Intake troubles !!! Anyone else experience this ??

[krazjon]

Okay, I put a new intake system on my 240sx (92) and now she does not want to run at all. It is acting as if there was an air intake leak between the MAF and the engine. Runs: at idle BARELY, doggs and chokes when you first step on the gas, and awesome when your foot is to the floor.

I went out and bought the best air/fuel meter i could get over the counter.It is showing as running very lean. I bought a different filter with more restriction and covered half of it in a shop rag to reduce flow, it helped a small bit, but not enough for satisfaction, it acts as though it wants no bigger than like a 1" dia. intake pipe !$#@

The origional intake runs across the radiator and into the 'cubby' on the other side of the engine bay... I didn't like this, so I bought a few different intake systems and made one intake out of it. The new intake goes up slightly and then over to the left and down (clearing the cumbersome radiator hose). The intake is in the order as follows:off the engine; 45 deg pipe, small extension, MAF, Cryo2, small extension, filter... the entire assembly is approx. a foot and a half long.

Has anyone else experienced this at all?? of know why it would be acting up... I am running out of ideas...

[Kaikias]

sounds to me like it may be a problem with MAF. Check the connections on the wires, if you have a volt ohm meter check it that way. Just a thought.

[Kenrik]

yes sounds like you either broke the MAF or did not hook it back up right.

[krazjon]

Okay, good call on the maf... I guess that I subconsciously overlooked MAF possabilities... in thinking of that... I wonder if I even have it in the correct way.. inside the MAF there is the reduced area which houses the sensor, that area is in a "cave" that only points to one side...

I have it pointed towards the filter.. this is correct right... or is the opening for the sensor itself supposed to point towards the engine for some reason ?

[DjPantsSpecR]

I also have this intake, make sure to cut out a nice hole where your headlight is, and make a really cheap cold air box, i swear to god thats the only way you are gonna make any noticable power. Its absolutely necesary to have that cold air box, however, that is not your problem.

What did you do with the big hose that plumbs into the intake? is it just sucking as much air as it wants? thats your idle air control valve intake, your mnotor is just sucking in a bunch of unmeterd air. You know how i solved this? plugged it with a spark plug. However in doing this the motor will want to kill when your fire it up when it is cold. you have to hold the rpms up manually for about five seconds and then it'll figure out how to run

i'm almost positive this is your problem. i hacked up a honda intake and there is obviously no room for this hose to go into, i'm sure you did a similar thing.

its a great intake, i'm just sure you left this hose open thinking it would be all good. but in reality you are just sucking in a gang of unmetered air. the computer only see the air coming in through the intake, thus your lean condition. i also witnessed this myself. additionally i smoked one of those large, large o-rings that seal the injectors to the manifold, causing a nasty injector air leak and a lean condition. i don't know why i said that... plug that hose with a flippin spark plug

[240crawler]

Opening points toward filter on s13. If the MAF is not hooked up, the car will idle great, but will not rev past 2800. Will also sound like crack-head spanish getting up there. My brother tried to be nice and change my air filter while I worked on brakes. He left the plug off, and I thought I broke a plug wire because I checked them at the same time. Cost me 59.99+ for this retard.

Where is the filter located? Next to hot things like radiator or exhaust manifold? Why do you have the CO2 injection on a stock 240?

[Kenrik]

Plug it with something cleaner then a sparkplug like a cap!!.. that's to ghetto for my taste sorry Djpants lol...

[VinceSez]

Plug it with something cleaner then a sparkplug like a cap!!.. that's to ghetto for my taste sorry Djpants lol...

lol

[DjPantsSpecR]

then again, it was the closest thing to me, and it just happened to fit the hole...

who am i kidding its ghetto, but so are 67% of S13's i know mine sure as **** is

but seriously thats gotta be your problem, you would probably notice anyother massive intake leak

[krazjon]

The top hose connected at the valve cover is re-routed (with pressurised hose) to the air filter itself on the far end of the cryo2 (so that any possible condensation will not get into the engine). The one below that is now connected to a short mini-filter (advance auto parts special) lol.

I tried a couple of basic ideas about the MAF and plugs. It still hits on the lean side during certain rpm's. I am going to bend a pipe following the same path as the origional intake, with all of the origional accessory hoses going into the original locations and basically start from scratch and work my way back.

I will be sure to post my finding and / or suggestions / comments.. etc

To answer a couple questions/comments:

1- the filter is located where the battery used to be. half in the fender and half below it (I cut a huge section out).

2- Co2 on stock 240 ... I tested the air volume and temperature going into the engine (as well as the average temp of the coolant with the stock fan setup ... scary as hell)) and did not like the outcome. The air going into the engine is WAY too hot. So I setup the cry02 system to help cool the air during the more intense driving times. The system also cools the fuel rail, radiator, and transmission cooler. I have installed the cryo2 on every car that I have built so far, and I LOVE the system. Most intense is the turbo'd Ford ZX2.. possibly due to the zx2 being the only VCT car I have had thus far, and it allowed for more versatility and intensity.

Which reminds me, when the time comes for a swap (as soon as that white **** start ruining the tracks)... are there any VCT engines out there that are worthy of a 240 home ? Definately has to be able to support HP :-D

Thanks

[DjPantsSpecR]

okay, guy, like i said, i have this exact same set up okay. the one that you put the mini filter on is the important one. you are letting it suck in as much unmetered air as it wants

the breather hose connected to the valve cover will not give you any problems at all. you need to throw your breather on that and route that other hose into the intake...

[krazjon]

That will definately be my next chore on her then. I didn't get the chance to spend any time on her this weekend unfortunately, but hopefully will be able to get some garage time in VERY soon. Have TRX250r problems now :-\gotta pay to play...

[ddgsxr504]

Send us pics so we can help you diagnose it. It could be your MAF or your intake temp sensor as well.

[elgarvo616]

if it was a MAF problem or someother sensor, wouldnt the ecu throw a code out?

[krazjon]

Here are a couple pictures and some details of what the pictures are.

http://www.angelfire.com/ill/c....html

A small start description of what the car has done at this point is at:

http://www.angelfire.com/ill/c....html

Thank you guys, your awesome.