<SOLVED> Stuttering

[daveismissing]

tevestutr05_02_13.wmv

[daveismissing]

boost

tevestutr05 02 boost

[Steve Wood]

this is with the additional fuel pressure I asked you for?

[daveismissing]

this is with the additionsal fuel pressure I asked you for?

No, I wanted to see if the small metco was/wasn't fibbing as baseline.
Thats next- rain delay encore.

[Steve Wood]

Again, if it will do it in park, you don't have to drive the car.  Let it get cold, add the fuel pressure, and rev it in park....does it stutter, or not? 

What is your vacuum reading in Park at idle?  Is the idle steady when it is missing in park?

[ULYCYC]

Put down the labatts and listen to Steve.....

[daveismissing]

That's CC please.


Beer is only for public buick events

[Steve Wood]

LOL

Do it this way.  With the fuel pressure where it is, and the car warmed up so that it does not sputter in Park:

give me the scanmaster readings for all parameters in Park at idle and at the rpm where it normally would sputter when cold.

Then give me the same at idle and at that rpm with +5# added to the fp. 

Take a pad and pencil with you-Leave it in Park for all four readings

[daveismissing]

	49Lb	43Lb		49Lb	43Lb
	hot	hot		hot	hot
r	1600	1600		1225	1225
Ats	112	111
Clt	178	179		178	178
BL	117	119		115	118
Int	131	121		123	123
L8	34	33		34	32
AF	10	10		8	8
O2	797	765		796	792
IAC	32	35		14	22
TPS	0.58	0.56		0.54	0.54

[Steve Wood]

Your car idles at 1225 rpm?

There seems to be something wrong with the tps

[daveismissing]

Those are rpms where the stutters happen.
I missed the idle bit (eek), let me go see how warm it still is....

[Steve Wood]

And, tell me what the vacuum is at idle in park and in drive (at idle)

[daveismissing]

	49Lb	43Lb
	hot	hot
r	800	800
Ats	105	103
Clt	176	178
BL	118	118
Int	128	128
L8	33	34
AF	4	5
O2	824.179	890.089
IAC	27	30
TPS	0.38	0.38

[daveismissing]

And, tell me what the vacuum is at idle in park and in drive (at idle)

-18 park
-14 drive

[Steve Wood]

Okay, I admit to being lost.  Car is rich at idle and ecm is pulling fuel.   It does not seem so rich on the first two sets of data...maybe a little, and the ecm is still pulling a lot of fuel to get it to where it is.  Adding 5-6% more flow, I would have expected a greater increase of fuel being pulled as evidenced by the blm numbers.

I also don't understand the 8 in the maf reading at idle in one of the above.  It should have stayed on 5.

Vacuum is good...I might have guessed a little more in Drive, but....I think it is okay.

With the engine off, if you very slowly ease down on the gas pedal, does the tps increment smoothly between .50-.60 v?   I guess I need to check one of mine to see if there is so little change between 1200-1600 rpm.

Do you have another o2 to stick in it to see if it does the same thing?

On a cold start, does it stutter with the extra added fuel pressure?