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Re: 95 SE/T: Boost neve goes above mid-orange
Posted by Dean (more from Dean) on Mon, 23 Aug 2004 10:39:05
In Reply to: 95 SE/T: Boost neve goes above mid-orange, Newzpix, Mon, 23 Aug 2004 08:33:47
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blow off or BPV?
When the BPC valve fails, it exibits such low levels of boost. But ones are costly. A MBC would be ok if not adjusted to high boost. If you want high boost, mods have to be made to lower intake and exhaust restrictions.
You can do a careful trial to determine if the system can generate and hold higher levels of boost by removing the hose at the wastegate. Be very gentle on the throttle. At any sign of knocking, get off the throttle and restore that connection. If you can make lots of boost, then there must be something wrong with the control system. When boost hits 40 - 50% thru the red, the ECU will stop triggering the injectors and you get a fuel cut. This can feel very abrupt in the lower gears. This situation resets itself as soon as the pressure drops a bit lower and that takes a second or two.
If you cannot make boost, look for loose clamps, damaged hoses etc. If you had a hose popped right off, you would be making zero boost. BPV VAC line connection to TB needs to be inspectd. The BPV will not hold boost if that hose is leaking. That line on a '95 will be crumbling to dust if original. Remove BPV return hose and feel that the valve is open at idle. If so, the valve works and the hose is ok.
posted by 65.68.10...
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