Honda Prelude Forum
 
Go Back   Honda Prelude Forum > Tech-Talk > 4th Gen Honda Prelude

Thread Title
Driving with Sensor "Issues"

 
Reply
 
LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old 08-24-2010, 05:44 PM
LilMsPrelude's Avatar
Platinum Member

 
Join Date: Jun 2008
Location: Boise, Id.
Posts: 2,294
iTrader: (4)
LilMsPrelude has a reputation beyond reputeLilMsPrelude has a reputation beyond reputeLilMsPrelude has a reputation beyond reputeLilMsPrelude has a reputation beyond reputeLilMsPrelude has a reputation beyond reputeLilMsPrelude has a reputation beyond reputeLilMsPrelude has a reputation beyond reputeLilMsPrelude has a reputation beyond reputeLilMsPrelude has a reputation beyond reputeLilMsPrelude has a reputation beyond reputeLilMsPrelude has a reputation beyond repute
Driving with Sensor "Issues"

ok.... be nice to me. This is the point where I need nechanical assistance.

( FYI: Nee is NOT mechanically inclined)

first: the detail

My car is a 1992 Si with the H23A engine.
I recently replaced (a week ago) the Distributor Cap and Rotor
Spark Plugs and Spark Plug wires
I then re-set my ECU by pulling the radio/clock fuse under the hood.

This weekend I traveled just a little over 500 miles. After about 130 mi. my CEL came on.
I pulled the codes and it was for the Heated Oxygen Sensor and the Knock sensor. Per my on-line search these will cost me about $220 to replace, money I do not have right now.

My research tells me that my ECU may not balance the air/fuel mixture properly due to the HO2S being bad..... even tho I got a record (for my car) 29.2 MPG!! ...
Can I drive my car this way until I can afford to replace the sensor(s)?
I believe after looking at the repair manual I can replace these myself so it is just a matter of time and a little saving/not going to the movie house for a few paychecks.

What exactly is/can happen or be detrimental about not replacing the knock sensor right away? It is the Expensive one at over $110!
I filled my car with 91 Octane (the highest I can get locally) and added an octane booster/additive. The car is running great. Possibly better than it has in a long time.
__________________
Quote:
Originally Posted by shatterbox View Post
People say the biggest difference you can change to your system is to add a subwoofer. Which is true, it is the most noticable difference. But running an amplifier to a good set of speakers makes the BEST difference.

_____________________
Understanding The Basics - Electronics & Car Audio
An In Depth Look At Relays
The "Big Three" DIY Install
Alarm & Remote Start DIY
My Babies Thread
Reply With Quote
  #2 (permalink)  
Old 08-24-2010, 09:14 PM
Jamie's Avatar
Platinum Member
 
Join Date: Dec 2009
Location: New Port Richey (Tampa) FL
Posts: 1,187
iTrader: (1)
Jamie has a reputation beyond reputeJamie has a reputation beyond reputeJamie has a reputation beyond reputeJamie has a reputation beyond reputeJamie has a reputation beyond reputeJamie has a reputation beyond reputeJamie has a reputation beyond reputeJamie has a reputation beyond reputeJamie has a reputation beyond reputeJamie has a reputation beyond reputeJamie has a reputation beyond repute
Re: Driving with Sensor "Issues"

Quote:
Originally Posted by LilMsPrelude View Post
Can I drive my car this way until I can afford to replace the sensor(s)?
Yes, you'll be fine. When the O2 sensor fails, the ECU defaults to a slightly rich mixture to insure the engine doesn't lean out at speed, which is why your mileage may go down. Not a big deal unless you're coming up on an emissions test (which I don't think they do in ID?). The O2 sensor's not difficult to replace, especially if you have access to a lift. It sticks out of the B-pipe just ahead of the cat. There's a special socket usually available in auto parts stores that's cut out on one side to clear the wires -- makes the job much easier.

The knock sensor is nothing more than a small microphone to the sound of detonation. All it does is pass a signal to the ECU to retard the timing if it detects knock. So long as you're running premium fuel (or making it with with an octane booster, as you are), you shouldn't have a problem with knock on a stock engine, though. Especially if it's running a little rich to begin with. You may find the CEL goes away once you replace the O2 sensor -- sometimes there are odd dependencies in the fault circuits. If not, the knock sensor is on the back of the block, just below the head gasket. I've never had to replace mine -- it looks like a PIA to get a wrench on, but straightforward.
__________________
Jamie
'92 Prelude Si, '01 Miata, '63 Suburban
Caretaker of Alpina B10 3.5 #92
35 years continuous years with Preludes
Speed Demon Racing
Jamie on LinkedIn
Reply With Quote
  #3 (permalink)  
Old 08-25-2010, 09:17 AM
My97Prelude's Avatar
Platinum Member
 
