z32 maf, 550's not idling
 

Installed the z32 maf and 550's, fired it up and the rpms immediately surge to about 3000, then slowly taper off and eventually the engine just dies after 5 seconds. During this time is a very loud whooshing/hissing noise. If I give it gas it is VERY lumpy, definately something wrong. I have the z32 maf angled flat as described in the stickies. Supercharger is not installed. I'm just running it N/A to [try to] get it working first.

Everything should be hooked up so I don't know what the problem is. The vacumn/boost gauge shows very little vacumn. I'm going to recheck everything again, but in the meantime does anyone have any ideas?

Honestly it feels like my friends prelude when his engine took a major dump and the engine ended up being blown. :(


EDIT: Problem fixed. Forgot about two bolts I removed on the backside of the intake manifold. Idle and drivability is now perfect!

Check the gasket on the intake manifold. Also check for other vaccum leaks

A ripped internal O-ring on one of your injectors ?? Did you make sure and lube them up nicely ?? Counld be simply a Vacuum line you forgot to plug in

-matt

Yup I lubed it up real good with vaseline. O-rings were brand new. Intake manifold gasket was replaced with a new one when I took apart the IM.

its your vacuum lines, im pretty sure, spray some water with soap onto where you might think a leak might be, then see if it bubbles up. Check everything carefully.

WHOOOO fixed it after drinking some beer. !!! Turned out to forgot to screw in these two bolts in the back of the IM near the firewall.. WHOOOO it idles like a dream!! WOOORD

Congrats :) Problem Solved

Ah...where the EGR connects to the IM. Massive vacuum leak for sure. Congrats...:)

Thats not how to check for vacuum leaks, to check for vacuum leaks just get a can of TB cleaner and start spraying until you hear the motor start to surge when a certain area is sprayed.

amazing how well 550's and a Z32 MAF will idle huh? What fuel pressure are you at?

Yeah but its a quick way if you dont have tb cleaner around.

THATS funny mine can't idle with even stock injectors i had it installed with jwt ecu and z32 maf and the car started and couldnt idle and i give it gas and as soon as i let off it died :eek: . i placed the maf in the same postion like in the stickies and still that's what happen atleast ten times and i gave it gas and it was feeling very lumpy and like the was something definatley wrong. i couldnt figure it out so i took out the z32 maf and the jwt ecu out , put the stock ecu and stock maf and the car idled and ran normal again. :hmmrun:

Go to sleep man.

I need to get an afpr to find out. Smells pretty rich though. 550's combined with the walbro 255hp will probably do that.

Anyway, finally got the supercharger on, but the charge pipe is still not hooked up because I'm still waiting on the flange for the bypass valve. Oh, after I bolted it all back on, I noticed the belt was really close to the center post on the plate. I didn't want to take any chances so I took it off again and ended up dremel-ing the entire post off. Did I mention the how tough that steel v1 plate is? I must have broken a dozen of those dremel discs before it finally came off.

And what's the trick to getting that oil return line hooked up? Took me forever to wiggle it on and tighten the clamp. :mad:

Ive done it soo many times without a problem. I put that on first as I lower the blower/plate combo onto the timing chain. Make sure you have the hose clamps on the return line not snug, and not lose either. From the top, take a long screw driver and push the oil return line farther on. It will slide down the return plate nicely and stay put. Once I get the plate/blower secure, I get underneath with a long extention with a tiny 1/4 (IIRC) socket on the end and I tighten it from underneath. Bring the screw driver underneath as well to pull the line a bit farther down (1/2"-1" more) BTW: I used two small hose clamps. Asking for only one to tighten that is asking too much IMO.

-matt

What injector size is the JWT ECU tuned for?

Do you have a wide band? SAFC?

Just make sure when you get the SC up and running you get a AFR reading when you first start boosting. You should be on the rich side under WOT, but you just want to make sure.

I'm going to head over to the local dyno shop for a quick pull to give me an idea how the a/f curve looks. SAFC and tuning will come in due time, depending on the outcome of the dyno.

Congrats Eric!! Damn, you don't waste any time!! Now I gotta do mine! (I just might call on you to help me put in my injectors)

Sure thing Jim. I did break the pintle caps on the first three stock injectors I pulled out, but after that I got more experienced at it so I have 2 or 3 good ones still. Gotta really pry those suckers to get em to move! Don't forget to order an intake manifold gasket too. I used a felpro (sp?) set from autozone.

BTW, you and Josh were right about that bend being 60 degrees. :shiner: I had to cut the 45 degree bend a bit on one edge to "make it" a 60 degree.

Teaser pic:

http://img280.imageshack.us/img280/2416/cimg00256lf.jpg

370's but i thought even thou they werent installed the car would still? or am i wrong

i tryin but its hard when own a maxima...lol:lolrun:

If the JWT ECU is tuned for 370's and a Z32 MAF, you better have those components in for everything to work properly.

Lookin good Eric! :thumbsup:

With your Z32 MAF, did you cut off the old harness or did you splice the new one in so you can go back to A32 MAF easily if need be? If so, did you use the "T" connectors? solder? How did you do it??

I have an OEM manifold gasket sitting in the garage next to my ....:grinno:

I chopped off the old harness but I left a little bit of wire so I could go back if I ever needed to. I used those crimp connectors where you stick the ends of the wire in on each side, smash it shut, and wrapped it all in electrical tape. Now that I think about it, I do have a soldering iron I could have used, but everything is working fine as of now. I also bought some 2-step colder sparks as a preventative measure. Gotta put those in later.

No, it doesn't work that way. It could have not ran for other reasons, but it was probbably due to having the wrong injectors.

oh ok bc the car ran on the jwt ecu with stock injector and a32 maf but as soon the z32 maf went it could not hold. so i tought was weird but i see i am wrong thanks mike