CRyan

Hello all- new member to this site but am known on I guess the rival site of this one...anyway I have got a bit of an issue---first I will give you the background info...

I have recently decided to do an S14 sr20det swap in my 97 240sx. Just to shorten this a bit I was hoping for a primarily stock sr to come to me...I am even running a side mount. My goal was to have a nice reliable sr swap making around 230-250 horsepower...anyway.

Engine came in and I did a little visual. Noticed it had a nismo flywheel and hks wastegate (non-adjustable)...apart from that the motor seemed to be stock-how I wanted it. Well I have been having some cranking issues (harness was sent to wiring specialties) and have yet to figure out the problem...

So BIG QUESTION!!! I ran a compression test on it tonight and noticed that all the cylinders were registering 210?!? What could this mean? I have been thinking the issue of it not cranking was related to fuel- there is only, if any, of just a faint FAINT smell on the plugs...

I adjust CAS timing tonight using the frsport write up...

I also did this compression test with throttle wide open.

All fuel injectors are getting signal...

I have spark...

What is going on with what I thought would be a simple cost efficient swap?!? Please help me!!!

Thanks
CRyan

om3ga

What about fuel? are you getting fuel? did you replace your fuel pump is it wired correctly? Check to make sure your fuel feed and return lines are correct (you can squeeze them to see which has pressure after priming a few times) Good luck!

CRyan

Yes I have fuel coming from pump and out the return...

But as of now my main concern is this outrageously high compression...

chvybeatsford

Did u have the trottle mashed when doing a check. I do belive you are supposed to have it at full trottle.

210 compresion could be

Head was shaved ?
Block was decked ?
Diffrent pistons installed?( I duno much bout sr piston but a dome pistion is a 350 etc would raise compression.

CRyan

God I don't want some modified engine. Way too much money there...

I read a little more last night and this morning and the only 3 things it could be is modified head/block, gauge was wrong, and something about oil on top of cylinder or something like that?

I am about to go visit my ex step dad to get a compression tester that i know is in working order...

deuceforty

how about you give some more info on your actual problem.

is the engine turning over

do you get any backfiring or smoke while its turning over

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chvybeatsford

Is it the stock sr 370 inj in there(purple)

it must turn over cause he did a compression test. It could be fuel pressure? I know u said it has a Lil fuel on the plugs but if it dosent crank I would think after a long atemp to crank the plugs would have a notiable fuel smell

CRyan

What more info do you need? I gave japan motor import a call and he said there was no way that could have sent me an engine reading that kind of compression. So I am going to get my snap on compression tester because I know it is dead on.

So you believe fuel pressure chevy? I took the return line off and turned the key to on postion, and it seemed to flow gas, but nothing like the supply side- it seemed to be a lot less... I guess I can see what fpr is doing- anyone know a part number or another vehicles fpr I could use? Thanks guys!

chvybeatsford

my car jus had a bad fuel pump witch cause my car to bog as if I let go of the gas. Not enough fuel so car would almost die.

More info he means is .... When u turn key the motor turns over but dosent fire? Does it atleast try to start? Like a lil hicup or jus turns without any hint of firing. If it does try to start and hicups ur timming may be off? Did u try setting timming?


Also when u did compression how many times did u turn the engine over before reading gauge? Usually I allow 4 -6 full cycles. N e more may cause higher compression. Also I think on a hot motor (running temp) compression should be 150-165. Can't really rem. A cold engine may have a higher number also.

Also check ur grounds. Ignighter , make sure all coil packs are on tight with no tears. U did put a walpro 255 pump in?


By all means I'm no expert but I dis have problems with my swap and had others have me check what I'm telling u .

CRyan

Ok well no the car does not even hicup (as I do the sound out loud to describe it) basically it is just turning over with no combustion in any chamber. Fuel injectors are getting power- coil packs are getting power...and I set CAS last night but I haven't tried cranking it since I set timing... So I can try it today...but doubtful it is timing...because eventually it should burp something out. I did notice more gas smell when we were doing compression test though...

And no I don't have a walbro- well I do have one just sitting in the shop but it is linear...and dis not think I could use it...also have some supra injectors sitting around but I don't think they will work with the car either...

I was hoping this would be a primarily stock, cost efficent swap ya know?

chvybeatsford

Let's see what some one else will have to say. The guys on here are great and help alot.

CRyan

Yeah I sure hope so- just found out I am leaving out of town tomorrow- so one more day/night to get my car running...

KrazyS13

Have you checked your Ecu to see if its throwing any codes? Also, check and make sure ALL of your grounds are good and tight.

VOoDOoGTX

if you wanna find out if there is liquid in the cylinders, pull the plugs and turn the car over.

CRyan

No fluids coming out the top of the motor then- or did not notice when we were turning engine over...I figured some fuel might mist out but none...

There is ONE ground wire I don't have connected that comes from lower harness or might just go to the intake mani... And it isn't grounded because it is a little to short to reach terminal on battery... But it didn't seem to make much difference... And if a ground were the case I should being getting voltage from the injectors, correct?

Are there any other grounds that might be hidden I am not aware of?

VOoDOoGTX

ground the wire, just because it should be grounded anyway. i havent looked through everything you said but i will and get back too you.

VOoDOoGTX

pull the fuel rail and point it away from the engine and turn the car over. all the injectors should mist a perfect mist. no dribbling.

get back too me.

VOoDOoGTX

my gues is that the LWFW is not allowing the sensor too read TDC so it will spark intermittently and wont fire fuel at the right time.

CRyan

What is the lwfw?

KrazyS13

lightweight flywheel

CRyan

Oh... I feel more informed already...but I thought there were plenty of cars that ran a lightweight flywheel that didn't have problems...

CRyan

Alright where is the sensor that is sensing the flywheel? User where it is on the ka trans, but not SR

fliprayzin240sx

No there is no crank angle sensor on the SR like on S14 KAs. Did you put the fuel lines the right way? Meaning, fuel filter line into the rail and return line from the FPR? Did you check for spark? Ground out the spark plugs and watch for spark. I've had a car that I was troubleshooting that was getting spark but it was weak. Swapped out the igniter chip and fixed the problem.

As far as the high compression, thats pretty high, could be high compression pistons. Can you see down the spark plug port to see if the pistons domed or flat? SR stock pistons will have a slight bowl to it. Do you notice a headgasket too? Usually most engine builders in Japan love to use liquid gasket between the oil pump cover and the head. If theres gasket there, its a tell tale that its been cracked open.

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CRyan

Well I have spark...and fuel is the right way just ad you stated. But there is no fuel in the cylinders...I only smell it VERY faintly.

VOoDOoGTX

check too make sure the injectors are all firing.

CRyan

God it looks like a headache to remove the fuel rail...any pointers there?

VOoDOoGTX

nope haha, i dont have a SR20. on my 944 turbo its 4 bolts and it pulls right off.

CRyan

Anyone have a clue what sensor is fixated near the flywheel? I can find it on my KA trans but not the SR...if it doesn't have it than how could the lightweight flywheel make problems? Also, could my starter be acting funny because of this flywheel? Once about every 3-4 times I turn it over it sounds like the starter only engages, but will not actually turn the flywheel...if I turn the key repatedly about 7-8 times from acc to start position quickly, it will suddenly turn the motor over....any ideas there...I took the starter to a rebuild shop, and I was told to use sohc internals...so I am sure he got it back together correctly...

fliprayzin240sx

No there isnt any flywheel sensor on any SRs. You only have speedo, neutral and reverse switch on the lower harness.

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CRyan

And none of those could be a reason the car isn't cranking, eh?