High idle after new MAF

[Chriskaw7r]

Hi I need help I just istalled a Lingftr 100 Maf 90mm TB from tpis and a fast 92mm intake. I changed the maf table to what lingenfelter said. I have an extremly high idle. I m guessing it's a running airflow table that needs adj. Any ideas or help would be great.It idles at 2500 then trys to stall. Then gos back to 2500. Should I just set b4349 to .0190

[Chriskaw7r]

ok changed B4349 to .019 but it still runs rough and now I have tcs codes 1278, 1255. REP and the idle is still not right. Anybody?

[joecar]

Chris, post your tune/log files... someone will have the answer...

[Chriskaw7r]

Chris, post your tune/log files... someone will have the answer...

Ok here it is....97 Vette Supercharged, heads cam, headers, water injection.

[odd boy]

Did u check the AFR? Because changing the MAF function only will change the AFR...... my point of view

[Chriskaw7r]

Did u check the AFR? Because changing the MAF function only will change the AFR...... my point of view

What do you mean by AFR? The Airfuel ratio is my guess.

[odd boy]

yes

[Chriskaw7r]

yes

So you say the IFR table is something I should look at?

[odd boy]

Brother, what other changes did u make from the stock file?

I didn't say IFR, do u have a wide band to check the AFR?

I would suggest that u post the stock file with the tuned one to see what changes took place

[Chriskaw7r]

Brother, what other changes did u make from the stock file?

I didn't say IFR, do u have a wide band to check the AFR?

I would suggest that u post the stock file with the tuned one to see what changes took place

Yeah like I said the car ran fine before the Fast 92, Lingenfelter 100mm, TPIS 90mm TB, the AFR was fine before this and yes I do have Wideband. My issue is idle. I have to get the base tune down with the idle first. Then I will work the AFR and drivabilty next. These where all changes that were done and ran great before: It is Supercharged and it has a cam and 44 lbs injectors, 3.42 gears, Rev limit changes so to list what is all different is about everything. Like I said it ran great before. I just need to know how to bring the idle down I think its airflow related. Tables I have changed are IAC park to 145, MAF to lingenfelters settings, Effective area on the TB to .019. Anything Im missing?

[joecar]

You changed intake manifold, throttle body, MAF...?

you will have to remap both of these:
- B5001 MAF table
- B0101 VE table

you will have to remap those before you play with idle.

Which wideband do you have...?

Do you have FlashScan V1 or V2...?

What car do you have and what other mods...?

Also, see these links:
showthread.php?t=13152 (http://forum.efilive.com/showthread.php?t=13152)
showthread.php?t=7866 (http://forum.efilive.com/showthread.php?t=7866)
showthread.php?t=4661 (http://forum.efilive.com/showthread.php?t=4661)
showthread.php?t=7867 (http://forum.efilive.com/showthread.php?t=7867)

[limited cv8r]

What is your TPS% and IAC count at idle? If TPS% is above {B5916} Base Spark Closed Throttle Threshold you will move to {B5913} Spark High-Octane Table instead of {B5932}Base spark in gear or {B5933}Base spark in park/neutral which can cause a high idle, also if your throttle is out of adjustment you may be letting excess air past the throttle blade causing high idle, IAC count at idle from memory should be somewhere around 60-80.

[Chriskaw7r]

You changed intake manifold, throttle body, MAF...?

you will have to remap both of these:
- B5001 MAF table
- B0101 VE table

you will have to remap those before you play with idle.

Which wideband do you have...?

Do you have FlashScan V1 or V2...?

What car do you have and what other mods...?

Also, see these links:
showthread.php?t=13152 (http://forum.efilive.com/showthread.php?t=13152)
showthread.php?t=7866 (http://forum.efilive.com/showthread.php?t=7866)
showthread.php?t=4661 (http://forum.efilive.com/showthread.php?t=4661)
showthread.php?t=7867 (http://forum.efilive.com/showthread.php?t=7867)

Thanks I will defiantly be working with these. I have a Zetronix widband with map and logging and EFI V1.

Thanks again!

[Chriskaw7r]

I m starting to understand the problem with my thinking now. I have always tuned in LS1 Edit. Reading what I have so far brings a point between Edit and EFI. They seem to be labeled the same for tables or functions but how they interface in function are different. I can see why EFI is better then edit. That being said I will have to learn EFI and try and forget Edit!

[joecar]

Do you have the Zeitronix Zt-2...?

On the Zeitronix website it says: "Linear AFR=Vx2+9.6"...

We'll have to insert that equation into a calculated pid, this will allow EFILive scantool to display the AFR...

in EFILive you can create a map/histogram of the correction factor, filter out transients, and apply this to VE or MAF tables.

[Chriskaw7r]

Yes all three!
V1.2


You changed intake manifold, throttle body, MAF...?

you will have to remap both of these:
- B5001 MAF table
- B0101 VE table

you will have to remap those before you play with idle.

Which wideband do you have...?

Do you have FlashScan V1 or V2...?

What car do you have and what other mods...?

Also, see these links:
showthread.php?t=13152 (http://forum.efilive.com/showthread.php?t=13152)
showthread.php?t=7866 (http://forum.efilive.com/showthread.php?t=7866)
showthread.php?t=4661 (http://forum.efilive.com/showthread.php?t=4661)
showthread.php?t=7867 (http://forum.efilive.com/showthread.php?t=7867)

[Chriskaw7r]

Chris, post your tune/log files... someone will have the answer...
Ok here they are! Frame 155 on the log is about where you will see I attempted a start and the RPM's went to 2134 then I shut it down. More info I cant seem to change the IAC Park position B4401 from 165. I saved it at 80 then loaded to the car. Then I tried to data log and it shows 165 in the park position. What am I missing?

