Jimster480

So I have a built turbo civic using a D16 & some PTE 650cc Injectors. And Recently my car started to become just insanely fuel inefficient. So I took my fuel rail out and my dizzy off and as I spin it, all 4 of my injectors fire at each point. They all fire at exactly the same time. I tried swapping the ECU and trying the dizzy from my other Y8 and its the same thing.
Does anyone know where the wiring is at that would cause this? I do have a resistor box and I wonder if it maybe went bad and is having the power cross over?

doctorake

What ECU are you using?

Jimster480

Chipped P08/P28 w/ Ectune. But even trying a completely stock P06 (the car for sure wouldnt run on this) the same thing happens when i slowly spin the dizzy

Former User

Do all injectors spray continuously or do they pulse on and off in synchrony?

TripleLude

That could be related to the ECU and also the position sensor. If the ECU doesn't know the cylinder TDC, it will fire each injector based on another sensors best guess.

I know OBD0 ECU's that use a CYL sensor and a CYP sensor do this. The CYL sensor times the injectors and the CYP sensor times the spark. If the CYL sensor became disconnected, the ECU would fire 2 injectors for each cycle... or maybe it was all injectors for each cycle. But yeah, it kills gas mileage. It happened to me once.

Since you are probably chipped/tuned, you might want to plug into the ECU and see if it is reading the position sensors correctly.

v8killaz

they are suppose to fire all at once lol

m90polk1

All the sensors mentioned above are within the distributor housing if one was bad it would set a cel ...dont know if u have one? Check out this link maybe help shed some light http://www.hondata.com/techlowohminjectors.html

TripleLude

By default it will throw a CEL, but he has a turbo which means it is probably a chipped/tuned ECU. I don't know what the tuner has going on with it, so I was thinking plug-in and find out.

I've seen MegaSquirt do synchronous injection or whatever with and without an extra sensor. Either way, synchronous injection on a Honda ECU probably means a sensor is not doing it's job. CEL or no CEL. The only other electrical system related would be an injector resistor, but I've never heard of that causing this issue.

Jimster480

They all fire every time i spin the dizzy end. Its at the same exact point. Its not sequential and now they dont spray the whole time.

Former User

During each full revolution of the rotor, do all 4 injectors fire simultaneously 4 times at the proper plug wire positions 1, 3, 4, and 2?

Jimster480

Hmm well yes and no. When I was spinning the end of the dizzy it actually wasn't Consistent on the firing. U think it was more based on the fuel pressure going low and it needing to reprime since it dumps so much fuel that the pressure drops to like 20 or less.

Former User

The more precise and detailed responses you provide, the better chance you will get some help.

The engine still runs fine, right? It just uses too much fuel, so the injectors must be spraying in time, though in synchrony.

Any CEL codes?

Why do you have the distributor removed for the test? Reinstall it and crank the engine. Do the injections now spray individually?

Jimster480

I'll try cranking it with the dizzy still attached. But Yes the engine runs, although sometimes it does missfire some and it just straight dumps fuel. I borrowed a friends wideband and the car stays at 10 most of the time and idles around 10.1. Even under full boost (23PSI) it is like 10.8 and it should be 11.4-11.6. Even cruising on the highway its around 11-12.2 and decel doesnt work at all anymore.

Former User

Check whether the injectors alternately and individually spray fuel with the distributor installed and while cranking the engine.

Your engine is running rich, but there could be other causes if the injectors spray properly with the distributor installed.