s_ikari2015
Fun IS easier with an 8
- Joined
- Nov 16, 2007
- Messages
- 697
- Reaction score
- 30
- Points
- 28
- Location
- Australia
- Members Ride
- '02 Monaro V2 CV8, '90 Toyota Sera
Hi I need serious help. Just spent nearly 10 grand on my V2 Series 1 Monaro LS1 (cable throttle) with a full engine reseal, head work, cam and tune and ever since it has a problem that happens more often than it doesn't.
As soon as the car starts moving, even in neutral (6 spd manual) the revs jump to around 1500rpm. Same if I put the clutch in and coast, it stays where the revs were or climbs to 1500rpm if it was lower.
Even worse, sometimes the bloody thing runs away to 3000rpm! It just goes nuts! Spot on 3000rpm.
About a second after coming to a complete stop it drops back down to the standard idle, around 750-800rpm.
Most of the time it just "floats" when changing gears, no matter the engine temp.
I've replaced the IAC valve, and has had no change. I've removed the intake pipe to visually see the throttle body when it's idling high and it's not opening (I thought maybe the tune had someone messed with the cruise control module, yeah, left field I know). I've unplugged the IAC when it was idling fine, and the car just sat there idling fine. I turned it off and started it again, it went to around 1000rpm for a bit, then up to 1500rpm until I plugged the IAC back in, then a second later it was back down to 750/800rpm normal idle.
I've taken it to the tuner, and no freaking surprise the damn car drove perfectly for them. They suggested it might be a bad engine earth, so I fitted a new earth straight from the drivers side head to the negative terminal. First drive after, everything was fine. Second drive, back to being mental.
So, how does the ECU actually control the idle? What sensors does it use to determine that?
Is it just me, or is the tune cactus? They had to replace the ECU because my eBay special MAFless mailorder was "locked" and they couldn't use it. Have they supplied a dodgy ECU, or have they screwed the pooch on the tune?
Please help, I've lost the love for my Monaro, and that has made me deeply depressed.
As soon as the car starts moving, even in neutral (6 spd manual) the revs jump to around 1500rpm. Same if I put the clutch in and coast, it stays where the revs were or climbs to 1500rpm if it was lower.
Even worse, sometimes the bloody thing runs away to 3000rpm! It just goes nuts! Spot on 3000rpm.
About a second after coming to a complete stop it drops back down to the standard idle, around 750-800rpm.
Most of the time it just "floats" when changing gears, no matter the engine temp.
I've replaced the IAC valve, and has had no change. I've removed the intake pipe to visually see the throttle body when it's idling high and it's not opening (I thought maybe the tune had someone messed with the cruise control module, yeah, left field I know). I've unplugged the IAC when it was idling fine, and the car just sat there idling fine. I turned it off and started it again, it went to around 1000rpm for a bit, then up to 1500rpm until I plugged the IAC back in, then a second later it was back down to 750/800rpm normal idle.
I've taken it to the tuner, and no freaking surprise the damn car drove perfectly for them. They suggested it might be a bad engine earth, so I fitted a new earth straight from the drivers side head to the negative terminal. First drive after, everything was fine. Second drive, back to being mental.
So, how does the ECU actually control the idle? What sensors does it use to determine that?
Is it just me, or is the tune cactus? They had to replace the ECU because my eBay special MAFless mailorder was "locked" and they couldn't use it. Have they supplied a dodgy ECU, or have they screwed the pooch on the tune?
Please help, I've lost the love for my Monaro, and that has made me deeply depressed.