Question about 1990 Toyota Camry

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Does it really work to clean my IAC or do i need a new one

Throttle fluxuating up and down and stepping on throttle does nothing at all

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  • Toyota Master
  • 3,961 Answers

They are expensive, costing anything up to $150, so I'd try cleaning it first. There is a good chance that will be enough.

Posted on Jan 23, 2013

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Posted on Jan 02, 2017

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SOURCE: iac and throttle body

Cleaning the throttle body is no big problem; simply remove the air filter box, and remove the tube from the air filter box that connects to the throttle body. Spray carb cleaner on the flap valve and all around the flap valve. Regarding you idle condition, cleaning the Idle Air Control valve (IAC) may do you no good. Once it fails, it is usually done. You prob need to install a replacement IAC. It is UNDER the throttle chamber, you will see it when you remove the air tube to the throttle body. I change several of these a month. Common failure.

Posted on Sep 24, 2008

wobin0588
  • 16 Answers

SOURCE: Dear readers, I am having a problem with a rough

It could be your MAF Mass Air Flow Sensor a bad resistor inside the sensor can cause a rough idle(MAF measures the air going into your engine and can cause many problems.) On top of that you should also check your EGR Exhaust Gas Release/Recirculation Valve that can also cause a rough idle(EGR Releases/Recirculates Exhaust gases into certain cylinders to cool them down and bring the engine temp. down or up(with restriction of exhaust Gases) but can cause a rough idle, Possibly just need to Clean you IAC EGR and MAF and you should be all set.

Posted on Jul 20, 2009

  • 22 Answers

SOURCE: 1993 Toyota Camry IAC cleaning

1) remove the black intake hose from the throttle body
2) get a can of throttle body/intake cleaner
3) be VERY careful if you decide to use the straw included with the can of cleaner, it can detach and go inside of your intake manifold.
4) spray inside and use a rag to remove junk from throttle plate(front and back side), hold the straw on the cleaner can and spray into the hole just ahead of the throttle plate, let soak for 10 minutes or so
5) reattach intake hose and start engine - you may get black smoke/rough idle for a minute as junk exits the engine

Posted on Jul 22, 2009

dmsr63
  • 2050 Answers

SOURCE: misfiring

See what cylinder is loosing (if that's it) spark. Use a spark tester if you can, or remove plugs and turn it over with the wires on all of the plugs, grounded!

Posted on Jul 29, 2009

  • 92 Answers

SOURCE: CLEAN THROTTLE BODY ON AUTO - TOYO CAMRY 98 -WANT

have been spraying into throttle bodies for years, never had a problem messing up plugs. but if you are insistent, you can remove the throttle body from the intake and clean it outside of the car. note that you may need to replace throttle body gasket after removing it depending on how well it comes apart and how well it seals once put back together.
Here's one more idea if you're careful, though i don't think i recommend this. You could stuff a small clean shop rag just through the throttle flap so it's actually in the intake manifold (make sure you can get it back out when you're done) and then spray all through the throttle body. The rag should soak up any excess fluid and then pull it back out when you're done. The reason i don't recommend this is because you may get fibers or other unfiltered debris in the intake and then into the cylinders which could theoretically scratch your cylinder walls and compromise compression to a degree or cause you to burn oil (yeah i guess it's not likely but it has to be possible).

Posted on Sep 29, 2009

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84 mustang 5.0 auto-Idle problems. runs Ok when cold , runs rough and stalls when warm. 1st year throttle body injection. was told the IAC valve needs cleaned. can`t find on car


the iac sensor is along the side of throttle body , did you give the throttle plate area a good cleaning out this is where the air path is for the IAC sensor , a lot of idle problems have been fixed with a can of throttle body cleaner and few good squirts of the stuff down the hole

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Unfortunately many car manufacturers don't like it when people do it themselves, so they have a little b**by-trap they like to spring on you. If you replace the TPS, IAC, etc, the idle will many times no go back to normal and you will need to have the computer "relearn" so it can rest it back to normal! No real reason for them to design it this way, except of course to force you to go to the dealer to get it fixed! Nice little surprise they like to give their customers!

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1 Answer

RPM's rev high and low


"Could this be a throttle positioning sensor problem?" - probably not. The Throttle Position Sensor (TPS) tells the computer how hard you are stepping on the gas. It does not really control idle speed.

Your problem is more likely the Idle Air Control (IAC) valve. This is a small electric valve that the computer can open and close in small steps to set the idle RPM at the desired point (a little higher when cold, then down to normal speed when warm). The IAC valve is notorious for getting all crudded up inside. Then it sticks open too much (really fast idle speed) or sticks shut (really low speed).

You can try taking it off the engine, cleaning it with carb cleaner spray, and putting it back on. That is easy and cheap.

If cleaning does not fix it, you need to buy a replacement valve and put it on. Pretty easy to do but costs more $$$.

Apr 29, 2013 | 2000 Honda Odyssey

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Have a 1996 Mitsubishi Galant and need intstuctions on how to replace the Idle Air Control Valve


You'll have to remove the throttle body to replace the idle air control (IAC) valve. First, disconnect the negative ground cable from the battery. Then remove the vacuum line and air duct intake. Then disconnect the IAC and throttle position sensor (TPS) electrical connections. Remove the coolant hoses that are connected to the IAC. Disconnect the throttle cable from the throttle body. Now, remove the 4 bolts that hold the throttle body to the manifold and remove. Be careful with the gasket located between the throttle body and manifold and replace it in the same position. On your clean work surface, turn the throttle body over and remove the 4 phillips head screws holding the IAC to the throttle body. Clean the parts with a dry cloth but do not use solvents on the IAC or TPS. That's it!

Dec 16, 2010 | 1998 Mitsubishi Galant

1 Answer

Car kills when you take foot off gas.


Check to make sure the IAC valve is not stuck in the bore in the throttle body. With the air snorkel removed from the throttle body you should be able to look down at the throttle body. Just to the rear of the throttle plate there will be an opening. Can you see the pintle of the IAC?

Take a small screwdriver and carefully push the pintle the drivers side. then try starting the car. If it starts and idles you need to remove the IAC, clean the air in the throttle body that the IAC uses, and try cleaning the IAC.

If you can see visible wear on the IAC pintle head replace it. The combination of the air passage being carboned up and the worn out pintle head are what cause it to get stuck.

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It sound like your idle air control (IAC) valve is dirty and the fuel injectors. Try cleaning the throttle body and IAC with throttle body cleaner, if it's really bad you may have to use two cans of throttle body cleaner to make sure you have all of the carbon and varnish cleaned out. If this does not help, then there is a good chance that the IAC has gone bad and needs to be replaced but also check the wire harness to the IAC and TPS on the throttle body. Good luck and hope this helps and it would not hurt to replace the fuel filter also.

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It is most likely the EGR (Exhaust Gas Recirculation) valve.
The valve is supposed to close when the car is idling and open other wise.

Inspect it / Replace it.

Hope this helps!

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