{ECM} Questions

[turbo2256b]

O2 sensors were fine in fact there in Creamy right now. Never had it "Tuned" if you mean dyno tweeked.

If something was wrong the MILL light would come on. I checked it for codes even though the lite didnt come on periodicly. Only issues were throttle position sensor went out once, EGR and pasages needed cleaned once and idle air bypass took a dump. That was over 100000 miles of driving. The car had just under 100000 when I made the changes. Oh the cats came appart and plugged up my 4 month old mufflers pissed me off having to replace them that quick.

[Blaze86Vic]

Well, my engine with the LOPO ECU wired so the injectors fired correctly with the cam resulted in running great for the first few minutes and then just getting worse and worse.

It may have worked for you because thing just happened to be perfectly even with the motor, I don't know. But that setup is well known problematic at best setup. So I wouldn't suggest it to anyone.

[turbo2256b]

Well, my engine with the LOPO ECU wired so the injectors fired correctly with the cam resulted in running great for the first few minutes and then just getting worse and worse.

It may have worked for you because thing just happened to be perfectly even with the motor, I don't know. But that setup is well known problematic at best setup. So I wouldn't suggest it to anyone.

You did have the LOPO ECU or the HO. What else was done. Mine with the HO ECM and LOPO injectors ran like crap. Switched the injectors to HIPO and ran good after that.

[LtMercDaddy]

For the very last time..... you DO NOT have to change the injector firing order between HO and non-HO ECM's

ALL of the 5.0L SEFI ECM's use the same injector firing order except the 91-93 T/bird and 94-95 Mustang.

Read here: http://fordfuelinjection.com/5.0Lpinouts.html

BTW... disregard the listing in black all the way to the right. To my knowledge, there never was a MAF mark 7

Very useful information, but just because the pinout on the ECM is the same doesnt mean the injector firing seq is the same.....

[Blaze86Vic]

You did have the LOPO ECU or the HO. What else was done.

Mine was an engine swap to a 95 5.0L HO and it was run with the Stock LOPO ECU, a T-bird ECU, 93 Mustang ECU, and in the end the 91-93 Cougar worked the best. These were fairly short trial periord, all of them were tested inside a one week period. Except the Cougar ECU which is on year 8 or 9 of testing hehe.

[mrltd]

O2 sensors were fine in fact there in Creamy right now. Never had it "Tuned" if you mean dyno tweeked.

If something was wrong the MILL light would come on. I checked it for codes even though the lite didnt come on periodicly. Only issues were throttle position sensor went out once, EGR and pasages needed cleaned once and idle air bypass took a dump. That was over 100000 miles of driving. The car had just under 100000 when I made the changes. Oh the cats came appart and plugged up my 4 month old mufflers pissed me off having to replace them that quick.

That statement amuses me. Even with all the broken or bad sensors I've encountered on my 20 or so fords, NOT ONCE has the MIL light ever come on. I could pull sensors off and the light never comes on. I've had codes and the light never comes on. And I doubt that every one of my cars has a blown bulb.

[gadget73]

My whole statement is with a sequetial injection setup. Not batch. Even sequential injection uses banked O2 sensors.

Sequential does indeed have banked O2 sensor, batch fire has 1 O2 sensor.

Mostly my concern, even with ensuring the injectors are firing in proper relation to the camshaft, is that the ECM is is programmed for a given set of characteristics on the engine, and putting larger injectors and a computer designed for a higher horsepower engine with a totally different camshaft in a stock motor would do very little for it. I also don't really see the point in a big throttle body tapered down to the stock lopo upper intake. Thats kind of like sticking a 4bbl carb on a 2bbl intake. It just necks down uneccesarily and restricts airflow. Maybe it did run fine and all, but I really have a hard time understanding why it would actually do any better than stock parts. The big injectors are really the kicker, I'd figure they would pump in more fuel because the ECM assumes more airflow than the lopo cam is going to give.

[turbo2256b]

Sequential does indeed have banked O2 sensor, batch fire has 1 O2 sensor.

Mostly my concern, even with ensuring the injectors are firing in proper relation to the camshaft, is that the ECM is is programmed for a given set of characteristics on the engine, and putting larger injectors and a computer designed for a higher horsepower engine with a totally different camshaft in a stock motor would do very little for it. I also don't really see the point in a big throttle body tapered down to the stock lopo upper intake. Thats kind of like sticking a 4bbl carb on a 2bbl intake. It just necks down uneccesarily and restricts airflow. Maybe it did run fine and all, but I really have a hard time understanding why it would actually do any better than stock parts. The big injectors are really the kicker, I'd figure they would pump in more fuel because the ECM assumes more airflow than the lopo cam is going to give.

Did you ever look at the older Mustangs. They used our lopo upper with a 59mm dia EGR spacer. The upper has like a 48mm dia. No taper no blend just a sharp ledge against air flow. Would be like putting a big gasket port matched intake on a stock cylinder head. Which would cause a port mismatch. Garintee it picked up air flow. I have seen 4bbls on two bbl intakes. 2 bbls on 1 bbl intakes. If done right works perty good. The ECM just does what the O 2 sensors tell it to do at least at idle and cruse thats the only time they work anyway. Friends often ask me "what the hell you got in this."

[turbo2256b]

I had the parts so I experment. It worked it worked well. Heck screwing around with turbo's I figured how to get more fuel out of a MAP sensor. I have spent most of my life doing stuff people said could not be done then did it.

[Blaze86Vic]

The ECM just does what the O 2 sensors tell it to do at least at idle and cruse thats the only time they work anyway.

Actually that is not true. The ECM uses the sensors for fuel trim during all closed loop conditions, which is usually anything less than 60-80% throttle. Some of the newer cars are getting better and able to run closed loop past 90%.

But on the other hand, if you drive like me, your engine don't see less than 70% throttle very often

[turbo2256b]

Just going by what my engineer friend says about our dumb and dummer ECMs. We only have what 96 pins