sr20 starts runs then wont start

[240sxcl50]

Like it says when i drive the car it starts and runs fine but when i park and shut it off it wont start without being pushed. The car is running super rich I'm just waiting on a tune don't know if that would have anything to do with why it wont start back up but i thought it was worth mentioning.

[ultimateirving]

Why does it need a tune? Have you done upgrades or modifications that alter the fuel delivery?

[Sills]

Does the starter work when boosted? Investigate your alternator fuse, your wiring between the alternator and starter, and possibly your alternator although I hope youve thought of that already!

[jedi03]

Had a bad main fuse on a DSM that acted like that...

[240sxcl50]

The battery is fine all the connections are there the started keeps trying to turn it over but it just won't fire. Also to answer the other question it's got 550cc injectors a 255lph pump and a nismo fpr the reason I think it needs tuned is when I bought it had an enthalpy tune which blows smoke under throttle.

[Sills]

The battery is fine all the connections are there the started keeps trying to turn it over but it just won't fire. Also to answer the other question it's got 550cc injectors a 255lph pump and a nismo fpr the reason I think it needs tuned is when I bought it had an enthalpy tune which blows smoke under throttle.

Really strange that it will start when pushed but wont turn over on its own, as either way its cranking the flywheel to start it.
My next guess would be a bad relay or circuit. Probably with your injectors if the problem started after upgrading the fuel system. The engine needs spark and fuel in order to turn over when cranked and is more than likely not recieving one. Id check the ECCS and fuel relays. Pull the fuel feed line off and see if fuel comes out when cranked, easy to access and easy to diagnose. Your injectors may not be firing properly in order to start the vehicle though even if the rail is getting pressure.

[240sxcl50]

Really strange that it will start when pushed but wont turn over on its own, as either way its cranking the flywheel to start it.
My next guess would be a bad relay or circuit. Probably with your injectors if the problem started after upgrading the fuel system. The engine needs spark and fuel in order to turn over when cranked and is more than likely not recieving one. Id check the ECCS and fuel relays. Pull the fuel feed line off and see if fuel comes out when cranked, easy to access and easy to diagnose. Your injectors may not be firing properly in order to start the vehicle though even if the rail is getting pressure.


See the thing of it is I can go out and start it up right now and i can drive it around no problem but as soon as I park and shut it off that's when it won't start back up so I feel like the injectors and fuel pump are fine cause they both work under full throttle just when I go to start it back up there's nothing

[CaTalyst.X]

See the thing of it is I can go out and start it up right now and i can drive it around no problem but as soon as I park and shut it off that's when it won't start back up so I feel like the injectors and fuel pump are fine cause they both work under full throttle just when I go to start it back up there's nothing

Does the starter turn the motor over when it won't start?

[cbeuglas]

I would warm it up and check the spark when it won't start to verify ignition pulse. Rent a fuel pressure tester also it should read 43 psi with vac line unplugged.

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[cbeuglas]

Use a timing light to verify ignition pulse

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[cbeuglas]

Try to pull codes off ecu if you haven't. 55 means no codes.

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[240sxcl50]

Does the starter turn the motor over when it won't start?


Yeah it cranks the motor there's just no combustion the first time I turn the key after I shut it off it will stutter and then nothing.

[cbeuglas]

What plugs and psi are you running

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[cbeuglas]

If there is no spark when warm could be cas

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[240sxcl50]

What plugs and psi are you running

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Ngk iridium tips 20lbs and split fire coil packs

[cbeuglas]

I usally check timing using a ka24 plug wire between coil pack and plug. I usally get a better read on timing.

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[cbeuglas]

Also I always run copper plugs as there is better performance but don't last as long. Bkr7e plugs gapped to about 28-30 depending on boost level. I would not think that is your issue


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[Sills]

If there is no spark when warm could be cas

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+1 to this. Those Crank angle sensors can be really bitchy when they start to go. I also reccomend Ngk BRK7E V power plugs, gapped to 0.28", ran way better than my Iridium plugs. Although I dont have any reason to believe the plugs would be a big issue as they sound like they run fine usually.

[cbeuglas]

I would verify there are no codes, timing, fuel pressure first.

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[240sxcl50]

I would verify there are no codes, timing, fuel pressure first.

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I'm going to sound pretty stupid here but it's obd1 so how can I check codes?

[ultimateirving]

The problem is he's running 555c injectors and no tune. Put the stocks back in

[Kingtal0n]

Wont start without a push! Dead battery!


didnt read

[coupesallday!]

I'm going to sound pretty stupid here but it's obd1 so how can I check codes?

There's a screw on the back of the ecu turn it and the red light inside will flash the code you'll have to count it and it pauses between the flashes so you can get a code

[240sxcl50]

The problem is he's running 555c injectors and no tune. Put the stocks back in

It has an enthalpy tune car runs fine when I'm driving it just won't start again after I shut it off

[240sxcl50]

Wont start without a push! Dead battery!


didnt read

Battery and alternator are fine car cranks fine it just doesn't fire.

[240sxcl50]

There's a screw on the back of the ecu turn it and the red light inside will flash the code you'll have to count it and it pauses between the flashes so you can get a code

Thank you much sir.

[Sills]

Most likely by far is that your injectors are not firing properly to start the car without a tune. Are they low or high impedance?

[ultimateirving]

Like it says when i drive the car it starts and runs fine but when i park and shut it off it wont start without being pushed. The car is running super rich I'm just waiting on a tune don't know if that would have anything to do with why it wont start back up but i thought it was worth mentioning.

It has an enthalpy tune car runs fine when I'm driving it just won't start again after I shut it off

My apologies, original post said waiting on a tune..

[Sills]

My bet is on something wrong with your wiring. The vehicle should fire if the starter is spinning the flywheel. Perhaps it somehow isnt making contact? idk. Either way if it will push start but not turn over with the starter... thats an issue that I would be worried about...

[jedi03]

How many grounds do you have?

[bansheeracer2003]

Maybe a problem with the coolant temp sensor
Next time it wont start try unplugging it and see if it starts then