[limited cv8r]

Why is your TPS at 12 % ?

[Chriskaw7r]

Why is your TPS at 12 % ?

I dont know what should it be?

[limited cv8r]

I'm assuming 97 vette is cable throttle,so TPS% at start up and idle should be 0.0% to 0.4%. You may need to adjust your throttle blade and do a TPS reset.Then adjust throttle to achieve correct/desired IAC count.

[joecar]

+1.

Your log file shows your TP stuck between 11.4% and 12.2%... fix this before proceeding.

[limited cv8r]

Try disconnecting your throttle cable from the throttle body and see if your TPS reduces, maybe just a tight cable with all the new hardware you have fitted, If not adjust the throttle blade as suggested.

[Chriskaw7r]

Try disconnecting your throttle cable from the throttle body and see if your TPS reduces, maybe just a tight cable with all the new hardware you have fitted, If not adjust the throttle blade as suggested.

Its a ETC car being a 97 Vette. Is the Tb motor at fault or is it the TPS rigging. The TB is a TPIS 90mm they took my stock TB as a core and installed the TPS, motor gears and motor on the new housing. Looks like we are narrowing it down! I will get into the TPS & TB as soon as I can. Do you think the TB is being commanded to this position from the IAC Park position?

[Chriskaw7r]

+1.

Your log file shows your TP stuck between 11.4% and 12.2%... fix this before proceeding.

Update the TP reads 12% as its commanded to by ETC desired throttle position of 12%. It also indicates the same at 12%. Further tests show the ETC will command the throttle blade to 100%. This is with the car not running. The only thing I dont understand is that the TPS PID data shows the TPS is not moving. It just stays at 1.3 volts as I vary the throttle blade with either by hand or with the gas pedal. Shouldnt the range be 0-4.7 V ? And it should vary with movement (which it does not).

[limited cv8r]

Could you make another log file with these pids(attached zip file)and post it up.Let the car run for as long as your game, the more info in the log the better.
Comparing your tune to a stock one there are some differences in some airflow tables.
Have you tried something simple,like your original maf table for example to see if that changes anything.

[Chriskaw7r]

Do you have the Zeitronix Zt-2...?

On the Zeitronix website it says: "Linear AFR=Vx2+9.6"...

We'll have to insert that equation into a calculated pid, this will allow EFILive scantool to display the AFR...

in EFILive you can create a map/histogram of the correction factor, filter out transients, and apply this to VE or MAF tables.


How do I do this? I have my wideband ready how do I insert this equation into a calculated PID?

[mr.prick]

(Volts*2)+9.6= manufacturers definition of stoich AFR
This contradicts the AFR & voltage range in the instructions. :confused:

It should be (Volts*2)+9.5 and that equates to 14.7AFR stoich.
How to match wideband output to {B3601} (http://forum.efilive.com/showthread.php?t=13229)

You need to write the expression into the calc_pids.txt

[Chriskaw7r]

(Volts*2)+9.6= manufacturers definition of stoich AFR
This contradicts the AFR & voltage range in the instructions. :confused:

It should be (Volts*2)+9.5 and that equates to 14.7AFR stoich.
How to match wideband output to {B3601} (http://forum.efilive.com/showthread.php?t=13229)

You need to write the expression into the calc_pids.txt

How do I get to the calc_pids.txt

[mr.prick]

C:\Documents and Settings\Administrator\My Documents\EFILive\V7.5\User Configuration
How to create an extra external PID (linear WBO2 example) (http://forum.efilive.com/showthread.php?t=132&highlight=linear+wbo2)

[Chriskaw7r]

C:\Documents and Settings\Administrator\My Documents\EFILive\V7.5\User Configuration
How to create an extra external PID (linear WBO2 example) (http://forum.efilive.com/showthread.php?t=132&highlight=linear+wbo2)

Thanks Mr Prick
Im not sure I have my equation right the EXT voltage is reading 2.5V or so and varying but the AFR does not change off 13.3 AFR in the scanner. Can somebody post the proper way to write it on note pad. I swear I have done it right but I must of missed it.

[joecar]

Chris, post you calc_pids.txt here, someone will fix it.

[Chriskaw7r]

Ok I m almost there. I have only a small problem with the A/C causing airflows to go so high that it causes the car into cruise control when I turn it on. It will raise the idle and cruise on the highway at 65mph. And the last is stalling after warm up at low idle, like at a stop light. Obviously these both seem to be airflow. Looking at the tables I think B4307 Desired airflow should be raised. After 80C I have 10 Gm/sec in gear and 11.2 park. I believe the increase in TB (TPIS 90MM) has changed the airflows for both of these problems. The A/C problem I m looking at B4356 A/C torque loss but I m not sure if it will help. Any comments on what I have stated?

[Chriskaw7r]

I can't get my wideband to work with the scanner.

[Taz]

Hello Chris,

I know you must be well beyond frustrated at this point. Eliminating variables one at a time will help. As per Joecar's request in post #31, please post your current calc_pids.txt file. Then Forum members will be able to assist you with getting your WBO communicating with your V1 / Scan Tool.


Regards,
Taz