1998 Toyota Camry Rough running

Tiny
DAVID DIRITO
  • MEMBER
  • 1998 TOYOTA CAMRY
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 10,700 MILES
Four times in the last year or so the engine will run rough when hot. It has full power, engine growls and idles very rough. After engine turned off and cools, it will start and run normally. We had the dealership shop run a computer check which found no problem.
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Tuesday, July 6th, 2010 AT 3:17 PM

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Tiny
RASMATAZ
  • MEMBER
Engine running rough or misfiring can be cause by the following:

1. Defective spark plug
2. Inadequate spark/coil, defective spark plug wire.
3. Lack of compression
4. False air leakage.
5. Faulty fuel injectors.
6. Insufficient fuel pressure.
7. Contaminated fuel.
8. EGR valve that is leaking.
9. Oxygen sensors.
10. Throttle position sensor.
11. Idle air control valve.
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Tuesday, July 6th, 2010 AT 6:53 PM
Tiny
TECHNIKER
  • MEMBER
While this does not sound like a true IAC problem, it could not hurt to go ahead and eliminate it. The IAC becoming clogged up tends to be a problem with our Camry's.

Take the bellows off the car (remove the vacuum line coming from it and MAF electrical connector so that it is easier to remove). The bellows is the big black arm that connects the air filter to the intake manifold.

Take some throttle body cleaner (make sure it is throttle body cleaner and not just carburetor cleaner- regular carburetor cleaner can mess up the electrical components of the IAC) and spray it into throttle body to clean the inside of it. Pull on the throttle adjuster just to the side to open the valve. I also tend to lubricate the valve a little while I am there.

As for actually cleaning the IAC, there is a keyhole-shaped hole at the bottom of the throttle body. Spray some throttle body cleaner into there and let it soak for about 30 minutes. Then spray some more in there again. Reassemble everything and start up the car. The IAC is now relatively clean and your idle (as well as acceleration) should be much better.

-Techniker
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Wednesday, July 7th, 2010 AT 11:26 AM

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