SR wont start on it own, but it will start off Starting fluid, then run.

[Csomme]

Like the title says. My SR is having trouble starting on its own. It will start off of starting fluid, and then when the starting fluid is all burned up, it will run off of it's own gas, for however long I choose it to. It will rev up fine, idle fine, do everything just fine when it's running.

However, when I try to start it on its own, not using starting fluid, the starter just sits there and spins the crank. The motor doesn't even try to turn over. I hear absolutely nothing, as far as trying to fire over.

At first I thought it was bad gas, so I completely drained the tank, and soaked up all remaining gas in the tank. It was bone dry. I then replaced the fuel with brand new fresh 93 octane gas.

I've also swapped ECU's, replaced the fuel filter, etc. I'm not quite sure what is going on here.

I have a stock SR blacktop, freshly rebuild, 0 miles, with an AFC neo that has not been tampered with.


Please get back to me.

Thanks, Chad.

[SR20Driftking4lyf]

I had this same problem with my S13 SR about a month ago and I took off my IACV and dismantled it, cleaned it, and put it all back together. Once I put it back on I adjusted to factory specs and it fired right up. In addition I spoke with a local whose SR had the same issue and all he did was take the line the goes from the IC piping to the IACV and sprayed a bunch of brake cleaner in it and got it to fire up and let it burn through all the brake cleaner. After that no more problem........Just a thought! You did say fresh build so not sure how new or if you are even running an IACV.

[Csomme]

Sweet. Thanks for the input, I'll give it a wirl.

[Csomme]

Update, the car will start when I have my foot on the floor(gas pedal) It takes a few tries, but eventually it goes.


Then, I tried the brake clean thing mentioned above, holy shit that smells rough.


Same thing afterwards.

[cotbu]

Update, the car will start when I have my foot on the floor(gas pedal) It takes a few tries, but eventually it goes.


Then, I tried the brake clean thing mentioned above, holy shit that smells rough.


Same thing afterwards.
That's clear flood mode i think, check for leaking injectors or excessive fuel pressure!

[modulation]

That's clear flood mode i think, check for leaking injectors or excessive fuel pressure!

There is no clear flood mode on our cars.

I'd bet $20 it's the opposite, he's not getting enough gas. Why if it was flooded would the starting fluid help?

How about it being one of the following:
1. There is a "starter signal" wire to the ECU, I've read of people doing swaps and forgetting to connect that wire and having the same problem.

2. Have you tuned your AFC at all? I don't know much about piggy-backs but if you leaned it out too much then that would cause similar problems to this.

3. Have you checked your coolant temp sensor? Maybe it thinks the car is warm all the time so your ecu doesn't inject extra fuel to help it start when cold.

[cotbu]

It will start off of starting fluid, and then when the starting fluid is all burned up, it will run off of it's own gas, for however long I choose it to.
My answer is completely feasible, just because there is no code for the procedure he does to start his car does not mean, that it's not clear flood mode. Cause that's what he did.... cleared the flooded engine, by opening the throttle body. Now if starter fluid starts the car and shuts off after the fluid is gone, I would have asked him/her to check something else.
CTS could be an issue, but he/she may or may not have that problem, A code check and others test would have been asked, if he/she has no leaking injectors!

3. Have you checked your coolant temp sensor? Maybe it thinks the car is warm all the time so your ecu doesn't inject extra fuel to help it start when cold.
XD!

Then again this engine has 0 miles it could be anything! grounds etc.
http://i18.photobucket.com/albums/b142/COTBU/STFU.jpg

[Csomme]

Soooooooo. my injectors are leaking as in around the O-rings? Orrrrrrr, like broken leaking?

[SR20Driftking4lyf]

hah yea it smells a little funky...hope you dident do it in your garage, when mine wasn't starting I figured out that just barely touching gas it would fire right up. Thats why I turned to the IACV. Sorry it dident work bro!

[Csomme]

It's alright man, just waiting for someone to answer my leaking injector question.

[cotbu]

complete the leak test first, see if they are leaking. unplug the CAS and or ignitor just in case you turn the key too far. unbolt the fuel rail, careful not to loose the plastic space washers. place a piece of cardboard or towel under the injectors, turn the key on so the fuel pump primes. Do the injectors leak? which one? It's most likely the bottom o-ring, but it could be a stuck open injector(s). replace o-rings, have them cleaned or replace injector(s)

[smoked240]

Have you tried quick starting it? It could be your fuel pump or your fuel pressure regulator. I would first try quick starting,basically you don't let the fuel pump finish it's cycle before you start it. If you just turn it over and start it right away already, then it won't work more then likely. Then I would have it fuel pressure tested. I think I remember a mechanic saying that if it will start on Ether, then it's your FPR, if it doesn't then it's good. But I could be ass backwards on that.