Join Date: Jun 2008
Location: Kansas
Posts: 1,054
iTrader: (6)
My97Prelude has a reputation beyond reputeMy97Prelude has a reputation beyond reputeMy97Prelude has a reputation beyond reputeMy97Prelude has a reputation beyond reputeMy97Prelude has a reputation beyond reputeMy97Prelude has a reputation beyond reputeMy97Prelude has a reputation beyond reputeMy97Prelude has a reputation beyond reputeMy97Prelude has a reputation beyond reputeMy97Prelude has a reputation beyond reputeMy97Prelude has a reputation beyond repute
Re: Driving with Sensor "Issues"

Also on another note, you don't need a special socket to get the o2 sensor out if you are trying to save money, just get an open ended wrench, i think it is a 17mm or something close, and a little bit of force, they are not put on too tight.
__________________
Reply With Quote
  #4 (permalink)  
Old 08-25-2010, 12:15 PM
LilMsPrelude's Avatar
Platinum Member

 
Join Date: Jun 2008
Location: Boise, Id.
Posts: 2,294
iTrader: (4)
LilMsPrelude has a reputation beyond reputeLilMsPrelude has a reputation beyond reputeLilMsPrelude has a reputation beyond reputeLilMsPrelude has a reputation beyond reputeLilMsPrelude has a reputation beyond reputeLilMsPrelude has a reputation beyond reputeLilMsPrelude has a reputation beyond reputeLilMsPrelude has a reputation beyond reputeLilMsPrelude has a reputation beyond reputeLilMsPrelude has a reputation beyond reputeLilMsPrelude has a reputation beyond repute
Re: Driving with Sensor "Issues"

Thanks for the replies....
__________________
Quote:
Originally Posted by shatterbox View Post
People say the biggest difference you can change to your system is to add a subwoofer. Which is true, it is the most noticable difference. But running an amplifier to a good set of speakers makes the BEST difference.

_____________________
Understanding The Basics - Electronics & Car Audio
An In Depth Look At Relays
The "Big Three" DIY Install
Alarm & Remote Start DIY
My Babies Thread
Reply With Quote
  #5 (permalink)  
Old 09-09-2010, 05:47 PM
Junior Member
 
Join Date: May 2010
Posts: 79
iTrader: (0)
anonymous_lude is on a distinguished road
Re: Driving with Sensor "Issues"

Quote:
Originally Posted by Jamie View Post
Yes, you'll be fine. When the O2 sensor fails, the ECU defaults to a slightly rich mixture to insure the engine doesn't lean out at speed, which is why your mileage may go down. Not a big deal unless you're coming up on an emissions test (which I don't think they do in ID?). The O2 sensor's not difficult to replace, especially if you have access to a lift. It sticks out of the B-pipe just ahead of the cat. There's a special socket usually available in auto parts stores that's cut out on one side to clear the wires -- makes the job much easier.

The knock sensor is nothing more than a small microphone to the sound of detonation. All it does is pass a signal to the ECU to retard the timing if it detects knock. So long as you're running premium fuel (or making it with with an octane booster, as you are), you shouldn't have a problem with knock on a stock engine, though. Especially if it's running a little rich to begin with. You may find the CEL goes away once you replace the O2 sensor -- sometimes there are odd dependencies in the fault circuits. If not, the knock sensor is on the back of the block, just below the head gasket. I've never had to replace mine -- it looks like a PIA to get a wrench on, but straightforward.
i think im having the issue of the ECU defaulting to a slightly rich mixture.
i recently had to change the ECU due to a bad No 1 cylinder position sensor.
the day i got it back i took it to get tested and i failed the NOx(ppm) at low speed category by only 200 points.
that was about 2 weeks ago and ive since been running 93 octane gasoline.
i changed my fuel filter and pvc valve. my egr is clean. my cat converter is almost new. i put some lucas fuel system cleaner thats supposed to reduce NOx emissions and eliminate knocking
my CEL is on for a knock sensor. but i again i think thats because of the ECU issue running rich and all
do you think i will pass?
thanks.
and i dont mean to thread jack by any means. i jus dont want to start a whole new thread if i could find something helpful.
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
New here/1991 Si "Issues" oneamongthefence 3rd Gen Honda Prelude 11 06-06-2010 04:21 AM
Painted those 5th gen gauge rings, "Deep Dish" Style afesposi 5th Gen Honda Prelude 39 02-11-2010 12:47 AM
Found My "lost" Memory Card w/ Pics From The CT Meet on 3/15/09 98BB6SH Auto Showoff 22 07-02-2009 07:05 PM


All times are GMT -4. The time now is 05:02 PM.



Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
LinkBacks Enabled by vBSEO 3.6.0 PL2 © 2011, Crawlability, Inc.
vB.Sponsors


Copyright © 2006-2009 PreludeZone.com All Rights Reserved.