Swap Fuel Problems!! Please Help!

General discussion forum about the 240sx, and a great place to introduce yourself to the board!
UselessEngineer
Posts: 23
Joined: Tue Jun 17, 2003 10:13 am
Car: coding, computers, good literature, soccer

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I'm two months (:mad:) into my sr swap - I'm putting a s14 motor in a s13 car - so far EVERYTHING has been a pain in my a$$ from the hood not closing because the hot pipe comes up to far, to a gashed oil pan to wiring issues that would make a Kid Rock roadie faint. Right now I'm stuck on a fuel issue. Namely, there is way too much of it. I went with the 550cc injectors and upgraded fuel pump (Walbro), and yes, new Z32 MAFS and remapped ECU. Everytime I try and start the car I get a growl and maybe a sputter but then nothing...just like I had flooded the engine. I know the injectors are firing, I have spark, compression is good, the fuel pressure is good - essentially, I'm all out of ideas! What should I be checking? Help!


UselessEngineer
Posts: 23
Joined: Tue Jun 17, 2003 10:13 am
Car: coding, computers, good literature, soccer

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oops..sorry guys. in my angst fueled haste I posted to the general instead of the technical. My bad :(

Nathan
Posts: 5629
Joined: Fri Mar 07, 2003 6:43 am

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Are you certain that it is a fuel problem, ie: have you eliminated other possibilities such as timing, etc? If I remember correctly sr's use a tps that can get installed 180 degrees off pretty easily. This would still allow it to spark, have compression etc...but not start.

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912.0turbo
Posts: 756
Joined: Sat Jun 21, 2003 8:07 am

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Not the tps the CAS (cam angle sensor).Anyways,check timing and I would check the FPR to be sure.

candela
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Joined: Mon Feb 16, 2004 4:09 pm
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Yep the CAS is a culprit on a lot fo swappers...BTW- what ecu did you go with? JWT? Unless its settup for exactly 550cc injectors you will be running like *** even if you do get it started... bogging and possibly damaging the cylinder walls from flooding.

I would recheck your wiring to everything, the CAS, and fuel filter/fpr and all fuel connections to make sure the return isn't hook'd up to the feed (don't ask :cool: ).... good luck,

Austin

UselessEngineer
Posts: 23
Joined: Tue Jun 17, 2003 10:13 am
Car: coding, computers, good literature, soccer

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Yeah, I used Jim Wolf ( 2 months later.... :) - big line of customers apparently...) We've checked the CAS, the fuel regulator, the timing, etc. The mystifying part is that I'm getting accurate fuel pressure. The battery is a good Occcam's razor suggestion but I tested it , I know that's not it... - oh, the frustration :bash

Nathan
Posts: 5629
Joined: Fri Mar 07, 2003 6:43 am

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Uh...yeah...CAS is what I meant ;) I just mixed up my acronyms.


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