82 FI Spider intake issue

[BammBamm]

So my 82 has come along way. I built a new engine and have installed. It seemed everything was ready to start. It kinda fires up but is real low rpms and dies. Pumping the throttle while starting makes no effect. Where should I start?

[RRoller123]

Distributor Timing is a likely culprit.

[GeorgeT]

When you start it, will it continue to run if you use the accelerator to feed more fuel? If so, you may need to adjust the idle screw. Pumping the throttle on a FI car does nothing, on a carbed car it will pump extra fuel into the intake but the throttle on an FI car only changes the air flow.

[BammBamm]

when i move the throttle it has no effect. it is idling at about 500rpm so it dies quickly. sometime i am getting a backfire. If the fuel is not increased wehen the throttle is moved then it has to be a injector control issue. Right? how do I start checking all the components? I built the new engine but i dont know if all the other parts worked before i installed them. I know the car was running a year ago.

[76was124]

Something looks odd with your AFM, but it's hard to see on the left edge of the picture. Is the cover off it?

[BammBamm]

its missing the air cleaner box and the cover need to be glued back on. The update so far is the coolant temp sensor checks out. The afm also checked out by checking ohms at ecu. checked wiring between ecu and throttle plate sensor. the cold start injector is operating which is why the engine is firing a little bit. The main injectors are not firing. I have fuel pressure ( i had a leak that was spurting). I disconnected the throttle plate sensor and it had no effect. How do I test the throttle plate sensor?

[rjkoop]

its missing the air cleaner box and the cover need to be glued back on. The update so far is the coolant temp sensor checks out. The afm also checked out by checking ohms at ecu. checked wiring between ecu and throttle plate sensor. the cold start injector is operating which is why the engine is firing a little bit. The main injectors are not firing. I have fuel pressure ( i had a leak that was spurting). I disconnected the throttle plate sensor and it had no effect. How do I test the throttle plate sensor?

I had a problem with the adjustment on my TPS. Here's my post (last one with video). Hope it helps.

http://www.fiatspider.com/f15/viewtopic ... 30&t=26724

[spider2081]

How did you connect the grounds to the throttle body after painting. There should be ground wire under the back 2 bolts that hold the throttle body to the manifold. Also there is a ground that fastens to the back cover for the exhaust cam. All these grounds are important for the engines operation. If the surfaces are painted the grounds may not be there

[76was124]

If it's not this:

How did you connect the grounds to the throttle body after painting

Then another possibility....Does your tach work right, not jumpy? Your ignition pickup wire looks nice and clean....is it new? If so, is it properly gapped and the magnet correct side up?

[wizard124]

Distributor Timing is a likely culprit.

Rotate the distributor slightly, see if she runs better

[BammBamm]

the grounds are good. I have followed the instruction on this link.
http://www.njfiats.org/joomla/images/st ... BoschL.pdf
all the sensors check out, temp sensors, throttle, air flow and the double relay also checks out. The book says the next thing is to replace the ECU. The injectors do not fire so it's not timing. Any other ideas? Does anyone have an ECU i could borrow to verify?

[BammBamm]

is there anyone i can send my ecu to have it checked out?

[BammBamm]

my ECU is a bosch 0 280 000 190. i am seeing an bunch of ECUs for spiders with a number of 0280 000 223.
http://www.ebay.com/itm/0-280-000-223-E ... YE&vxp=mtr
Is it an updated model? Can i buy it and expect it to work?

[76was124]

The injectors do not fire so it's not timing.

Maybe someone more knowledgeable can chime in, but I remember something about if the ECU doesn't get a pulse from the ignition, it won't fire the main injectors. Also, from what I hear, ECU failures aren't very common.

[spider2081]

I am not an expert on the FI system.
There are a few different manuals I think do a pretty good job of explaining its operation. Here are a couple links.

http://www.njfiats.org/images/stories/s ... manual.pdf

http://www.mirafiori.com/faq/fiatFI_may2002.pdf

Yes the ECU does need a signal from the ignition to time the injectors. The coil should have 2 brown/white wires on the "D" terminal. One is for the Tachometer the other is for the ECU. All the injectors fire at the same time. Interestingly the ECU grounds and the Temperature sensor ground wires make their grounds with two of the bolts holding the throttle body to the intake manifold. The ECU + voltage and the injector + voltage are supplied through the dual relay. So if the relay is good when the fuel pump is operating the ECU and the injectors should all have voltage to operate.
The fuel injectors can get stuck from sitting. Although its unlikely all 4 would have this happen have you applied voltage and ground to each injector to see if they click?