Blue smoke is generally oil. Michael is suggesting excessive quantities of REDEX as a solution to stuck rings and this is a lot less hassle than stripping the engine and should not cause any issues provided it is not a regular exercise - not sure what REDEX does to the lubricity improvers in the oil that prevent excessive ring wear.
Agreed re oil from the turbo. Is ait actually giving the correct boost? Be warned that taking one apart requires a) the right tools, b) the correct spares and c) the know-how on setting up the end float, checking the thrust bearings and making sure that the shaft nut is orientated correctly as often manufacturers machine the nut as part of the balancing process - at >100k rev/min the balance has to be very fine or the bearings will run out in seconds! Getting enough oil to the turbo is very important as the oil also acts as the major part of the thrust bearings. Getting the oil away from the turbo is also a majorly important issue to avoid build up and carry over into the engine. If that happens it is likely to sound like a diesel as the oil will detonate late in the cycle under load and go straight through if there is not enough heat to ignite it. As a number of subscribers to this forum will agree, a second hand turbo is more often a recipe for disaster as someone probably got rid of it because it had a problem. Is this a wastegated turbo or VGT? If the wastegate actuator is not working correctly then you might have problems - check the pressure tube between the compressor and the actuator for splits or leaks If the smoke is white then you have a fuelling problem. This could be as simple as a stuck injector or possibly an ECU issue - I had a problem early on with my H4 were the ECU got "spiked" and permanently turned on one injector. The white smoke produced could have hidden a battleship. The cure was to reset the ECU by removing its power source and then following the setup procedure - I did write this up in an article in QM on the problems I had with my Beauford but lost the original in our house fire last year. The REDEX trick could possibly clean a gunged-up injector but not one with dirt in it. Black is excessive fuel which would suggest either an ECU problem or more likely that one of the sensors is not working or talking to the ECU - do you have a MAP sensor? Scoping the output should see a signal that changes frequency with pressure into the device. Not sure what happens as far as frequency is concerned with boost but I did list the frequencies expected for a non-boosted engine in the article referred above. Check any other pressure sensors that talk to the ECU and their respective pipework. Your response is awaited with interest. Hamish -----Original Message----- From: quantumowners@googlegroups.com [mailto:quantumowners@googlegroups.com] On Behalf Of Jim Hearne Sent: 10 June 2012 22:17 To: quantumowners@googlegroups.com Subject: Re: [Quantum Owners] Fiat 20vt quantum smoke issue... What colour is the smoke, blue, black or white ? My initial thought would be the turbo, especially if it's been changed recently. Or the oil drain from it being blocked. Jim On 10/06/2012 19:07, Susan and Martin Scott wrote: > As the plugs are clean should the valve stem seals be suspect? > Could it be getting through the turbo into the exhaust? Could it be > that it is actually smoking on boost but not as visible? > Just some thoughts... > > > ----- Original Message ----- From: "barnacle" > <nailed.barna...@gmail.com> > To: "Quantum Owners Group" <quantumowners@googlegroups.com> > Sent: Sunday, June 10, 2012 6:00 PM > Subject: [Quantum Owners] Fiat 20vt quantum smoke issue... > > > Scratching my head on this one... couple of weeks ago the 20vt 2+2 > passed its MOT after a lot of work rebuilding the brake and clutch > master cylinders, dropping in a new turbo, and rebuilding the inlet > ducting. > > Two hundred miles later it started smoking. Not a mild 'just a couple > a day' but a full sixty a day habit, the sort that makes passing > policemen raise an inquisitive eyebrow and makes people wait thirty > meters behind you at the lights. > > It smokes on idle. It smokes on overrun. It smokes on gentle running. > It *doesn't* smoke on boost except momentarily at the start of boost. > > Today I have (with the very welcome assistance of Joe, who's an expert > on these engines): > > - pulled the inlet plumbing from the turbo: clean > - pulled the exhaust plumbing from the turbo: clean > - checked the turbo shaft for bearing wear/movement: nothing > - checked the turbo actually turns: yup > - checked the lambda sensor: clean > - replaced the positive crankcase ventilation valve with a block (it > was leaking *slightly*) > - tested for pressure from the oil filler: none > - checked the oil for water and the water for oil: none > - checked all five sparkplugs: clean > - checked the compression (cold/dry) on all five cylinders: 150psi +/- > 5psi = well within spec > - cursed the engine quite comprehensively, including the sacrifice of > a chicken or two > > There is absolutely no evidence of oil being burnt in the engine apart > from the fact that it's a mobile smokescreen... > > The next thing is to drop a new head on it. All we can think of now is > the valve stem seals (cracked piston, rings, or valves seem excluded > by the pressure readings) and this is not a fault for which this > engine is renowned - I know of perhaps three cases in fifteen years. > > What have we forgotten? Any other thoughts? > > Ta, > > Neil > -- You received this message because you are subscribed to the Google Groups "Quantum Owners Group" group. To post to this group, send email to quantumowners@googlegroups.com To unsubscribe from this group, send email to quantumowners-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/quantumowners?hl=en IMPORTANT NOTE: All information presented herewith is provided on an "As Is" basis, without warranty or the implication thereof. Neither the Quantum Owners Club nor the individuals associated with the Quantum Owners Club or in the preparation of the above information shall have any liability to any person or entity with respect to liability, loss, or damage caused or alleged to be caused directly or indirectly by the instructions contained within this or related message(s). -- You received this message because you are subscribed to the Google Groups "Quantum Owners Group" group. To post to this group, send email to quantumowners@googlegroups.com To unsubscribe from this group, send email to quantumowners-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/quantumowners?hl=en IMPORTANT NOTE: All information presented herewith is provided on an "As Is" basis, without warranty or the implication thereof. Neither the Quantum Owners Club nor the individuals associated with the Quantum Owners Club or in the preparation of the above information shall have any liability to any person or entity with respect to liability, loss, or damage caused or alleged to be caused directly or indirectly by the instructions contained within this or related message(s).
