efi problem [mustang system]

[stupidboy]

What kind of help are you looking for?

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the kind ya pay for.

 

[jmhend]

the kind ya pay for.

That counts me out. Good luck buddy


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[DirtDonk]

I think part of the question is because it’s EFI and a factory computer, there is no actual “tuning“ available in standard form without some extra equipment and expertise.
You hook it up to the sensors, plug it into power and go.
If it needs tuning then perhaps while it’s being looked at and rebuilt by computer expert is when it should be tuned to any changes you’ve made to the engine.

My understanding is that even if someone could pop over and tune it for you on site, the computer would need the add-on bits before the tuner could hook it up to their equipment and make changes.

 

[lars]

I think part of the question is because it’s EFI and a factory computer, there is no actual “tuning“ available in standard form without some extra equipment and expertise.
You hook it up to the sensors, plug it into power and go.
If it needs tuning then perhaps while it’s being looked at and rebuilt by computer expert is when it should be tuned to any changes you’ve made to the engine.

My understanding is that even if someone could pop over and tune it for you on site, the computer would need the add-on bits before the tuner could hook it up to their equipment and make changes.

It’s an EEC IV ECU. Only way to custom tune it is to plug a Moates Quarterhorse into the J3 port on the back, then use software like Binary Editor or TunerPro RT to create a custom binary file (tune). Datalog, use the info to optimize the tune. Once you are satisfied, burn a permanent chip and use it to replace the Quarterhorse. I’m in the middle of that right now, with my 408.

As an aside, you may have heard of the tWeecer RT. 15 years ago it was the standard tuning device for Ford ECUs with J3 ports. You can still get them but they have largely been supplanted by the Quarterhorse, which has a lot more capability. My tWeecer is gathering dust in a drawer somewhere…

 

[stupidboy]

I guess I was hoping someone that has Quarterhorse and Binary Editor could do this for me and burn a chip.

 

[lars]

I guess I was hoping someone that has Quarterhorse and Binary Editor could do this for me and burn a chip.

You'll need to get your own Quarterhorse, and you'll need a laptop with some software, but someone else can do the actual tuning.

 

[stupidboy]

Is it one time use or something?

 

[lars]

Is it one time use or something?

Not exactly. https://www.moates.net/quarterhorse-for-fords-p-199.html
But when you are done with tuning you remove it and replace it with a permanent device that also lives on the J3 port. And you sell the Quarterhorse to the next guy.

 

[stupidboy]

I may have this back today.

 

[Timmy390]

WOW so it had multiple issues......

Tim

 

[lars]

I may have this back today.

Bummer that you were sold a lemon, but it sounds like the repair outfit was able to make lemonade for you.

I looked through all your posts. Seems that your setup is pretty much stock Mustang 5.0 except for the 351W block. If you posted anything about the 351 build, I missed it. Also, what fuel injectors are you running? If you aren't sure, just look at the color. The reason I mention all this is because if it's a stock truck 351W and you have 19 lb/hr (stock Mustang 5.0, they are orange) injectors, your rebuilt ECU will probably run your combo pretty well as-is.

 

[stupidboy]

Bummer that you were sold a lemon, but it sounds like the repair outfit was able to make lemonade for you.

I looked through all your posts. Seems that your setup is pretty much stock Mustang 5.0 except for the 351W block. If you posted anything about the 351 build, I missed it. Also, what fuel injectors are you running? If you aren't sure, just look at the color. The reason I mention all this is because if it's a stock truck 351W and you have 19 lb/hr (stock Mustang 5.0, they are orange) injectors, your rebuilt ECU will probably run your combo pretty well as-is.

All stock 351 and the only thing changed from mustang is explorer injectors, tb, and maf.

 

[stupidboy]

Ecm is back in and it runs without flooding but not right. Stalls after iac lets off high idle, and I can now put it in gear without stalling. seems like it has no power, and when you mash the throttle does it ever spark knock.

 

[tasker]

you set the timing i m sure? are you running a spout connector on the loom?

 

[stupidboy]

Yes, running a spout connector but it doesn't look like that. I"m questioning the timing marks I can't remember but with that front dress and the 5.8 or original 302 balancer I'm not sure I have the right marks. I think I'm going to use some timing tape next.

 

[rjrobin2002]

Do yourself a favor and join a mustang forum and find a ford dyno tuner to take your rig to in your area.

There are some that will remote tune, but I am taking mine to a dyno tune about 5 hours so I will know it's right.

 

[stupidboy]

I'm coming in late - what ECU are you running?

