Project Tin_Can - b8 SOHC install

[Festiva_tunner]

Day 3 ran through to Day 4
Status still no go details later

[Zanzer]

Keep your chin up bro! Hope all is going well :thumbup:

[Pu241]

Tunner, I hope Muscle_Car1 was of some help other than your personal secretary!
Update us when you can, or call me and I'll post the updates for you.

Kemp, can you post any updates, since you were/are there?

[lanemeyer14]

Can't wait for pics and updates. Good luck bro!

[Festiva_tunner]

Almost four its dumping fuel in getting spark and huffing nicely but it still wont start

If it would start and run everything else is ready to go

[Zanzer]

So you've got fuel, air, and spark but no start?

Maybe double check the timing/distributor/firing order? You using the B3 or B8 VAF? (just thinking out loud here).

[Festiva_tunner]

I'm getting fuel air and spark I'm using the b8 air flow and computer firing order us correct and so is base timing advance isn't making any difference one way or the other
Fuel pump is engaging disty is clean I've double checked my vacuum and electrical connections the only thing I'm not using is the idle air bypass valve which is capped

[Zanzer]

You may want to get that working. IIRC the ECU opens it for cranking (on a Ford anyway...Mazda may be different).

EDIT: Found this for you.

It doesn't get much easier; this mounts on the side of the throttle body. Air is allowed in from in front of the closed throttle body, and bypasses the throttle body plate. The air is then released into the open intake track flowing directly to the cylinders. The whole idea behind this is simply a way for the computer to give air to the engine without needing a driver. The IAB is not opened like door half way, its either open or closed completely. The EEC sends many pulses per second to flutter the IAB open and closed. It flutters so fast that you should notice any RPM fluctuation with a functional IAB. This fluttering is called duty cycle, when it's calculated a percentage of on time. So when the IAB is off it is at 0%, when it is fully open it is at 100%, and any RPM in-between.
There are 3 main needs for the IAB and a fourth that is a debate.


Starting:
•The engine requires an unrestricted amount of air to start, so EEC opens the IAB 100%.
•As soon as the engine RPM self sustains and begins to stabilize we now need air to Idle.



Idle:
•Idle is more complicated than the word implies.
•Idle needs to be smooth and stable.
•Idle is increased if the engine is cold to help warm up.
•Idle is increased if the engine is overheating.
•This increases the speed of the water pump to flow more coolant to the engine and radiator.
•This speeds up the speed of the radiator fan improving cooling.
•Idle is increased if there is a high load on the alternator.
•Idle is increased if there is a pressure spike in the power steering.
Deceleration:
•When you take you foot of the pedal the IAB is at 100% to prevent stalling.
•As the engine returns to idle speeds the IAB lowers the duty cycle to keep the RPM stable.
•When the vehicle comes to a stop the IAB is now controlling the Idle.



Full Throttle:
• The IAB does opens 100% at full throttle. But the debate is if air flow increases.
•Air now has the option to entering the full open throttle body or the IAB.
•Air diverting through the IAB would disrupt the main air flow path through the throttle body.
•I haven’t seen any flow bench test data to suport this.
•You do have “possibility” for higher flow, but it's more violent and turbulent now.

[Festiva_tunner]

Greg was saying he never had it connected on his b8 so I don't know

[Zanzer]

OK...he has more experience with these so he won't steer you wrong. I'm still just a "grasshopper" when it comes to the B engines

[thered56]

I hope you get it going smoothly. I've had the same problem when pulling the CV axles. T'was much a pain in the rear.

[muscle_Car1]

Yeah I left yesterday morning @ 6am after a 19hr car labor session. Wasn't working when I left. Slept & now am camping.

[eurotiva]

Try opening the throttle just a bit while cranking. With the ics capped you will need to turn your idle screw(under little black cap on throttle body) counterclockwise a turn or so.

[Festiva_tunner]

OK plays with the timing and the idle air and got it running went to drive it and it blew the main fuse checked all connections and looked for shorts and determined that it was drawing more with the bigger alternator and extra wire with the battery in the back. I also wound up leveling the air flow sensor out and that helped. It doesn't want to idle even after its warm it backfires and shuts off then it doesn't want to start basically I can't get it started with out a battery charger on it. And I replaced the starter last night after it burned up from all the cranking the past few days.
Part of me wants to seriously sell this thing with all the trouble its been.
So far it has had all of the sensors swaped out the computer changed the air flow changed the intake reconfigured a new starter new injector prints which decided to go one by one and I've had the plugs in and out so many times trying to free up the rings
But I got to say it sounds nasty and for the 200 feet I actually got to drive it I liked it.

[FB71]

Sounds like you're making some progress. Sorry I couldn't be of more help.