SevenAngryPenguins Posted December 16, 2007 Share Posted December 16, 2007 (edited) Hi, was after a few ideas of things to check with my r33, the problem is soon as it starts boosting up it missfires to the point it just doesn't run, just coughs and splutters, this happens at about 4 psi, as soon as i back off runs perfect. Things i have tried to do to rectify the fault is change, ecu, spark plugs (all came out totally black), afm, cas, ignition relays checked, igniter (the earth seems good too, I asume its the one that goes under one of the coil holding frame bolts), JJR coils went in about a week before this happened aswell. I haven't yet pressurised the system to check for air leaks yet but all the cooler pipes seem well sealed. cheers Edited December 16, 2007 by SevenAngryPenguins Link to comment https://www.sau.com.au/forums/topic/197788-bad-missfire-under-boost-not-coils/ Share on other sites More sharing options...
sidewayssam Posted December 16, 2007 Share Posted December 16, 2007 im having same problem aye, did urs start doing it suddenly? me mate put 95octane in his skyline and the thing just startn to get worse and worse missing, we changed the plugs and fuel filter but thinking mayb the injectors are screwed Link to comment https://www.sau.com.au/forums/topic/197788-bad-missfire-under-boost-not-coils/#findComment-3535804 Share on other sites More sharing options...
SevenAngryPenguins Posted December 16, 2007 Author Share Posted December 16, 2007 yeah happened straight up ran fine one day crap the next Link to comment https://www.sau.com.au/forums/topic/197788-bad-missfire-under-boost-not-coils/#findComment-3536066 Share on other sites More sharing options...
murrayis Posted December 16, 2007 Share Posted December 16, 2007 What new plugs did you put in? Link to comment https://www.sau.com.au/forums/topic/197788-bad-missfire-under-boost-not-coils/#findComment-3536110 Share on other sites More sharing options...
TTT Posted December 17, 2007 Share Posted December 17, 2007 Can you confirm the JJR coils are working (don't care if they are new) plug them in to a mates car with same motor and test them out. or use his ones on your car to test out. Link to comment https://www.sau.com.au/forums/topic/197788-bad-missfire-under-boost-not-coils/#findComment-3536244 Share on other sites More sharing options...
SevenAngryPenguins Posted December 17, 2007 Author Share Posted December 17, 2007 (edited) dont know anyone else with a 33, but i chucked the old coils back in and the problem is still there plugs are bcpr6es Edited December 17, 2007 by SevenAngryPenguins Link to comment https://www.sau.com.au/forums/topic/197788-bad-missfire-under-boost-not-coils/#findComment-3536295 Share on other sites More sharing options...
johnbarry88 Posted December 17, 2007 Share Posted December 17, 2007 check ur fuel pressure mines dont the same thing b4 on my old skyline Link to comment https://www.sau.com.au/forums/topic/197788-bad-missfire-under-boost-not-coils/#findComment-3536306 Share on other sites More sharing options...
SevenAngryPenguins Posted December 17, 2007 Author Share Posted December 17, 2007 ok will do, how did you go about testing the fuel pressure i have a fuel pressure gauge...did you test it at idle or on load Link to comment https://www.sau.com.au/forums/topic/197788-bad-missfire-under-boost-not-coils/#findComment-3536363 Share on other sites More sharing options...
johnbarry88 Posted December 17, 2007 Share Posted December 17, 2007 hook it into the fuel rail if its a standard pump at idle it should see around 40psi if this is the case then its alright but under load if it doesnt make anymore than that I would think your fuel pump would be dead. Link to comment https://www.sau.com.au/forums/topic/197788-bad-missfire-under-boost-not-coils/#findComment-3536377 Share on other sites More sharing options...
SevenAngryPenguins Posted December 17, 2007 Author Share Posted December 17, 2007 (edited) i put in a walbro a few months back and when it primes it sounds strong but i will still check it, how did you look at the gauge under load, i will have to get my little brother to sit on the engine while i boost down the road. Edited December 17, 2007 by SevenAngryPenguins Link to comment https://www.sau.com.au/forums/topic/197788-bad-missfire-under-boost-not-coils/#findComment-3536408 Share on other sites More sharing options...
johnbarry88 Posted December 17, 2007 Share Posted December 17, 2007 just feed it through the gap in the back of the bonnet and sit it under the wiper arm so u can read it Link to comment https://www.sau.com.au/forums/topic/197788-bad-missfire-under-boost-not-coils/#findComment-3536798 Share on other sites More sharing options...
SevenAngryPenguins Posted December 19, 2007 Author Share Posted December 19, 2007 (edited) after lots of stuffing around ended up buying a supercheap aircompressor to check for boost leaks and found a massive one so problem solved!! Edited December 19, 2007 by SevenAngryPenguins Link to comment https://www.sau.com.au/forums/topic/197788-bad-missfire-under-boost-not-coils/#findComment-3540952 Share on other sites More sharing options...
TTT Posted December 19, 2007 Share Posted December 19, 2007 where was the leak? just so others can check this as part of their diagnostics for similar problems. Link to comment https://www.sau.com.au/forums/topic/197788-bad-missfire-under-boost-not-coils/#findComment-3540978 Share on other sites More sharing options...
ZENNON Posted December 20, 2007 Share Posted December 20, 2007 front bottom IC pipe where it goes onto the FMIC Link to comment https://www.sau.com.au/forums/topic/197788-bad-missfire-under-boost-not-coils/#findComment-3543172 Share on other sites More sharing options...
SevenAngryPenguins Posted December 20, 2007 Author Share Posted December 20, 2007 it was where my first pipe off the intercooler joined with the crossover pipe just after it goes though the engine bay wall if that makes sense, it was joined with a silicone joiner it appeared as if it was perfectly sealed but the clamp was done up right on the edge of the metal pipe inside with a bit of air pressure it leaked like a siv. I'm a bit annoyed at myself that I didn't check the hoses more closely the first second and third time that i did it. Would of saved alot of stuffing around. a picture speaks a thousand words so they say Link to comment https://www.sau.com.au/forums/topic/197788-bad-missfire-under-boost-not-coils/#findComment-3543279 Share on other sites More sharing options...
ZENNON Posted December 20, 2007 Share Posted December 20, 2007 ah wells - now u got it i can use it to see if i have any leaks Link to comment https://www.sau.com.au/forums/topic/197788-bad-missfire-under-boost-not-coils/#findComment-3543316 Share on other sites More sharing options...
SevenAngryPenguins Posted December 20, 2007 Author Share Posted December 20, 2007 haha yeah, so when you wanna move that fridge..... Link to comment https://www.sau.com.au/forums/topic/197788-bad-missfire-under-boost-not-coils/#findComment-3543365 Share on other sites More sharing options...
ZENNON Posted December 20, 2007 Share Posted December 20, 2007 lol - *me opens msn* Link to comment https://www.sau.com.au/forums/topic/197788-bad-missfire-under-boost-not-coils/#findComment-3543396 Share on other sites More sharing options...
TTT Posted December 20, 2007 Share Posted December 20, 2007 GET A ROOM!!! Link to comment https://www.sau.com.au/forums/topic/197788-bad-missfire-under-boost-not-coils/#findComment-3543548 Share on other sites More sharing options...
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