Feels like bump start when ice kicks in

Hi all
Gen 3 prius 2010 started with car conking out on dual carriage way no pre warnings or problems apart from clatter/rattle at 30mph or so every now and then. So check hybrid system with all yellow warnings on dash.Had Torque lite app on mobile which at the showed as throttle motor fault. Changed the throttle body been fine for a while now.

Now check hybrid system light again this time Torque lite wont show codes but will clear them and the cars fine.
So I invested in Tech Stream and a vci cable. I found Tech Stream extremely slow and basic to be honest.
With Techstream I managed to pull code p080a after waiting 2 weeks for light yo come on. Now after clearing code all is well again except although running ok has started this clatter/rattle again which was solved by me cleaning the intake manifold/egr and pipe before but it has now returned. Alongside with this the strangest thing of all intermittently when pulling away or at low speeds when the engine should kick in the car bucks and dips at the front and then starts almost like being push started.
So it resists starting itself but feels it starts due to motion.

Any ideas. It has 225k and no ither faults

 

I feel I should add as well that I have noticed for example when im just sitting in Park the display will show sometimes engine charging thr battery or inverter and sometimes nothings doing anything. So where the engine should have switched of it just stays on doing nothing. Also when engine should switch off it sort of stalls and starts again the tried again and keeps not switching off

 

Hi
Thanks for your reply.
I have cleaned them 3 months ago. I cleaned the intake again 3 eeeks ago when doing throttle body. Cleaned all sensors as well

 

Ok so took egr cooler and pipe off again yesterday. Cleaned the whole lot out.there has been an improvement and a whole lot quiter for sure but let me do a few more miles. I have noticed smell of fumes with heating on as i was trying to bleed coolant system and can still smell it now but only when standstill.

Also does anyone know what the official bleed procedure is with a bleed valve. I just normally ignore the valve and leave expansion tank cap off until its circulating

 

Ok so I tool off the whole intake and egr system out again yesterday as i missed the egr cooler gasket. Now this time i really cleaned everything out good and proper. Egr was a bit sticky but now all good.
But my intermittent problem of bump start feeling is still there.
Every now and then the charging cycle is playing up wherby display says engine and inverter isnt doing anything and battery not charging. While driving along evrrytime ice needs to kick in it feels like a bump start with a knackered battery where the car just bucks and then starts.

Getting really confused now

 

Hi yes I have the valve. Just wondering i normally do what nutzandboltz does and do it from radiator cap.

 

Hi
Changed spark plugs 10,000 miles ago with genuine upgraded plugs.

I didnt change gasket as i used a thin bead of silicone underneath the gasket.

Coolant changed about 20,000 miles ago.

Egr, egr pipe, intake manifold all cleaned again 2 days ago. On the egr pipework i use oven cleaner foam the egr cleaner spray. Cleaning thouroghly the insides was getting good movement from egr.

Intake manifold with intake cleaner followed by a high pressure jet wash making sure all 4 ports were clear when jet washibg from side port. Same with egr cooler.

Now I have read soo many post this morning so I diverted my attention to coils as someone mentioned when you take off cowl under wipers it breaks a seal that leaks onto coil but my coils were bone dry. Either will check over weekend.

Now then other theory was 12v battery And related to heating fan.
I always drive with at least 1 bar or fan speed 1 to keep windows clear and i do use the heating a lot. Now for the last hour or so i switched fans to off and it has improved slightly.
But yes it does do it when traction battery gets to 2 bars charges then display stops showing charging state or engine state and then roughs rough

 

Hi yes
It was using oil. I have changed to 5w30 now noy 0w20 anymore. Slight difference but not massive. I will be addibg an oil catch can soon.

No coolant loss at all

 

As long as you are not hearing a gush of fluid behind glovebox on startup you should be ok. But otherwise get front of car high up with expansion cap off heating to hi and fan speed 1 or 2. It takes at least 30 mins current UK temperatures (very unlikely to get fan to kick in but once it has circulated a couple of times your done

 

When i tried to bleed from valve i git a few drops out then several drops every couple of minutes then nothing so i closed it and done it from expansion tank

 

Ok guys
So went to bed with the relief that its either the 12v battery or 1 of the coils.
So armed with my voltmeter expecting to find a dead battery i see 12.55v at the battery terminals first thing in the morning.

So i open the coils to find them all equally with a spot of rust/factory grease maybe but only on surface half way down. Doesnt seem to be enough to cause upset..

So what am i missing