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930 turbo started sputtering and spewing out black smoke after warm

Hello friends,
I have a euro 1985 930 euro.
It's been driving without problems for years since my fabspeed intercooler and turbo rebuild. But today, after about 20 minutes of driving, I noticed the turbo started to sputter a bit and losing power around 4000 rpm. It wasn't so bad that it cuts out, but non the less a bit troubling. It was hesitating a bit and was spewing out some black smoke. At non-boost the engine seems to be running ok.
I also noticed that the idling is a bit higher than usual around 1100 rpm where it used to be around 800.
I wanted to take it to my mechanic but he's super busy for new few weeks so won't be able to look at it.
Any ideas what I should check? Does it sound serious? I am hoping that maybe some vacuum leak where the air fuel is too rich... but then I am not a mechanic.

Any suggestions would be welcome!

Thanks in advance.
Old 05-19-2017, 06:44 PM
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Most likely an air leak prior to the intercooler. Check all hoses and IC seals. Black smoke says so....you're losing air which results in a rich condition.
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Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, stock everything else. The result of a massive Pelicanite good will fire recovery effort. Truely an open book, ready for the slippery slopes to modification.
Old 05-19-2017, 06:59 PM
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Crotchety Old Bastard
 
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Vac leak also causes an high idle ...
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 05-19-2017, 07:09 PM
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i experienced the same symptoms when my warm up regulator failed. Car went from running fine to running black smoke rich. Warm pressures dropped like a rock and had to limp home. Fuel gauges are in order to verify before you spend any money on replacing the WUR.
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Old 05-19-2017, 07:23 PM
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Quote:
Originally Posted by mark houghton View Post
Most likely an air leak prior to the intercooler. Check all hoses and IC seals. Black smoke says so....you're losing air which results in a rich condition.
thank you mark, i was actually suspecting same. unfortunately with my limited knowledge i don't know which one to check... they all looked ok and tight to me.
Old 05-19-2017, 08:48 PM
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Quote:
Originally Posted by RarlyL8 View Post
Vac leak also causes an high idle ...
thanks Rarly, now i need to figure out which one of the vac lines are causing this... and what to look for
Old 05-19-2017, 08:49 PM
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Quote:
Originally Posted by stevie 77 930 View Post
i experienced the same symptoms when my warm up regulator failed. Car went from running fine to running black smoke rich. Warm pressures dropped like a rock and had to limp home. Fuel gauges are in order to verify before you spend any money on replacing the WUR.
thanks. not sure if that's the same problem as mine as idling is just slightly higher and i only get black smoke under boost...
Old 05-19-2017, 08:51 PM
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Take the intercooler off and check out your o rings. When carefully putting it back on some silicone grease is nice on the o rings to lubricate them.
I've used a little motor oil on them when nothing else was around and it worked fine.
Old 05-19-2017, 09:07 PM
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Seems to be an intercooler issue.
Old 05-20-2017, 12:45 AM
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Quote:
Originally Posted by jakebarrell View Post
Seems to be an intercooler issue.
are you suggesting the intercooler itself or the hoses and lines leading up to it? it's a fabspeed intercooler which is only 4 years old, hoping it wouldn't break that easily...
Old 05-20-2017, 08:44 AM
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More typical for the intercooler charge pipe plumbing to be the culprit of these symptoms. Many things can exhibit this way but are a little less common. I would start by checking the IC charge pipe then throttle body O-rings then related vac hoses then injection blocks. If all these are good move to the BOV, which can also present the same symptoms if not functioning properly. Those are the most obvious, if all check out move to the fuel system then ignition.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 05-20-2017, 09:06 AM
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Step one, install an afr meter... Without it, it triples your diagnostic work and guessing.

Recommend the PLX, doesn't require another o2 sensor, piggy backs off 1 sensor.

Best $200 you can spend. Has a voltage meter too...

Install this before you start checking WUR pressures...
Old 05-20-2017, 11:18 AM
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Quote:
Originally Posted by RarlyL8 View Post
More typical for the intercooler charge pipe plumbing to be the culprit of these symptoms. Many things can exhibit this way but are a little less common. I would start by checking the IC charge pipe then throttle body O-rings then related vac hoses then injection blocks. If all these are good move to the BOV, which can also present the same symptoms if not functioning properly. Those are the most obvious, if all check out move to the fuel system then ignition.
Brian has provided a good logical approach. It's not uncommon for an IC o'ring to become displaced, typically after boosting. One day things are fine, the next day things aren't.
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Old 05-21-2017, 08:06 AM
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Hi Mate

Are both fuel pumps running? check relays and sound from both pumps

Problem now is the new relays are rubbish and made in China so keep some spares in the car,
If only one pump running the engine would be masifly rich on the fuel mixture and may need a good run to clear, try this

regards
kev
Old 05-22-2017, 08:22 AM
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Hi solarispete

Did you sort the problem, do share

kev
Old 06-01-2017, 09:12 PM
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Well did he sort the problem?

It would be nice to know the outcome from these things so we could all learn!

kev
Old 06-23-2017, 08:06 AM
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