screwy DE intake problem

[USDM240]

i just did the E to DE swap about a week ago and im very happy with the results. did everything myself..WOOT!

anyways, i had the cone filter and adapter setup on my SOHC motor and it worked fine. however, when i tried to swap it over to the DOHC, it would immediately bog down and stall out, but only when i placed the filter on. with just the adapter, it idled fine. the cone filter is brand new, has no dirt in it, and i even checked another brand new filter and it still does the same damn thing. is there something that i am overlooking? i know everything else on the motor and intake is hooked up correctly. and if this is a noob post, pardon the retardation, but i didnt see anything when i was searching.

[USDM240]

damn, no one knows anything?

[corn322]

anything inside the filter that could restrict airflow?also, this is a silly question, but it happened to someone else: is the MAF facing the right direction?

[Nismo1182]

I have a dirty KN Filter and it runs fine with and without it on. Try a diffrent MAF.

[USDM240]

anything inside the filter that could restrict airflow?also, this is a silly question, but it happened to someone else: is the MAF facing the right direction?

no, thats not a silly question, but it is facing the right way. the cone filter is BRAND NEW. ive checked it over thoroughly and even used another new one and both gave me the same results. as of now, i can run the MAF adapter and no filter and it runs fine. i can also run the stock airbox with a filter and it runs fine. it seems to only give me problems when i put the cone filter on. im completely confused. ive used the cone filter and adapter method on several of my other cars and never had a problem like this before. hell, even the SOHC motor that i had before ran fine with this setup. i must be missing something, but what?

[eddiec]

are there any other leaks in the intake tubing? maybe check all the vacum fittings hooked to the intake?

[pr240sx]

That the adapter is NOT blocking the small passage on the MAF.Try this, disconnect the MAF with the troublesome filterr intalled. The car will start but it will not rev pass 2000 rpm or so.If it does start, the problem is the adapter to MAF matching. Try turing the adapter or so.

A pic will help a lot here!!

[USDM240]

are there any other leaks in the intake tubing? maybe check all the vacum fittings hooked to the intake?

nope. checked all those and there are no leaks. all the vacuum lines atre hooked up correctly and none are loose.

[USDM240]

That the adapter is NOT blocking the small passage on the MAF.Try this, disconnect the MAF with the troublesome filterr intalled. The car will start but it will not rev pass 2000 rpm or so.If it does start, the problem is the adapter to MAF matching. Try turing the adapter or so.

A pic will help a lot here!!

as far as i can tell, the passage isnt being obstructed. i tried that method as well and im guessing that the adapter just isnt going to work on the DE MAF. thats weird though, because it worked fine on the E MAF.

does anyone know of another style of adapter that is plastic that fits directly even with the MAF? i had seen one of someones 240, but havent seen one since.

sorry about not having any pics. the digi cam has been down for a bit.

[pr240sx]

Well you can try to adapt the stock brass colored thing on the stock airbox to the filter.A good set of pliers and some spare time can do this.Just bend the lip straight until you can fit the filter to the outside of the air horn.

[USDM240]

Well you can try to adapt the stock brass colored thing on the stock airbox to the filter.A good set of pliers and some spare time can do this.Just bend the lip straight until you can fit the filter to the outside of the air horn.

damn, i hadnt even thought about that. thanks for the suggestion.

[oldsoul]

usdm240, how hard was the swap and what did you change/not change. i also have a d...that aint what it use to be and am lookin at the swap?

[USDM240]

usdm240, how hard was the swap and what did you change/not change. i also have a d...that aint what it use to be and am lookin at the swap?

not hard at all. i did the entire swap by MYSELF, with no help. you will need:

DE motor with all accessories (intake, ignition system, etc.)DE power steering lines, reservoirDE ECU and wiring harnessDE tach (the SOHC accepts a different signal)all refresh parts required (IE: plugs, wires, fuel filter, oil filter, vacuum hoses, etc.)

If you plan on keeping your A/C, you will have to either get a custom bracket made for the SOHC A/C compressor, or have custom lines made for the DOHC compressor.

The SOHC wiring harness has this really weird L-shaped thing on it at the firewall behind the heater motor. You will have to yank on it really hard, or cut the plastic to pull it through the firewall.

The tach will need to be replaced. Once you pull the cluster, there are three screws that hold the tach in place.

For the ECU, the SOHC has a body harness with a certain number of wires that run to it. (12 i think) You will need to cut the body harness connector off the SOHC wiring harness in order to connect the DOHC ECU and harness to it. Now, cut the DOHC body harness connector off, take the SOHC body harness connector and just match the colors. That simple.

I think thats about it in a nutshell. Took me seven days to do everything and thats because I was drunk half of the time. :ylsuper Just remember, its never as hard as it looks.

[USDM240]

almost forgot: you will also need the DOHC throttle cable and cruise cable if your car has it. the SOHC will work, but will be stretched tight across the top of the motor. just nasty looking...

[compression]

Is your filter bolting directly on the MAF sensor? If so, thats your problem. THe filter disturbs the airflow and confuses the MAF sensor, try adding a section of pipe between the air filter and the maf sensor. IF that is not the case, then ignore this post.+

[USDM240]

Is your filter bolting directly on the MAF sensor? If so, thats your problem. THe filter disturbs the airflow and confuses the MAF sensor, try adding a section of pipe between the air filter and the maf sensor. IF that is not the case, then ignore this post.+

ill try that out and see where it gets me.

[oldsoul]

thanks usdm240, lol.... but now that i think about it. it might be easyier to put my rims and suspenion parts o na 91...lol