2jzfc

Fired my 86 NA up today for the first time after the engine sat for 2 years. It took it a while to start up, but eventually fired. I had to keep idle at 1k rpm for a few minutes while it warmed up a bit. And adjusted the idle screw on top of the UIM to get it to idle around 900rpm on it's own. But after a few minutes of idle and me adding coolant while it circulated, it wanted to die. Also I was not able to get it to rev past 3k rpm either just bogged down. I do have a pretty nasty exhaust leak at the header flange I need to address. I hope the nuts just need tightened down more, RB header with a new OEM gasket.

Here are two videos I took as it warmed up...

http://vid88.photobucket.com/albums/...psqdboy2j2.mp4

http://vid88.photobucket.com/albums/...pse0eftf8k.mp4

2jzfc

OK more info:

I fixed the exhaust leak for starters, and after letting the car sit for a while I went out to start it up again. Fired right up no issue, I let the car get warmed up and the thermostat opened up and I was able to finish topping the coolant off. The "add coolant" buzzer finally went off!

At this point the car is idling at around 900 rpm with out hesitation and sounds pretty good. But once it gets to operating temp it bogs down and eventually dies if I don't manually keep the RPM up.

Also if I quickly rev up the engine it falls on it's face and chokes, like it's starving for air or fuel not sure... But if I slowly raise the RPMs I can get to about 3500 RPM before it chokes and falls on it's face...

I don't think the engine is not getting enough air, if anything it might not be getting enough fuel. I'll try and see if I can post a video later of what it is doing if that will help...

2jzfc

Here is a video of the engine starting up, dying, and not wanting to rev past 3500RPM...

I went ahead and switched the vacuum line from the FPR from the vacuum source below the fuel rail on the LIM to the back of the barrel on the UIM. That didn't seem to change anything.

Also rats nest is removed, all new vacuum lines, all new fuel lines, new fuel filter, new spark plugs (NGK) new plug wires, new water pump, new thermostat.

Also I wired my 5th and 6th ports open because I don't have the air pump and my actuators were frozen solid...

http://vid88.photobucket.com/albums/...psbhsl9u6r.mp4

Aaron Cake

iTrader: (1)

Adjusting the idle screw is generally a bad idea randomly. Now you'll need to readjust once things are running correctly using the proper setting procedure. But it will be difficult to get things running properly if the screw has been touched.

Now, the car has sat for over 2 years? The entire fuel system is contaminated and must be flushed. Clean the tank, flush out the lines, replace the fuel filters and have the injectors professionally cleaned/serviced.

welfare

as mentioned, set the idle screw to factory spec. messing with that is just covering up the real issue. you want all your adjustments set at spec to try and find what's going on. 2year old gas is not going to burn well. lucky for us mazda incorporated a drain plug on the fuel tank. fresh fuel, maybe a little additive, and set everything to spec. definitely check your tps setting. when you mess with the fast idle screw, you are supposed to readjust tps. set it all to spec, then perform tps adjustment procedure

2jzfc

The car itself has only sat for maybe 10 months with no engine in it. The engine was properly setup and stored away by the Rotary Dr. in Neosho, MO for about two years. Before I ever tried to fire up the engine I replaced the fuel filter. The amount of gas in the tank didn't even register on the fuel gauge so I did put fresh gas in the tank.

As for messing with the idle screw I'm trying to find the proper procedure to reset the screw in the FSM I downloaded, but can't seem to find it. Any links or ideas where I can find the procedure?

2jzfc

Also as far as I know timing has never been touched on this engine, but could timing be an issue as well?

2jzfc

I started a new thread to get attention for the specific issue...

But the wires for my TPS on the engine harness broke and I redid the spades inside the connector. I'm sure I have them crossed that would deff give me the issues I'm having right now. Now I just need to figure out how to re adjust the idle screw...

2jzfc

Ok great news... I swapped two wires around on the TPS wiring and BAM! It's revving through the whole range! But it now wants to flat out die and I'm 99% sure it's because I've screwed the idle screw up and need to re adjust everything.