I've turned my fuel pressure down to 8 and still idles rich and rough. Revs smooth. Has new distributor and cap, plugs, iac,tps,fuel pump, fuel filter, o2 sensor,coolant temp sensor, injectors, rebuilt tbi, swapped map from my roller and nothing has changed. Only thing I got left is ecm and a new map but ecm seems to be working. I have some data logs I just got but will only allow one at a time. I tried swapping ecms with my roller but it wouldn't even fire injectors. Any ideas? Every once in awhile will idle smooth no issues until you rev it any then it's back to super rich and rough.

 

HOW do you know it's "super rich"? Smell? O2 sensor readings? Black spark plugs? Something else?

Misfire--including lean misfire--will "smell" rich; especially if the catalyst is defective, missing, or too cold to function. This would also account for the rough idle--it's misfiring.

Describe the data stream from the ECM when it's running rough. What is the coolant temp? What is the short- and long-term fuel trims? What is the O2 sensor voltage and cross-counts? Other sensors? EGR working properly, not stuck open?

 

Can just look at the cones and tell to much fuel but also blacked o2 and plugs. Smell and black smoke also. I'll post the logs.

 

I have never data logged no idea how to read these.

 

Last one.

 

Last one.

 

Really needing some help on this only thing I havent changed is the ecm.

 

Your not stating some key information.
what year is the car 88 or 89-92 ?
is this $61 mask ? What was the donor car ecm a 1228746 ?
are you datalogging with winaldl or tuner pro ?

 

Donor car ecm was also tbi. It was a remanufactured ecm. 89 tbi formula. Winaldl is what we used.

 

If the donor car is 89-92 it would have the same ecm.
try swapping the prom as well. The vats might be programmed out. Could also be a prom issue if custom tuned. Not a fan of winaldl.

 

Swapped the prom when we swapped ecms. Should we try it without swapping the prom? Not sure what year the other ecm is either. The roller is a 89 formula but dash was swapped.

 

Can’t hurt trying it with the old prom. If you don’t have the ecm service number list the prom letters and I’ll identify what ecm it was used in.

 

This is the reman ecm number is 8746 on other side.

 

That ecm should work, the prom letters I’m referring to are on the other side on a silver sticker.
datalogging with tunerpro might help and attach as a zip here.

 

Letters are APTY

 

That’s a good 89 305 manual prom but does contain vats.

 

Mine has vats also. I have key for other car but its jammed in the ignition. Swapping chips work? It would crank and no light but wouldnt fire injectors. Ecm is the only thing other than map that isnt new.

 

Both ecms should be the same you can swap proms.

 

I did swap proms injectors wouldn't work with the other ecm with my prom in it

 

Sounds like your reman ecm is bad.
I think 77-8746 is a cardone . It was used in f body tbi 89-92
if your ecm was good it should even fire up without prom in limp home mode.

 

I think the car is running in limp mode now. It idles super rich but can hold any rpm over 1300 smooth no missed or anything. It isnt missing at low idle either just rough idle from being rich. Even with the fuel pressure turned down to 8psi its rich but revs smooth. Think prom could be bad?

 

The prom rarely goes bad, if it does you get a code 41 or 51.
try datalogging in tuner pro and past as a zip I’ll see if anything stands out. The only thing now I can think of is cts wiring or ecm being bad.

 

We made the aldl cable will it work with Turner pro program?

 

have no idea what you made

 

Got a link to a cable that will work with the tuner pro and aldl?

 

http://www.moates.net/aldu1-and-cabl....html?cPath=64


yours might work I have no idea what you made. I think you need to start dataflow with a 10k resistor.