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Author Topic: 2.2 dti p1220 nightmare  (Read 675 times)

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Ghoul

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2.2 dti p1220 nightmare
« on: 16 December 2017, 21:01:52 »

I'm stuck and desperately in need of help with this car

I had a dti that racked up 270K before the chain slipped and locked the engine

I bought another omega estate spares and repair with a faulty fuel pump

Thus far I have tried two new EDC's on the old fuel pump, it ran for a few days then I started getting p1220

I've cleaned the tank strainer, changed the fuel filter, leak off pipes changed the fuel pump for a known working one off another omega, this was from a garage

I got it started and now it's giving me p1220 AGAIN AAAAAAAAAAARRRRRRRRRRRRGGGGGGGGGGGH I'm at my wits end with this, it starts up abeit a bit sluggish but as soon as you rev it it judders and then I can't rev it any higher than 1500rpm OP com tells me the injection angle is out of sync less than what's desired I'm in doubt its the fuel pump I spent the best part of 6-7 hours doing it outside in the cold, please can anyone tell me how they've sorted this out?

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VXL V6

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Re: 2.2 dti p1220 nightmare
« Reply #1 on: 17 December 2017, 10:48:27 »

Still sounds like EDC to me.
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terry paget

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Re: 2.2 dti p1220 nightmare
« Reply #2 on: 17 December 2017, 11:21:34 »

EDC?
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TheBoy

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Re: 2.2 dti p1220 nightmare
« Reply #3 on: 17 December 2017, 16:02:20 »

EDC?
Electronic Diesel Control Unit.  ECU in other words.  Sits on top of the Bosch VP44 used in the 2.2DTi. In the case of the Bosch VP44 injection pumps, the EDC is known to be unreliable (esp when running the pump dry and cranking the engine with no diesel in the pump, hence the awkward, complex bleeding procedure on these). This impacts all implementations using the VP44, not just Vauxhall.
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Ghoul

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Re: 2.2 dti p1220 nightmare
« Reply #4 on: 18 December 2017, 23:50:41 »

Thanks for the replies, I don't think it can be the EDC I've changed it three times I doubt I'd have three faulty EDC's

I've seen a few of these threads but I can't find a definitive answer to what causes this, anyone please?
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Doctor Gollum

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Re: 2.2 dti p1220 nightmare
« Reply #5 on: 19 December 2017, 00:49:42 »

Thanks for the replies, I don't think it can be the EDC I've changed it three times I doubt I'd have three faulty EDC's

I've seen a few of these threads but I can't find a definitive answer to what causes this, anyone please?
You reckon?

Dti Vauxhalls only get scrapped for two reasons... MoT failure or Fuel pump failure...  ::)
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ajsphead

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Re: 2.2 dti p1220 nightmare
« Reply #6 on: 19 December 2017, 07:36:10 »

Suggestion. Try talking to a diesel injection specialist. You have these guys https://www.welhamgroup.co.uk in Leicester, and possibly others too. I only know a little about the VP44 system, but understand that your problem may not necessarily be to do with the EDC but could be to do with a sticking valve on the mechanical side.

VP44s were fitted in millions so they are pretty common units but sadly subject to a great deal of arm chair logic. If anything went wrong with mine, I would probably admit defeat and give it to an expert to sort out as they are inherently complex - bit like taking an auto gearbox to bits and re-building it.

This might also help:

How Does the VP44 Fuel Pump Work?

The VP44 fuel pump is an electronic rotary pump that delivers fuel at extremely high pressures, and additionally controls the fuel flow rate and timing for the engine. The added responsibility of controlling the flow rate and timing means additional electronics, and also means that the VP44 has, in addition to physical part failure due to the constant high pressure and wear inside the housing, the opportunity for electrical failure through the on-board PSG, or ECU. These two failures account for the vast majority of VP44 fuel pump failures.

Internal Housing Wear Failure.
As stated earlier, the VP44 not only provides pressure, it controls engine timing and fuel delivery. As the timing is constantly changing, the internal component that moves to create this timing movement, the timer piston, is under constant motion, and under constant pressure. With time, the friction of this movement creates wear and grooves in the pump housing. Since the timer piston works under a pressure principle, it needs to maintain pressure on one side to cause movement. Once wear and grooves are created in the pump housing, fuel leaks from either side, balancing pressure, and the piston ceases movement. Once this starts to happen, the pump loses timing advance, the engine loses power, and you consume more and more fuel. The repair for this condition is replacement of the pump housing and internal parts.

PSG, or ECU Failure.
Each VP44 fuel pump has a separate computer connected to two internal sensors. The main cause of failure is with the wires connecting the two internal sensors to the PSG. The pump itself creates considerable heat, and after enough heat cycles, the wires and connectors become brittle, split, crack and fail. Additionally, there can be failures of the PSG and sensors themselves, though this is less common. The solution here is to replace the entire PSG.
« Last Edit: 19 December 2017, 07:52:00 by ajsphead »
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Ghoul

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Re: 2.2 dti p1220 nightmare
« Reply #7 on: 20 December 2017, 01:19:07 »

I'm glad to report I have sorted the problem, 3 edcs and a fuel pump later... All it was that the sleeving for the angle sensor had come apart causing the wires to touch producing that area, the sleeving crumbled in my hands a's I touched it. I'm driving it, lovely air suspension stage remap and egr deleted, awesome car to drive, cheers for the help
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VXL V6

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Re: 2.2 dti p1220 nightmare
« Reply #8 on: 20 December 2017, 07:36:46 »

Excellent! We'll done for persevering with it.  :y
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TheBoy

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Re: 2.2 dti p1220 nightmare
« Reply #9 on: 20 December 2017, 17:10:20 »

Internal Housing Wear Failure.
Bosch also warn that running the pump dry (ie not bleeding it after fuel interruption) quickly does causes excessive wear.
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raywilb

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Re: 2.2 dti p1220 nightmare
« Reply #10 on: 20 December 2017, 18:14:43 »

glad your sorted. also agree with you regards a remap & egr delete. mine is regularly doing round trips of 600mls no bother. :y
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horsecow

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Re: 2.2 dti p1220 nightmare
« Reply #11 on: 10 January 2018, 10:11:43 »

Re the remap and egr delete, is it worthwhile? Considering this myself.
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