[modulation]

My answer is completely feasible, just because there is no code for the procedure he does to start his car does not mean, that it's not clear flood mode. Cause that's what he did.... cleared the flooded engine, by opening the throttle body.

Some cars have "clear flood mode" which is actually when the ECU cuts the injectors cause it sees the TPS activated. Nissans don't do this.

It doesn't work like that. I put larger injectors on my car and had to tune them, before I tuned for them properly I'd flood the car on start. Even after that if I held down the throttle and tried to start it, it still wouldn't start.
I'd have to unplug the injectors, fire it up, let it die, and then try again.

[modulation]

It's alright man, just waiting for someone to answer my leaking injector question.

Whats the question? If your fuel injectors o-rings are leaking you need to fix them or you'll have idle problems and flood the car before starting it.

Get new o-rings from the stealership and use vasoline or motor oil when you put the new ones in to keep them from ripping. Vasoline seemed to work alot better then motor oil for me.

[cotbu]

Some cars have "clear flood mode" which is actually when the ECU cuts the injectors cause it sees the TPS activated. Nissans don't do this.

It doesn't work like that. I put larger injectors on my car and had to tune them, before I tuned for them properly I'd flood the car on start. Even after that if I held down the throttle and tried to start it, it still wouldn't start.
I'd have to unplug the injectors, fire it up, let it die, and then try again.

I've also installed larger injectors in my sr, 720's they were leaking, opening throttle fully allowed me to start the car why? I WAS TUNED FOR THEM!
Btw that's a Nissan FSM snapshot! I know what your saying, it changes nothing.

[Om1kron]

fuel pump's priming? it's definitely a fuel issue that's for sure. What do the plugs look like after it runs for a bit?

[modulation]

I've also installed larger injectors in my sr, 720's they were leaking, opening throttle fully allowed me to start the car why? I WAS TUNED FOR THEM!
Btw that's a Nissan FSM snapshot! I know what your saying, it changes nothing.

My example was just to show there is no such thing as "Clear flood mode" with our cars...

Eventually I got my tune working too, and had no problems on cold starts, but it took me a few tries. I'm not as good as you I guess.

[Sileighty_85]

Check wiring sounds like the injectors are not firing when ignition is turned to "Start"

[Okinawandrifter87]

Sup Chad, have you checked the wiring? Any luck yet?

[jigga1boy]

check your neo to see if your settings for in out are correct. incorrect settings will give you trouble starts, most of the time no starts at all just crank.

my sr settings are 02 in 06 out but on a lot of forums people run 02 05.

different mafs take different settings. Try different settings if the typical 02 05 setting doesn't work

[jigga1boy]

and get a damn afr gauge if you don't have one. that way when the car is on you can see if it's your fuel system thats causing the problem if the afr is off.

[Csomme]

Okay guys, conclusion:

I wired up a push button start because my ignition wouldn't work originally, and I forgot to wire up the 12v signal going into the ECU that tells it when it's starting.


Wired that up, BAM. Starts everytime. Hopefully someone will have a similar problem and will be helped by this shit.

[cotbu]

SR wont start on it own, but it will start off Starting fluid, then run.
Like the title says. My SR is having trouble starting on its own. It will start off of starting fluid, and then when the starting fluid is all burned up, it will run off of it's own gas, for however long I choose it to. It will rev up fine, idle fine, do everything just fine when it's running.

However, when I try to start it on its own, not using starting fluid, the starter just sits there and spins the crank. The motor doesn't even try to turn over. I hear absolutely nothing, as far as trying to fire over.

At first I thought it was bad gas, so I completely drained the tank, and soaked up all remaining gas in the tank. It was bone dry. I then replaced the fuel with brand new fresh 93 octane gas.

I've also swapped ECU's, replaced the fuel filter, etc. I'm not quite sure what is going on here.

I have a stock SR blacktop, freshly rebuild, 0 miles, with an AFC neo that has not been tampered with.


Please get back to me.

Thanks, Chad.
Just wanted to see the solution closer to the problem. I still don't get correlation... but at least you fixed it

[Csomme]

The ECU wasn't getting a signal that said "HEY! it's time to start! Add this much fuel and spark like this!"


Instead it was just mehhhhh.

[cotbu]

I know what the signal does, but...However, when I try to start it on its own, not using starting fluid, the starter just sits there and spins the crank. The motor doesn't even try to turn over. I hear absolutely nothing, as far as trying to fire over. Even with that start signal disconnected injectors still fire and coilpacks still spark, because of the CAS that's why it started with starter fluid, you are correct about the timing of the start process but in your case, you should have had a backfire through the intake.