84 cross fire running rich at idle

[Gator]

Well, its been a while, Life rules but I am back at the 84 crossfire, I did have to change ECM to 1227747 , still having Idle issues (really rich) starts out with low idle the as it warms up the rpm increase to 1200 and that is where it stays , fuel pressure is @13psi, replaced injectors and reinstalled stock intake. I have not done any data logging yet because it runs so poorly. I have tried different bins all have basically the same result.
has any one successfully upgraded ECM on the 84 Crossfire injection?? I know no one likes them

[dave w]

Are you setup to reprogram the 1227747 PROM chip?

dave w

[Gator]

Yes, using motes F&B and adaptor installed in 1227747

[dave w]

Yes, using motes F&B and adaptor installed in 1227747

A data log can provide useful information, even when the engine is running poorly.
Base Pulse Width (BPW) is an important parameter.

dave w

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[Gator]

Thanks Dave, I did need to Change BPW to 120, I will get some logging done and post the results

[dave w]

Thanks Dave, I did need to Change BPW to 120, I will get some logging done and post the results

My 1227747 tuning experience has shown me to keep the BPW "window" to +/- 10% of the stock setting. Typically the 1227747 5.7 Liter TBI has BPW of 135, so a window of +/- 10% is a BPW between 121.5 ~ 148.5. TBI Injectors have a BPW "sweet spot", to much BPW causes idle quality and low speed driving issues and not enough BPW causes hesitation and driving issues at upper RPM's.

dave w

[1project2many]

has any one successfully upgraded ECM on the 84 Crossfire injection?? I know no one likes them

I started with an 83 5.0 F car auto trans ecm and calibration, then switched to an 84 5.0 F car ecm, then switched to a 1227747, and currently run a 1227427.

fuel pressure is @13psi

Changing fuel pressure always made a large difference when I was using a stock ecm. Generally I kept pressure around 10 psi back then.

starts out with low idle the as it warms up the rpm increase to 1200 and that is where it stays

Have you balanced the throttle bodies yet?