Well, for starters pull codes. That will get you in the ball park.
My first guess is something to do with the ignition system.
Do you have good wires (how old...not"they look pretty good")?
How old are the plugs? Are they Gaped Correctly?
How is the spark? (Bright Blue or White?)
Fuel Pressure? (Good/Bad?) around 35-40psi is where I believe it is suppose to be.
What else did you mess with?
When you stomp on it does it blow black smoke out of the tail pipe and idle rough?
You have to give a lot more information on your problem.
First I would pull codes from the PCM and see wat's going on.
Where's the smoke coming from? engine or tailpipe etc.
I would use the "search" above and see if there are any threads similar to your problem.
You can disconnect the IAC and using your Dash Tach, set the idle by adjusting the idle stop screw and Haynes book for idle reference.
Yoy also might want to pull the TB and clean it with TB cleaner only and replace the gasket if necessary. Just a thought.
Just because it's new doesn't mean it can't be defective , you know? :doh0715:
Did you pull codes yet? :banghead
What was wrong with the old IAC? Sometimes they just need to be cleaned on the valve part, try not to get TB cleaner in the solenoid that's attached because if it hasn't all evaporated you can fry it when you hook it back.
ok ive read the whole code pulling procedure and went and searched for the STI self test in plug and i can not find it anyone know where it is maybe a picture. i went and drove it and it is black smoke out of the tail pipe and no power at full throttle feals like i didnt even touch the gas but its a smokin
Hmmm...mine is an 88 and the STI plug is right near the fuel relays are. That is on the drivers side on the inner fender and if yours is still stock, I would say check for a Triangular shaped plug. Should be around the Air box.
Again, I am unsure since yours is an 86...but should be there. Mine is grey colored. Look good, it will be a single plug.
First you can go to Ryan McCromick's site www.fordfuelijection.com he is Fireguy50 a FSB member, the site has a picture of what the plugs look like.
On my 86 they are located on the right inside fender liner area off the wiring loom behind the EGR solenoid reservior, that's the black plastic half a box which sits behind the battery. One is a red and the other is tan, oddly shaped.
There are numerous threads on "how to" pull codes using a number of tactics. I have a Ford Code Reader with book that just plugs in but do the "search" and see what you find.
Check the fuel pressue. I had a 88 F150 that smoked really bad. I thought the motor was toast found out after I sould it that it had a defective fuel preasure regulator. cheap 45 dollar fix. what it does is put to much fuel in the cylinders and washes the oil out causing it to smoke. get it fixed asap.