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Hi all, This will be my first post on the forum, so bare with me. I have searched more threads than I can count related to this, on here and other forums. If the questions I am about to ask are already posted and answered here, I do apologize, I could not find them. OK! Lets begin! I have a 1994 MK4 Supra NA-T. so consider it an NA for the purposes of this. I had a rear ender the other month, purely cosmetic damage, and this was all repaired and I picked up the car and drove it for a full 3 days without any issues. Then the other day I was driving and as I stopped at the lights my idle was jumping between roughly 250-300 and 900 (car normally idles at 850). Car would stall from time to time when braking and stopping at the lights due to the revs dropping so low. I have been troubleshooting this for the past week. Initially I read that a dead battery can cause the CPU to have issues, and my battery was dead and needed to be replaced just before the accident (got rear ended on way to get new battery), so the car was sitting in the workshop with a dead battery for about a month. I will list the things I have tried and lets see how we go... - Changed spark plugs (needed changing anyway) - Changed spark leads (NA has the distributor and leads) - Found a bunch of leaks from my intercooler joiners (realigned everything and got rid of the leaks) - Checked for vacuum leaks (couldn't find any additional ones) - Reset the ECU - Checked timing belt marks (no tooth has been missed, timing is in correct position) - Adjusted TPS (changed the idle higher and lower but was still hunting from very low to around the 1000 mark) - Cleaned throttle body Lastly, and my suspected culprit. I noticed there was little to no difference in idle when I disconnected the IAC while the car idled. After more hours than I would like to admit getting the IAC off due to the screws being super soft and just rounding, I finally got it off, cleaned it as best I could, and cleaned the throttle body. The IAC gasket looks to be in good shape. I have tested the voltage of the IAC, which turned out fine, and the resistance of the connector which came up at 22.5 ohms across all pins (not sure what standard is meant to be, couldn't find it in TSRM) I read that on all cars the IAC is meant to push out and in with the ignition switch on and off. So I tested this while I had it plugged in but not bolted into the throttle body, and it did not move in or out. I then created a vacuum leak and started the car, and the IAC did move out and back in when the car was turned off. I am not sure if this indicates that it is working correctly since it moved, or if it is still not working correctly as it did nothing with the ignition on and off... This is pretty much where I am at, and would like some ideas or opinions on whether to replace this IAC, or test some other things on the car first. This is my first time ever looking at an IAC and I want to make 100% certain it needs replacing and is the likely the cause before spending more money. Currently as it stands, the car seems to be idling a little better, possibly due to one of the other things I did, but it still idles rough. Dipping between 600 and 1000, before stabilizing around 950. If I blip the throttle the dip gets worse and then it seems that the ECU tries its best to stabilize it again around 950, constantly moving up of down by 100rpm or so. The other day the car would start and stall almost immediately when the IAC was plugged in, and then start normally when I unplugged it, so I am not sure if its working intermittently or that was a one-off as it hasn't done that again since. Thanks in advance for any help, and sorry about the long post, just trying to give as much info as possible as I have run out of ideas. Attaching pictured of my IAC. Part No. 22270-46050 https://imgur.com/vNDCQcM https://imgur.com/rOk2s6c https://imgur.com/8WSLbJS

Hi I have a 2000 AE112 Corolla that's having problems with acceleration. On cold start up it sits below 500rpm for few seconds and almost stalls. Then it goes to normal idle rpm. When I drive the car, it has hardly any power until it hits 2000rpm. I flat foot it and hardly moves and jumps like it wants to go more but can't. After 2000rpm everything works fine. I cleaned carbon buildup from inside the throttle body and it didn't change anything. Does anyone else have any ideas what I should be fixing?

Hi Gurus, I’ve noticed a small rattle with my 2014 RAV4 Diesel manual with 21k kms on the clock. I first heard the ‘rattle’ when in neutral whent the clutch is engaged. When I press the clutch in the rattle disappears. The car drives normally with smooth gear changes and no noticed difference in the clutch pedal feedback/pressure. Having noticed it, I hear the rattle throughout the gears although its hard to hear clearly due to the diesel motor sound and road noise. I did stall the car last week at low speed and I think I’m just being paranoid but I can’t remember the noise being there before. I only really noticed it a couple of days ago. I read about throwbearings or clutch springs being loose making rattle sounds but I suppose it could be something else entirely. I’ll take it into Toyota this week if I an but I’d like some expert knowledge in case they tell me to replace the clutch! Thanks in advance! Pete

Quick question: how much does your AC idle-up increase your idle speed? As in, what RPM does your engine jump up to when you switch on the AC at idle? Asking because mine ups it by around 200 RPM, which seems a little low.

Hi, My partner has a 1996 2.8L Diesel Hilux the 4door steel tray back ute, and on idle it shakes the entire car, yet when in gear or throttle it will smoothen out. It didn't always do this. It started happening after the gearbox and clutch were replaced, and she thought it may have been the engine mounts so she got someone to replace them. What could be the cause of this? I feel it may be a timing issue, or that the gearbox wasn't fitted properly. When the car is in idle and I stand next to the engine it shakes and when I play with the throttle cable it smooths out. Any and all advice is welcomed please. Also, does anyone have access to an engine diagram or an engine manual for this car? I contacted my local super cheap and repco and they don't have anything. I've uploaded a picture of the engine if it'll give you any information about the case.