Go Back   Team-BHP > Under the Hood > Technical Stuff


Reply
 
Thread Tools Search this Thread
Old 12th April 2007, 18:54   #1
BHPian
 
rohan_fonseca's Avatar
 
Join Date: Jan 2006
Location: Panaji
Posts: 984
Thanked: 4 Times
Default Dumb question about sensors....but i gotta know

Have k&n & free flow on a zen. What would be the effect of disconnecting the
i. Oxygen sensor in the exhaust manifold
ii. AIT sensor
iii. TB position sensor
iv. MAP sensor
rohan_fonseca is offline   Reply With Quote
Old 13th April 2007, 19:28   #2
Newbie
 
Join Date: Apr 2006
Location: Bloomsburg, Pennsylvania, USA
Posts: 20
Thanked: 0 Times
Default

In some cases, such as with the AIT and MAT (and sometimes o2) sensors, your car would probably just run in "limp" mode and you would get trouble codes and a check engine light. Performance would go down.

In others, such as the MAP, MAF, TPS, and most likely o2 sensors, your car wouldn't be driveable, it would spit and sputter, possibly smoke, and you would have a mess on your hands.

You need all of these sensors for your car to operate properly. Many piggybacks modify MAF, MAT, IAT, and MAP signals to create power or fuel economy gains, but it is absolutely necessary for the ECU to get a reading from each of these sensors.

Some companies also make o2 sensor simulators...in case you have a bad o2 sensor, or you have altered your car in a way (exhaust mods, etc.), so that you have terrible emissions. The o2 simulator will send an immitated signal to your ECU showing it that everything is OK with the exhaust, when in reality, it is not.
nextlevel350z is offline   Reply With Quote
Old 13th April 2007, 22:35   #3
BHPian
 
rohan_fonseca's Avatar
 
Join Date: Jan 2006
Location: Panaji
Posts: 984
Thanked: 4 Times
Default

Actually posted that question because i had a weird situation. The oxygen sensor wire to the exhaust was cut( probably the wire was hanging close to the fan due to my negligence). Probably was that way for months. There was no drop in fuel economy or mileage. Also no engine warning light. Was wondering why. Have also seen an OHC with disconnected sensors(i.e. O2 sensor and IAT sensor). It is a well tuned car with no ECU upgrade!!! Is that possible?
rohan_fonseca is offline   Reply With Quote
Old 14th April 2007, 09:01   #4
BHPian
 
rdkarthik's Avatar
 
Join Date: Sep 2005
Location: bangalore
Posts: 206
Thanked: 11 Times
Default

O2-
It depends on what car you have. Euro 2 suzukis run perfectly fine without an 02 sensor, but the Euro3 version through an error. Most of the newer cars may have issues with drivability in closed-loop mode (everywhere but full throttle )

AIT/IAT - Almost all cars run fine without this. Checklight will turn on. You can be sure you are not getting the best fuel mixtures and ignition timing

ECT - Same as IAT, but usuakll causes high idle and switches on radiatior fan.

TB and MAP - You can still use the car with either of them working,at the cost of drivability. On most cars you will not have any significant drop in performance in full throttle conditions .
rdkarthik is offline   Reply With Quote
Old 14th April 2007, 09:02   #5
BHPian
 
rdkarthik's Avatar
 
Join Date: Sep 2005
Location: bangalore
Posts: 206
Thanked: 11 Times
Default

Quote:
Originally Posted by rohan_fonseca View Post
Have also seen an OHC with disconnected sensors(i.e. O2 sensor and IAT sensor). It is a well tuned car with no ECU upgrade!!! Is that possible?
I guess possible if disconnected, but not so if sensor is connected but screwed.
rdkarthik is offline   Reply With Quote
Old 16th April 2007, 15:41   #6
BHPian
 
rohan_fonseca's Avatar
 
Join Date: Jan 2006
Location: Panaji
Posts: 984
Thanked: 4 Times
Default

To satisfy my curiosity, disconnected the O2 & AIT sensors. Car ran ok but with a small drop in performance.....(as measured by my b-Dyno )
rohan_fonseca is offline   Reply With Quote
Old 19th April 2007, 03:38   #7
BHPian
 
chetanhanda's Avatar
 
Join Date: Mar 2005
Location: Toronto
Posts: 886
Thanked: 42 Times
Default

Quote:
Originally Posted by rohan_fonseca View Post
To satisfy my curiosity, disconnected the O2 & AIT sensors. Car ran ok but with a small drop in performance.....(as measured by my b-Dyno )
hahah you are an interesting RnD type of the guy ..
now try this out for me.. remove the TP sensor and measure the performance ..
chetanhanda is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Immobilizer - A dumb question Simhi Technical Stuff 32 14th August 2017 14:45
A man's gotta do what a man's gotta do : Night drive to Chikmagalur libranof1987 Travelogues 37 30th June 2011 20:43
Matiz : A dumb question on "reserve fuel lamp" kshastry Technical Stuff 25 15th January 2008 13:33
Another dumb question from a noob!! archat68 In-Car Entertainment 3 3rd January 2007 06:27
A dumb question milindbajekal The International Automotive Scene 8 10th September 2004 14:08


All times are GMT +5.5. The time now is 19:20.

Copyright 2000 - 2017, Team-BHP.com
Proudly powered by E2E Networks