Who replaced his LAF sensor (O2 sensor, Civic Vx)?

[GasSavers_TomO]

Originally Posted by VEI

Yes I have cleaned the EGR.

That is good that you have cleaned the EGR, now have you cleaned the EGR ports?

Originally Posted by VEI

I have checked this. It’s good.

That looks like it's the 12° timing mark (lights up when using a timing light to check timing) What does the timing look like when you check the TDC (Top Dead Center) mark against the TDC mark on the cam gear?

[VEI]

Originally Posted by TomO

That is good that you have cleaned the EGR, now have you cleaned the EGR ports?

No, it seemed clean.
And I have the same problem when EGR is DISCONNECTED !

Originally Posted by TomO

That looks like it's the 12? timing mark (lights up when using a timing light to check timing) What does the timing look like when you check the TDC (Top Dead Center) mark against the TDC mark on the cam gear?

I don't understand your question.
Red mark = 16?
Black mark = TDC (0?), first cylinder.

[GasSavers_TomO]

^^^ok, there are two different things to check when you "check timing".

TDC is the black mark....when that mark is in the pointer, is the TDC mark on the Camshaft pulley at the TDC mark on the inside of the upper timing belt cover?


The other way of checking timing is to have the car running and see what the ignition timing is set at. That is when you use a timing light and look at the pulley to see where the timing mark is at. Like the picture you posted.

I hope that makes sense to you. Let me know if it doesn't.

How did you check the EGR ports? Did you remove the EGR plugs in the intake manifold and check?

[1993CivicVX]

Originally Posted by VEI

I know your opinion. But I would have several answers, several opinion before make a choice.

Ok, you have not this problem with your new sensor, but sometimes, you have the CEL. Your AFR is perhaps a litle diff?rent, more rich. I don't know.

It's difficult for me to explain my problem.
With the new exhaust manifold (no cat.), the accelerator response is different. The "response delay" is more "brutal".
But before, with d15z1 exhaust, I think I already had a "response delay" and some hesitations in lean burn. (More that when I bought the car).

Maybe I am crazy. It is possible that this is normal. I don't know.

I don't think it is possible it is normal. I think no one has replied to that comment because I think the opinion of everyone else is also that it is not normal. It's wishful thinking my friend in lieu of a $320 fix to your problem. Granted I don't know much about cars, but the little I've picked up about my car on this forum leads me to believe there is little other recourse for you in the matter of your stumble/power lag/power surge issues upon acceleration. I can also say that with my car the problem was worse the lower the RPM, which seems to be true for you as well (at 3900RPM you said the problem was not present) I did have the same problem as you. And through the same advice the people here are giving you, I applied to my own car and the problem was fixed. If you search through the forums you'll find other VX owners who had similar problems fixed by replacing their old o2 sensors. o2 sensors do not always throw a CEL when they are not performing at their best and could use replacing. My car was not giving me a CEL when I replaced the o2 sensor, and yet the o2 sensor was the main culprit to the problem. You may want to try www.honda-tech.com to see if you can elicit a different opinion over there, tho.

The replacement of the o2 sensor had the largest positive effect for my car. The right spark plugs also had a big effect for improving the stumble problem. And I think the other things mentioned can't hurt and may help with that specific problem. Anyway, if I come across a little brusque, I don't mean to be rude (look at my title, I sometimes have a hard time being polite) I am trying to help you. Or at least save you some time.

One more thing: it seems that the life span of the o2 sensors is around 170,000 miles, give or take a few 10k. Your car has around 165,000? Basically, there is no indication that your o2 sensor might be fine, and lots of indication that it needs replacing. Namely the CEL, the bad stumble/power lag/surge and the fact that nothing else you have tried has fixed the problem. Anyway, I suppose you can't be too certain about something when it's as expensive as the o2 sensor to fix.

[VEI]

Originally Posted by TomO

^^^ok, there are two different things to check when you "check timing".

TDC is the black mark....when that mark is in the pointer, is the TDC mark on the Camshaft pulley at the TDC mark on the inside of the upper timing belt cover?

The other way of checking timing is to have the car running and see what the ignition timing is set at. That is when you use a timing light and look at the pulley to see where the timing mark is at. Like the picture you posted.

I hope that makes sense to you. Let me know if it doesn't.

Ok, now I understand what is ?timing?. The word is completely different in French
I was thinking about ignition.

Yes, the marks are correct and I have checked my ignition timing (my picture).

But I must replace my timing belt (normally next month).

Originally Posted by TomO

How did you check the EGR ports? Did you remove the EGR plugs in the intake manifold and check?

I have checked under the EGR valve and no carbon.
But, I have the same problem (lag) when the EGR valve is disconnected. So, I think that EGR is good.

[Sigifrith]

Originally Posted by Matt Timion

I just replaced mine, but don't have a baseline for mileage. Hell, I don't even know when I enter lean burn... Would be nice if a lean burn light came built in.

Or if some smart member could design a circuit to turn on an idiot light when in lean burn.

[dogncatboy]

Originally Posted by Sigifrith

Or if some smart member could design a circuit to turn on an idiot light when in lean burn.

This idiot would buy one!

[GasSavers_TomO]

Originally Posted by Sigifrith

Or if some smart member could design a circuit to turn on an idiot light when in lean burn.

I'm working on it soon, it's on my list of things.

[Danronian]

Originally Posted by Sigifrith

Or if some smart member could design a circuit to turn on an idiot light when in lean burn.

That would be nice.

[1993CivicVX]

That would be pretty sweet TomO. I'm assuming at this point that I'm in lean burn whenever the pedal is feather footed, and I'm out of lean burn when I feel that little power kick and the throttle won't give more power.