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Old 06-07-2010, 02:52 PM   #26
Phatron
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omg dude. this rom looks like ass.

stock maf housing and your MAF scaling is all jacked. jesus christ. this crap cracks me up.

give me a minute and i'll send you a new one
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Old 06-14-2010, 12:33 PM   #27
Daluv
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anybody who's looking for a great tuner should look for phatron!
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Old 06-14-2010, 02:19 PM   #28
Phatron
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thank you sir

Last edited by Phatron; 06-14-2010 at 02:27 PM.
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Old 07-12-2010, 02:40 PM   #29
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so taking a look at the shop manual in engine diagnostic on the subject of the rear oxygen sensor:




check idle?




so let's go for a SLOW ride and log the same exact data as the Engine diagnostics page.





so uhm let's try this again because I am stupid and clueless..




I unplugged the rear 02 to do a small test and went for a ride... almost all hesitation seems to be gone now.... let's see what the dealer will do...
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Old 07-12-2010, 02:43 PM   #30
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Went to the dealer, changed it under warranty. DOESNT SOLVE THE ISSUE.

Still have the same behavior when IDLING from the voltage of the BRAND NEW rear 02 sensor.

I really dont know what to do now

Mart

Quote:
Originally Posted by Daluv View Post
so taking a look at the shop manual in engine diagnostic on the subject of the rear oxygen sensor:




check idle?




so let's go for a SLOW ride and log the same exact data as the Engine diagnostics page.





so uhm let's try this again because I am stupid and clueless..




I unplugged the rear 02 to do a small test and went for a ride... almost all hesitation seems to be gone now.... let's see what the dealer will do...
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Old 07-12-2010, 04:09 PM   #31
bluescoobywagon
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Have you tried adjusting the Engine Load Compensation (MP) table? It almost sounds like you're fighting a resonance in the intake system. Try setting the RPM column to
Code:
700
900
1200
1600
2000
2400
2800
2900
3000
3100
3200
3400
and then do a bunch of logging in the problem areas and run them through the MRP spreadsheet. You may find that you have some easily tuned RPM corrections.
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Old 07-12-2010, 04:13 PM   #32
Daluv
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I think that the table is pretty much stock:




Mart

Quote:
Originally Posted by bluescoobywagon View Post
Have you tried adjusting the Engine Load Compensation (MP) table? It almost sounds like you're fighting a resonance in the intake system. Try setting the RPM column to
Code:
700
900
1200
1600
2000
2400
2800
2900
3000
3100
3200
3400
and then do a bunch of logging in the problem areas and run them through the MRP spreadsheet. You may find that you have some easily tuned RPM corrections.
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Old 07-13-2010, 12:31 AM   #33
NSFW
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I'd like to see a datalog of these parameters when the hestitation/bucking happens:

engine speed
MAF (g/s)
load (2-byte)
total ignition timing (not base, not advance, just total)
AFR (wideband if you have it, but stock is OK too)
throttle plate opening angle
boost (Manifold Relative Sea Level Pressure (Direct) (2-byte))
AF correction #1

...and no other parameters.

And I'll say up front that it's normal for AF correction to flutter a lot. I'm actually curious as to whether it maintains a high or low value during the stuttering.
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Old 07-13-2010, 09:32 AM   #34
Daluv
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I am currently logging for the MRP compensation.

I will after log that info for you.

thanx

Mart

Quote:
Originally Posted by NSFW View Post
I'd like to see a datalog of these parameters when the hestitation/bucking happens:

engine speed
MAF (g/s)
load (2-byte)
total ignition timing (not base, not advance, just total)
AFR (wideband if you have it, but stock is OK too)
throttle plate opening angle
boost (Manifold Relative Sea Level Pressure (Direct) (2-byte))
AF correction #1

...and no other parameters.

And I'll say up front that it's normal for AF correction to flutter a lot. I'm actually curious as to whether it maintains a high or low value during the stuttering.
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Old 07-13-2010, 08:46 PM   #35
Daluv
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Here is some log:

https://spreadsheets.google.com/ccc?...thkey=CPeK1bIJ

https://spreadsheets.google.com/ccc?...thkey=CPHFpeEG

https://spreadsheets.google.com/ccc?...thkey=CPjHuOYM

https://spreadsheets.google.com/ccc?...thkey=CJO_uvsJ

let me know what you think.

Mart

Quote:
Originally Posted by NSFW View Post
I'd like to see a datalog of these parameters when the hestitation/bucking happens:

engine speed
MAF (g/s)
load (2-byte)
total ignition timing (not base, not advance, just total)
AFR (wideband if you have it, but stock is OK too)
throttle plate opening angle
boost (Manifold Relative Sea Level Pressure (Direct) (2-byte))
AF correction #1

...and no other parameters.

And I'll say up front that it's normal for AF correction to flutter a lot. I'm actually curious as to whether it maintains a high or low value during the stuttering.
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Old 07-13-2010, 09:04 PM   #36
woodys77
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Subscribed... i have the same issue but i would call mine more of a hitch then a hesitation.
i have an aps bpv that i may try replacing cause i had it on two dif cars and both cars had the same issue.
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Old 07-14-2010, 01:42 AM   #37
NSFW
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05 Stage Free LGT
ATP 3076, 6MT, AVO FMIC

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I hate to say it, but I don't see anything interesting in those logs. When my car hesitates, it's because AFR is in the 16ish range. You've got pretty normal AFR, load, MAF, MAP, timing, etc.

