MAF ca18det vs Z32 question

[Luchitosan]

Ok, i'll start from the beginning of the problem.I purchase a nice S13 ca18det but it have some issues, for example the turbo valve was disconected (always open) so the car runs like an NA (no like a turbo car), when i connectthe valve again when i push hard the power, it do like a explotionsfrom the exhaust and don't up the revs...stays at 3000 rpm or 4000, etc, but if i progressively ups the revs fine with some stumbles but runs better.In the nissan workshop the guy said the MAF was running bad, so i have the Z32 maf for tune-up in the future, but it will runing good if i plug it now it's all the standart set up ???

If not running good the Z32 where a can find a good used maf or new maf for the ca engine?(In some days my girlfriend go to miami and she can receive it there)

(i planning to change the fuel pump for a 255 lbs and a nismo fuel pressure regulator too )

Thanks and salute to all !!! Luchito
Modified by Luchitosan at 8:49 AM 3/26/2010

[boost_boy]

Ok, i'll start from the beginning of the problem.I purchase a nice S13 ca18det but it have some issues, for example the turbo valve was disconected (always open) so the car runs like an NA (no like a turbo car), when i connectthe valve again when i push hard the power, it do like a explotionsfrom the exhaust and don't up the revs...stays at 3000 rpm or 4000, etc, but if i progressively ups the revs fine with some stumbles but runs better.In the nissan workshop the guy said the MAF was running bad, so i have the Z32 maf for tune-up in the future, but it will runing good if i plug it now it's all the standart set up ???

If not running good the Z32 where a can find a good used maf or new maf for the ca engine?(In some days my girlfriend go to miami and she can receive it there)

(i planning to change the fuel pump for a 255 lbs and a nismo fuel pressure regulator too )

Thanks and salute to all !!! Luchito

Make sure they test the AFM to make sure that it is indeed the problem. If it is, I should be able to provide you an AFM via your girlfriend if she comes to Miami.

Dee

[Luchitosan]

Hello Dee, i really don't be sure of that, but this monday i 'll check it by myself.Do you know the standart setup of the AFM to check it ?Give me your mail adress in case that the afm don't work ok...jeje

ahh, this is my video...in spanish

http://www.youtube.com/watch?v=a2DG6z5yvTA

Salute and many thanks for help me, Luchito !

[Luchitosan]

Well, i check the maf and it's all right, may be i change for the walbro 255 and then i tell you... if not i see the FPR

Salute, Luchito

[Ass0]

One more thing about rev's lag is spark plugs. I had same problem in my CA and the reason to that was too big spark plug cap (it should be around 0.7mm to 0.75mm) I adjusted that with feelercauge after that engine was running smoothly up to 7600rpm (revlimiter)

Good Luck

[Luchitosan]

Ass0, thanks for the advice, if it's that the problem, i'm kill myself for be such an ...(you know, jeje)

Pd: excelent ride, red just like mine ! good machine !!!

[Ass0]

Thanks More pics: http://www.minunauto.com/auto/22634

P.S: red is THE colour for s13

[Luchitosan]

Good page, i don,t understand the language of it, but some things i understand like the mods, great ride, and YES my friend RED it's the color for me too..jeje

Salute Lucho

[Ass0]

Good page, i don,t understand the language of it, but some things i understand like the mods, great ride, and YES my friend RED it's the color for me too..jeje

Salute Lucho

Yes I would be very suprised if U uderstand language..

[croustibat]

Z32 MAF wont fit without changing the VQ/VE map in your ECU chip ( short answer : no it wont work)

if the MAF is knackered and the ECU detects it, the engine goes on default mode and does not rev past 2500rpm. So the easiest way to tell is to disconnect the MAF : if it runs all the same, the MAF is dead.

but if the turbo was disconnected, maybe it was because it is the culprit.

