Another KA24DE Crank but no start.

[PoorMans180SX]

Let me first tell you how the issue started.

My car (1992 Nissan 240SX) Starting misfiring at about 3,000 rpms. Gradually it just got worse and worse till it wouldn't drive. Now it won't even start. Crank, but not start.

I checked spark and it appears that I have it (checked with crappy Harbor Freight spark checker).

I have fuel through the fuel filter, and I can hear the fuel pump if I put my head down by it. Though I can't really smell it in the combustion chamber when I take the spark plugs out.

So I used a NOID light and none of my injectors are firing. Replaced the MAF because I was hoping that's what it was, but nothing. I'm thinking ECU? Can anyone think of any other reason?


EDIT: Solution: My ECT sensor was toast and when I replaced the distributor I put it in a tooth off. :duh:

[PoorMans180SX]

Anyone think of anything else besides the ECU?

[PoorMans180SX]

Anyone, Seriously? I'm low on cash and would like to fix this now, I need a car to drive!

[Howlermonkey]

If you get the two second prime from the fuel pump when turning on the key but don't get fuel pump operation beyond that, it is very likely the ecu is not seeing a good signal from the crank angle sensor.

Since the sensors are in bolted to a vibrating and heating/cooling engine, it most likely one is at fault.

[PoorMans180SX]

Do S13's have crank angle sensors? I was thinking they didn't?

[project-D180]

check your timing and compression will cause a no start..jus had that problem

[PoorMans180SX]

Thanks, but this isn't a rebuild or anything. It just died on me and I can't get it to restart. Timing is fine.

[SleepR 240sx]

Yes, s13's do have CAS's. However If i remember correctly it will not even crank if the CAS is dead.

Take off one of the fuel lines and see if any gas is getting up to the fuel rail. Also can you hear the fuel pump priming the system when you turn the key to ACC? If not could have a bad fuel pump.

If gas is getting to the rail and the injectors aren't pulsing then pull the fuel rail off (4 bolts, 5 minutes) apply 12v and a ground to each injector and see if they fire, a little gas should come out or you can feel the piston moving up and down slightly if you have your finger on it. If they are firing outside of the car but not when plugged into the harness than it is more than likely a harness issue. You probably aren't getting the 12v power to the injectors. Could be a short in the harness. I had the same problem, where a heater hose had a hole, which leaked on my wiring and shorted out the 12v wire. Sucked but just pulled the harness out to find it.

Check EGI control and EGI pump fuses.

[PoorMans180SX]

Thanks man, I think I'll test the injectors and such.

[SleepR 240sx]

Let me know what you find with the injectors.

[PoorMans180SX]

I tested the injectors. They all fired. So I pulled the wiring harness out and traced the power wires. There are no shorts or broken wires. I even tested the resistance; ~.3 Ohms from the injectors to the ECU. Obviously that's not a problem.

Also, my EGI stuff is gone. Taken out by the previous owner.

[SleepR 240sx]

You don't have either an EGI fuse or an EGI pump fuse? Well they are actually relays but whatever. I'm not sure how the car is wired than if it is running without those relays.

[PoorMans180SX]

The relays are there.

[let5l1de]

Quick pointers

1. try another ecu. Just barrow one from a friends running car.

2. Swap the coil (could have a weak spark)

3. new spark plugs (might be fouled out)

4. cap & rotor.

5. fpr could be bad

gl w/diagnosing

~mario

[SleepR 240sx]

As far as testing out the ECU test I would test out YOUR ECU in someone else's car so that if you had a short in your wiring that burnt your's out you won't do the same to a friends.

[PoorMans180SX]

I switched the ECU for a known good one. No one around here owns a 240SX.

Plugs are good. I checked.

I've already replaced the cap and rotor.

How do I test the FPR? I don't have a fuel pressure gauge. That's a good idea though!

[SleepR 240sx]

What you can do to test the fpr is take a vice grip and clamp the line going from the fpr shut. This will force there to be pressure in the system even if the fpr is bad. See what you get.

[PoorMans180SX]

Thanks! Trying that tomorrow.

[PoorMans180SX]

Will the injectors not fire if there is no fuel pressure? Because they're definitely NOT firing. Not even dribbling. I pulled them out of the manifold and cranked. Nothing.

[greenman100]

I tested the injectors. They all fired. So I pulled the wiring harness out and traced the power wires. There are no shorts or broken wires. I even tested the resistance; ~.3 Ohms from the injectors to the ECU. Obviously that's not a problem.

Also, my EGI stuff is gone. Taken out by the previous owner.


Will the injectors not fire if there is no fuel pressure? Because they're definitely NOT firing. Not even dribbling. I pulled them out of the manifold and cranked. Nothing.



???????????

[PoorMans180SX]

I tested the injectors by jumping them to the battery. They all fired, AKA their all good injectors. But when hooked up to the wiring harness, they don't fire. At all.

[PoorMans180SX]

I'm looking at the FSM, and it says if I pull the distributor out with the Crankshaft position sensor still plugged in (it's in the dizzy) and rotate the gear on the end (with the key in the ON position) then my injectors should make an "operating sound" Obviously mine doesn't.

It says to check the injector harnesses, but mine are good. Does that mean that both the Distributors I have are bad?

[PinkPanther]

sounds like you narrowed your problem down to a bad crank angle sensor. The car will still crank with a bad sensor but the computer doesn't know when to fire the fuel injectors without it. I doubt you have a oscilloscope to test the sensor so you may need to try a working one. If that doesnt solve your issue then suspect the crankshaft position sensor wiring harness. Also out of curiousity, did you check the injector grounds on the fuel injector wire harness?

[PoorMans180SX]

Yes, I checked all the grounds. Guess I have to get a new distributor.

[Mn240sxGuy]

Where is the crankshaft sensor position anyways, because im having a similar problem too, but its just that my fuel pumps and i get fuel, and also it cranks but it doesn't start. im thinkin its the CSP, anyone know where its located???

[M11's]

have a very similar problem. I have fuel and spark but still not starting.

[jdmdrifter18]

did anyone find out where the cas was at?or did anyone solve this problem?