The only thing I'd change is to make the maximum timing 38 degrees, but that's just to help with shift knock. I doubt it will affect the hesitation.

Have you tried logging the "roughness monitor" parameters? There's one for each cylinder. Normally they just sit at zero. If they count up, that might be a clue that you're getting misfires.
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Old 07-14-2010, 07:27 AM   #38
Daluv
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welll, there is no knock during the hesitation. I have monitored that using my own custom SSM display tool.

I am thinking that the granularity is too slow to clearly show the hesitation ...hence why I am working on changing the baud rate via a custom SSM command....
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Old 07-14-2010, 07:29 AM   #39
Daluv
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I have to say that only changing the RPM column made a difference on the hesitation. The car "feel" better at very low RPM (< 1500).

Maybe I should zero'd out that table...

anyway have experience with that MRP table and how to tune it? I am unable to use the spreadsheet. It is giving error every time I am trying to use "filter"...

thanx

Mart


Quote:
Originally Posted by bluescoobywagon View Post
Have you tried adjusting the Engine Load Compensation (MP) table? It almost sounds like you're fighting a resonance in the intake system. Try setting the RPM column to
Code:
700
900
1200
1600
2000
2400
2800
2900
3000
3100
3200
3400
and then do a bunch of logging in the problem areas and run them through the MRP spreadsheet. You may find that you have some easily tuned RPM corrections.
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Old 07-14-2010, 08:37 AM   #40
Daluv
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well I zero'd out the table and there is less hesitation. My educated guess would be that this table need to tuned... I dont know how.

Anybody knowing the inner working of that table is willing to help me out?

thanx

Mart

Quote:
Originally Posted by Daluv View Post
I have to say that only changing the RPM column made a difference on the hesitation. The car "feel" better at very low RPM (< 1500).

Maybe I should zero'd out that table...

anyway have experience with that MRP table and how to tune it? I am unable to use the spreadsheet. It is giving error every time I am trying to use "filter"...

thanx

Mart

Last edited by Daluv; 07-14-2010 at 11:32 AM.
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Old 07-14-2010, 11:22 AM   #41
Phatron
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i usually just zero that table.....guess i forgot too.

i didnt say i didnt know how to tune that.....i said i didnt know what the "MRP Spreadsheet" was that he was referring to.

but having said that.....i've never tuned that table.

but.....basically i couldnt tune it via the internet anyway.....

But its pretty simple.....you just need to isolate the rpm and loads where the hesitation is occuring....then increase/decrease the values in that area until the hesitation goes away.
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Old 07-14-2010, 11:44 AM   #42
Daluv
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MRP Spreadsheet can be found here:

http://www.romraider.com/forum/viewt...t=5483&start=0

Mart

Quote:
Originally Posted by Phatron View Post
i usually just zero that table.....guess i forgot too.

i didnt say i didnt know how to tune that.....i said i didnt know what the "MRP Spreadsheet" was that he was referring to.

but having said that.....i've never tuned that table.

but.....basically i couldnt tune it via the internet anyway.....

But its pretty simple.....you just need to isolate the rpm and loads where the hesitation is occuring....then increase/decrease the values in that area until the hesitation goes away.
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Old 07-14-2010, 12:56 PM   #43
bluescoobywagon
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Daluv, did you get my PM earlier?
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Old 07-14-2010, 01:01 PM   #44
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Yes. I will send you data tonight.

thanx a lot.

Mart

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Originally Posted by bluescoobywagon View Post
Daluv, did you get my PM earlier?
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Old 07-14-2010, 01:29 PM   #45
Phatron
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im really interested to see if you find anything.

the only thing i noticed in the hesitation logs was the AVCS bouncing around......but the mapping is smooth.

i thought the hesitation was around 3000rpm? So i wonder how zeroing out the Load Comp table helped the hesitation...since it only had values up to 1200rpm.

maybe you're just driving around at too low of an rpm. im never below 3000rpm......except in 1st gear.
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Old 07-14-2010, 01:34 PM   #46
Daluv
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zero'ing the table doesnt kill the hesitation in my particular case. It reduces it a bit and change where it happens.

We have something here called traffic here where you cannot maintain a 3000RPM

Mart

Quote:
Originally Posted by Phatron View Post
im really interested to see if you find anything.

the only thing i noticed in the hesitation logs was the AVCS bouncing around......but the mapping is smooth.

i thought the hesitation was around 3000rpm? So i wonder how zeroing out the Load Comp table helped the hesitation...since it only had values up to 1200rpm.

maybe you're just driving around at too low of an rpm. im never below 3000rpm......except in 1st gear.
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Old 07-14-2010, 01:47 PM   #47
Phatron
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just move to the middle of the desert right next to death valley and there's no traffic
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Old 07-16-2010, 04:10 PM   #48
bluescoobywagon
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Daluv, e-mail sent.
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Old 07-18-2010, 11:56 PM   #49
woodys77
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updates??
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Old 07-19-2010, 09:24 AM   #50
Daluv
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all my attempt trying to use the MRP spreadsheet failed. I guess I was not having enough data? I am away from my car for a week and I will resume shortly..
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