Worked i6 idle and oil pressure issues... Ideas?
Ok, i've got a few issues at the moment with my EB II i6 4.0L GLi. Iíll start off by running through the work thatís been done to the car.
Quench head, additional head work, shimmed cam, new roller rockers and oversized valve setup; had a lot of hours put into setting up the rockers and proper gaps. Intake via the sequential bonnet scoop, and flowing out a set of pacemaker tuned equal length headers into a 2 Ĺ inch high flow stainless sports cat and 2 Ĺ sports exhaust setup, and a set of thematic fans out of an EL. Stage 2 shift kit in the 4 speed auto, hot gapped plugs, still running the original cam, original ECU, original GLi fuel system, original intake manifold, etc.
Right, now the problems.
1. Out of gear idle is ridiculously high. It had been sitting at about 1200 RPM, iíve managed to knock that down to between 1000 to 1100 RPM now so that it doesnít go into gear so hard. If I take it down any further then this, or set it up according to the book specifications it will start, idle fine, and stall the moment it goes into gear. I tweaked the idle a little bit higher and placed it into drive, it dipped all the way down and just about stalled but managed to get the idle up again by itself, but the moment its under load (fans come on or you turn the wheels) it will stall so iíve had to settle for an idle around 1100 RPM.
2. Oil pressure is fine when the car is cold, but as soon as it warms up its way too low. I was using Penrite 15W 60 prior and have done away with that because it was too thick when warm (although dash oil pressure gauge was still reading very low, I have the sports instrument cluster installed with appropriate oil pressure sensor) and have moved to GTX3 10W 50 which seems much better for the car when warm, but still the sensor reads very low, and I do have a slight ticking noise from the front of the car.
3. At revs above 3750 the car makes a vibration noise, it only does this when in gear (ie: it will not do it if the car is in Neutral or Park) and sounds more like something is vibrating against something else, not really an internal noise.
These are the major issues at the moment. Any ideas or suggestions would be appreciated. Due to my hours of work (and excessive amount of it) I have not had time to look at it myself or get it into anyone I would trust to look at it for me, so if someone with some experience with theses issues can save me some time by pointing me in the right direction it would be much appreciated.