Mustang ECU + Explorer Intake and Throttle body is going to experience idle issues. My guess is that your base idle air is too low, and that's why it's dying.

I have a Mustang ECU on a 351W with a cam on the hotter side (in my rock crawler) that experienced the same issue and I had to retune the ECU with Binary Editor. I will see if I can dig up all the things I changed - but there are a lot of variables in the idle function that can really screw this thing up until it goes into closed-loop at idle (~140°F and some period of time). I'll have to look at my tune to see specifically.

I like this guy in these videos, I wish he were closer so that he could tune mine.

 

[lars]

Yes, running a spout connector but it doesn't look like that. I"m questioning the timing marks I can't remember but with that front dress and the 5.8 or original 302 balancer I'm not sure I have the right marks. I think I'm going to use some timing tape next.

The photo Tasker posted is a factory SPOUT. Seems to me that at least some aftermarket harness manufacturers use something that looks different. What ever. It's just interrupting the timing control when you pull it, kind of like disconnecting the vacuum advance before setting timing on old skool distributors.

If you don't trust the timing marks, you can find TDC the old fashioned way. If you drop a wood dowel into the spark plug hole, watch it as you are approaching what you think is TDC. It'll stop rising, then start falling again. Half way in between is TDC. A more accurate way is similar but you need a fixed stopper in #1 spark plug hole, that will hit the piston as it rises, preventing the engine from rotating further. At that point, make a mark on the balancer. Then rotate the engine backwards until it hits again. Make another mark. TCD is half way in between. A hassle, but at least you'll be able to trust it. Then set timing to 10° BTDC.

You may still have an idle issue after that but you'll have an accurate starting point so you don't wind up chasing your tail.

 

[Viperwolf1]

All stock 351 and the only thing changed from mustang is explorer injectors, tb, and maf.

The explorer throttle body works ok with mustang injection. Explorer injectors are either 19 lb or 17 lb depending on the year, so you may have a miss-match there. Explorer MAF does not work well with stock mustang EFI.

 

[76Broncofromhell]

This may be an eye chart - but this is all of the stuff I had to change to get my 351W with a decent duration camshaft to idle when cold.

Type	PID	Description	A9M_GPW_R7_MAF120_KAMRF_CANPR	A9M
Scalar	PFEHP	Air - EGR System Type	Disabled	Sonic
Scalar	THRMHP	Air - Thermactor Present	Disabled	Enabled
Scalar	ADAPTM	Fuel - Adaptive Control Delay Time	50​	60​
Scalar	MAXADP	Fuel - Adaptive Control KAMRF Maximum	1.1484​	1.1211​
Scalar	MINADP	Fuel - Adaptive Control KAMRF Minimum	0.8516​	0.8789​
Scalar	AFECT1	Fuel - Adaptive Control Min ECT Minimum	160​	170​
Scalar	Z_AFR	Fuel - Air Fuel Ratio	E10	Gasoline
Scalar	SHFRPM	Fuel - DFSO Shift Min RPM	750​	650​
Scalar	AHISL	Fuel - Injector High Slope	24.0003​	19.6417​
Scalar	ALOSL	Fuel - Injector Low Slope	31.9208​	26.0997​
Scalar	FKARC1	Fuel - Manifold Filling Model Fast Filter Constant	0.2946​	0.25​
Scalar	FKARCH	Fuel - Manifold Filling Model Slow Filter Constant	0.2209​	0.2​
Scalar	Z_PUMPP	Fuel - Pump Prime Time	2​	1​
Scalar	IDLRPM	Idle - ISC Max Idle Closed Throttle	922​	850​
Scalar	ISCLPD	Idle - ISC Maximum Drive RPM	896​	824​
Scalar	DNAC	Idle - ISC RPM Adder For A/C	200​	24​
Scalar	TKDTM	Idle - ISC Startup Kickdown Time	35​	25​
Scalar	BZZRPM	Idle - ISC Startup RPM Adder	96​	64​
Scalar	DACTM	Idle - RPM Adder for A/C Time	2​	5​
Scalar	HWRPM	Idle - RPM for Heated Windscreen	744​	672​
Scalar	DRBASE	Idle - RPM In Drive	744​	672​
Scalar	NUBASE	Idle - RPM In Neutral	744​	672​
Scalar	ITHBMA	Idle - Throttle Body Air Flow	0.7771​	0.55​
Scalar	ROM_TO	System - Checksum	56569​	9795​
Scalar	SARCHG	System - Engine Displacement (CID)	354.99905​	301.08332​