I had one sensor to begin with. the kit came with two sensors. So the sensors came with a wiring harness just like the fuel injectors did. one end plugged into where the old o2 sensor plugged in, and that connector then branched off into 2 more connectors to be plugged into the 2 new o2 sensors. I will attempt to contact IST again tomorrow but I'm not holding my breath that they'll pick up

 

By the looks of their website, its outdated. You might not get the support you need.

With EGR disconnected, and who knows what else, I'd check your computer for a piggy back tuner. If it does not have one, get the 4 digit code of the computer.
With so much disconnected, and missing, your going to need it tuned.
Theres cheap ways and expensive ways to tune what you have, depends on computer in the truck.

 

I'd unplug one O2. Try setting the idle AF to 14, 14.5 if that adjuster makes it possible.

I can't understand a Y connection to run two O2 sensors.

If you had to add wires to the ECM connector, that'd be something else. Makes no sense to me.

 

with the Y pipe the instructions say to have the two o2 sensors hooked up right after the manifold. I no longer have a Y pipe, I have longtube headers so I put the sensor as close to the collector as possible. I can set the idle to 14.5 which is the only way i've been able to safely drive the truck but still, it doesn't sound right, It's very difficult to explain over text, I tried to get a sound recording but its difficult to hear. the best way I can describe it is the sound of if you accidentally put it in 4th gear instead of second and the engine was struggling. something like that but very very faint in the background. Regardless the truck is burning more fuel and with a MAF conversion this was suposed to improve, which is why I've been trying to get the computer to run on it's own tune, not with me having to force it to run at 14.5

 

What a mess.

Return it, get a refund, get a real tuning solution that doesn't involve Y-'d off o2 connectors, "fooling" devices to "tune" it (which also throws off the load calculation in the process which makes timing incorrect), offers actual support, and doesn't have more unknowns than knowns. .

 

Yes this is a bit of a mess, too bad you're not getting better help from the manufacturer but here are a couple more points I now see.

The dual O2 sensors thing:
The PCM used here is most likely a Mustang version which used dual sensors, but in order for that to work correctly they have to be independently wired back to the PCM on separate pins. This Y connector for dual sensors thing makes no sense at all and suggest this vendor doesn't understand the product they are selling, so remove that extra wiring and sensor and just connect the single sensor. This should make no difference in the way the engine runs good or bad unfortunately, this is just useless extra hardware.

Firing order:
This hasn't been mentioned before but the Mustang PCMs use sequential injection and are designed for the HO firing order, but the motor in this truck uses the non HO firing order. So the harness in the kit must not only supply extra wiring for sequential injection but adapt between the two different firing orders. When Ford made these kits there were 2 different versions.. one for the old firing order and one for the HO firing order. I had one of the Ford kits on my '90 F150 for years, I used it on the original 5.0 and a built up 5.8, I modded the harness to work with the two firing orders, I ran it with single and dual O2 sensors on longtube headers, and I tuned it with a TweecerRT for the 5.8 with larger injectors and MAF meter.

So my question now is.... what firing order does your kit support? If it is for the HO that is a problem, the motor will run but not well so some wiring mods will be necessary.. but it's only 4 wires.

 

He really needs to figure out what ECU the kit uses as that will answer a lot of questions. If they removed the Ford label from the ECU connector then I don't know what to say other than good luck. If it's still there, what's the catch code?

 

The kit does support both HO and non HO firing orders. depending on which firing order you have, mine being a non HO firing order. The kit instructs you to wire the fuel injectors to different pins. I will attach the instructions to this kit bellow. If it helps I can pull the computer out to find out which one it is

 

Eeeks, that's quite the document, and in my opinion a hack job. I'd return it, spend your money else where.

For similar price(I think), you can get pimpx, and there is lots of support from them on these forums.

 

Hundreds less actually. $840 vs $1230 for their cheapest kit.

 

Unfortunately I doubt Id be able to return it, it took a lot of trouble to get and many many months of waiting. If i asked to return the product I doubt Id get any response back. If I cant even get a hold of IST to get tech spport there is absolutely no way I will be able to get my money back. This is obviously my mistake, there wasn't much info on this company at the time of ordering, I took a chance. As another potential solution, could I use this pimpx computer and use it to replace whatever computer I currently have? as in would I be able to use that new computer and take advantage of now having a Mass airflow set up with sequential fuel injection?

 

Filing a claim with your credit card usually gets a pretty quick response...

Without knowing what ECU you have now (from the kit) I can't definitively say if it would work or not. If it's a stock Ford ECU of some sort (which it should be) then it will work, though it may require moving a few pins depending on if it's a Mustang ECU or a Bronco ECU. You'd then be able to take advantage of the sequential portion of the harness and while you "could" keep the MAF, it would only complicate things for no benefit.

 

IST has been a come & go supplier in my time here.

I know there have been some stories of those who used their stuff successfully but can't point to a specific one..

Mostly it has been no returned e-mails & calls. What always scared me was the "this page last updated..."

There is a slight chance of ID'ing the unit, but would require opening it up & I bet it has a security tape on it.

Frequently in the ECMs I've seen there is sometime the engineering number & the processor is done in "hot pen" on the connector, see below:




In this case, this ECM is a F4TF-12A650-AAB

 

Well I think it's safe to say I need to get a bit more info in order to solve my issue. Ill have to see what computer I have, and I would also like to check my fuel pressure to see if that might be an issue as the IST tech said before he was cut off. I'd like to put a fuel pressure gauge on the fuel rail instead of just using a standard tester. also would like an adjustable fuel pressure regulator. does anyone know one that will fit the 3 bolt pattern fuel pressure regulator? or what fittings or parts I will need to hook up the gauge? tough to find that info online

 

Like SPE said, contact your credit card company, and file a claim, and this will sound like the 'I know a guy, that his friend's sisters husband' but he was given a Mustang Automatic ECM, and his Truck is a 5-speed, but anywho! IST responded a lot sooner than him trying to get them to answer him, and he sent all his stuff back to IST.

look up LMR or Summit 87-93 Mustang regulators are 3 bolt