R34 Missing, Running Rich

[so_tred]

I had my avcr installed last week and since then have only had problems with my car.

it was running perfectly beforehand and never skipped a beat. the car has an ARC fmic, 3" exhaust, pod..the usual basics.

the car used too boost to 10psi with the full exhaust on and never had any troubles..was nice & quick.

now for the problems,

the boost was set on 10psi through the avcr because when they tried 2 go any higher it would start missing..was told to change the spark plugs.

whenever the car is pushed past 4k the boost would spike to 11psi and start missing.

when I filled up with fuel I worked out I lost approx 100kms of driving with the amount of fuel used. I instantly thought its hitting R&R.

so I have set the avcr to allow the actuator to control the boost until I get it fixed up. it stopped missing high in the rev range but now its started missing on idle.

opinions on what the problem/s is/are? plugs,coil packs, R&R??

also the avcr should be able to hold 10psi without spiking to 11psi right?

Edited January 23, 2008 by so_tred

[R34NRG]

are u still running the std ecu?

honestly a could tune would fix it all up.

anythign u change to the car, uve changed how the car runs.

get it to a tuner, although it would be a big waste if ur planning more mods in the near future, slap everythign on 1st then get a tune.

[so_tred]

yeah,I've got an safc ii installed and a sitc ready to go.

I als forgot to mention..the car isn't running rich with the boost on only 6psi but its missing on idle.

just looking for some ideas..I get what ur saying about getting it all tuned and then see

[stolen_s15]

Check your coils mate, there is a thread in the DIY on how to check and fix them if they are stuffed.

[green 33]

Take it back to the place where you had the AVCR fitted and get them to re-check their work, if it was running with no dramas before hand it has to be something to do with how they fitted it mainly the connections to your standard ecu, i have not had a huge amount to do with the avcr but i know it connects to the injector signal from the ecu (could be causing dramas) i also know that bad or bridged earths between ecu's and piggybacks can cause various issues.

[adzR34]

yeah,I've got an safc ii installed and a sitc ready to go.

I als forgot to mention..the car isn't running rich with the boost on only 6psi but its missing on idle.

just looking for some ideas..I get what ur saying about getting it all tuned and then see

Hey samantha,

I just wanted to know if you had the same problem as me. I got similar mods to you cooler and 10psi boost on my auto r34, and i recently noticed its a bit more lumpy wen its idling, maybe missing? I was wondering if you had any ideas wat it could be?

Also i wanted to ask ya if you moved your auto box cooler? im thinking of getting a bigger one and putting it in the same spot?

Thanks if you can help

Adrian

[adzR34]

But i dont think the car is running rich as now that its running 10-11psi, it seems to be getting more km's per tank. does that seem normal for rb25's?

It seems to be idleing rough alot more after a spirited drive than after normal driving? Plugs and oil change have been done a few weeks ago..

Any ideas?

[r33cruiser]

check your plugs and get back to us. what do they look like? is it possible to upload a pic?

also what kind of plugs are u using, and are they gapped correctly??

i had same problem, all it took was a simple regap.

[adzR34]

check your plugs and get back to us. what do they look like? is it possible to upload a pic?

also what kind of plugs are u using, and are they gapped correctly??

i had same problem, all it took was a simple regap.

Yea currently im running the BCPR7ES at standard gap, recommended by the tuner, but theyre only about 700Km~ old

Im not 100% but could it be maybe the timming belt on its way? the car is ~65 XXXkm showing on the odo, and not sure if its been replaced..

[r33cruiser]

standard gap of 1.1mm????