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Hi guys , I'm having a weird idling/running problem on #1 cylinder. When I pull the #1 injector wire off it makes no difference in the idle. I can do this on all other cylinders and you can feel/hear the change in idle. I've swapped injectors with #2 and it runs the same so this eliminates a faulty injector I think. I've done an ohms test to check for a broken wire from a31/B134 and there is no break. I also pulled the spark plug lead and grabbed a spare plug to run it on the engine and you can see the spark jumping the gap so I assume this is happening in the head also.

I also just swapped over the CTS just in case and this seems to not make a difference with the black smoke at idle and while blipping the throttle. I'm assuming it's running this rich due to my lack of change from #1......maybe just straight fuel going out the exhaust.

My wiring I've been using in my conversion is this one--> http://www.northursalia.com/modificatio ... /link5.pdf

Any help to eliminate items or problems would be greatly appreciated

Next:Compression test, pull the plug and have a look at least. Maybe swap plugs.
A vacuum leak at the port or injector can also cause a dead hole at idle.

180psi on problem cylinder. Next I swapped the wiring from #1 to #3 and I can make this happen on the #3 cylinder now so it must be the wiring. I've triple checked it and absolutely no breaks in the two wires. I can see voltage there when it's running and when I put the LED MAC tools test light in there it strobes green and when you swap pins on the test light it lights up red so it must be working.

Just found this while surfing and looks to be really close to the same symptoms I've been chasing.

Legacy And Impreza Engines With
No Injection Pulse #1 Cylinder
Built into the fuel injection control
unit is logic that will shut off the #1
injector if the computer believes that it
can no longer control the Idle Air Control
Valve. Remember this design characteristic
if you are trying to diagnose a “hard”
code for the Idle Air Control Valve or a
dead miss in the number one cylinder
due to no injection at idle. A problem in
the Idle Air Control Valve circuit may be
responsible. (Component testing shows
that it most likely is not the valve itself.)
Also, if the computer is deprived of its
“back up power supply,” some computers
will generate a false code for the Idle
Air Control Valve and kill the injector for cylinder #1. The pin location of this
power supply can be found in the Control
Unit Module I/0 Signal pages of the
appropriate Service Manual.

Decided to go Megasquirt late in the summer so lots of changes etc.

New intake done with hoses for the boost controller and the block (AOS.Air oil separator). No MAF (mass airflow sensor) on this grey pipe now.



Took the crossover manifold off and took the old coolant sensor out , drilled and tapped her for a 3/8" NPT for the new GM style sensor.



Ebay cheapy relays for fans(2),fuel pump and main relay.



Block off plate for the idle air valve. I could run one but decided not to.



And my 6yr old little helper blowing off the grinding dust after cutting off the spark plug lead holders, single coil pack mounts and ground bosses. I'm running CNP (coil near plug) now and the 4 coils are from a Chev LS2 engine.

panel,
looking good! looks like its almost ready to roll! you might want to check your email cause i sent you something..

Sweet Panel! Hopefully will simplify the ECU wiring and sensors. Lots of knowledgeable folks on here with setting up the MS. I also used the upper water manifold fitting for a coolant bleed/purge, but kept mine running through the TB back to the reservoir tank. Interested in seeing your CNP solution. Keep the updates coming!
Jeff

GS guy wrote: Lots of knowledgeable folks on here with setting up the MS.

Thx , been running it since 2005 om my 2276T and then tried to go OEM 3 yrs ago when I went Subaru. I'm glad to be back

MS firmware and tuning tools have come a LONG way...
(MS1 kinda ran out of program space though, not much change there)

Awesome to see Panel! Im in the process of doing a subaru in my squareback as well, then after that maybe my bus.....

Any more progress?...

Thanks for the interest. I've been away at school for 7 weeks and now back for 2 months but away again for 3rd yr after that. So I'm really trying to line up stuff. Also working on a single wheel utility trailer at the same time. But before that my harness guy at work who volunteered to make it has been away also for a couple of weeks. Hoping he comes over late this week to terminate the harness which is all in the bus and laid out. He's also doing some board mods for me from parts from the Dub Shop.

On the radiator side of things I'm almost done. Just finished off the brackets that will be mounted to the existing ones from my first attempt. Ignore the -12 JIC's, they will be cut off.

Cool, right on panel! I might do this on my bus, but mine is a double door panel​ so it has a belly pan.

Any progress is good progress

I've seen 2 roof top rad conversions now. One was in an old school trunk.