Something Wrong with Series II RB25DET

[lukits01]

I need help!! I hope somebody here can shed some light into my problem

I had a little mishap awhile back and had to replace my exhaust cam with HKS 256 with 8.8mm lift as well as my CAS and timing belt, About the same time my bosch 910 was installed in the car.

This was done by a mechanic that didnt seem to have great knowledge on import cars

It ran ok for awhile but the idle started to get rougher and rougher

it stalls sometimes at the lights and if I free rev it, it would stall

Now the car cant even idle, if I let go the throttle it would just stall

sometimes when Im driving and I let go of the throttle, the engine would start struggling (can hear popping in the exhaust) But it seems ok at higher revs or when the car is allready rolling but there is shit all power

Cold starts are horrible have to pump some gas and the engine takes awhile to start (can hear this strange clicking noise as well)

I know the car is for some reason running REALLY rich... the wall behind my car is black from all the crap that comes out of the exhaust, and 40L of fuel only gives me 200km

I've checked the engine for airleaks but there seems to be none. I've tried grounding the fuel pump, replaced the coils, the TPS and AFM seems ok because Im still getting correct readings from the SAFC. Yesterday I tried plugging a wolf3D I just bought and the car wont even start. Oh if it means anything, unplugging the O2 sensor didnt seem to do anything

My local mechanic seems to think there's something wrong with the timing, something about the CAS sending the wrong info to the ECU. because something wrong with how the cam was mechanically installed, been meaning to take it to an import workshop but thought I would get some opinions

Is this just because standard ECU cant take 256 ex cam? or is the CAS screwed? or maybe the cam wasnt installed correctly? Maybe a problem with fuel system?

so any ideas?

my mods are:

Trust MX cat-back

SS highflow cat

RSR front pipe with stock dump pipe

Apexi filter

TRUST V-SPL intercooler kit

SAFC-II

Greddy Profec B EBC

HKS 256 exhaust cam with cam gears

Bosch 910 external pump mounted inline without surge tank

malapassi FPR

Wolf3D on the side waiting for me to fix this problem

[Evil]

sounds like it could be timing... similar thing happened to my car after i got the timing belt done... car was running really rich and would pop all the time... at traffic lights it would stall... my mechanic just plugged in some sort on analsys computer (into the plug under the fuse box) into my stock ecu and found the timing was out. changed the timing and the idle a tiny bit and the car is better then ever

mods: fujitsubo cat back

safc II

avcr

fmic

[lukits01]

Mechanic allready tried changing the base timing but didnt seem to change much

But it does sound like some sort of timing problem

how could a timing problem cause overfuelling?

[Evil]

not sure how the overfuelling occurs - but my car used a sh!tload of fuel and backfired (especially under load)... my car also had no power... i had to get my safc retuned too

[lukits01]

Hey Evil did your problem occur right after you got your timing belt changed or did it slowly get worse and worse?

[jayR33]

Did you have the SAFC II retuned after you intalled the cams? Im guessing that you should get someone to look at your timing and air fuel ratios.

[Evil]

Hey Evil did your problem occur right after you got your timing belt changed or did it slowly get worse and worse?

it was as soon as i left my mechanic... i noticed the car had gotten louder and stalled at the lights... i went straight back and thought that the idle needed to be adjusted, had that done and left... it was a really rainy day so i did not drive on boost on the way home. the next day was nice and dry, i gave it some some and the car ran like a dog... got the timing adjusted, back on the dyno for an safc retune and the car has run great ever since... idle was set to 740rpm and my RSM shows that it only ever goes + or - 10rpm! car is smooth on idle and it sounds quiet again...

[lukits01]

Did you have the SAFC II retuned after you intalled the cams? Im guessing that you should get someone to look at your timing and air fuel ratios.

Yea I did have the SAFCII retuned and the car was running fine with 273rwHp for awhile but this problem started to show up and gradually got worse

[ylwgtr2]

Cold starts are horrible have to pump some gas and the engine takes awhile to start (can hear this strange clicking noise as well)

I know the car is for some reason running REALLY rich... the wall behind my car is black from all the crap that comes out of the exhaust, and 40L of fuel only gives me 200km

Its not a spark jumping sound you can hear is it?Maybe have a crack in a coil.....could also explain exhaust popping...or is more of a mechanical noise?

[lukits01]

I allready replaced my coils and it didnt change anything

The sound is only when Im starting the engine

it cranks over and then theres this mechanical click and the engine doesnt start

My local mechanic says the sound means the timing isnt right

[ylwgtr2]

dunno about that.......knackered hydraulic bucket maybe

[lukits01]

Hey Evil turns out my problem was the same as yours, sort of...

my bloody mechanic didnt tighten the CAS bolts and it was bouncing around as the cam was rotating

tightened it and set to 30Deg and all is well

thanks for the help people

[Evil]

good ot hear all is well again...

[lukits01]

GAGH! just when I thought everything was well

this damn problem comes back to haunt me.

My timing never seems to want to stick to 15deg

After a week of setting the base timing, the car starts to idle badly once again

when measured with timing light its nowhere near the markers but the CAS hasnt moved an inch!

I turned the CAS all the way to one side and the markers are still lightyears away from lining up

Sounds like a stuffed CAS or am I wrong?

oh and I have a HKS cam gear, Im just wondering if my mechanic installed it correctly, is the white dot on the outer edge (in between the teeth) suppose to line up with anything?