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This was a schematic I found that was useful in describing some of the key ECU inputs associated with the fuel delivery system. I worked my way through this list.

Hi team and also @Icebaby - I did find a fix and ended up posting my solution under another thread. Solved due to great inputs from the other members. In my case I was getting good linear rpm through to about 2100rpm and then a bunch of surging and loss of power overall. I ended up replacing...

SURGING FINALLY SOLVED!!!!! After getting to the point of having very few remaining options, and convincing myself it was an ECU issue - I went back through the listing of ECU inputs that I found in the schematic below (I included the full extract in a previous post). Using Techstream I...

Good evening team - hoping everyone is well!!! Apologies for the delay, it’s been hectic here in Brisbane the past few weeks. As expected, the wrestling with Toyota has taken many weeks and to be honest has been rather pointless. After taking the workshop manager for a 1 hour drive to...

Hey team - thanks for the info and comments - genuinely stoked for your input and ideas. I have done the SCV and went for the new longer version via Fourby4. Not a noticeable change unfortunately. I’ll certainly chase TonyC down - as I am pretty skeptical about Toyota. Car is currently in...

I had thought there might be issues with the fuel delivery. Here are screenshots of the fuel pump pressure test done via Techstream. When car is running it ramps fuel pump to max output, which forces engine to about 2100rpm (no load). Interesting the pressure fluctuations - I posted to...

@karl2000 - I’ve been trying my hardest to collect tech stream data on a range of simple variables - but the sample rate of the data is like 1.5seconds apart at best. If I choose more than about 4 parameters the frequency increases to like 2 seconds. If the sample rate was faster then it would...

@Fry1988 - sorry to hear you’ve the same issue - it is really odd that it’s the same build year! I’ve done the full egr clean down too and same result- zero. I’ve not been able to resolve mine as yet and it is literally frustrating the hell out of me. @Shayne - I’ve considered the transmission...

@Bob Thanks for the response. I’ve done the SCV (brand new) and whilst slightly more responsive, didn’t solve the issue. I went straight for the TPS after that, which I think is integrated within the throttle body. I swapped a whole throttle body in from another vehicle - again no change at all...

G’day team, long post, but really need some help, as this problem is killing me!!! And also my wallet. Car is: - 1kd 2007 - 213km - auto Fault: - whether hot or cold, there is a fairly significant amount of hesitation/ surging occurring at 2100rpm, 2300rpm and 2400rpm. The car physically...

Old post I know. Was keen to see if the original poster was still around and whether there was any resolution on this issue. I’m running a 1KD with a similar issue that I’ve spent heaps of time and money on trying to resolve…..alas, no success as yet.