Should I have Ion lean out the tune and send me another one?

If you can get that email it'd be awesome...I'd rather troubleshoot before I go throwing parts at it...some "Mustang" people seem to think I have a blown head gasket/lifted head, and a leaking intake gasket...but, I don't really think that's possible. "Yeah just yank the heads & intake off, slap some new gaskets on, call it a day"...I think they fail to realize I'm working on an LT1...the heads don't just "pop off" without dropping out the whole front of the car. I don't see how it would be that anyways.

Hopefully the O2's are good, since they have 10 miles on them...I could crack open the TB blades some more, but, they were OK before, should be now? Still crappy when revved, so I don't think it's those...I'll check my airbox for a rats nest, just in case.


I hope so! I set them running with a stethescope...

I'll check all my vac lines again...where exactly would I hook up a vac gauge to, and what would I be looking for?

Timing chain is a brand new Cloyes setup...highly doubt it skipped...and timing is only changed in the program right? That didn't change either. COULD be the opti, somehow crapped out over 15 miles maybe? (Well, has 111K on it, but it WAS OK...)

I'll give that test a look-see, thanks!

I just may have to take you up on that offer! Do I actually have to take the opti apart to replace it? Or is it an opti with a bad high side? Shoot me a PM if you don't mind with a paypal address and I'll shoot you my addr; and I can send you some money for shipping?

THANK YOU!!!

 

Doesn't look like that test will help me...I know I'm getting signal from the opti, because it's the coil packs are getting signal to fire...that test won't give me any timing...

Just to recap I've got a Delteq system.

 

Lean it down.
Thats why I asked if ya could turn the FP down.
Ya got some smaller injectors to put in it to keep the thing running long enough to check it fully?

Something has changed and ya ain't gonna find it if ya cant run it but 10 minutes and then go get a new set of plugs-- that's expensive.

 

VERY expensive for all the plugs!

Correct me if I'm wrong here, but I thought I read that an adjustable FPR was useless on these cars, because the PCM will re-adjust it back via electronics, whatever it's supposed to be? Like if you lean it out, the PCM will fatten it back up by squirting more gas?

I only have my stock injectors...

I'm going to go check out the AKM site to get a cable for my laptop I guess is the next step...

EDIT: Damn...$90 for a cable...WTF! heh

 

I run a ADJ FP reg set at 52# and the computer don't bother it at WOT. Not to much worried about closed loop as long as it is drivable. Depends on the way it's tuned.
Put your stock injectors in it and trouble shoot it. Ya won't be able to beat on it 'cause ya will be lean but it will run desent at low speed to check some things.

 

Closed loop is NOT when WOT, correct?

I'm really not sure how it's tuned...like I said I got an OBD-I conversion from MadZ28/Ion...I'm pretty sure I still have the stockers, I can throw those in and see what happens then also.

Would a datalog help troubleshoot much?

 

Correct,closed loop is Put Puttin around enjoying the lope of the cam.
Maybe Injuneer could help but those things give me a eye strain unless it's a readout of the type I am used too. Old fart ain't up to speed on ALL this different electronic stuff.

 

Correct, closed loop is when the pcm is reading the o2's and making corrections to sustain a "stoich" air/fuel.

 

Well, those stock injectors may be one of the problems you are having. I have 26# on my 388 and they are shlt. I am going to 50# when I get my tune to get the best performance, that car is going to need more gas if you ever get it running right.

 

Mike, I think he has other injectors and his only other set is the stockers.

Bret

 

Right...I have 42#'s on it right now...

 

When you did the OBD1 conversion did you also swap out the Knock Sensor on the passenger side of the engine? If not you will need to do this because the obd1 vehicles use a different ohm sensor..

Cody

 

That's true but, when you order the OBD1 conversion ION/MADz28 goes into the pcm and makes it read the OBDII sensor correctly so that's not the problem. One thing is, it's running rich, those 42# injectors may be what's doing it, because when he got the tune, he had to let the guy know he's using 42# and not stock, if he didn't tell it to the tuner, that car is dumping fuel and not pulling enough air. Did you tell the guy you had those injectors???

 

Yeah I told him I had 42#'ers...He's on the board, maybe I'll point him to this thread to get an opinion.

I have the stock knock sensor, but I replaced the knock module in the PCM with a LT4 KM as reccomended.

I haven't got a chance to try my stock injectors yet.

 

How many miles are on those o2's?