99 Honda Accord RPMs Go Up and Down

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Leshka44

Member - Posts: 9

Joined: January 16, 2004

Location: Russian Federation

Posted: January 27, 2004 at 1:08 AM / IP Logged

Hi does any one can help me whit my prblem. when the car is worm the rpms go up and down on the nutrual position.. i know i need to change a sensor behind throttle body but i dont know the name for that censor. can any one help

geepherder

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Joined: October 27, 2003

Posted: January 27, 2004 at 8:27 AM / IP Logged

You're looking at the TPS- aka throttle positioning sensor. Also make sure you don't have any vacuum leaks, your ignition system is healthy, and the timing is correct. Check the air filter, then check your other sensors with a multimeter (a repair manual will show you how). I've seen a bad coolant temperature sensor do the same thing.

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rbbrink

Member - Posts: 23

Joined: November 28, 2003

Location: United States

Posted: January 27, 2004 at 10:33 PM / IP Logged

What year and trim grade (EX LX DX) L4 or V6? Some years have a couple of devises tha control idle speed. One is conrtoled by the ECM using an electric motor the other is thermo, and opens and closes a valve w/ engine heated coolant. Try checking the coolant level, if it is very low the coolant temp sensor can't get a good reading of how warm the engine is. If it is low find the leak and repair it first. Also, try to adjust the base idle screw. It is on the upper left side of the of the throttle body on the opening side( looking into it). It is probably covered w/ a film of silicon sealant ( installed by the factory), if it isn't some one has altered it's position. Poeple will adjust up idle to compensate for bad mounts. Slowly turn it clockwise, while the engine is warm, to get desired RPM. Do not over tighten, it should be turned out approx. 2 1/2 to 3 turns from bottom. Giv e that a try and post back

Leshka44

Member - Posts: 9

Joined: January 16, 2004

Location: Russian Federation

Posted: January 30, 2004 at 12:59 AM / IP Logged

Well my car was damaged in front and the engine went back and broke one of the two sencors in there but i just want to know the name of it.

geepherder

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Joined: October 27, 2003

Posted: January 30, 2004 at 7:56 PM / IP Logged

The sensor behind the throttle body is the TPS, or throttle positioning sensor. The one on top is usually the MAP sensor. You may need to buy another throttle body. That's what I had to do, since it was actually riveted on, and neither the dealer, nor the junkyard will sell it seperately. Thanks, Honda. What you may do is look up your vehicle on www.hondaautomotiveparts.com, and see if you can identify the sensor. Also take a look at your throttle body to see if indeed it is riveted in place. If it's held in place with tamper-resistant screws, you can break them loose with a chisel and hammer, and replace them with regular phillips head screws. The problem here is you still may not find it sold seperately. Good luck.

My ex once told me I have a perfect face for radio.

rbbrink

Member - Posts: 23

Joined: November 28, 2003

Location: United States

Posted: January 30, 2004 at 11:38 PM / IP Logged

Unfortunately the TPS is not available seperately from the throttlebody, and most junk yards will probably only sell you the whole throttlebody, it's expensive new anyway. Setting the angle to mach the throttle blade correctly with out the right scanner would also be kinnda difficult. Get the used parts and just replace all the gaskets and o-rings

itmdtr

Copper - Posts: 131

Joined: May 23, 2003

Location: United States

Posted: January 31, 2004 at 6:02 AM / IP Logged

The name your looking for is a IACV : Idle Air Control Valve.

itmdtr

auex

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Posted: January 31, 2004 at 8:35 AM / IP Logged

Could be a vacuum leak as well.

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rbbrink

Member - Posts: 23

Joined: November 28, 2003

Location: United States

Posted: January 31, 2004 at 2:54 PM / IP Logged

If it's an L4 than both idle control parts on the front side of the intake. Not likely to get damaged from a collision. Check the vacumm line that goes to the brake booster, it comes off a pipe on the rear of the manifold, could be a huge leak. If you tell me the year and model and maybe attach a pic of the part it would be a big help.

Leshka44

Member - Posts: 9

Joined: January 16, 2004

Location: Russian Federation

Posted: February 02, 2004 at 3:49 PM / IP Logged

This is Honda Accord 99 lx. manual tranny. I think its TPS sensor. I have no a vacume leak... I see the sensor in the back of throttle so probably TPS sensor,

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