Friday, April 28, 2006 - 08:55 pm, by: Khan Quach(Kayman)
Hi Guys,
I would like to commend you all on your parts in creating such a wealth of information!
Symptoms having only arisin after some work had been carried out, my V8 sounds as if it has some lumpy cams below 800rpm. All above 800rpm, it drives fine and smooth, apart from having to use the throttle to maintain idle. Having just spent the Easter holidays replacing shims(intake only needed via intake cam removal), cam cover gaskets and bolt washer/seals, rebuilding power steering pump, pulley bearings, dizzy caps and rotors, air filter, oil filter, Idle Air Control bearings. On reinstallation, I ensured all timing sequences of gears and belts went in the same through paint marking, photos and double checking through rotation that the cam and crank marks align, as I have previously changed the timing belt without any problems. I also readjusted the Throttle Position Sensor to specification as I suspect it may have been the cause of my idle problems after replacing grounding leads, IAC bearing replacement/clean, checking for vacuum leaks, regapped and clean plugs(NGK BKREP?? to 1.1mm) and new fuel pump ecu. I presume the car's running lean now on idle as is tends to heat up quick in "lumpy below 800rpm" mode whilst idling and gives off quite an intoxicating exhaust smell. No such heat problems on gentle drives around the block though. Prior to this Easter revamp, idle problems were never as rough as idle could fall to 350 - 400rpm before getting rough through manual adjustment of disconnected/desembodied IAC. I know this may be a highly variable matter, but any clues/ideas to what causes this kind of behaviour will be greatly appreciated as I'm losing the plot over these last 3 days and nights.
