skoda superb running on three cylinders,injector reading stuck at 2.99

[lali]

skoda superb saloon 2 litre common rail, running on three cylinders and injector one reading is stuck at 2.99.  No fault codes and injector and wiring have been replaced.

[lichfielddriver]

what about a leak off test?

[lali]

what is a leak off test please

[FLAPPERJACK7]

What's the 2.99 is that the positive deviation value?

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[lali]

was told this by my mechanic so not sure, the injector is stuck at that number.  had my car a month now and still not sorted

[FLAPPERJACK7]

Ok sound's like a high positive deviation reading on injector one. 2.99 is very high. So its likely that the control plunger inside the piezo injector is not closing fully. Reading should be around zero. So . ....sounds like injector no1 is faulty. He could confirm this by swapping no1 over to no2 and taking the readings . If a new injector is required it will need to be coded afterwards.

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[lali]

they put in coded injector in no 1 and still same

[lali]

sorry they put in a brand new injector and coded it and still getting same problem

[lali]

they sent off the ECU to have that checked and nothing wrong with it.  Put in new wires. New injector coded. still not working properly

[lichfielddriver]

Dont know about the Skoda/VAG range but on Fords the coding has caused considerable confusion, the order of firing and the number of the cylinder getting confused on the readout on certain diagnostics and certain engines accepting codes then not storing them.

 

as Arnie said "5hit happens"

[FLAPPERJACK7]

Wow. What a jigsaw. Has a compression test been done. Iirc there about 30 bar and a limit of 20 bar .

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[BJM]

Try talking to

 

Cheltenham Diesel Auto Electrical Services

Townsend Street   (just past the Horse and Jockey on the right hand side)

 

Tel 515342

 

(No connection with them, but 90% certain your garage will be dealing with them locally, and you might as well try going direct to the experts)

[peterposh]

If the garage has had it for a month they clearly don't know what they are doing, take it somewhere else

[FLAPPERJACK7]

If its not the injector and not the wiring. ..surely it can only be the engine control unit or the software? .

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[lali]

hauled my car up SWABS yesterday. Got a £500 bill from my mechanic for NOT fixing my car too. 

[lali]

will keep all that have replied to this updated.  You are right Jigsaw, this is a puzzle

[lali]

SWADS I mean

[peterposh]

it's like buying a dog and barking yourself

[lali]

update for the problem with my car so far.  Two problems, the misfire was a bent conrod.  the rattle at idle I have been told is the flywheel.  getting this done tomorrow so will update if all is cured.  Shane at SWADS found out the engine problem in one day.  Engine sweet as a nut again now to sort out that rattle

[lali]

pic of bent conrod

[psycholist]

How the heck did that happen? People who seriously modify their engines (In a more than doubling the power output kind of way) are the only ones I've heard of running in to this. Was it on the cylinder with the injector issue?

[lali]

it was water damage

[lali]

not sure of all the technicalities, but that was what caused it

[lali]

yes on the cylinder with the injector issue

[psycholist]

The only way I can think of for water damage to do this is if enough water gets taken into the engine instead of air to fill the cylinder and stall out the engine thanks to water being effectively incompressible compared to air. Usually if this happens the whole engine is probably dead and you'll definitely notice it when it happens as you'll probably be in a couple of feet of water.