So I posted a little bit over a month ago about an issue I was having with my V8. Unfortunately I've still got the issue, the problem is that it's intermittent, so pinning it is difficult.
Recently, driving home from my course, the issue struck again whilst I was crossing a large bridge with cruise control on. The car lurched back and forward throwing me around. Scaring the crap out of me, so I quickly turned cruise off and continued on my way, nerves extremely rattled. It happened a couple of times more (albeit not nearly as bad) a little further down the track.
Told my mechanic, he had a look, couldn't see anything obviously wrong with it so we left it. Soarer ran fine for a while, but it struck again at the shops near my fathers place, so I quickly dropped my mate home and limped over to my fathers. Luckily my mechanic lives across the road. This time the problem was happening right in front of him, sitting idle, it was revving up to roughly 1200, then dropping down to 200 and varying to all revs in between, just in general going all over the place but never stalling. Left it with my mechanic for a couple of days, found that what he believes to be a cam sensor behind the drive belt had been rubbing and worn through to the wire, he fixed it up, re coated and pinned it back to the block, drove it around, all was good. Picked her up on Wednesday and gave me no troubles for the rest of the day. Next morning needed to head out to the city. Revs started going all over the place again while I was driving out and only just manged to park it. Mechanic came out to me, but he couldn't do much due to the location, so I was left to try and drive it home. Barely made it three kilometers before it kicked in and only just got it off the road into a side street where this time it cut out to CHARGE just before I could turn her off.
I've got a Fuel Pump ECU that I've yet to put in it that I purchased off of Raphael as this was suggested as the issue previously. What other things could cause this issue, in case the ECU doesn't fix anything?
I also ran diagnosis this afternoon to find that the O/D signal flashes as it normally should, however the CAT icon just stays on and I am greeted with a dash message in Japanese that I couldn't find listed anywhere (Picture below). Hitting scroll gives me both 'OK'.
As always, apologies for such a long story, just giving you as much detail as I can muster.
NOTE: I should point out that I didn't reset my codes, so this has been here since my mechanic fixed up the cam sensor cabling
After many an hour spent, my mechanic managed to find that the cause was from the wiring connected to the Engine Speed Sensor. It had worn through and was pulsing the current.
With that fixed, it seems to be idling particularly high, as well as low. When you first turn it on from cold, it'll generally rev up to about 1800 and step down to roughly 1100. When driving and letting off the throttle it'll sometimes sit at around 1200 RPM, making it difficult to slow down, as well as come to a stop. A lot of the time it'll actually slowly gain in speed on a flat at around 40KMP/h. Otherwise, if it isn't idling too high, it'll idle too low, down around the 500 RPM mark.
Soarer has had the Fuel Pump ECU replaced with Raphaels one and has had the Mines ECU reset as well as the IAC Valve cleaned off. Both of us have noticed that the idle screw has been tampered with as well as the electrical unit next to it.
Does anyone have any idea how to get the idle speed to sit properly again?
The stepping down is not the issue, it's that it's idling much too high. The V8 as I've read is supposed to sit 700 when warm, whereas it currently sits at 900 - 1000 RPM. Prior to all of my trouble it'd start off at about 1400 RPM and step down more and more till 700 when it was warm. Currently at cold it sits at 1800.
-EDIT: I just went outside and turned it on just to test it. When it turns on from cold, it revs to 1400, sits, then slowly creeps upwards till at 1800. When you start it when it's warm, it'll rev up to 1800, sit, then creep down to 1200.
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