[DonP]

And what is that upper intake manifold from?

 

[Nailbender]

Start by checking the tread depth on the rear tires from time to time.

If it seems to be going down precipitously, you have your answer.

🤦

 

[Mcmahst]

Look, there are Ford OBD-1 testers out there. Look on Amazon for one. You should have that weird connectors guys have shown to do the blinking light test. The decent testers are like less than $50 for this. Get it, test it, follow the directions carefully. I’ve even seen them at Autozone. Let us know what codes you find. The user manual with most are excellent.

 

[Nos681]

The ECM if stock and not reprogrammed is a 93 Mass air flow with sequential efi.

Is there a MAF on intake inlet?
I couldn’t see one from the posted pictures.

 

[Mcmahst]

I think that electrical fitting on the metal tube on the intake is the MAF you're looking for. He needs to locate the test port so we can get helpful codes. Otherwise, we’re all guessing.

 

[Nos681]

The connector in picture appears (at least to me) it might be the Air temp sensor for ECM.

The foxbody MAF had an oval 4 wire connector.

It was common to read in magazines where the Air temp sensor was relocated to the intake tract to fool computer that the air was cooler…for more power of course.

The factory location was on the #5 runner on the lower intake just behind the distributor.

Retrieving error codes would be a good first step.

 

[kb65]

He can use a speedometer app, to tell how fast he is going.

Speedometer app will tell him how fast he needs to know how far

 

[gwstang]

Speedometer app will tell him how fast he needs to know how far

The app usually has a gps in it too. That is how it can tell how far/fast it is going.

 

[b_arrington]

The ECM if stock and not reprogrammed is a 93 Mass air flow with sequential efi.

Is there a MAF on intake inlet?
I couldn’t see one from the posted pictures.

Thanks for the info - did you decode the numbers on the ECM to get that?

Yes, it has a MAF in the intake, here’s a pic.

Also I think someone said the color of the injectors can show what they are, so here’s a pic of one. They are grey.

 

[pollock]

Some people have posted their very good 5.0 efi mileage. A couple have posted mileage I don’t believe. I’ll post my real in-town, not-perfect-engine, city-only, short-drive mileage: 13 mpg. Still a 50% jump from what you are seeing.

Check codes, check the brakes, make sure your odometer is right. You’ll find it.

 

[kb65]

Some people have posted their very good 5.0 efi mileage. A couple have posted mileage I don’t believe. I’ll post my real in-town, not-perfect-engine, city-only, short-drive mileage: 13 mpg. Still a 50% jump from what you are seeing.

Check codes, check the brakes, make sure your odometer is right. You’ll find it.

My 65 289 is around 16-18 around town 22 on the road if i can keep my foot out of it.
If i am really having a good time it is around 10

 

[CJM68GT390]

Just adding two thoughts not already covered.

• Based upon you description of odor in the garage after starting, you may be way rich during cold running. Like having a chock that doesn't open as quickly as it should. This would really affect mpg for short trips but would be good once warmed up.
• Check the timing as retarded timing can result in poor mpg but often not adversely affect how the engine runs. Not sure how to do that with your engine but be sure to disconnect the vacuum advance if you have it (check online on how to time your engine).

Good luck and let us know what you find.

 

[Mcmahst]

If you want additional help, Stang.net has helpful folks, and one specific site for issues with 5.0’s from your donor year:

https://stangnet.com/mustang-forums/forums/fox-5-0-mustang/

I have found this a good source for problem solving as I have an 87 donor 5.0 in my 73 Stang. Good luck.

 

[DonP]

I might be off base. But I believe the E4OD or AODE would require a separate aftermarket controller from the ECU. And that controller might have an LED display that could be set to display MPH. If you don't have a trans controller, you might have an AOD.

 

[Nos681]

Thanks for the info - did you decode the numbers on the ECM to get that?

Yes, it has a MAF in the intake, here’s a pic.
View attachment 925885 View attachment 925886



Also I think someone said the color of the injectors can show what they are, so here’s a pic of one. They are grey.

View attachment 925887

The information is on the label by the 60 pin connector.

EECIV = engine management

SFI = sequential (9 different colors on injectors…red is common)

MA = mass air flow

F3ZF = ‘93 Mustang

C3W = “tune”…aka “strategy”

Here’s an ECM from an ‘87 Mustang:

SFI = sequential fuel injection

SD = speed density

Below is a ‘97 F250 SD EFI that is bank/batch fired. This has only 3 different colored wires to injectors.

Speed density ECM’s came in two varieties.

Speed density doesn’t have a Mass air flow sensor.

 

[Nos681]

There’s great information here for future reference.

https://www.vintage-mustang.com/threads/foxbody-5-0-in-a-classic.1215135/#post-10839701

I performed my swap back in 2018…yours may have been done much earlier.

 

[W427]

Also I think someone said the color of the injectors can show what they are, so here’s a pic of one. They are grey.

Maybe not. The color is the top 1/3 of the injector, the plastic part. You can clean with a shot of spray, or just pull the connector to see the clean color under it. Also, the exact injector number is cast into the little bar in the photo, although it's tough to read in the vehicle.

 

[kb65]

Maybe not. The color is the top 1/3 of the injector, the plastic part. You can clean with a shot of spray, or just pull the connector to see the clean color under it. Also, the exact injector number is cast into the little bar in the photo, although it's tough to read in the vehicle.

View attachment 925974

https://www.fordforums.com/threads/injector-colours.41526/

 

[b_arrington]

Maybe not. The color is the top 1/3 of the injector, the plastic part. You can clean with a shot of spray, or just pull the connector to see the clean color under it. Also, the exact injector number is cast into the little bar in the photo, although it's tough to read in the vehicle.

View attachment 925974

Wow, this is super helpful! Thanks!

I looked up my MAF and found that it’s rated to match with 19lb injectors. So if need to replace them I’ll know what to get. I’ll still try to see what’s installed.

 

[Woodchuck]

A bit late to the game but 9 mpg in around-town driving, with the propensity for a bit of "lead-footing" is around what I'd expect from his combo.... The E4OD, while being particularly "stout" is, like it's C6 predecessor, big, heavy and a parasitic horsepower hog. My old F-150 didn't fare much better than that unless I got a chance to cruise the open road.