it's a stock 95 integra with exhaust (apexi gt spec) only

i recently changed the spark plugs. and the old one looks normal. im getting about 20 miles per gallon.

any ideas?

 

how do you know your running rich?

have you checked the o2 sensor lately?

 

I could smell it out of my exhaust, n i calculate my mpg, and it's only about 20 or 21 mpg. i dont have a cel either

 

well odds are your o2 sensor is starting to go stale, especially if youve got over 100-120k miles and its never been replaced.

or if youve got an oscillisope, you can actually TEST the sensor, but those cost about 2g's...

 

anyone have any other ideas?

 

omg we have the same problem but on mine i could even it from the inside..

we need some very good info on this

ill take some pic of my meter to prove it you..

 

yes please put more input in please, any ideas would be great

*stock ls motor
*apexi gt spec exhaust
*130k miles
*recently changed spark plugs to help with problem but still no good

 

does your car run all funky in crap....like it'll cut off and then jump once in awhile...my built gsr does that...im not sure if my o2sensor is bad...i have no cel either...plus i dont even think i get 20 mpg...its a beotch at times...half the times it'll drive fine..and then do what i staterd above....

 

yes sometimes the car does feel a bit funny. sometimes i could feel the car doesnt have any low end (under 3k) but after 3k, it feels great.

 

same here

 

Chances are, if you ONLY have exhaust.. your gonna run a TAD rich. But nothing to what your saying. I'd say your cat is either failing, or your 02 is about to go.

 

same here...sometimes it feels like a slug....im going to replace my secondary o2 sensor....and try to eliminate things out.....

 

UMMM what do you mean secondary O2. you only have one O2 sensor. Now your cat will not cause your car to run rich,cause you )2 sensor if pre-cat. it might be clogged. If your O2 sensor was going bad it should throw a DTC usually a 400 code. your O2 should read 0.7-1.0 volts in a rich condition and 0.0-0.3 volts in a lean condition. you could check the resistance check on it with a multimeter. you should have about 10-40 Ohms between terminals 3 and 4. Or you could have a bad MAP sensor. At low vacuum, no throttle, you should have about 2.5volts and at high vacuum, you should have about .5 volts. you can do this with a multimeter by back probing the connectors.

 

obd2 cars have 2 o2 sensors right?

 

yeah OBD2 didnt come around till 96. Plus dude I am an acura tech at the dealership in Columbia.

 

yeah.. secondary o2 sensor is not gonna change the performance of your car, it only tells the computer that the cat is working or not. your primary o2 sensor on the other hand can kill your mileage. a cat also shouldnt effect performance unless its completley clogged.

and yeah, everything H22powered_94teg said is correct. and i didnt know you could check the o2 for resistance, i just learned the oscilliscope.

 

exactly...i am obd2....i know my car

 

my 94 sol has a 96 ls b18 and i am having the same problems.. with my a/f ratio gauge i can tell it runs really rich at idle and then falls totally on its face when crusing around a parking lot somerimes..... i have an apexi super afc but know nothing about it yet..

the motor is mildly built with an obx intake manifold and throttle body

 

one thing ive heard of is if your AFR gauge is directly on the wire to the o2 sensor is you can effect the signal to the computer.

 

would the ecu make a difference with this kind of issue?

 

Well I have had both the Apex'i Super AFC and the V-AFC and a a/f gauge. As far as the Apex'i goes if you are adjusting the A/F you are either shortening or lengthening your injector pulse width. Basicly how long the pintle comes off its seat, allowing less or more fuel in. So negative sign mean leaning in out and the positive numbers enrichen. It has been a while since I have messed around with the AFC and all since I got the Hondata s300.

But as far as the ls swap in the del sol, hmmm, what all did you change out in the swap everthing I am assuming. your car should run a little rich on start up till the O2 sensors cycle from closed loop to open loop. as far as it falling on its face just cruising around a parking lot. How are your plug wires, check them they might be cracked. what else does it do?

 

still running rich....need help

 

do a full tune up and see what happens. dont forget your 02 sensor and pcv valve.

 

im on obd1 ecu...so i dont need the secondary 02...im going to redo my timing see if it helps any.....it looks off with the timing gun so ima give it a try

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mouab18c1 &raquo;</TD></TR><TR><TD CLASS="quote">exactly...i am obd2....i know my car </TD></TR></TABLE>
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mouab18c1 &raquo;</TD></TR><TR><TD CLASS="quote">im on obd1 ecu...so i dont need the secondary 02...im going to redo my timing see if it helps any.....it looks off with the timing gun so ima give it a try</TD></TR></TABLE>


So which is it, do you have an OBD1 or do you have an OBD2? Or are you saying that you have an OBD2 car and are running an OBD 1 ECU? But how will the timing affect your A/F? I don't think it will.. You need to figure what your stoichiometric ratio if you think that your are running rich.


Modified by H22powered_94teg at 11:32 AM 4/15/2008