Question about 1990 Toyota Camry
Throttle fluxuating up and down and stepping on throttle does nothing at all
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
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
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
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
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
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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