crankshaft position senser

[brianboy240]

long story short....

this is a 1990 240 with a redtop sr20 freshly installed

car was in shop for a year, they said it was done i got there and started it up fine drove it home...shut it off and now its a no start... what a teas...

i have no injector pulse and no spark. i just put in a new ecu, so the only thing left is the crank position senser. but the thing is....I CANT FIND THE ****ING THING. i didnt install the engin, i had a shop in woburn do it then sent it up to russ at JNR motersport to fix the wiring and this is my first sr20 swap. now what i think it is, is when i started it the first time i musta shook loose the crank pos senser, cuz it wont start enymore....but it push starts . im almost positive its the crank position senser but i cant find it enywhere...does enyone have a pic of where it might be. or even somthing it might be near? it would be greatly appriciated.

thx for the help

[4wheeldrifts13]

Are you saying you dont know where the Crank Positioning sensor (CAS) is?Its where your distributor would be on a KA.Thats my motor, it has an aluminum CAS cover.. yours will be OEM black most likely. But I'm pretty sure the CAS isn't your problem if you have no injector pulse or spark..

good luck tho,-Sean

PS: Just out of curiousity, does your car get power to the fuel pump? Does it have a walboro fuel pump? If not, I would check the fuse and make sure it is priming when you try to turn over the car, but you did say it didnt have spark... that's curious.. check to see if A. your battery is dead, or B. your Alternator *mine died when I first did my swap in my coupe due to blown alternator fuse.. (WHO' would've thought) hope you can figure it out

[Rucca]

I don't think your car would run at all without a crank position sensor. You couldn't push start it.

If the ecm doesn't know where the crank is (how it determines when to send spark to what cylinder) it won't try to run because it would cause too many problems.

[brianboy240]

to 4wheelsdrift13 isent that my camshaft position sensor?... im looking for the crankshaft position sensor, unless it only usses cam sensor, but i checked all my leads on that and there all getting power... thats y i think its the crank sensor becuase like rucca said, it needs to know when to squirt in fuel and spark.

i don't think the altinater has much to do with this, and my battery is fine it's brand new. and the engin turnes over perfect.

ill check my fuel pump today. i drove it up to my old garage i used to work at, and my old boss has been looking it over, but he has no idea eather.

i also checked ALL the fuses, and there all getting power...its ganna be somthing really stupid like a wire shorting out or somthing... aggrivated the piss outta me...

[4wheeldrifts13]

OH wow, I didn't even read that it DOES push start? (*I didn't even read that otherwise I would've said alternator, I thought that you drove it home, and the next morning you couldnt start it? You drove it to a shop? Im confused

and as far as the crank angle sensor vs cam angle sensor.. I thought they were the same? good luck and keep us updated.

[brianboy240]

well they kinda are the same...but one mesures were the cam is and the other mesures were the crank is. but i guess on the sr20 they are the same?i havent tried to push start it yet today...but this is exactly what happend....

i picked it up, drove it home, then shut it off...whent back out to try to start it and it wouldnt start. a few of my friends came over to see it, and they wanted it to start so they pushed started me, and it worked....then i drove it to the shop and asked my old boss what might be wrong...he tested alot of stuff and found out that there was no injector pulse and no spark.

as of now its still sitting there...i might have it towed back upto russ (he did most of the wiring) and hopfuly he will be able to fix it

but y would the altinator have enything to do with spark and fuel?

[4wheeldrifts13]

The reason why I thought it was the alternator was because you said it just shut off on you. If your alternator dies.. the car starts to run like **** and it just dies. thats what I thought it mightve been in your case. but you said you could push it. Long story short.. I would definately check other causes than your CAS, because it ran fine before then it died.. i would take it from there and troubleshoot. Ask other people, check things you wouldnt expect (grounds, fuses, wiring goofs, MAFS plug or wiring, Fuel pump maybe?)

dude, best of luck, keep us posted.

[brianboy240]

ok guys, so heres the update...

i was fidling around with the ecu wiring, and got it started...barley.ran fine after a minute of idle, drove it home, shut it off and pray'd.

it started about 3 times...and now it wont start again. i think i blew a fuse also (playing around with e-fans) becuase now all my electonics gets reset (clock, radio, and so on)

so i think its poor wiring somewere near the ecu if my car starts when it wants to. everything must be working...exept for the wiring.

any input guys?

edit: also when it does start, nothing workes untill i rev it up to about 2.5k (nothing as in gauges, electronics, absolutly nothing) and when everything turnes on my wipers go across the window twice...weird, or some kind of sign? soooo confusing

Modified by brianboy240 at 6:00 PM 4/16/2008
Modified by brianboy240 at 6:01 PM 4/16/2008

[Rucca]

You are missing grounds. Weird stuff will happen when you have grounds disconnected such as wipers magically turning on. If something isn't grounded it will find ground somehow. Whatever you have is finding ground by going through the wipers, which in turn powers them.

