Need Help! No spark!

[Jagstang]

Alright, I have just had an S14 Kouki SR engine swapped into my 1995 240sx, and for the passed few days now, couldn't get it to start (only cranks). We checked everything, and the fuel pump is working, and there's power to the Crank angle sensor, and Ignitor etc. There's just no spark (cranked the engine and touched the spark plugs to the intake, 0 spark).

I just installed another CAS (since the one that came with my engine had physical damages on the casing), and unfortunately, that didn't do anything. And today, I tested out an ignitor off of an S13 SR20DET, and that didn't work.

My next thing to test is the ECU, it could be the reason for why my car isn't getting spark.

If anybody can help me out here, that would be greatly appreciated, thanks in advance.

[kouki munster]

Are the coil packs grounded properly? There is a ground wire that comes out of the coil pack harness at the back of the head, make sure that you have that securely attached to the head.

[Jagstang]

Are the coil packs grounded properly? There is a ground wire that comes out of the coil pack harness at the back of the head, make sure that you have that securely attached to the head.

Hey, thanks a lot for the input, but we already checked that ground, and it was tightened down properly.

[asoomal]

Check voltage drop.

Neg batt to coil ground.

[kouki munster]

Seems like its time to break out the fsm and go through the diagnostics procedures for a no spark situation.

[good2go_240]

Check every wire dealing with spark, i had a problem just like this and it ended up being a small tear in two wires going to the ign coil and they were shorting each other out.

[costa_rican13]

Ignition control module? And yes check every wire. On my 93 ka. My ignition control module ground wire broke and this somehow shorted out my module. $220 later problem fixed. Been driving since.

[Jagstang]

Alright thanks a lot everyone for the useful advice. But today I was testing the spark plugs, and realized that there's some sparks in each spark plug. . . And there wasn't any the other day. . . So I took a jumper cable, and connected it to the negative of my battery, and connected the other end to the block and started it. . .

BOOM! It actually started up! But after 3 seconds of bad idle, it died. I managed to capture a video, and during the video, the gas pedal was applied to keep the car from dying. But you can see how the idle is rough as hell.

Here's the video.



Anyways, I think the timing is way off, since the exhaust manifold/downpipe etc was hot as hell after that video was done. . . What do you guys think, if I correct the timing, do you think the SR will run perfectly?

[kouki munster]

There is only one way to find out, snag a timing light and get busy.

[Jagstang]

There is only one way to find out, snag a timing light and get busy.

K, besides timing issues, is there anything else that causes that kind of eradicated idling/stalling issues?

[asoomal]

Lots.

[Lobo240sx]

There could be multiple issues. Look for boost/air vacuum leaks, Throttle position sensor voltage, Timing, wiring, coilpacks, etc. You aren't driving a simple NA KA anymore. Get busy.

[Jagstang]

There could be multiple issues. Look for boost/air vacuum leaks, Throttle position sensor voltage, Timing, wiring, coilpacks, etc. You aren't driving a simple NA KA anymore. Get busy.

Alright, eureka! We realized that the Cam Angle sensor was installed a little off, so we adjusted it, and now the car start up. Here's the problem tho, it idles for exactly 2 minutes a 15 seconds, and suddenly stalls. We're thinking it's either the ECU, or the MAF sensor.

Theory for why the idle suddenly stalls after 2 minutes on every start up probably occurs from the engine running too rich over that short period. Then again, the ECU could also be in safe mode? Any help would be greatly appreciated, thanks in advance.

[ciscos13]

check your wiring. who did your wiring? also check the ground that goes from the engine to the firewall.

[Jagstang]

check your wiring. who did your wiring? also check the ground that goes from the engine to the firewall.

Wiring was done by a local SR wiring guru. Everything seems to be working in terms of wiring (everything gets power). I just thought about a few more things. I realized that I forgot to adjust the Idle Air Control Valve, maybe that's causing it to stall out? Or have a high idle?

Also, another thing I realized, my MAF sensor is extremely close to the compressor (about 8 inches away). I purposely cut the rubber hose that connects to the MAF sensor so it can fit behind the intercooler piping, you think there's too much turbulence from the compressor? Might be messing with the MAF sensor?

[asoomal]

There could be multiple issues. Look for boost/air vacuum leaks, Throttle position sensor voltage, Timing, wiring, coilpacks, etc. You aren't driving a simple NA KA anymore. Get busy.

Alright, eureka! We realized that the Cam Angle sensor was installed a little off, so we adjusted it, and now the car start up. Here's the problem tho, it idles for exactly 2 minutes a 15 seconds, and suddenly stalls. We're thinking it's either the ECU, or the MAF sensor.

Theory for why the idle suddenly stalls after 2 minutes on every start up probably occurs from the engine running too rich over that short period. Then again, the ECU could also be in safe mode? Any help would be greatly appreciated, thanks in advance.

How are the plugs?

[Jagstang]

check your wiring. who did your wiring? also check the ground that goes from the engine to the firewall.

Wiring was done by a local SR wiring guru. Everything seems to be working in terms of wiring (everything gets power). I just thought about a few more things. I realized that I forgot to adjust the Idle Air Control Valve, maybe that's causing it to stall out? Or have a high idle?

Also, another thing I realized, my MAF sensor is extremely close to the compressor (about 8 inches away). I purposely cut the rubber hose that connects to the MAF sensor so it can fit behind the intercooler piping, you think there's too much turbulence from the compressor? Might be messing with the MAF sensor?

Ok, I connected the boost gauge, and I'm reading -20 inHg at idle. So I know for a fact that it isn't leaking cause that's how it should be in idle right?

[kouki munster]

Is your ecu throwing any codes?