allegroequipe

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About allegroequipe

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  • Toyota Model
    Previa d4d T2
  1. After 6 months of problems I've finally sorted the poor performance and lack of power over 3000 revs. After the initial p1251 was fixed with some halfords 10k boost it came back and was fixed with BG224 Fuel additive but she still lacked power and the question remained, why so much soft soot in the system? SCV tested, fuel pressure tested, VSV ok. EGR cleaned and then replaced no improvement. Still running rich causing excess soot in the system and a coked up EGR. Fuel filter replaced and new air filter fitted, no difference. No fault codes at this point either. Water temp sensor replaced in case the ECU was getting a message that the engine was always cold and therefore needed more fuel - hence the excess soot, no difference. Air intake sensor removed cleaned and tested, all ok and no difference. Removed the air filter to confirm running rich by allowing more air in and she runs fine! The end of the air filter intake that clips to the valence near the radiator was missing it's 2 clips, it was missing one when we got the car. Above 3000 rpm the plastic intake was lifting a little and as it is chamfered it was moving closer to the bonnet and gradually reducing air flow. With new clips in place she goes as she should and mpg is back above 50mpg. Found the old clips in the filter box! The restricted air flow was probably the cause of running rich which was probably the cause of the EGR and Turbo coking up. Feel stupid for not sussing this sooner but thought I'd share in case it saves someone the same hassle I've had!
  2. Seems like ours had two problems, unrelated but giving similar symptoms. The sticky turbo as sorted with halfords 10k boost and I've decoked the rest of the system (I think) with some BG244 for diesels. I've also switched to a 50/50 mix of diesel with my home made biodiesel to reduce carbon in the system (she goes well on it!). The issue of no grunt over 3000 rpm seems to have been a daft one. Cleaning the EGR helped but it wasn't the problem, nor was the turbo. I bought a filter kit from ebay (air filter, fuel filter and oil filter). With the radio off, you can hear what sounds like a plastic flap closing at 2000rpm. It is in fact the air filter moving in the box because it's not allowing enough air past. It appears clean, however it's simply not deep enough so it moves and although it isn't blocked, it doesn't flow enough. With no air filter she goes like a rocket. Back to basics, check compression, spark (not in a diesel obviously) and fuel supply (air and diesel). I'll buy a proper one next time.
  3. Finally seemed to have fixed this problem. I tested the Air mass meter, VSV sensor (Toyota workshop manual actually shows air flow through it back to front which really threw me - nearly replaced it!) and SCV's all ok. Just removed and decoked the EGR. Wasn't much in it to be honest. Soaked it in brake cleaner for 10 mins, then blasted out with pressure washer. Plunger moves up and down easily now. Re-installed and she's fixed. Flies upto to 5000 revs again in all gears (we'll, not tried 5th at that speed!). Pleased with a nice easy (less than 60mins) fix! Looks like, halfords 10k boost and an EGR clean every now and then will be an easy and cheap fix in comparison to a new turbo.
  4. Hello chaps. I used the fuel treatment thinking it would be a cheaper version of halfords 10k boost. It worked for about 50 miles then power dropped after 3000 revs again. I tested the Air mass meter, VSV sensor (Toyota workshop manual actually shows air flow through it back to front which really threw me - nearly replaced it!) and SCV's all ok. Just removed and decoked the EGR. Wasn't much in it to be honest. Soaked it in brake cleaner for 10 mins, then blasted out with pressure washer. Plunger moves up and down easily now. Re-installed and she's fixed. Flies upto to 5000 revs again in all gears (we'll, not tried 5th at that speed!). Reckon the fuel treatment and/or 10k boost released the valve temporarily by softening the carbon but not enough to stay fixed. Pleased with a nice easy (less than 60mins) fix!
  5. well, it wasn't the turbo this time after all. I downloaded the workshop manual from 'ibid' for $5 and then tested the likely culprits. SCV's tested ok with an ohmmeter as did the PSV sensor. The air flow meter had no resistivity though indicating it was dead. Hopefully the one from ebay for £20 will cure the problem!
  6. seems like a lot of people have this problem with the car going into limp mode, normally while overtaking, going up hill. The D4D- turbo is variable vane (trying to maximise google search to help others so excuse teaching to suck eggs!). The turbo gets coked up and the vanes stop moving so we need to get them moving again (or pay £2500 for a new turbo). Coke is hard but can be softened to allow the blades to move. A previous post said halfords 10k boost worked, which it did on my car for the first 10K miles (what it sad on the tin) but then the turbo stuck again after 4k and £20 seemed a lot to pay every 4 months so... so I poured Wynnes diesel treatment straight in the turbo intake (like we used to do with redex into the carb!). I set the revs to 3000 first and after pouring the treatment into the turbo for 3 secs the revs rose to 4500 for 5 secs before reducing back to 3000. With a 3 sec pour and 20 sec wait it took about 10 mins to get the whole bottle in. I then drove 2 miles, left the car 1 hour and then moved the stepper unit pintle up an down about 10 times with my finger. This is hard to do on a Previa as it as at arms length. If you put a piece of card over your finger tip it doesn't hurt as much. If you remove the fuse box you can get both hands to the pintle to wiggle it and move the blades to free up the carbon. After 3 months of the car not going over 3000 revs it now revs to 5000 quite happily and all for £7!!! I'll post next time I get p1251 but not before. I normally drive 12k a year so if no posts before 12 months it has worked for 12k!!
  7. Had the same problem in Previa at 70,000 miles. Toyota wanted £2500 to 'fix'. I used two bottles of fuel treatment and a can of halfords 10k boost. Problem went away for 9800 miles. Came back a few weeks ago, so I did the same but it's come back after 500 miles this time. I'm lead to believe it's the blades sooting up in the turbo. We're on the verge of selling the car because of this unless a looming switch to biodiesel (made in my garage) will help by giving less soot. Surprised there isn't a fix of an inlet on the turbo for oven cleaner! (unless it's a different fault in the electrics as you wonder!). Would love to know as we like the car and have 4 kids so really don't want to sell.