2 things check all vacuum lines boosted cars do that with vacuum leaks and vacuum clams tie wrap them also if its no that check vacuum lines there may be a cut in line
I installed a boost gauge on my X and sometimes it registers 7lbs but now its will not go over 2lbs. Doin the boost bypass is not a good idea better yet do a smaller pulley so your knock sensor is still active. I am replacing my knock sensor to fix my boost drop.
Although it could be a few things, but the reason why your only getting 2psi is cause the ECU is detecting that something isn't happy so as a safeguard it cuts the boost. The bypass/smaller pulley won't fix the underlying problem and just piss it off more. Knock sensor is highly liklely to be the problem. Check for a KS code in the ECU, it doessn't throw a CEL, but like mine, even if it doesn't, it was still causing problems. Probably was damaged in shipping to the dealership.
I'm not sure. I actually re-routed the vacuum lines to bypass the solenoid and the ECM adjust timing too. It works well for about a week until it ECM compensates furter. No codes, with the knock sensor recently replaced. I believe there's a fix for the '02 in getting it reprogrammed, but I've got an '03, so it may not apply, but I doubt it'll fix it anyway. I know the knock sensor is a common problem, but I think this is too, but most don't know about it since there's no boost guage.
2 things check all vacuum lines boosted cars do that with vacuum leaks and vacuum clams tie wrap them also if its no that check vacuum lines there may be a cut in line
fishman231123 1 year ago
I installed a boost gauge on my X and sometimes it registers 7lbs but now its will not go over 2lbs. Doin the boost bypass is not a good idea better yet do a smaller pulley so your knock sensor is still active. I am replacing my knock sensor to fix my boost drop.
ISBOOST300 2 years ago
Although it could be a few things, but the reason why your only getting 2psi is cause the ECU is detecting that something isn't happy so as a safeguard it cuts the boost. The bypass/smaller pulley won't fix the underlying problem and just piss it off more. Knock sensor is highly liklely to be the problem. Check for a KS code in the ECU, it doessn't throw a CEL, but like mine, even if it doesn't, it was still causing problems. Probably was damaged in shipping to the dealership.
Nd4SpdSe 2 years ago
Seems to be the symphome of a few conditions. On mine, it's an over-active (new) knock sensor, that I replaced with a 560k ohm resistor.
Nd4SpdSe 2 years ago
I'm not sure. I actually re-routed the vacuum lines to bypass the solenoid and the ECM adjust timing too. It works well for about a week until it ECM compensates furter. No codes, with the knock sensor recently replaced. I believe there's a fix for the '02 in getting it reprogrammed, but I've got an '03, so it may not apply, but I doubt it'll fix it anyway. I know the knock sensor is a common problem, but I think this is too, but most don't know about it since there's no boost guage.
Nd4SpdSe 2 years ago
Why does it do that? I have an '02 S/C xterra... I guess I'll find out if mine does that when I get the boost gauge installed.
aaronthemoose94 2 years ago