Fox Issues

MYTURBO · Sep 4, 2016

Alright, I've been having a few issues RECENTLY..

Car runs super rich! Throws Lean codes. Sputtering very romp...romp...etc idle (not surge)

Pulled the intake as it seemed to be leaking causing a vacuum leak. Figured that was my rich, lean code issues.

Got it all back together , installed a msd 6al2 while I was at it.

Got it all back together. Still have the same issues! And I noticed when i run codes it shows **6cyl** now . Makes no sense!

Also cylinder balance test comes back just fine..

Mustang5L5 · Sep 5, 2016

What are the actual code numbers?

The 6cyl thing is common....ignore it

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mikestang63 · Sep 5, 2016

disconnect the MSD..check all vacuum lines and that all bolts are torqued down. As Mike said, what are the actual codes.. Could be a lot of things. Do you have any smog equipment disconnecct?

MYTURBO · Sep 11, 2016

Sorry guys, been trying so many things. And nothing has fixed it. Tried multiple ECU's.

Now the cylinder# is just blank, no number at all.

Checked pump out, injectors, fuel pressure. Made sure no injectors are leaking and the fpr isn't leaking or bleeding off, pulled engine harness, went through all the wiring, tested from end to end. All good. Tried 3 mafs, new Distributor etc.

No emissions are on the car, egr is plugged in with no vac line, been this way over a year without issue.

Only thing I get is lean codes, and emissions but I always had ems codes, but the car runs rich! Idle and low rpm,cruise issues

Changed the oil 6 days ago. Smells of gas already. Only drive the car 30-40miles a week.

I'm just at a loss, getting really close to going carbed lol

MikeH686 · Sep 11, 2016

You need to take the msd off first to verify you didn't mess something up wiring it

Mustang5L5 · Sep 11, 2016

So what are actual codes?

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MYTURBO · Sep 11, 2016

MikeH686 said:
You need to take the msd off first to verify you didn't mess something up wiring it

It was the same issues before hand, unhooking the msd makes no change.

Codes are emissions and lean (02s) but the car isn't lean. Rich by a long shot!

Currently have the eec harness out on my kitchen floor, 2 pinouts I can't find a end connection to.

Searching as we speak for what these wires are for.

90sickfox · Sep 11, 2016

I chased my tail on an issue like this. My car idled bad....the fumes would run people out of my shop and got lean codes.

The problem ended up being my o2 sensor harness was shredded on my k member. The computer thought it was lean so it dumped fuel.

MYTURBO · Sep 11, 2016

I messed with the o2 harness about 6mos ago when I had issues, got it fixed. So I didn't really look into it this time.

I know right now 2 wires are dead in the eec harness.. can't find an 89 pinouts to figure it out.

90sickfox · Sep 11, 2016

What pins are they ? I can take a look in the am in my service manual. Sure someone here knows them by heart.

MYTURBO · Sep 11, 2016

90sickfox said:
What pins are they ? I can take a look in the am in my service manual. Sure someone here knows them by heart.

Found a diagram, all fixed but 1, pin 4 which goes to the tfi module connector.

I see in the diagram their is an inline resistor, guessing that's the issue

MYTURBO · Sep 12, 2016

Could anyone tell me what the left capacitor is for ? Noticed all my ECU's are burning them out

MYTURBO · Sep 12, 2016

So the ecu harness checks out, I didn't know a few wires had to be tested at a certain resistance, due to the resistor in the wire.

Also pulled the 02 harness and tested for shorts, and connection. It's perfect
Engine harness I did last week.

So with that being said, Who's got some ideas ? Could an 02 throw a lean code, but be bad and cause rich running. And blowing the same capacitor in the ecu ?

FoxMustangLvr · Sep 13, 2016

Shouldn't this be in tech where @jrichker can help too? @MYTURBO I think posting all of the engine codes would be best so jrichker and others can see all the cards on the table and help you out the best that we can.

MYTURBO · Sep 13, 2016

As I said earlier, only codes are emissions (which don't matter) always had them with no issues, and Lean Codes. But car runs rich.

No other Codes

MYTURBO · Sep 13, 2016

Could, o2 sensors be bad , throw a lean code and cause these issues ?

I haven't tried new ones, as i don't want to just throw parts at it in hopes all is going to be better.

Gearbanger 101 · Sep 13, 2016

What are your mods. Sounds like your car is running lean to me, not rich?

Mustang5L5 · Sep 13, 2016

Only situations can see where car runs rich but throws lean codes are if the o2 sensors themselves are bad. They are telling the ecu to fatten up the mixture and are not responding.

What year is this car? It's not a MAF conversion or 2.3L conversion is it?

Actual code numbers would be a big help vs description.

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MYTURBO · Sep 13, 2016

It runs rich for sure. Raw fuel.

It's a built alum headed 306.

Tried different injectors,fp, fpr, mafs, tps,iac, ECU's. Messed with every harness. All have tested good.

Figured the lean code but running rich may also be vacuum leak, pulled intake and re sealed everything.

Issue is still present

MYTURBO · Sep 13, 2016

87 2.3 car. 89 maf harnesses a91 etc.. the car ran fine for a long time. For about a month it has done this.

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