Question about LV8 counts, MAF tables, etc

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Apr 9, 2004 | 05:25 PM

Jerriko 3.4

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Joined: Feb 2004

Posts: 182

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From: Rockford, IL

Car: 1987 Firebird Formula

Engine: 3.4L 207 V6

Transmission: T5 W/C

Question about LV8 counts, MAF tables, etc

I have a 302 ecm and $3a definition file. I am running it with a 3.4L cammed motor. I have modified it with the throttle body off of a TPI setup. I am using the 24lb injectors. Currently, the ecm is throwing the code for too much airflow through the MAF. The airflow required is greater than what the eprom was programmed with. I have been playing with the MAF tables. I have many questions:
In the MAF tables, should I increase the gms/Sec per LV8 count?
Should I change the gms/Sec in the Maximum Air Flow vs rpm?
Will I need to adjust the pulse width multiplers and other related tables?

Any help is appreciated,
Jim

Apr 9, 2004 | 07:23 PM

RBob

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From: Chasing Electrons

Car: check

Engine: check

Transmission: check

You need to find the diagnostic parameters within that mask ($3A). What happens is that an airflow parameter vs RPM vs TPS is exceeded and it throws the code. Changing and one of or all of the diagnostic parameters will fix it.

Here are the MAF high parameters from the '165 $32 code:

Code:

	;--------------------------------------------------
	;       error # 33 Params
	;       >> MAF Sensor Hi <<
	;--------------------------------------------------

	ORG     $C203

LC203:	FCB	38	; If TPS >= 14.8%, set error #34
			; CALIB = Arg * 2.56

LC204:	FCB	45	; If Air flow <= 45 gms/sec
			; disable error #33

LC205:	FCB	96	; If > 0.6 Sec, Set code #33
			; CALIB + Arg * 160

LC206:	FCB	8	; 800 Msec error 34 Min time req.
			; CALIB = Arg * 10

LC207:	FCB	128	; If RPM > Disable #33
			; RPM/25

LC208:	FCB	100	; 10.0 VDC PUMP VDC FOR error 33 ENABLE

This is just to give an idea of what needs to be changed. The V6 ECMs have little support and even less of a knowledge base.

RBob.

Last edited by RBob; Apr 9, 2004 at 07:26 PM.

Apr 11, 2004 | 10:06 AM

funstick

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Joined: Jun 2002

Posts: 1,787

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From: great lakes

Quote:

Should I change the gms/Sec in the Maximum Air Flow vs rpm?

yes but to do so youll need to change the scalar for that table. get with me via email. or hell if your willing to make the drive i live just north of novi in michigan west of pontiac in a small town called white lake. i see your in rockford a 3-4 hr drive. i have lots of experience with $3a