I get tick over smoke, from one exhaust, before I commit to buying new turbos from the US, and totally rule out the engine, (compression test results are ok) if I disconnect both pcv valves/tubes and so the block vents to atmosphere whilst the exhaust is smoking, if it was the engine thats worn in theory should the smoke from the exhaust stop??

 

Thanks

No. The pcv system scavenges blow by gasses putting your crank case into vacuum. If your car is smoking due to either blow by causing the turbos to back up and leak, shown as grey smoke at idle or the car is smoking on deceleration due to oil being drawn into the bore, shown by blue smoke. Removing the PCV could actually make your symptoms worse, that is assuming your PCVs are in good order to begin with. If you have a worn engine you will need more scavenging not less.

 

If you want to check it's not your engine causing the issue the best way to start is firstly reading the smoke, colour, when it happens etc then preform a compression test or better still a cylinder leakage test. If the block tests up all good then the first thing I'd do if you haven't already is actually refresh the stock PCV system. Make sure the brass restrictions in the front pipe are still there.

Well said Stephen, from recent experience... I would keep the pcv In place, especially if you suspect a worn engine.

 

Worn piston rings will increase blow by, therefore increasing the pressure in the crankcase that needs to be removed by the PCV system vacuum. With no vacuum on the crankcase, these gasses can build up to the point where the turbo oil feeds are no longer able to drain back to the sump.

 

Keep the vacuum in and do a compression and leak down test to prove the health, as previously said.

ohms test your injectors,14 is the correct reading,if its over the pintle doesnt lift correctly and the spray pattern is compromised causing smoking,more apparent at idle.

ohms test your injectors,14 is the correct reading,if its over the pintle doesnt lift correctly and the spray pattern is compromised causing smoking,more apparent at idle.

 

I assume that would cause a rich condition and provide dark grey/black smoke with a sotty appreance?

Yes bud sure does !!

I've actually has this happen. I swapped a failed one out when I switched blocks. The old block though it's quite obvious that, two of the pistons are no longer central. Thinking back I think at least one of the non central ones is the one that had that failing injector. I'm currently assuming preignition bent the rod though.

I get tick over smoke, from one exhaust, before I commit to buying new turbos from the US, and totally rule out the engine, (compression test results are ok) if I disconnect both pcv valves/tubes and so the block vents to atmosphere whilst the exhaust is smoking, if it was the engine thats worn in theory should the smoke from the exhaust stop??

 

Thanks

 

How bad is the smoke?

 

Before buying new turbos, have a look underneath the car. I've got a Zed in at the moment that was delivered to me for dyno work, despite having been smoking. White, acrid smoke. 10 seconds on the ramp was all it took to see the oil practically dripping out of the CHRA :sad: