Hondata

Hmmm.... That's a good question. Recheck the wiring and installation of the IACV again. Like I said run it in open loop and then re-post.

crucian,
I ran the car on open loop this evening and all was well. But when I switched to closed loop again, the same problem happened!

Now I know why you ...

Drive the car in "open loop" and then see if it happens. Right now it's in "closed loop".

crucian,
I will try. I suspect it is some mechanical parts that have gone haywire.

This afternoon, when I throttled, the rpm dropped normally but became stucked at a lean cell. The wideband afr showed ...

I would need your tune sent to me to see what was done to it.

crucian,
Here is the map the car is on. This evening when driving off, the sudden "lean" problem happened again. Wideband AFR showed "---" and rpm suddenly dropped very low. Then suddenly jumped up to normal again. Strange...

Johnny_9 wrote:Did he used diaelectric grease - Shop manual recommends it. Never seen a machanic use it...

Johnny,
I have no idea what that grease is. Anyway, car is so far so good thanks to my mechanic's magic touch... :-)

crucian,
The behaviour of the car today is the worst so far! Pls see the datalog.

I contacted my mechanic who came to check on my car. He popped the bonnet and touched some sockets. Then he brought it for a spin.

Surprisingly, all the problems I stated earlier "disappeared". He suspected it was ...

Crucian and all,
Here is the datalog using the original map. It was tuned very well for several months but somehow the map has "run" after the idle valve was cleaned.

I have a wideband sensor in the car. I notice that at certain low load and rpm, the afr at certain cells showed 10+ to 12+ which is ...

Crucian,
Today, I changed the overall fuel trim to "0" and throttle tip-in also to "0". Results were worse.

So, I revert to the original map. Instead, I increased the fuel map by three "clicks" and drove the car. It seems to be better. I will try again tomorrow.

I will also datalog and post it ...

Yes. If you have not already started tuning everything, set your overall fuel trim back to 0% and then tune. If it was tuned that way, leave it alone.[/quote]

crucian,
Sometimes, I can feel the car "jerk" (as in car hesitated) when i throttle in or lift off throttle.

Maybe the map is too lean and ...

All,
In "Fuel Trim" tab, if "Overall fuel trim" shows "-10%" and "Throttle tip in trim" shows "-30%", what does this mean?

Does it mean the fuel in these two fields will be LOWERED BY 10% and 30% respectively compared to the main fuel map?

thething96 wrote:post brand and size of injectors too..........

Injectors are stock at 240cc.

fly_n wrote:u really should post datalog & list any mods to motor or is it stock?

It is B18C with Crower Stage 2 cams and aftermarket valves/springs and CP pistons. The rest are stock.

I will post datalog later.

15-15.5 is not "quite lean" at idle speeds.
That should be fine, actually, unless you're running some insane comp and timing that's making you knock when only that lean.

Every car runs a little higher idle when running AC.
If the 15 AFR is really bugging you, modify the cells at the RPM and load ...

All,
This is the map.

OSracer,
I read that instruction too.

The problem I have is that I cannot adjust the idling too low. The idling AFR at the current high rpm is quite lean at 15-15.5.

To adjust it lower means I have to lean the cells further so rpm will drop.

Is there another way to lower the rpm to 850 safely?

Hi,
I have a B18C engine transplanted to my EG6 (2-door Civic).

The warmed-up idling rpm with aircon off is high at 1,400-1,500. Even if I move the IAC slider to the extreme left, the rpm is still high at that range.

When air con is off, rpm drops to ~900.

I tried playing with the cells in the ...