SR20DET, gets fuel, spark, but won't start... - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

IsaacMTSU · 03-03-2011, 03:42 PM

I have a Redtop SR20DET in a 95 240SX (S14). I have finally wired everything up and got everything working (I think), but it will not crank up...I have tried everything. Here are the details: It gets gas (drained and fresh 93 octane added today), all 4 plugs fire when pulled out and grounded on the block, fuel pump runs, lines are ran correctly, it is in time according to an online guide that details the FSM method. The cams are correctly positioned (front lobes out and notches lined up with the different chain links) when cyl 1 is at TDC, the CAS was placed correctly with the dimples lined up right and the CAS about centered. I have tried moving it while cranking. It coughs once every 4-5 seconds when cranking and smells really strong like gas. When I take the plugs out, they are soaking wet. I can't figure it out!

[meant to post this in Engine Tech :/ ]

FFSr20Det · 09-28-2011, 11:55 PM

Im having this exact same problem ive switched ecu's with a friends and does same thing ive switched out mafs and still nothing... no cluw what else to do.

angelz365 · 09-29-2011, 12:46 AM

may sound stupid but is your cluster harness pluged in to your ecu's cluster harness cuz i forgot to plug mine in and it wouldnt start until i did

FFSr20Det · 09-29-2011, 02:48 PM

Yeah, mines plugged it, it weird as hell, car was running but i dont think i had the maf wires done right and it stalled, redid the maf wires and got them hooked up right and since then it wont start, im getting fuel and spark, ive switched mafs with a friends and and ecus out of his car and still no luck, i checked the CAS and rechecked timing and its all spot on, i have no clue wtf happened and why it wont start now.

*fliprayzin240sx* · 09-29-2011, 09:38 PM

Checked compression? You need 3 things for it to start, gas, spark and compression.

Jasonx63 · 09-29-2011, 09:49 PM

i had a very similar problem recently with my s13 sr in s14. I have a wiring specialties harness so it might be different but. underneath the dash by the ECU there are two Relays that are there one should be plugged in and one might not be try unplugging the relay and see what happens when i did my car started right up.

persain48820 · 10-02-2011, 01:44 PM

Wow, this must be typical. I, too, have the same issue. Have fuel, spark and compression (160, 155, 155, 160). Check each coil to ensure spark, and I do. Physically pulled the fuel rail with injectors and fuel lines to ensure fuel spraying out, and I do. MAF volts at crank between .5 and .6. CAS volts are something to the extent of 1.0 volts and 1.5 volts, maybe higher. As far as ignition and fuel, I have Spitfire coils and stock 370's. Wiring Specialties harness running to a Nistune ECU. I feel I have exhausted every resource and have been able to come up with nothing. Please, if anyone has any input, please inform me, and anyone else in this board.

thesandman6 · 10-05-2011, 09:30 AM

Just had this same problem for a week, drove me insane. I ended up installing the cas with it rotated about 90° ccw off of the alignment dot and it works. Trying to figure out why it does this though.

03-03-2011, 03:42 PM	#1
IsaacMTSU Join Date: Feb 2011 Location: East Tennessee Age: 36 Posts: 11 Trader Rating: (0) Feedback Score: 0 reviews	SR20DET, gets fuel, spark, but won't start... I have a Redtop SR20DET in a 95 240SX (S14). I have finally wired everything up and got everything working (I think), but it will not crank up...I have tried everything. Here are the details: It gets gas (drained and fresh 93 octane added today), all 4 plugs fire when pulled out and grounded on the block, fuel pump runs, lines are ran correctly, it is in time according to an online guide that details the FSM method. The cams are correctly positioned (front lobes out and notches lined up with the different chain links) when cyl 1 is at TDC, the CAS was placed correctly with the dimples lined up right and the CAS about centered. I have tried moving it while cranking. It coughs once every 4-5 seconds when cranking and smells really strong like gas. When I take the plugs out, they are soaking wet. I can't figure it out! [meant to post this in Engine Tech :/ ] Last edited by IsaacMTSU; 03-03-2011 at 03:44 PM.. Reason: meant to post in engine tech

09-29-2011, 09:38 PM	#5
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	Checked compression? You need 3 things for it to start, gas, spark and compression. __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

09-28-2011, 11:55 PM	#2
FFSr20Det Join Date: Sep 2011 Location: Florida Age: 36 Posts: 3 Trader Rating: (0) Feedback Score: 0 reviews	Im having this exact same problem ive switched ecu's with a friends and does same thing ive switched out mafs and still nothing... no cluw what else to do.

09-29-2011, 12:46 AM	#3
angelz365 Leaky Injector Join Date: Aug 2010 Location: Rialto, CA Age: 32 Posts: 86 Trader Rating: (8) Feedback Score: 8 reviews	may sound stupid but is your cluster harness pluged in to your ecu's cluster harness cuz i forgot to plug mine in and it wouldnt start until i did

09-29-2011, 02:48 PM	#4
FFSr20Det Join Date: Sep 2011 Location: Florida Age: 36 Posts: 3 Trader Rating: (0) Feedback Score: 0 reviews	Yeah, mines plugged it, it weird as hell, car was running but i dont think i had the maf wires done right and it stalled, redid the maf wires and got them hooked up right and since then it wont start, im getting fuel and spark, ive switched mafs with a friends and and ecus out of his car and still no luck, i checked the CAS and rechecked timing and its all spot on, i have no clue wtf happened and why it wont start now.

09-29-2011, 09:49 PM	#6
Jasonx63 Zilvia Member Join Date: Aug 2010 Location: Fresno Age: 33 Posts: 225 Trader Rating: (2) Feedback Score: 2 reviews	i had a very similar problem recently with my s13 sr in s14. I have a wiring specialties harness so it might be different but. underneath the dash by the ECU there are two Relays that are there one should be plugged in and one might not be try unplugging the relay and see what happens when i did my car started right up.

10-02-2011, 01:44 PM	#7
persain48820 Join Date: May 2011 Location: Bowling Green, KY Age: 39 Posts: 12 Trader Rating: (0) Feedback Score: 0 reviews	Wow, this must be typical. I, too, have the same issue. Have fuel, spark and compression (160, 155, 155, 160). Check each coil to ensure spark, and I do. Physically pulled the fuel rail with injectors and fuel lines to ensure fuel spraying out, and I do. MAF volts at crank between .5 and .6. CAS volts are something to the extent of 1.0 volts and 1.5 volts, maybe higher. As far as ignition and fuel, I have Spitfire coils and stock 370's. Wiring Specialties harness running to a Nistune ECU. I feel I have exhausted every resource and have been able to come up with nothing. Please, if anyone has any input, please inform me, and anyone else in this board.

10-05-2011, 09:30 AM	#8
thesandman6 Join Date: Aug 2005 Location: cocoa florida Posts: 5 Trader Rating: (0) Feedback Score: 0 reviews	Just had this same problem for a week, drove me insane. I ended up installing the cas with it rotated about 90° ccw off of the alignment dot and it works. Trying to figure out why it does this though.