STILL have a dead cylinder... need help!

[danielhv]

Im at a loss. Has a miss when running, narrowed it down to the #7 cylinder by pulling the plug wire and noticing no difference in idle or reving, also pullled plug and it looked a little wet, but didn't smell like gas, possibly oil. Compression test showed 150psi. Also checked temp of manifold coming out of that particular cyclinder and its ~200 degrees cooler than the others. Just changed out the fuel injector, same issue. Checked continuity from the injector wire all the way back to the ECM plug, both wires are good. What else is there?!

87 GT btw, the non-HO version for some reason if that matters.

[Blackpony]

have you changed plugs wires cap?

[danielhv]

have you changed plugs wires cap?

yes, here is a list of what has been done:

plugs
wires
cap
rotor
IAC
TPS
Timing @ 12*
2 fuel injectors

[greenbullitt]

get a noid light. couldve dropped an injector driver in the ecm. also you need to check resistance of those wires. do you have the common power at the injector? like I was saying, grab a noid light. Ive even used a 194 bulb to simulate one.

[psdtech]

get a noid light. couldve dropped an injector driver in the ecm. also you need to check resistance of those wires. do you have the common power at the injector? like I was saying, grab a noid light. Ive even used a 194 bulb to simulate one.

I have one of those rigged up to a mini fuse that I use as a noid light

[danielhv]

get a noid light. couldve dropped an injector driver in the ecm. also you need to check resistance of those wires. do you have the common power at the injector? like I was saying, grab a noid light. Ive even used a 194 bulb to simulate one.

Ok, just made a noid light from a 194 bulb, plugged it into a good injector so I knew what to watch for, got a pulse... plugged it into #7, and nothing... Tried flipping the bulb around, still nothing...

So I guess this means the ecm? Any way to fix it or just replace it?

[greenbullitt]

Ok, just made a noid light from a 194 bulb, plugged it into a good injector so I knew what to watch for, got a pulse... plugged it into #7, and nothing... Tried flipping the bulb around, still nothing...

So I guess this means the ecm? Any way to fix it or just replace it?

ecm or wiring. id replace if ecm

[danielhv]

ecm or wiring. id replace if ecm

I'll re-diagnose the wiring. Im using a DVM to check to make sure it has a good connection (you know the mode where it beeps if the + and - connect. I have one end in the injector plug, and the other end in the pin hole of the ECM plug. I get a beep, so I know there is no disconnect. I tested both sides of the plug this way. Is there another method to test to ensure the wiring is good or is that sufficient? You mentioned resistance earlier, I assume that would be the ohms? What is an acceptable range? And do I test in the same fashion as described above?

[G..]

I'll re-diagnose the wiring. Im using a DVM to check to make sure it has a good connection (you know the mode where it beeps if the + and - connect. I have one end in the injector plug, and the other end in the pin hole of the ECM plug. I get a beep, so I know there is no disconnect. I tested both sides of the plug this way. Is there another method to test to ensure the wiring is good or is that sufficient? You mentioned resistance earlier, I assume that would be the ohms? What is an acceptable range? And do I test in the same fashion as described above?

If you have the same firing order that it was factory you need to change to the non HO firing order . firing order is different

[danielhv]

If you have the same firing order that it was factory you need to change to the non HO firing order . firing order is different

Already done.

[majorownage]

Kinda dumb but...have you made sure you even have spark?

[danielhv]

Kinda dumb but...have you made sure you even have spark?

Yes, saw it AND felt it...

[greenbullitt]

Kinda dumb but...have you made sure you even have spark?

why would it matter if the injector isnt firing?

[majorownage]

why would it matter if the injector isnt firing?

Me<reading

[danielhv]

replaced ECM, runs like a champ now. Wish I had thought of that first... oh well.

Thanks for the help gentlemen!