my igniton system sucks.. part2

[chriso]

timing is 10 BTDC.. i'm not even going crazy with the PRO settings. i'm only pulling like -10% fuel.

this is a new problem and it really started happening when i started messing with the software for the maft-pro.. i'm not blaming the unit; however i do need to realize that the unit may have something to do with my driveabilty issues

My issue EXACTLY ! Ever since I installed the Pro I've noticed misfiring at idle. I don't really notice it at highway speeds but that is because I haven't been driving it lately due to the problems with my Pro settings. I removed my NGK Iridiums due to a suggestion of a very knowledgeable forum member and installed the Autolite 3923's gapped at .028", this did not change anything. My engine was running perfectly smooth prior to the Pro install. I hope this thread gets to the point since we are in the same boat Mike. Tomorrow, I am planning on unplugging my Pro and reinstalling my Lex AFM to see if that cures my issue.

 

[malloynx]

hey chris... let me know how that goes.. i'm trying all i can to get this figured out.

 

[Allan_MA70]

standalone ecu FTW

 

[bfr1992t]

make sure i understand this correctly. the wb02 was 2" from the v-band and gave false lean conditions and didnt heat up enough? then you moved to 6" away and now it stays at the correct temp and reads 2 points different?

The sensor was getting TOO hot. Maybe too much pressure or too turbulent of air. This is with an NTK sensor.

 

[chriso]

I unplugged all the Pro stuff and put back my Lex AFM. Still missing at idle. Next I installed NGK 6097 plugs gapped at .030". Car runs fine now. My timing was off somehow at 14BTDC. I re-timed it to 10BTDC and had to raise the idle a little bit. Now she seems to be running a lot smoother. I guess my next step is to replug all the Pro stuff back and see where I am at.

On a side note, before today. My car seemed to be running alright when cold. After it got to temperature is when it started to miss. I was reading a thread on this on SF but there was no solution there.

 

[malloynx]

i have the same issue... when the car is cold... great idle; as she warms-up. i get a slight misfire and a choppy idle..

where is your IAT sensor mounted?

 

[tookwik4u89]

Where is your a/f at for idle guys, mine does same, can feel a miss every 1-2 secs, think the idle needs fattened up a little. I regapped my plugs malloy, and runs good at 22psi.

 

[tookwik4u89]

And I cant get an answer anywhere to get my datalog working, I hope new t-pro software comes SOON.....argh!

 

[dbsupra90]

And I cant get an answer anywhere to get my datalog working, I hope new t-pro software comes SOON.....argh!

from ftst, maybe this will help?

in the aldl/logging setup screen, you need to select an ADS file (tpro4400.ads) in the datastreams directory/folder. Use the browse button and navigate to find it. Do not edit it.

Then use the select logfile button on that same screen to tell tunerpro what file to save the log to. It looks like an open file screen, just put a new filename in the box and click Open, then confirm when tunerpro asks if you want to make a new file.

Then the double arrow button at the top of the screen should connect to the ECU, the M button turns on the logging traces. Right click on a trace to select what data you want displayed on that trace. the D button is a numerical "dashboard". the Red circle button is for recording, the black square is to stop recording.

and, a video even. http://www.bailey-eng.com/instructional/recording.avi

 

[chriso]

i have the same issue... when the car is cold... great idle; as she warms-up. i get a slight misfire and a choppy idle..

where is your IAT sensor mounted?

3000 pipe, same as yours. Do you think that may have something to do with it.

 

[tookwik4u89]

Thanks Db....got it straightened out, had to make a new file. Worked before I updted to 4.63, somehow I changed something.

 

[3p141592654]

Reading through there seems to be two issue: a) idles rough when hot b) missing under peak load

a) Idle good when cold, rough when warm.
-> idle A/F is much leaner hot when the system is closed loop, therefore could your problems not be fuel related rather than ignition related ?

b) missing under peak load
-> plug firing voltage is highest under peak load. I would triple check ignition wiring routing for possible crossfire or arcing to ground. I know you said you got 30kV from the tester, but that was probably at idle and testing only one plug? Try testing them all. If you're on a dyno turn off the lights and look for sparks.

 

[malloynx]

well, i reinstalled 4.65 and i'm running 1.6 bar with no ignition break-up.. i hope there was just a software glitch..

also i got the new 4.76 software last night from bob

 

[tookwik4u89]

well, i reinstalled 4.65 and i'm running 1.6 bar with no ignition break-up.. i hope there was just a software glitch..

also i got the new 4.76 software last night from bob

Whats in the new version?

 

[chriso]

well, i reinstalled 4.65 and i'm running 1.6 bar with no ignition break-up.. i hope there was just a software glitch..

also i got the new 4.76 software last night from bob

I rebooted my Pro unit (holding down the right two buttons for 10 seconds during startup) and then downloaded my bin file again. I have less of a hesitation from idle and no noticable missing right now.

Version 4.76, is this MAFT Pro XP???? hmmmm care to share???

Oh and btw, tookwik, that is one hell of a killer looking car you have in your sig !!!

 

[tookwik4u89]

:biggrinbo Thanx chris!