Date: 2 Aug 2003 19:25:17 -0700 From: alancemornopsamo.com (Lance Morgan) Subject: Re: Mixture problems and lumpy idle
Paul Halliday <pjghnopsamyonder.co.uk> wrote in message news:<BB4F2F2C.817C%pjghnopsamyonder.co.uk>... > in article bgbnrv$l22cm$1nopsam52899.news.uni-berlin.de, Grunff at > grunffnopsam.com wrote on 31/07/2003 19:40: > > > Paul Halliday wrote: > > > > Okay. When I got home, the hissing was much less so than when I experienced > the lumpiness. > > snippage If you are hearing marked variation in fuel pump(s) noise at idle (is more of a whining/humming/buzzing to me), and there seems to be a correlation w/the lumpiness, fuel pump(s) and/or wiring/relay would be increasing suspects. But seems you're also getting different cold vs hot behavior Along w/checking fuel pressures (control pres, warm control pres, residual), ck fuel pump output volume (all should be in Haynes). When fuel pumps start to fail, they go pretty quickly - within hours IME (they've either been running weakish for a while - unnoticed - or have been subject to recent contamination of some sort). You'll get either severe bucking or a no-start Last quick thought is to ck that your Throttle Position Switch (TPS) is okay (continuity/no continuity) and adjusted to proper physical position
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