HELP SR won't fire

Post by **JT$240** » Sun Aug 22, 2004 9:14 pm

hey guys, i'm just finishing up my swap of a sr20det blacktop into a 1990 nissan 240sx. everything is hooked up and i got all of my parts from jgy customs and they also did my wiring harness modifications for me too. anyways when i turn the key it just keeps cranking and it doesn't want to fire. i'm getting spark and i'm also getting fuel......so i'm kind of stumped on what the problem could be??? so any advice from all of you experienced sr swappers out there would greatly be appreciated right nowthanks

Post by **GTS4-R** » Sun Aug 22, 2004 9:14 pm

well if u got fuel and spark then what about air......hows the mafs? also does it smell like gas while tryin to turn it over? excessive gas? not enough spark? hows the cu look? what kind of situation are u in here.......make sure ALL vaccum hoses are hooked up and those that arent being used are capped off.....make sure all the plugs are hooked up on the harness toowe forgot to plug in the temp sensor to the ecu b4 and the car wouldnt start when hot unless we pulled the fuse to the fuel pump because the ecu thought the motor was stone cold so when tryin to turn it over it would retard the timing, add tons of fuel and give little spark....so it wouldnt kick....also check the timing via the CAS

Post by **goldollar** » Sun Aug 22, 2004 9:14 pm

Make sure your fuel lines arent backwards that will cause a motor not to catch. I know from experience!

Post by **yellow_jacket** » Sun Aug 22, 2004 9:14 pm

Sounds like the timing is 180 off. You need to rotate the cas 180 degrees. Should fire right up. This is of course if you have spark to all 4 cylinders(you need to check all 4), you have injector pulse, your fuel pump is on, and you didn't get the fuel lines backwards.

Post by **JT$240** » Sun Aug 22, 2004 9:14 pm

well i know forsure that my fuel lines aren't backwards. i was playin with the cas earlier, but you say 180 degreees??? so i guess i have to take one of those bolts off completely and turn it so it's 180 degrees. the mafs is good, so is the rest of the stuff. all my vacuum hoses are hooked up. i was thinking timing too but i mean aren't most engines suppost to start up because they did pull them from running cars. i'll check a bunch of things and tell you guys how it turns outthanks

Post by **JT$240** » Sun Aug 22, 2004 9:14 pm

went and played with the timing some more, nothing happened. but i was digging around by the fuse box by the battery area and i found an extra plug. it's brown and isn't very long, but i know some of the plugs don't all get used up on the swap. i also have a plug that has nothing for it to go into, it's on the engine harness and it's right after the ignitor plug, and it's grey with white/green inside the mouth of the plug and it has a black and a white wire coming out of it. i'm thinking that plug needs to connect with something but i have no idea, i'll try to get a pic up tomorrow so you guys can help me out.

Post by **SpeedRacer1** » Sun Aug 22, 2004 9:14 pm

When trying to do CAS timing, have 2 people work on it. Trying to do CAS timing alone is next to impossible. One person cranks the engine while another person rotates the CAS very slowly. Once you hear it start to fire you rotate it back and forth around that point until it starts to run. Sometimes if it takes to long to find this catch point, you may flood the engine or kill the battery.

Awhile back someone I knew was trying to do CAS timing by himself, tried for a couple days and was getting really pissed off. I show up and turn while he cranks and we got it started in about 5 min.

Post by **JT$240** » Sun Aug 22, 2004 9:14 pm

some good news, i kknow she runs!!! i just poured some gas in the intake manifold and she fired up. so somethign is wrong with my injectors?? i'm getting 12V from each red wire off of each injector, but i don't think they are pulsing?? any help please

Post by **JT$240** » Sun Aug 22, 2004 9:14 pm

i got it starting again but it stalled right after i got it going. and i couldn't get it going again, so now i definately know it's the timing! i was just curious how do you set the timing if you can't get the car running?thanks

Post by **SpeedRacer1** » Sun Aug 22, 2004 9:14 pm

If it actually started then stalled, the timing wouldnt be my first suspect. Try running ECU error codes and see what you come up with.

Post by **JT$240** » Sun Aug 22, 2004 9:14 pm

well not really stalled just kinda quickly shut off. it has to do with the battery being dead and the timing off. so i keep charging the battery and then once it's charged i go to crank it and it's just about to start running. then my battery goes dead, so i mean after trying to start it for like 4days didn't help much on the battery, i think i'm gonna go buy a new one.

Post by **S13240** » Sun Aug 22, 2004 9:14 pm

Try jumping your old battery before buying a new one.

Post by **JT$240** » Sun Aug 22, 2004 9:14 pm

well, i've been charging and jumpin my battery and it seems to be working a little i guess. the thing hasn't been able to run yet though. it's cranking still and kind of firing, it's really rough though and isn't able to run on its own yet. everytime i try to run it after an hour of charging the battery or so it seems to be better the next time i try ot start it. so is timing still my issue?

Post by **JT$240** » Sun Aug 22, 2004 9:14 pm

SHE'S ALIVE!!!!!!!!! well everythign seems to be runnning, i was checkin out threads about the ecu and i thought i'ld disconnect my battery which is known as an ecu reset i think. anyways after a couple times of tryin to start er she purred likea kitten. now a couple things that i noticed off the bat, are that my rpm needle isn't working, so i have to figure out what's up with that and my engine light is on in my dash? so any idea's about the rpm needle would be appreciated, i have a 90 240sx and i put in a silvia cluster THANKS EVERYONE for helping or trying to help, i'll post some pics up as soon as i can

Post by **SpeedRacer1** » Sun Aug 22, 2004 9:14 pm

You may have spliced the wrong wire down by the ECU for tach signal. Check that connection.

Post by **JT$240** » Sun Aug 22, 2004 9:14 pm

i drove it around the block with the bumper off and **** hangin and it felt soooooooooooooooooooooooo goooddd! oh my god, but from driving it for like 5mins it stalled on me like 5 times, stupid BOV, how do you guys beat around that? and speedracer about the ecu, i didn't do any splicing. i got my harness modified by jgy customs and i just plugged and played. i'm thinking since i have a 90 (sohc) i need to add another wiring to my harness that runs from my cluster to my ecu because it might be different than the (d0hc).

Post by **SpeedRacer1** » Sun Aug 22, 2004 9:14 pm

Chech pin #3 on the ECU and see if there is a yellow wire with a red stipe connected into your dash wiring. Dont be mistaken since there is a red wire with a yellow stripe close by.

http://sr20det.nismo.org/srtech.htm

Post by **JT$240** » Sun Aug 22, 2004 9:14 pm

but everything else works on the dash, like the fuel, temp, speed, etc. etc.

Post by **SpeedRacer1** » Sun Aug 22, 2004 9:14 pm

Well thats not shocking, the only other wires that are at that connector that go to the gauge cluster are the speedo and temp gauge.

HELP SR won't fire

HELP SR won't fire

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