sr20 redtop ==> s14 wiring help

[joewantstodrift]

i recently had a friend of mine go through all the notes i could gather from the internet and "redo" my entire wiring harness. im still experiencing the same problems though. the car doesnt have as much power as i think it should. it seems like its running lean or at least thats the way it feels. i dont know if thats the problem or not. does anyone have any ideas as to what might be causing this problem? also, does anyone know of a place that sells premade harnesses. id rather just buy a premade one if i can rather then sending my already cut up harness in for service somewhere. thanks.

Joe

[damesta]

Check your ecu for codes and check your timing before anything else.

[mRclARK1]

Try what the previous post suggested first. If nothing there is the problem, and you still think it is your harness, try: http://www.wiringspecialties.com/
I don't know if they make harnesses from scratch, but just email and ask. In either case they will probably be able to help you.

[joewantstodrift]

thanks guys. yeah i checked the ecu for codes not too long ago and there were none, and i had the timing done within the last year. how often should the timing be done?

[mRclARK1]

If your timing has been done within the last year I doubt that would be the problem, unless it was done wrong, or you did any mods that would affect the timing.

[joewantstodrift]

well i just checked the ECU for codes and i got a 13 which should be engine coolant temp sensor. i guess ill try replacing it and see if the car runs better. does anyone know which car uses the same CTS as the SR20DET? oh yeah i need the sensor for the ECU not for the coolant temp guage. thanks.

Joe

[joewantstodrift]

well i just checked the ECU for codes and i got a 13 which should be engine coolant temp sensor. i guess ill try replacing it and see if the car runs better. does anyone know which car uses the same CTS as the SR20DET? oh yeah i need the sensor for the ECU not for the coolant temp guage. thanks.

Joe

[mRclARK1]

The one from a 91-94 B13 or Sentra SE-R should be a direct replacement.

[joewantstodrift]

ok so i replaced the CTS (the wrong one was in the motor) with the correct one. i drove the car and the problem was the same. i check for codes again and got 55. 55= no malfunction. now i have no idea what to do. anyone have anymore ideas as to what could be wrong? the car also has trouble starting up when the engine is cold. i have to feather the gas and give it some finesse to get it started and then it will have a rough idle for awhile. sometimes it will die after a few seconds. also, once the engine warms up it still idles low (around700-800rpm's) and still drives sluggish. also when i "get on it" my exhaust gas temperature guage will read in excess of 14 or even 15 sometimes. i worry about it getting to high and possibly having my motor "blow up". i have no idea what to do to fix this problem and so far ive re-done my wiring, changed the TPS, changed both coolant temp. sensors, gotten the timing done, and probly some other stuff i just cant think of right now. any help would be much appreciated. thanks.

Joe

[mRclARK1]

How long ago did you swap your SR in?
Sometimes when the engines are pulled in Japan, they use the fuel rail as an attatchment point. This causes the injectors to have problems sealing properly, which lets air pass through, and the engine will idle funny, run poorly, stumble when accelerating etc.
Check your fuel rail...if it looks slightly bent; straighten it out so the injectors seal properly against the intake manifold. If that is the problem, that is all it should take to fix it.

[joewantstodrift]

ill check it out tomorrow. the motor has been in the car since august '04 i believe. it ran fine at first and there were no hesitation problems its only been recently that its been doing it. i drove it around tonight and it seemed to be alot better actually. i dont know if its do to the weather or not. im still concerned with the rough idle and startup though.

[Suk02Si]

Possibly bad MAF?

I have the same exact symptoms and I've changed to new plugs, injectors, injector o-rings, timing set to stock, fuel pressure set to stock, rebuilt the turbo, checked all vacuum lines, checked spark w/ each coil pack and still runs the same. The only item I haven't checked/replaced is the MAF:smash:

[nrg]

bad maf, bad fpr, bent fuel rail, bad fuel pump, vaccum leak, boost leak, bad plugs and gap, bad sensor somewhere.

TIMING IS WRONG ON THE CHAIN. is what I'd say is wrong. Remove the valve cover, set the motor to TDC, put the CAS back on the right markings for tdc, and put valve cover back on and try to start the car.

[janko]

ok so i replaced the CTS (the wrong one was in the motor) with the correct one. i drove the car and the problem was the same. i check for codes again and got 55. 55= no malfunction. now i have no idea what to do. anyone have anymore ideas as to what could be wrong? the car also has trouble starting up when the engine is cold. i have to feather the gas and give it some finesse to get it started and then it will have a rough idle for awhile. sometimes it will die after a few seconds. also, once the engine warms up it still idles low (around700-800rpm's) and still drives sluggish. also when i "get on it" my exhaust gas temperature guage will read in excess of 14 or even 15 sometimes. i worry about it getting to high and possibly having my motor "blow up". i have no idea what to do to fix this problem and so far ive re-done my wiring, changed the TPS, changed both coolant temp. sensors, gotten the timing done, and probly some other stuff i just cant think of right now. any help would be much appreciated. thanks.

Joe


You're initial cold start / idle issues could be your IACV. You might want to pull it out and test it and while you have it out give it a really good cleaning.

[joewantstodrift]

thanks for all the help guys. Suk02Si, i also changed my plugs towards the beginning of 05 and ive checked for vacuum leaks. yeah i thought about maybe the MAF being bad too but i dont know how to check it. "nrg", i dont think there is a vacuum leak there might be a boost leak but i didnt think that would make it run like this but maybe im wrong. the fuel pump is less than 2 years old. its a walbro 255. and the plugs are bosch platinum or something. ill check out that timing situation too but i gotta go to my buddy's shop for that one. janko, thanks man thats what i was thinking it was too. how do you test the IACV? im also gonna add some Gumout fuel system cleaner and a fresh tank of 93 octane. im almost to the bottom of this old tank of gas thats been sitting in there all winter. i havent done it for several months either so its due.