1999 civic lx problem - TriStateTuners.com :: Home of Tristate Auto Enthusiast

240vert · 03-12-2009, 06:57 PM

My brother's 99 lx started having some problems. The idle would drop to zero every now and then. I took of the IACV and TB and cleaned them, then installed everything back together and the idle started bouncing from 1k to 2k.
I disconnected the battery to reset everything, then ran the car until it got warm, shut it off, let it run for a minute, shut it off, then turned it back on, and the idle just started bouncing faster. It eventually went back to going to 1k and 2k.

I disconnected the battery again, waited for the motor to cool down, started it up and kept the rpms at 3k until the fan kicked on, and then let it idle for 5min. It still kept bouncing between 1k and 2k.

When I put my hand over the tb it still runs. The two openings inside the tb have air constantly running into them, and I can still hear them with my hand over the TB. Today I started it up and it ran at 1600rpms until it got warm, then it just started bouncing between 1k and 2k again.

The guy who read the codes at Advance auto said he couldn't didn't know what the code was, and didn't give me a printout so I could search for it. Could it be possible the IACV does need replaced?
I have everything plugged in where it's supposed to be.

Thanks for your help.

driftingrx5.7 · 03-13-2009, 12:13 AM

do you know how to read the code from your blinking CEL?
if not here is the link for it
http://www.tristatetuners.com/forum/...ad.php?t=52999
here is a quick picture of what the connector looks like

240vert · 03-13-2009, 12:59 PM

Thanks, I actually didn't know about that. I'll have to give that a try when I get off work.

driftingrx5.7 · 03-13-2009, 02:23 PM

let me know if you need me to help you read the code

240vert · 03-14-2009, 04:35 PM

I got Idle air malfuntion
o2 sensor heater not working
o2 sensor

I just drove it back to Advance myself today and they were a lot more helpful and actually showed me the codes instead of saying that don't know what that one means. Maybe the Hanover Toyota shirt helped.

Which O2 sensor would it most likely be?

highmilehatch · 03-16-2009, 12:32 PM

If you removed the TB you may have gotten air in the cooling system. Start the car up cold with the rad cap off and let it bleed. Once the lower hose is hot you know the t-stat is open. Top off the coolant.

Also, if your covering the holes in the tb with your finger and it doesn't stall, that usually indicates a vacuum leak. Check all your vacuum lines.

driftingrx5.7 · 03-16-2009, 01:56 PM

Quote:

Originally Posted by 240vert

I got Idle air malfuntion
o2 sensor heater not working
o2 sensor

I just drove it back to Advance myself today and they were a lot more helpful and actually showed me the codes instead of saying that don't know what that one means. Maybe the Hanover Toyota shirt helped.

Which O2 sensor would it most likely be?

your car is obd2b in the error code it should of told you
61 Primary oxygen sensor
63 Secondary oxygen sensor circuit
65 Secondary oxygen sensor heater

if it was primary then its the one before the cat on the top of the header if it was secondary it would be after the cat or right in the middle of the cat. i can't remember right now but i think your exhaust manifold looks like this

as you can see the one on the top is primary and the one on the bottom is secondary

the other code should of been
14 IAC (EACV) - idle air control valve
which means replace it. i know some people can fix them or clean them but i dont know how

240vert · 03-16-2009, 06:12 PM

I took it to work and scanned it myself this time. It's P0132 bank 1 sensor 1. Would that be a culprit of a high idle? I'm gonna go bleed the cooling system right now, and try to find a leak.

Whats the stuff you can spray and it makes the engine rev up if it's getting sucked in?

Would a bad IACV keep the motor running when you put your hand over the tb?

Thanks again for all the help

03-12-2009, 06:57 PM	#1
240vert Tri-State Aficionado Join Date: Nov 2008 Member #10173 My Ride: 93 240SX Convertible iTrader: (0)	1999 civic lx problem My brother's 99 lx started having some problems. The idle would drop to zero every now and then. I took of the IACV and TB and cleaned them, then installed everything back together and the idle started bouncing from 1k to 2k. I disconnected the battery to reset everything, then ran the car until it got warm, shut it off, let it run for a minute, shut it off, then turned it back on, and the idle just started bouncing faster. It eventually went back to going to 1k and 2k. I disconnected the battery again, waited for the motor to cool down, started it up and kept the rpms at 3k until the fan kicked on, and then let it idle for 5min. It still kept bouncing between 1k and 2k. When I put my hand over the tb it still runs. The two openings inside the tb have air constantly running into them, and I can still hear them with my hand over the TB. Today I started it up and it ran at 1600rpms until it got warm, then it just started bouncing between 1k and 2k again. The guy who read the codes at Advance auto said he couldn't didn't know what the code was, and didn't give me a printout so I could search for it. Could it be possible the IACV does need replaced? I have everything plugged in where it's supposed to be. Thanks for your help.

03-13-2009, 12:13 AM	#2
driftingrx5.7 Tri-State Post Whore Join Date: Dec 2006 Location: Poconos PA Member #3099 My Ride: 88 rx5.7 iTrader: (0)	do you know how to read the code from your blinking CEL? if not here is the link for it http://www.tristatetuners.com/forum/...ad.php?t=52999 here is a quick picture of what the connector looks like __________________ my v8 rx7build To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.

03-13-2009, 02:23 PM	#4
driftingrx5.7 Tri-State Post Whore Join Date: Dec 2006 Location: Poconos PA Member #3099 My Ride: 88 rx5.7 iTrader: (0)	let me know if you need me to help you read the code __________________ my v8 rx7build To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.

03-16-2009, 12:32 PM	#6
highmilehatch Tri-State Addict Join Date: Oct 2005 Location: PA Member #929 iTrader: (3)	If you removed the TB you may have gotten air in the cooling system. Start the car up cold with the rad cap off and let it bleed. Once the lower hose is hot you know the t-stat is open. Top off the coolant. Also, if your covering the holes in the tb with your finger and it doesn't stall, that usually indicates a vacuum leak. Check all your vacuum lines. __________________ 92 SC300 - 2JZGTE 93 Civic Si - 11.3@125 stock block pump gas FOR SALE

03-16-2009, 06:12 PM	#8
240vert Tri-State Aficionado Join Date: Nov 2008 Member #10173 My Ride: 93 240SX Convertible iTrader: (0)	I took it to work and scanned it myself this time. It's P0132 bank 1 sensor 1. Would that be a culprit of a high idle? I'm gonna go bleed the cooling system right now, and try to find a leak. Whats the stuff you can spray and it makes the engine rev up if it's getting sucked in? Would a bad IACV keep the motor running when you put your hand over the tb? Thanks again for all the help Last edited by 240vert; 03-16-2009 at 06:16 PM.

03-13-2009, 12:59 PM	#3
240vert Tri-State Aficionado Join Date: Nov 2008 Member #10173 My Ride: 93 240SX Convertible iTrader: (0)	Thanks, I actually didn't know about that. I'll have to give that a try when I get off work.

03-14-2009, 04:35 PM	#5
240vert Tri-State Aficionado Join Date: Nov 2008 Member #10173 My Ride: 93 240SX Convertible iTrader: (0)	I got Idle air malfuntion o2 sensor heater not working o2 sensor I just drove it back to Advance myself today and they were a lot more helpful and actually showed me the codes instead of saying that don't know what that one means. Maybe the Hanover Toyota shirt helped. Which O2 sensor would it most likely be?