R33 Running On 4-5 Cylinders, Help Diagnose Problem

[J3TR33]

ok so here it goes, car is series 2 r33 DE+T, with mods in my signature,

took car for a dyno run to make sure afr's and ping was under control after getting a remap, didn't finish the dyno run as the coil packs were giving up and the car was breaking down...

car ran good after that jst misfiring a bit underload,

next day start the car and it sounded like a wrx, shuddering on idle, very lumpy,

i have read about this problem occuring when the coil packs are gone,

so i wanted to limit the problem to which coil it could be so i can get a second hand one till i get splitfires or JJR ones,

i took the cover off and connected everything back together, started disconnecting coils to see if there is any change in the engine noise or exhaust note

i did it to all 6, when i did it to coil 1 and 3 there was no change in engine noise or exhaust note, so i thought it could be these coil packs

changed the coils around with another two, and did the same test and still the same thing on 1 and 3

so im asking, what could be the problem, is it an injector problem, how can i check which injector is faulty, could it be a coil lead problem? or is my engine F#$$D

and btw just changed the spark plugs to BCPR7ES 0.8 gap, same day as dyno,

could it be a spark plug issue, might take them out tomorrow and have a look, what should i look out for?

compression test might be the last thing i do if nuthing else comes up,

any other opinions,

thanks

[eeiko321]

yes a faulty injector could cause a simillar problem.

but before we try and start to come to all sorts of conclusions....

firstly, were sure the Ignition leads are plugged in properly in sequence?

secondly, by any chance...did you wash your engine bay after the mods or overhaul?

ive had a same problem in my TT supra...i washed the motor and water got into where the spark plug sits...and caused WRX sounds....

[J3TR33]

yes a faulty injector could cause a simillar problem.

but before we try and start to come to all sorts of conclusions....

firstly, were sure the Ignition leads are plugged in properly in sequence?

secondly, by any chance...did you wash your engine bay after the mods or overhaul?

ive had a same problem in my TT supra...i washed the motor and water got into where the spark plug sits...and caused WRX sounds....

ye they all plugged in correctly, you cant really stuff the order up, its a no brainer as they only have so much wire running out of them,

nah haven't washed the motor,

pretty sure i have read that the only other thing it could be is injectors leaking or something, anyone know how to test injectors without taking them out,

[180or200]

take all the plugs out, unplug injector loom and crank the motor, if it's an o-ring you'll soon know!

[FordyR31]

I just had the exact same problem with my RB25DET and it ended up being a mix of shagged fuel pump not holding pressure and blocked injectors.... Pressure test ur pump 1st. It might flow ok but pressure test it to.U might find the electrodes on ur plugs have turned white from it running very lean under load. Also wouldnt hurt to check ur fuel pressure regulator to see if the diaphram hasnt broke.

Edited February 9, 2009 by FordyR31

[J3TR33]

take all the plugs out, unplug injector loom and crank the motor, if it's an o-ring you'll soon know!

so basically, take all plugs out, unplug the coil packs as they may spark, and unplug the injector loom,

and i'm guessing i watch out for petrol in cylinder 1 and 3, and it would mean that injectors are f*ked, as they are leaking,

will give this a go tomorrow,

and then clean out the petrol with a rag,

correct so far?

thanks man

[J3TR33]

I just had the exact same problem with my RB25DET and it ended up being a mix of shagged fuel pump not holding pressure and blocked injectors.... Pressure test ur pump 1st. It might flow ok but pressure test it to.U might find the electrodes on ur plugs have turned white from it running very lean under load. Also wouldnt hurt to check ur fuel pressure regulator to see if the diaphram hasnt broke.

the pump is a bosch 023 from ebay, how do i pressure test the pump?

thanks

[180or200]

so basically, take all plugs out, unplug the coil packs as they may spark, and unplug the injector loom,

and i'm guessing i watch out for petrol in cylinder 1 and 3, and it would mean that injectors are f*ked, as they are leaking,

will give this a go tomorrow,

and then clean out the petrol with a rag,

correct so far?

thanks man

will need to unplug coil packs to remove them, and if it's a leaking injector fuel should come out from the spark plug holes,

had this happen to fellow members car not long ago, was a cracked o-ring

have your injectors been touched at all?

[FordyR31]

the pump is a bosch 023 from ebay, how do i pressure test the pump?

thanks

Mine was a bosch 040 from ebay, a ford dealer in melb actually but bought on ebay. I dont know exactly how to pressure test it coz I didnt do it but I would think maybe putting a Fuel pressure guage after the fuel pressure reg, or just b4 it after the fuel filter and priming the pump with the ignition on???? Please if thats wrong someone say so b4 he does it.

New fuel pump, pressure reg and cleaned injectors and my car doesnt miss a beat on all 6 cylinders and goes a little better than ever.

[J3TR33]

the injectors haven't been touched since the conversion,

il try the injectors first, and then get more info on testing the fuel pump, all i can say is that i can hear the fuel pump priming nice n loud and got it installed at a reputable shop..

[rb30dett]

CAS swap it with a good one, I have seen a similar problem before.

[FordyR31]

the injectors haven't been touched since the conversion,

il try the injectors first, and then get more info on testing the fuel pump, all i can say is that i can hear the fuel pump priming nice n loud and got it installed at a reputable shop..

Just to add my pump was installed by Pro Maz in Melb and It was priming and flowing fine but was failing under pressure. Just because u can hear it and it flows ok in a flow test it doesnt mean it's holding pressure. Check everything in the fuel system u possibly can I'll link you to my thread, I went into a fair bit of detail of what happened and what was tried/suggested. Might be able to help u out a little.

http://www.skylinesaustralia.com/forums/S2...Lo-t252361.html

My car ended up having quite a few issues with it but the main problems that stopped it running were blocked injectors, fuel pump let go, hole in the diaphram in then fuel pressure regulator.

[J3TR33]

ok so in the last few days i have changed

injectors with the whole rail for another set of second hand ones,,, and no change

coilpacks with another set of second hand ones.. bought them from another member and told they were good nick... and still no change

what are my other options... thanks

[Traditimeour]

compression test might be the last thing i do if nuthing else comes up,

Tested compression yet?

[Dieseltrain]

Is it an Ecu issue ?

[J3TR33]

nah no compression test yet... i dont want to find out bad news lol...

il check my spark plugs tomorrow to see if they are in good nick, but i just changed them like last week..

il see a few mechanics that are open for some ideas... maybe go to status if they are open

[J3TR33]

if the car was running very rich like 9:1 or 10:1 could this f**k up one or two of my sparkplugs.. and therefore caus the car to run so shyt..

caus i changed the sparkplugs and put it on a dyno... there was a leak in the cooler piping and it was running very rich... fixed that then the coilpacks were breaking down and didnt have a proper power run... just a thought... we shall find out tomorrow...

[J3TR33]

spark plugs changed... no change in the car

next thing compression test...

[J3TR33]

Is it an Ecu issue ?

you were on the ball man,

took it to Trent at Status today and he had a quick look and told me to swap it with the NA ecu to see if idols properly,

and to my amazement it did, afterall it was just an ecu problem, the coil on cylinder 1 and 3 were not working, but with the NA ecu they are

now just a matter of getting another turbo ecu with the remap from toshi

thanks to everyone with their suggestions

never crossed my mind it would be an ecu issue

getting splitfires and back on dyno soon