Engine dies when going from third or fourth or fifth to neutral

[Chikeen]

hi guys. my engine is dying if i am in either third fourth or fifth and go to neutral. also it dies if i go above a certain a rpm. any advice? im running a ka24de with various mods, including a 248 248 cam swap.

[Kingtal0n]

whats the wideband doing when it happens

-its probably the maf placement-

[FaLKoN240]

whats the wideband doing when it happens

-its probably the maf placement-

This or a huge vacuum leak

[Chikeen]

I have no Wideband

[Kingtal0n]

well then how do you expect people to diagnose an issue based on fuel? How do you know how much fuel is going into the engine and whether or not its burning properly?

If you want a guess its probably maf placement related. The maf requires non turbulent positioning, with straight pipe on both ends, and it needs to be placed far enough from the turbo and throttle body to avoid the small perturbations caused by the compressor wheel and water hammer effects of a shutting valve.

Other than that it could be a slew of issues, from air leaks to bad Oxygen sensor but without a wideband to backup data its just guesses. Need much more info
or suggest trying standard procedures,
compression test,
pressure tests (crankcase and intake pathways)
timing test

[brndck]

+1 for we need more information.
-was it running good before?
-did you CHANGE something, and then this started happening?
-when you say "various mods" we have no idea what that means. intake and exhaust? 300 shot of nos? roots style blower? cmon dude you've gotta provide useful information for us to be able to help you

[Chikeen]

+1 for we need more information.
-was it running good before?
-did you CHANGE something, and then this started happening?
-when you say "various mods" we have no idea what that means. intake and exhaust? 300 shot of nos? roots style blower? cmon dude you've gotta provide useful information for us to be able to help you

Short Ram
Intake K&N with stock MAF
Battery moved to drivers side
4-2-1 headers
Full exhaust system with 2.5 outlet
Coilovers Emusa
Custom seats with Tamata Belts
ebay Short shifter
Dual Exhaust Cam Swap 248 248
Ventilated Disks
Diff LSD 300zx
Strut bars (rear & front)
Gas Regulator
Electronic Fan
Z32 Fuel Filter

These are all the mods. I don't have a Wideband because the previous owner never got to putting it, and I am on the process of doing it. Then again, Im a broke college student lol.

[brndck]

Short Ram
Intake K&N with stock MAF
Battery moved to drivers side
4-2-1 headers
Full exhaust system with 2.5 outlet
Coilovers Emusa
Custom seats with Tamata Belts
ebay Short shifter
Dual Exhaust Cam Swap 248 248
Ventilated Disks
Diff LSD 300zx
Strut bars (rear & front)
Gas Regulator
Electronic Fan
Z32 Fuel Filter

These are all the mods. I don't have a Wideband because the previous owner never got to putting it, and I am on the process of doing it. Then again, Im a broke college student lol.

its definitely the ebay short shifter causing the problem :picardfp:

start by checking for vacuum leaks

[Chikeen]

its definitely the ebay short shifter causing the problem :picardfp:

start by checking for vacuum leaks

actually never gave me a problem. its been great so far. all the trouble started when i deleted the apexi safc 2 piggyback

[brndck]

what are you using for cam gears? iirc the 248/248 cam gear swap needs an adjustable cam gear to get the new cam into correct position.

[FaLKoN240]

I see a short ram intake, how far away is the MAF sensor from the throttle body?

[Rubber D]

Safc??.. do you have the stock maf and injectors?


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[fliprayzin240sx]

Safc??.. do you have the stock maf and injectors?


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Better yet, were there fuel trim corrections in that SAFC. Either way, car is bogging because its running rich when he comes off the throttle.