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Annoying falter/hesitation at 2500rpm
Posted by grlyd [Email] (more from grlyd) on Sun, 2 Apr 2006 17:29:35
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Vehicle is an immaculate '93 2.1 litres I have had since new that I converted 12 months ago to turbo (complete turbo swap from '89T and ancillaries but retaining stock EZK although with reduced compression and large number enhancements) There was minimal turbo lag when compared to a standard 900T with acceleration quite linear and rapid but of late it has developed an annoying falter at 2500 to 2600 rpm with the charge air just entering boost from vacuum. I can accelerate through this or hold it within the falter (breathless sort of stumble).
I have replaced: plug wires, distributor cap, plugs, FPR, checked over all induction and turbo plumbing and replaced any tired parts, replaced hooter valve, fuel pressure is ok, all vac hoses ok,
I have not yet: changed coil, nor tested the intercooler.
Idle is perfect and all rev range is ok during general acceleration other than say loaded acceleration in 1st and 2nd gears.
Once accelerated through this falter boost and acceleration is as before so I feel on the boost side items such as wastegate and actuator are functioning as boost holds solid at 12 psi as I have it set with actuator arm adjustment (6 psi actuator alone and 12 psi when with manual boost controller set)
Am I missing something here? suggestions most welcome thanks in advance.
posted by 58.170.4...
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