JN's Minram Backfire UPDATE!

[rr]

Jason,

What is the time interval between each row? It does not look like
you opened the throttle too quickly or that much. I know the '747
better, however, I hope some of what I say applies to yours.

There is a delta rate threshold that needs to be exceeded before
any AE takes place. On the '747, there are two, one for MAP
and one for the TPS. See if there is something of this nature with
the ecm you are using. Check that they are not set too high.

You might also want to find the AE term and have that output
on the aldl for a look see.

BobR.

JN wrote:

> Hi,
>
>     Some of you have asked about my throttle position and O2 volts as to
> weather it was a decel enleanment or not. Well......I just so happened to
> record a backfire while driving (ie under load) and take a look at this:
>
> TPS    O2        LV8        Pulse     INT        BLM
> .61       88        38        1.3            128        122
> .63       681      34        1.2            128        122
> .63       44         35        1.3            128        122
> .63        0           36        1.3            128        122
> .74        0           44        1.6            128        122
> .86        0            67        2.6            128        126
> .90        0            77        3.1            128        126
> 1.14      496      117       4.5            129        122
> 1.49       0          184       7.1            130        122
> 1.67        0         105        2.8            132        122
> 1.69        841    137        5.0            132        122
> .98           4        182        8.0            128        122
> .76           889    100        3.6            129        122
>
> This is with the pump shot tables increased by almost 3 times.  I might get
> the backfire once out of every 15-20 throttle transitions but always a flat
> spot that wasn't there when the Super Ram was on.  The above tables also
> were at FP to 48 psi at idle and 55 psi vacuum line off with spikes to 60 if
> you blip the gas.  What hey who is going on here?  Should I just hammer in
> more pump shot?   Try the 30 pounders?  Also what is an Alpha N system?  Is
> that fuel trims that don't use the MAF for trimming like early PE?
>
> Thanks
> Jason
>
>

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