Originally posted by warmonger:


I need different information.
I thought you had an SVT? If so, then you would not have an issue running svt injectors, so I'm gonna guess that you have an SE. Going on the assumption that you are using an SE pcm with SVT injectors.
So first can you confirm what car and pcm, maf, intake style, and any other non-stock parts you are using?

Okay, here are some ideas:
You can't trust the vacuum reading if your idle air control valve is opening and closing as in a rolling idle.
You may or may not have a vacuum leak.
You have hard codes but need to tell us what they are.
Baro reading probably isn't a big deal right now.

Lets go with the fact that the SE PCM is expecting 17# injectors and its own MAF. Are you useing the stock MAF right now? You should be at least for now.

Given that you are running SVT injectors = 19# on a car expecting 17#, that means you should be running rich. The long term fuel trims would be in the negative each by some amount, nothing that the pcm couldn't compensate for normally. On the other hand the engine is bigger and it will have to increase the fuel delivery and may have to trim positively for that. But on that note, the injector settings in the code are not listed by size. They are listed by about four or five numerical scalars, such as injector slopes and such. Since it takes four or five numbers to describe the injector to the pcm then it stands to reason that the pcm just doesn't know how to fire the injector and who knows what the hell it is doing.
We will need other information first on this.

For the time being put the stock injectors back in, put the stock maf on if it is not already on. Check for vacuum leaks, check for egr leaks.
Look at the IAC valve as a source for problems. Then drive it around without getting on it too much. Clear all the codes and pcm memory when you do. Then do some datalogging of long term fuel trims, injector pulsewidth/duty cycle, and look at the O2 sensors to see how they are cycling at idle and cruise.
Report back a qualitative opinion on the O2 sensors, idle quality and cruise when you do this as well as any numerical information you can give us.
Don't forget to check fuel pressure at idle, and snap the throttle to see if it jumps up when the vacuum leaves the FPR, or pull the FPR vacuum and see.
Also, do you have vacuum secondaries? If so they may not be closing at idle if you have a vacuum source problem. This would cause all kinds of headaches./

I don't think you should be getting any driveability issues form the widened secondaries as many people used to crack them anyway and I ran the same setup and never had a problem from it. The problem is most likely the engine being bigger, the injectors, airflow and fuel delivery are further off.
People with SVTs using stock SVT hardware can easily support a 3L change without a single tuning mod. With an SE its a different ballgame.





Thanks for the reply!

Yes I do have a SVT. I don't dout for a second that I have a vac leak. But it is internal (secondaries leaking too much.. Me thinks).

Codes were heater circuit faults, lack of switching etc. All for the post cat 02 sensors (I have no Catalyst Monitors on my car... I have headers w/o precats anyways).

Maybe this will clear some up. Sorry for the confusion.

I used to be a Driveability Technician at a Ford/Mercury/Lincoln dealership.

The ONLY 96 (engine) 3L Build 'em fast. Spray 'em faster. ricehatersclub.com