Puff of black smoke on acceleration? - VAG 1.8 Turbo engine.
Discussion
Hi,
Recently bought a new track slag... Seat Ibiza Cupra 1.8 20v Turbo.
Car has done 70k miles, full service history and seems very well looked after mechanically. Massive invoice file.
According to the invoices it has been to Jabbasport a few years ago and fitted with few extras in the form of a K03S Turbo, new exhaust manifold and full stainless system, cold air intake pipe, filter and shield, a heap of Forge Motorsport parts including dump valve, piping, and all silicone hoses.
It's also had various sensors and other things uprated or blanked off etc, then had a remap which showed about 220bhp.
It felt fast when I bought it, but not 220bhp in a little s
tbox type fast.
Got my mechanic to check it all over and fit a boost gauge, he found a few little problems like split vacuum pipes here and there. Gave it a full service and fixed all the pipework.
Now it's producing 22psi boost at full chat and wheelspinning in 3rd gear which is great, but it's also now putting out a puff of black sooty fuel type smoke the instant you floor it.
The black reek only lasts for a split second and it then runs completely clean as it pulls to the redline. Also runs totally clean on the over run and at idle etc.
It didn't smoke at all prior to the fault finding.
Other than the smoke it seems to run perfect. It's not using any noticeable amount of oil and is one if the smoothest, quietest engines I've heard.
Any ideas?? I'm just a bit worried...
Recently bought a new track slag... Seat Ibiza Cupra 1.8 20v Turbo.
Car has done 70k miles, full service history and seems very well looked after mechanically. Massive invoice file.
According to the invoices it has been to Jabbasport a few years ago and fitted with few extras in the form of a K03S Turbo, new exhaust manifold and full stainless system, cold air intake pipe, filter and shield, a heap of Forge Motorsport parts including dump valve, piping, and all silicone hoses.
It's also had various sensors and other things uprated or blanked off etc, then had a remap which showed about 220bhp.
It felt fast when I bought it, but not 220bhp in a little s
tbox type fast.Got my mechanic to check it all over and fit a boost gauge, he found a few little problems like split vacuum pipes here and there. Gave it a full service and fixed all the pipework.
Now it's producing 22psi boost at full chat and wheelspinning in 3rd gear which is great, but it's also now putting out a puff of black sooty fuel type smoke the instant you floor it.
The black reek only lasts for a split second and it then runs completely clean as it pulls to the redline. Also runs totally clean on the over run and at idle etc.
It didn't smoke at all prior to the fault finding.
Other than the smoke it seems to run perfect. It's not using any noticeable amount of oil and is one if the smoothest, quietest engines I've heard.
Any ideas?? I'm just a bit worried...
Just to add, when I bought it you couldn't hear the dump valve operating much and I thought it was perhaps a recirculating one, but now all the vac pipes were replaced it seems to be working quite loudly.. I guess this should read now working properly?
Don't know if that makes a difference?
I'm not a fan of non-recirculating DV's but I guess it's there to do a job.
Don't know if that makes a difference?
I'm not a fan of non-recirculating DV's but I guess it's there to do a job.
Shouldn't be fitted with non recirc DV, Atmos DV's are notorious for causing such running problems. Some people fit valves into the vac pipes to allow the DV to close on idle and light throttle, but this is a botch IMO. You may find the DV is open on idle bypassing the MAF and causing the ecu to read false airflow signals.
I'm not saying this is your problem but if you have an atmos DV fitted its worth looking at anyway.
I'm not saying this is your problem but if you have an atmos DV fitted its worth looking at anyway.
Thanks for the help so far guys, appreciate it.
Yes the car was running clean with no puffs of smoke, but it was also clearly down on power and the dump valve wasn't 'dumping', which I'm guessing was down to a few split/perished vac pipes here and there that have been replaced.
Does that info help?
Yes the car was running clean with no puffs of smoke, but it was also clearly down on power and the dump valve wasn't 'dumping', which I'm guessing was down to a few split/perished vac pipes here and there that have been replaced.
Does that info help?
The vac pipes will also be controlling the DV, any splits will allow the DV to close and not operate effectively, now its working as it should it may well be the cause of all your problems.
Take the vac pipe off the top of the DV and temporarily blank it. take it for a quick spin to see if the problem goes, if so you need to replace it with a recirc.
Take the vac pipe off the top of the DV and temporarily blank it. take it for a quick spin to see if the problem goes, if so you need to replace it with a recirc.
Edited by Mikey G on Wednesday 13th November 11:43
Edited by Mikey G on Wednesday 13th November 11:43
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