Ka24det project

[compactfean]

Dude, you really should use search on here. a lot of this had been covered. How to check codes has been covered, timing has been covered, fuel pressure, has been covered. By the way it sounds, are you even using a timing gun? If you are just doing things on a whim your going to detonate they motor. As far as the car clean, spray it in to a vacuum line. Also 1-2 psi is hardly something that I would call load (especially up a hill) so 13.5 afr isn't t that bad. The main thing I would be looking at is the afr at wide open throttle. Shoot for 11.5 and the rest should fall in to place. High egt is caused by timing too far retarded! Use a gun and get it right. Also if you have a knock code it won't maurer what you do to the dizzy because the ecu will go into safe mode and retard the timing anyways. As for your fuel pressure, it is possible they your pump is not keeping up, but that would just mean it was in its way out anyways.

[nissan240boy]

Put in the 255 walbro today and instantly afr was a little better, I checked fuel pressure and it was at 42 at idle with vacuum so the pressure is higher, any how I set fuel pressure at 52 psi with no vacuum and im down to 12.5 under wot, every now and then itll run 11.1 under wot but usually around 12.5, my idle still fluctuates, I set timing correctly now with tps connected because engine shuts off if I disconnect it, engine runs decent now, im still runnin a little lean and hot but should I raise pressure more till it runs 11.5 all the time under wot?

[compactfean]

If you disconnect the tps and the car dies that means that one if your base settings is not right, rather maf voltage, coolant temp sensor is it of wack, timing. Something. if its still lean, its rather your maf isn't putting out the right voltage, coolant temp sensor isn't working properly, injectors are not flowing enough..... Or, it is possible the tune is lean. However what psi were you tuned for? You should run the psi the ecu was tuned for and check afr.

[nissan240boy]

Im not sure wat psi the tune was for, um I was considering buying another set of injectors to guarentee that there not the problem, I found a used set with a warrenty and says there flow tested and has the paper 370cc at 43 psi and the brand of the injectors is venom, also my walbro 255 is quiet is that normal? To check maf voltage which of the three wires do I check and same with tps and iacv? Also wats most common cause to make idle go up and down between 500 and 1200?

[compactfean]

[quote][/quote]You would be better off sending yours out to get cleaned and flow tested. (venom injectors have different lag time). don't go offs the doing of the pump. If anything load means its most likely on its way out. Maf and tps are checked at the white wire. Your jumpy idle could be a, number of things.
Set the throttle body
Set the tps voltage
clean iacv
Ohm test iacv
DO A BOOST LEAK TEST!
If you don't have a tester, I'll show you how to make one cheap.
start the car and go through the procedures to set idle and timing
Check maf voltage
If all of that is done (I'm sure you skipped something) than there shouldnt be any problems.

[nissan240boy]

Ok its like almost a hundred bucks to get them cleaned and tested, I coulf prolly find stock sr injectors with a warrenty for 150 off ebay, im just worried ill be wasting money, I mean wat brand would be best to go with for injectors? And the fuel pump is new its a walbro 255, and I sprayed carb clean around my intercooler fittings and didnt see any leaks but yea post how to make a tester cheap. And I think my oxygen sensor is fine, it reads .2 volts at idle

[compactfean]

What I'm ask getting at, is you are going trust a set of injectors on EBAY that are used and never been flow tested? Lol yeah maybe warrentied to work. Lol. Have fun with that. I was talking about spraying carb clean into a vacuum like to see if extra fuel makes it run better. If it does you have injector issues. Also did you calibrate your wideband? As for the boost leak tester, give me a minute to upload a picture.

[nissan240boy]

Yea im thinkin warrenty would be better for injectors, wat brand injectors are good? No I didnt calibrate wideband, how do u do that, ill do the carb cleaner test, hey I raised fuel pressure to 62 psi with no vacumm and now im runnin steady 10.8 and 11.2 under wot, but egts are still getting hot?

[compactfean]

That's,pretty healthy afr but you really shouldnt have to crank it up that high. I guess, do what you got to do untill you figure out what the real problem is. As far as your egt, that has to be timing related. You need to check codes. As for calibtating your wideband, read your wideband manual.

[compactfean]

This is my setup.
You need a 300zx or whatever other cars fuel filter with some fuel line
An air line fitting kit to adapt the hose to fuel line.
the air line itself
An air regulator
And a hose barb

Depending on what kind of stuff you have laying around this should cost you anywhere from $10 to $25 bucks BE CREATIVE AND YOU CAN SAVE MORE! Lol. All these parts I got for $16 not including the fuel filter at harbor freight.

[nissan240boy]

Ok I made a leak tester, basically I put a pvc cap inplace of my air filter and put a valve stem in it and pumped it up with my air compressor, couldnt get more than 1 psi on the boost gauge, I found two leaks which im sealing tomorrow, there was a small leak around the injector seal to the manifold, should it hold pressure consistently, will the valves seal the air from leaking out the exhaust? And is my afr gauge reading prettu close even without calibrating it, I thing it said it didnt need calibrated if it wad for regular fuel but ill check it

[compactfean]

Injector seats should be completely air right. If you are really finicky like me you can use soap and water in a spray bottle and find the really small ones. (make sure you unbolt the pcv and make sure it doesn't leak, as well as the brake booster check valve). It is possible that you did the boost leak test when the valve were overlapped, but if you turn the motor a little bit and you still hear air coming out of the exhaust id say you might need a valve job.

[nissan240boy]

yea ill check it again, wheres the pcv to unbolt, i thought that was on the valve cover, i would think my valves are fine its a pretty good running ka, i checked online about calibrating my wideband and the instruction manual says that the my oxygen sensor is labratory calibrated and never needs recalibrated.

[compactfean]

Ieght cool, some aren't. Just wanted to double check. Maybe someone can chime in here about the pcv because its been like 6 or 7 years since I've had my hands in a ka...... Definately something to check though.

[moso]

the pcv valve on the ka is located just under the the intake manifold where the radiator hose attaches. It is mounted in a small catch can that is bolted to the side of the front cover. It is plumbed into a steel runner that is connected to the bottom side of the intake runners underneath the injectors...... Its a bi**h to get to, good luck.

[compactfean]

I guess if thats the case as long as you don't have excessive amount of air coming out of the breather tube during the boost leak test than I would assume the pcv is sealing. Thats really cool that it has its own catch can though! I am actually piecing together a catch can/ one way check valve for my pcv due to a little oil I saw in the manifold last time I had it off on my sr.

[gracekid]

hhhhhhhhhhhhhhhhhh

[nissan240boy]

Found boost leaks and sealed them, theres still a small leak around the intake manifold I tjink maybe an intake gasket but ill check pcv tomorrow, and the injector seals leak a little but I can fix that, also I topped out 1st 2nd and most of third and egts slowly got to 1280 so I believe my timing it close, its hard to adjust cause of my idle problem cause as the idle goes up and down the timing marks move so I got it close for now till I fix the idle problem, but the car is running better than ever since it was turboed

[nissan240boy]

Okay I added coolant to my car about a half gallon and started it and instantly my idle as almost perfectly steady after bout a minute it started becoming unsteady and after two minutes it was back to idling like crap, so y did adding coolant fix my idle for a breif time, coolant temp sensor? Oh yea also im trying out an nxs manual boost controller anyone ever try them good, bad?