpm~12000rpm) in about 5-10mons it would have dropped to normal (700~800rpm). Provided your thermostat is NOT removed and your fans are not blowing constantly you should expect normal RPM in 5-10mins. Unfortunately most car users in nigeria remove their thermostats and put their fans on full speed and this might cause a delay b4 your RPM returns to normal.

Your coolant temp sensor(pics attached) tells the "brain box" the current temp of the engine, if it constantly reports a cool temp the rpm will continue to run high and the engine will continue to run rich until it can achieve a temp of about 82degrees Celsius.

Your car is also fitted with an idle air speed valve(pics attached), which is located on the throttle body, the valve adjusts the rpm of your engine by regulating vacuum from the intake. The idle speed valve gets dirty after a while and as a result gets stuck.
The valve is controlled by the "brain box"

Throttle body(last pic)White coloured component=(IACV)

My recommendations

Run a scan on your vehicle

Check for any leaking vaccum pipes or hoses

Check that your coolant temp sensor is connected properly and is functional.

Open and service idle speed valve,( all that is required is a can of carburettor cleaner.) Replace if its defective (3,000 max)


Best of luck.