[Luchitosan]

Hello Croustibat, thanks for explain me why does not work the Z32 without change the map.When i purchase the car with the turbo off, it's goin fine all the revs, but when i put the turbo "on" start to do this... (see the video, if you don't see it till now).And yes when i disconnect the MAF the car runs worst, and just to make sure i check voltage out of the car like the FSM shows and it's work fine.What any other cause do you think ??? can be beacuse the turbo it's nearly to die, runs like this ??? Thanks man , Luchito

[croustibat]

You can try to clean the AFM (beware, it is very fragile) and see if it is the problem, but if someone told you the AFM needed to be changed, it is most certainly knackered.

i think it is related to air metering, so either your MAF has a problem ( check its voltage output with the engine is idle, i think it has to be arround 1.35V but this is from the top of my head and may be false), or most probably you have a boost leak. You can spot this easily with an AFR gauge, even a small boost leak will cause the car to run lean off boost and rich on boost.

Or try spraying something like carb cleaner on joiners, if the engine revs then you found your leak.

If you still have the oem fuel pump, it is most likely related too, get a cheap walbro or an expensive bosch 040 or 044.

forget about the fuel pressure regulator, it will be a pain to remap and is not needed.

[Luchitosan]

Well, go step by step:

1- The MAF it was cleaned by me with a wd-40 i sprayed all inside and outside2- I check the maf but don't w / te car idle ...i will check it later3- The AFR gauge: a friend of mine have it the complete wide band and gauge (Innovate) in his car, i'll borrow it. do you know the values to have a point reference ? or any car it's all the same ?4- I seach for a leak on the joiners by eye, jeje i ll check again better5- Tomorrow i'll put the walbro and see what happen6- The fpr i don't buy it yet, only if i need it...

Do you know where i can find a good used maf this weekto ship to miami, because maybe i destroy mine when cleaned it ???

(Boost_boy offer me one i send a PM today)

Thanks you, man !

[croustibat]

Can't help you getting a MAF as i live in France

1/ yes, you probably damaged your maf using wd40. This product tends to coat things it is used on. You need an alcohol based product.

3 & 4/ once calibrated correctly, you should be getting around 14.7 on idle. If you get 17+ values, you most likely have a boost leak or a dead fuel pump.

Watch for numbers when the car is hot, the ecu adds fuel when cold. If you get something around 12 at idle when hot, it may be the engine heat sensor that need changing (when it fail, the ecu detects the engine to be always cold)

4/ you can hardly detect it by eye, hence why you need to use a product

5/ i think the walbro will cure your problem, most likely.

[Luchitosan]

Ok, yestarday i change de puel pump.The car it feels so much better, it revs all form 850 rpm, it doesn't havethats explotions for the exhaust at 2500/3000 rpm, but...still has a little fail, so i leave the west gate open (like when i purchase it)and its better so now i,m goin to change the sparks (like said Ass0),clean all the maf and check the impedance of sensors.whit a correct fluid.Tomorrow i, tell you how it goes...

Thanks by now i'm getting progress

[Luchitosan]

News:

Yestarday i change the sparks plugs for the standart denso.and clean the maf, all the contacts and test the most sensorsResult:all works fine and the car run the same way, except the heat sensor test works fine but when i disconnected the car run good, more smooth at 1000 to 3000 revand feels more powerfull. My be the wiring to the sensor its bad ?And the 22 april receive my own wideband so its better for me.i try to make a new video with the progress...so you can tell me what youthink !

Well salute and stay in contact !

[croustibat]

You can also make an ECU diag, i dont know exactly how but there is a procedure to check temp & knock sensor with just the ECU.Try to find the service manual (i have some links for this but they are in french, so i think it will be useless to you).

[Luchitosan]

Sorry i´m late, today i clean the inyectors in a good store, and the try to check and change the Temp Sensor, see what happen...
You're right i'm must do de ecu diag but to be honest i've fear to do something wrong or goes bad and break the ecu, but really i'm goig to do anyway if don't go better with the clean inyectors and new temp sensor. i 've to read carafully the procedure to diag...

At this weekend try to up a video with the car...

Salute !

[Luchitosan]

Update sunday 18:
The inyectors where OK, nothing bad.The guy before clean it, put in the machine to test it and cubicated 370 cc each so he didn,t toch it.
My girlfriend comes from miami this 22th with the FPR Nismo, i think it,s better wait till then ...because put out the fuel rail it,s a pain in the as... so in one time put the inyectors and the fpr in the rail. Ahhh she brings me my wideband so more close to now that happen in the engine.
But i do the ecu diag before i put the wide see what tells me....

salute. Luchito