SR Help

[fogls]

Ok long story short a while back I wired up a SAFC NEO to my car. S14 with S13 Sr20det. I didn't realize it at the time but I had the wrong pin out for my ecu. Come to find out I had the power wire for the NEO hooked up to the number one cylinder signal wire. Car went in to limp mode. I got it back out got rid of the NEO and found out I had lost spark to cylinder one. I have now replaced the entire engine harness with a brand new Wiring Specialties harness, replaced the coil on cylinder one, and tried four different ignitor chips. The ignitor I bought off ebay gets hot and the car will not run on its own. I was given a different chip and the car runs the best on that one. will idle all day long but definitely still only on three cylinders. The original chip that was on the car makes the car run a little rough but it will stay idling. with any of the chips I can unhook the coil for cylinder one at idle and nothing changes. I pulled the coil and checked I am definitely not getting spark there. I am getting fuel as I checked that as well. Compression is 1-4 138 138 140 140 so compression is not an issue. Car is driving me nuts. Also my wideband reads 14.8 while car is running all the time. Never moves. used to bounce all over before this happened. Any help is greatly appreciated.

[fogls]

Here is my current update on the situation:

Ok so I am back out messing with my car and I am at a loss. Still doesn't seem to be running right. I pulled the plug out of cylinder 1 and put it in the coil and cranked it over. It is definitely getting spark now. Also when I pulled the plug it was a little wet like some gas had been getting in there. I unhooked each injector one at a time to see what that would do. When I unhook 1 nothing changes. when I unhook 2, 3, or 4 it starts to die out. If I unhook the coil for cylinder one nothing happens but the car starts to die when I unhook 2, 3, or 4. Also the whole time this is going on my wideband is stuck on 14.8. It used to bounce all over the place before this. I did also get the brand new harness and another ecu I picked up hooked up in the car. The car is now running rich as hell. It will easily smoke out my garage from just a few minutes of tinkering with it. I also tried spraying the runners of the turbo manifold to see if they were getting hot and 2, 3, and 4 all burn off and steam immediately and cylinder one has nothing.

Anyone have any ideas? I am losing my patience with the car.

[Kingtal0n]

Try a new ECU.

also, your wideband will not read right unless your engine hits on all cylinders. sounds like the wideband wires came loose.

[fogls]

The update was with another ecu in it. I am going to check timing next and also see if it is throwing any codes. Thanks for the help though. I appreciate it.

[Kingtal0n]

If its running on 3 cylinders, then,


1. ECU
2. Wiring harness
3. coilpack harness
3.5 Spark plug
4. coil pack
5. igniter
6. igniter wiring
7. harness wiring
8. coilpack ground
9. cylinder compression
10. cylinder leakdown (see #9)
11. CAS
12. Fuel Injector
12.5 fuel injector O-ring
13. physical obstruction before the cylinder
14. physical obstruction after the cylinder
15. valves not opening fully (see compression)


No particular order

diagnosis:
first install all new spark plugs
check compression.

If compression is good, and spark plugs are brand new, verify your grounds.
verify spark.

Disconnect the injector and crank. Smell for fuel in the cylinder. If you smell fuel while the injector is disconnected, the injector is leaking fuel into the cylinder (problem solved, replace injector/o-ring)
If the cylinder is bone dry with the injector disconnected, re-connect the injector and crank again. If it now gets fuel (and previous had compression and spark) it should fire. Unless the ECU is bad, or the injector is the wrong size.

[bmitchell_ga]

can you swap your number one cylinder coil with another and see if number one starts firing. You might have burnt out a coil.

[fogls]

I will try disconnecting the injector and cranking and see what that does. See if that gets me anywhere.

So far since this happened I have replaced the ecu, ignitor chip, complete wiring harness, and coil for cylinder one with a brand new one from Nissan. I am positive I am getting spark and fuel in that cylinder and a compression test was spot on.

[fogls]

If its running on 3 cylinders, then,


1. ECU
2. Wiring harness
3. coilpack harness
3.5 Spark plug
4. coil pack
5. igniter
6. igniter wiring
7. harness wiring
8. coilpack ground
9. cylinder compression
10. cylinder leakdown (see #9)
11. CAS
12. Fuel Injector
12.5 fuel injector O-ring
13. physical obstruction before the cylinder
14. physical obstruction after the cylinder
15. valves not opening fully (see compression)


No particular order

diagnosis:
first install all new spark plugs
check compression.

If compression is good, and spark plugs are brand new, verify your grounds.
verify spark.

Disconnect the injector and crank. Smell for fuel in the cylinder. If you smell fuel while the injector is disconnected, the injector is leaking fuel into the cylinder (problem solved, replace injector/o-ring)
If the cylinder is bone dry with the injector disconnected, re-connect the injector and crank again. If it now gets fuel (and previous had compression and spark) it should fire. Unless the ECU is bad, or the injector is the wrong size.

I disconnected the injector and tried that today. Before I did this or started it I pulled the plug and it was damp. I then started it and ran the same nothing changed. I pulled the injector clip and cranked it then pulled the plug and checked it again and it was wet and a little black. I am definitely getting spark and fuel now. It is almost like it is off timing and sparking before fuel gets sprayed into the cylinder.

[fogls]

Ok so today I got code 13 off of the ecu. Coolant temp sensor. I know this will cause the running rich issue. Will the Sentra SE-R sensor work. I am almost positive I replaced it once not long ago. I also read an old thread on here from a google search that said it depends on which ecu you have. I have the E5 ecu. Could this also cause my cylinder to not fire like it has?

[fogls]

Looks like I may have figured it out tonight. A friend came over and we were going to do another compression test on cylinder one just to be sure. Compression was ridiculously high. Looked down in the cylinder and there was a puddle of gas in the cylinder. So somewhere between when I lost spark and trying to diagnose that problem and when I swapped the injectors between cylinders, the cylinder flooded and wasn't allowing the spark to ignite. Got the gas out and the car started right up and ran better than it had since I have owned. it. So next up will be new plugs and cts and it looks like I will be ready to go. Thanks for all the helpful info.