H22a running lean, intermittent, calibration an log uploaded

mataos · Post by **mataos** » Sat May 15, 2010 4:27 am

Hi, My Prelude H22a has started running very lean but its not the calibration as its not all the time plus it was set up correctly when tuned. if I upload the same calibration again its fine for a while, seems to fix the problem and car runs correctly.

When its running correctly it idles file around 14.7AFR (950RPM), under load 13.5, crusing 14 - 15 ish and it runs and pulls well,

but then it changes;

when not correct it idles ok but 16-17AFR unless you bring the revs up a bit (1200), under load all over the place but mostly 16 -17 unless you drive very easy, light load you can keep the AFR to 14-15, crusing can be ok 14 - 15 ish but as soon as you give it more throttle it just goes lean 16-17 or off the gauge! and it has no torque and not nice to drive!

Obviously I am not driving it around when its running lean, I upload to it again and it solves the problem for a day or so!

Basic Set up;

Skunk2
stage 2 cams,
inlet manifold,
Valves, springs, retainers

Ported/flowed head
No balancer shaft
Greedy ex manifold, de-cat / racetech system
K&N induction

Any help or suggestions will be very much appreciated, car has been fine for years, no engine part changes to affect calibrations etc. so I cant see what its doing it.

I have attached my calibration, I can do a datalog if required!

Thanks,
Mat

Post by **Spunkster** » Mon May 17, 2010 12:38 pm

you need to post a datalog showing the problem as well as what wideband you are using and how you have it wired in.

mataos · Post by **mataos** » Fri Jul 16, 2010 11:58 am

Hi, sorry for the long delay in replying! Its not perfect but running better so have not looked in to it until now!

I have a AEM ueago but it is in open loop, so I now want to connect it up to the ecu, I have a P72 with a s300, am I correct in thinking that its as simple as connecting the white wire from the gauge to pin D14 on the ECU?

I have done a bit of research and most say D14, some say D10!

What RPM range will the ECU act on the info from the wideband?

Thanks,

Post by **Spunkster** » Fri Jul 16, 2010 12:16 pm

Installation is similar to the PLX

http://www.hondata.com/techplxwiring.html

mataos · Post by **mataos** » Sat Jul 17, 2010 10:05 am

So I should use pin D10 ELD? and not D14 O2?

or does it not matter as long as I select the correct input in smanager?

http://www.hondata.com/help/smanager/in ... ectors.htm

This shows pins are from left to right;
21,19,17,15
22,20,18,16

I am confused by this chart ;

http://www.phearable.net/tech/wiring/pinouts2.htm
shows that D14 on a P72 is O2 and D10 is ot listed! so i guess the chart is not correct?

and
http://www.ff-squad.com/technet/wiring.obd1.htm

and this shows pins are from left to right;
1,3,5,7,9
2,4,6,8,10

EDIT - now wired in ok.

mataos · Post by **mataos** » Sat Jul 17, 2010 11:27 am

EDIT - Now ok and wired in with ELD pin only going to white wideband input wire. (cut wire)

Thanks

mataos · Post by **mataos** » Sat Jul 17, 2010 1:10 pm

I have attached 2 calibrations, car was running ok and did not show the lean issue, but it still may be of some use! are my target lambda tables correct? can you see any problems?

I willtry to get a log of when it is not running correctly.

I get a o2 sensor error code when its in closed loop I expected it to be ok now I have the wideband connected to the ecu, I get a voltage reading for the wideband so its wired up ok! eld is disabled.
Do I need the stock o2 sensor connected as well as the wideband for closed loop to be ok? or can I just disable it (disable o2 heater in smanager) as I only have one sensor hole in my exhaust!

Thanks for your help!

mataos · Post by **mataos** » Mon Jul 19, 2010 10:27 am

I have attached my latest calibration, main changes are;

Closed loop, o2 sensor disabled, use wideband input for closed loop, voltage lambda conversion table corrected;
0.00 2.31 5.00
0.68 1.00 1.36

I have also attached a datalog that shows the running lean problem. it was fine when I uploaded it and went for a drive at lunchtime (air fuel ratio was good, lots of power), then in the evening it ran lean as this datalog shows, best seen at full throttle when on vtec tables, if someone can have a look it would be very much appreciated!

mataos · Post by **mataos** » Wed Jul 21, 2010 11:43 am

Update,
I have recorded a datalog every time I drive the car, only once did it run lean (see datalog in previous post) I cant see anything wrong with the calibration or the datalog, except for the lambda.

Could it be one of the sensors causing an intermittent problem? or something wrong with the fuel system? I have put a new fuel filter on it today as the one on the car was very old, will post another datalog if it runs lean again!

TTR · Post by **TTR** » Fri Jul 23, 2010 11:08 am

Your intake air temp tables are not scaled correctly, it is pulling fuel after 51 degrees of temp. I tried rescaling it for you but the program won't let me change the break points. You may have to start with a new map and import your settings. The scaler should end around 200 degrees not 100. And your stationary idle breakpoints should match your moving idle breakpoints. Moving idle speed should not be lower than the stationary speed.

mataos · Post by **mataos** » Sat Jul 24, 2010 1:37 am

Hi, Thanks for taking time to have a look, I have corrected the idle speed vs coolant but have some questions about the air temp tables, (air temperature compensation tables in the fuel compensation tab)

I cant change the values on either the stock H22A calibration or on mine (bit if mine were the same as stock then it would be ok?);

Stock H22a Calibration
-40 to 90
-10 to 1.3

My Calibration
-40 to 38 (100f)
-10 to 1.3

I have only showed values for the 1st of the 3 tables but do I need to just change the temp values in each and keep the same correction values? so I would have ;
-40 to 90 (200f ish) same as stock

Before I start with a new map and import my settings can anyone tell me if this can be changed? and could this be the cause of my intermittent lean running triggered when a certain temp is reached?

Thanks,

TTR · Post by **TTR** » Sat Jul 24, 2010 9:49 am

Select create new calibration and try using the ITR map. Import your setting into this map. You can edit both the breakpoints and values with that map. Leave the correction values alone and make corrections to the fuel map itself. You should also change the "rate of change" tables in the closed loop tab, try setting all the slow boxes to 5 and the rest to 99. This will help when in closed loop.