Atleast, that'd be my guess.

Also, I apologize I thought you said you HAD injector pulse and spark but rereading I see you DID NOT have fuel/spark. This leads me to believe that it IS your crank position sensor (which is probably also the cam position sensor like on the KA but I don't really have SR experience).

Check for codes - CAS malfunction will store a code but not set a SES light (for the KA at least). Confusing though because while CAS failure will cause no fuel/spark - you can't push start it either. If you get no fuel/spark you can't push start it at all though so....... did you witness the no fuel and spark or did someone just tell you that? Maybe double check

[brianboy240]

yea i know what you mean, and i was there for the tests..i did them with my old boss. one was a noid light to test for ignition pulse, and the other was a spark test where u extend the wire and add another little thing that will make spark, i dunno we used the right tools.

but i agree with you on the grounds. im ganna go threw it tomorow after school (the best i can at least) and see if there is a ground not quite connected, or a few wires that might have split. also the first guy who worked on my car attempted to wire it, but did a hack job (all kinds of e-tape, random relays and things being held on with zip ties...). and russ tried to fix it the best he could. that kinda leads me into the whole ground thing.

and i know that you read the little red light on the ecu to get codes if there are any...but i cant figure out what u have to ground to get those codes. enybody know? its a #62 redtop ecu if that matters.

i remember in my old ka there were no lights on for that stuff ever, but i have a 91-93 gauge cluster (to work with the sr) and it dosn't read enything like that ethier. so i think the same rules apply.(but at least before it was obd1 )

[4wheeldrifts13]

No, it doesnt matter that the ECU is a 62, E5, FJ s13 ecu will work on any s13 SR. (FJ requires more wiring: type x blacktop)

The thing I caught is thats the EXACT thing that happened to me when i first got my car running. Check in your engine bay. check the alternator fuse. its a big fuse.. if bad replace it.. actually just replace it anyway.

If that doesn't work (it worked for me after tightening down EVERY ground.Including the grounds that you don't think are important. like the chassis grounds in your engine bay. The more grounds you have, the better off you are.

Also, check underneath your dash, there will be a white box over your fuse box, tighten the 10mm screw just to see if its tight enough (I replaced my chassis harness and I was always paranoid that this was my problem) but then I replaced the alternator fuse and viola! it started RIGHT up..if this doesnt work I suggest getting the harness checked out. It could be a hack job. Not saying your friend doesn't know what he's doing, just saying it could have a short somewhere.. Good luck again. I want to hear that your car is running again soon good luck man

[brianboy240]

ok so after fooling with it again, it started..but now it bogs out, has no power..my electronics fade in and out from working... lets just say its an elctrical mess right now... but at least it starts! we have some progress...

and now im almost positive its loose grounds or wires becuase when my speedo works the car works fine, sorta lol. i accualy talked to russ and hes ganna go threw it again. im ganna let him know whats been going on and im sure he will get it and work the kinks out.

as much as i love to work on my car myself i need this done becuase i have no other car to drive and im a full time student in college. so don't bash me for not doing it myself

[4wheeldrifts13]

Oh dude, don't worry about it.If I am stumped on something, I talk to my friends at a shop and they help me out.

but the way your talking about interior lights dim and stuff is really pointing at alternator fuse or battery. but yeah have him check the harness and check your grounds. (or have him?)

[brianboy240]

ok so new update....

car runs and starts fine!

problem: a resistor INSIDE the ecu was blown.

who knew.... but everything works electricly and properly. thx to my good friend russ up at JNR Motersport, the man knows his stuff.

and thank you guys for the input but knowbody coulda guessed that problem.

[4wheeldrifts13]

WOW that was random. lol... But yeah that makes sense. Did you have to replace the ECU? How'd he figure that out..? lol good deal dude. Glad you have the car running again.

[Toadstool]

Hi, This is Russ From JNRMOTORSPORTS...

well how did I find it GOOD QUESTION!!!! dunno but I did...Looked over the entire car for a while...Brian Glad your cars running well...like I said bro you need anything lmk!!!!!!!!!LOVED the rubber you laid down bro!!put a smile on my face!!