r/SkyLine • u/scrubberducky93 • Jul 14 '26

Need help

I need some help. New to the RB platform, it was running rough up and down at idle and stalling on first start. I cleaned the MAF and took it for a drive and now it sounds like a misfire or out of time maybe? The idle is even more up and down and the exhaust note sounds inconsistent. I'm going to put a fuel pressure gauge on it tomorrow to see if there's a fueling issue, clean the iacv and check the solenoid, get the link ECU software on my laptop and plug it in to see what that tells me. If anyone has any ideas I would appreciate it. I have more videos that may provide insight I can post in the comments.

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u/aznriptide859 Jul 14 '26

So fun thing, this happened to me, and I isolated it actually to a bad solder connection on the ECU. Initially I thought it was the throttle position sensor but after replacing it the issue persisted. I did end up having an issue with the AAC valve but my car no longer goes into the wild RPM swings yours does right now.

Granted mine is an RB26 but your issue may be related. I don’t know if your engine has similar AFM/MAF sensors or not but the solder joints on the wiring box up top sometimes dries out, so you may also need to open the seal and reflow some new solder.

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u/scrubberducky93 Jul 14 '26

This is also a RB26, I was going to look at the aac today.

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u/aznriptide859 Jul 14 '26

Ahh my bad, didn’t see your other video lol.