My Neo Engine Goes Wrong. What Could Go Wrong?

[putraged]

hi

my engine goes wrong but i dont know which part of it. its a RB25DE NEO (N/a). it was fine 2 days ago, then i tried to do skid-pan in a parking space at night.

and here comes the trouble, suddenly the engine revs hard and stalling. i restart the engine and then the engines starts to shake hard, even if someone sit in the backseat he can still feel it. it shakes hard in every RPM, i thought it was the gearbox (clutch & flywheel & etc) but it was fine because i still can change the gear and use half-clutch as well.

i'm starting to think abt engine problems (ignition or injectors):

1. the engine loses its normal accelerations and it breaths harder.

2. now my muffler sounds like a boxer engine (not a smooth inline 6 when revving = less exhaust gas) when accelerate.

3. Engine Dampeners seems fine and nothing's bend or tweaked.

4. no white smokes (no oil burnt = pistons fine, i guess)

5. i just changed fuel filter + FPR (fuel line should be fine)

6. timing belt is fine (no miss-timing cams etc)

but

i haven't check spark plugs, coilpacks & injectors (how to DIY check?) yet.

what could be wrong? any inputs? or should i put video with my engine sounds like a WRX on it?

thanks a lot.

Edited August 18, 2009 by putraged

[putraged]

anyone care enough to share.

[mad082]

so what exactly were you doing when it let go? doing a burnout? revving hard?

it could be one of many things. you could've broken something internally ranging from anything in the bottom end to the top end. look for any signs of holes in the side of the block. it could simply be that a spark plug or coilpack has died, or an injector has died. or the fuel pump or fuel pressure regulator.

either way, i think your best bet is to take it to a mechanic

[REDGTT]

If it sounds like a wrx then its misfiring. Check your AFM , coils and plugs first. I bet its something simple.

[mad082]

it could also be that a hose has come of somewhere.

[putraged]

yea i was thinking of misfiring too, since i smell more unburned fuel in my exhaust.

that means, i have to unbolt the intake plenums to gain access to coilpacks?

i didnt do burnout, just doing 2 skidpans. revving until 7k for 5 sec. but never checked engine for almost 6 months.

thanks a lot.

[mosquitocoils]

You really should check the engine yourself every week or so, even if it's just for the oil and coolant levels, and to quick go over everything making sure all hoses are still connected properly, all bolts done up properly etc etc. Letting it go for 6 months is just neglectful.

Let's say it was low on oil, and you've smashed it up to 7k and held it there.... I dunno, it just doesn't seem good.

I would start with the things that are easy and cheap to fix, like sparks/coilpacks and AFM (as already mentioned), check all your hoses, plugs and fluid levels, and maybe take it to a mechanic if this doesn't solve anything.

[putraged]

i did oil & coolant levels, i even changed my oil every 5000 kilometers by myself. changing oil & fuel filter.

but i never check coilpacks looms, sparks, injectors for 6 months (the 20k Km tune ups), because too many hassles to unbolt the whole intake setups.

ok, what should i do next is:

- open intake plenum systems

- checking coilpack looms with multimeters

- checking coilpacks (what to check?)

- checking spark plugs ( how many 'mm gaps)

- checking injectors (how?)

thanks a lot.