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update to this whole mystery it ended up being a improper seating intake valve. I ended up putting some work into the head getting new oem valves, crower springs & fresh seals since then no more cylinder 4 misfire. even went ahead and slapped on the BNR S4 i had waiting around.

Any part in specific i should focus on when cleaning the HPFP ? also got a WOT & idle log

Lately I've been having a issue where the car will randomly run lean at idle. Some times when the lean condition happens the HPFP psi will drop down to the lower 400s. Other times pressure will hang around 420-430psi but will still lean out. At times even getting to 16.38 for a second or two. I...

update to this whole mystery it ended up being a improper seating intake valve. I ended up putting some work into the head getting new oem valves, crower springs & fresh seals since then no more cylinder 4 misfire. even went ahead and slapped on the BNR S4 i had waiting around.

yeah just placed an order for one now gonna see how it all turns out once it arrives, i have had a ebay downpipe for a while now and it lasted me well

Have you used this downpipe in the passed ? tempted to buy it for mine

are you running 91/93 tune and then having to mix in a gal of e85 to try and comp for the knock ? I’m on my 3rd revision from Justin and see at most a quick spike of 3.5 and then will drop to 1.7-2.5 kn trying to see if this is normal or if this is something else I should be putting more...

what is normal boost vacuum supposed to idle around? lately mines been fluctuating from -8.4ish to -7.8ish at idle and also getting p02187. Also notice a crack on the downpipe pre o2 sensor would this lead to both the p02187 and low vacuum issue ? or should i be looking into injectors ?

i wonder what happen in the end...

Could collapsed occ lines cause a rich at idle state ? Currently under going same issue where lines are collapsing on both in & out ports

My car has been going rich out of no where at high speed low load and i cant seem to find whats causing it to happen. I've attached a log of the car going rich (12) then coming back out to (14). If anyone sees something I'm not please let me know.

Finally got some free time and was able to find, after a some diag the root of the issue, the ground wire pin for cylinder 4 was completely pushed into the connector causing it to short out the spark. I went ahead and changed out the engine harness with one i had laying around and it hasn't...

For the longest now ive been having a cylinder 4 misfire that will come and go out of random. Ive gone through and replaced a ton of hardware( spark plugs/coil packs/wiring harness/fuel injectors and seals/ fuel rail and injector harness/) only time I've noticed a difference of the problem...

I just put in some new ITV 22s in about a week ago I'll give them a try and see what happens. Still misfiring just on cylinder 4 i got a log during it misfiring ill post up and see if you guys notice anything I don't see.

By any chance would you happen to have a data log of whats going on with your car? I'm noticing that whenever it does misfire my STFT will sometimes compensate supper hard, in one case it corrected 33% during its misfire period. Not sure if this is due to lack of air or fuel but AFR holds steady...

Hey dude I’ve been having this issues for the longest as well I’ve change out all 4 injectors and changed out spark plugs and the issues is still there. Have you found or heard our any solutions. Ima at a lost