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Registered
Join Date: Aug 2007
Location: Ojai, CA
Posts: 508
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930 runs bad under boost
i cant get to a mechanic for a few days, but i would like some opinions as to why my 930 runs perfect w/o boost. and then gradually starting a few days ago, when i get into boost, sometimes its ok but more and more its popping, generally making bad sounds, and a loss of power from what is used to be.
it has a stock wastegate. 3.2 intake efi mode td61 bb turbo b and b headers stock distributor does it sound like an ignition problem? or if 1 of the fuel pumps is bad would car run good w/o boost and bad under boost? its been a gradually worsening problem. it used to run like a bat out hell, now im afraid to boost it. any ideas? im supposed to go on targa california starting next thurs a.m. im hoping for a relatively easy fix, it does run very good w/o boost no smoke easy start up cold and hot no unusual engine noises. once again i ask the oracles on this site for advise, ideas, good news/bad news thank you, kevin |
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03-30-2011, 05:22 AM
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do you have a afr guage or wb02 datalogging on your efi?
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87 carmine red 930 | 57k | B6 modified IC | GHL headers | custom exhaust | VEMS EFI | carrera intake w/ flipped TB | LS2 coils | EBC | K27-7200 (soon to be replaced by GTX3071 |
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03-30-2011, 05:35 AM
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Join Date: Aug 2007
Location: Ojai, CA
Posts: 508
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afr
i have a afr guage but its the kind with the led lights. it runs very rich, so much so i think it need to be leaned a little. but not now.
no data logging. it a euro one ole buhl early efi system. i can plug in a laptop while im driving. |
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03-30-2011, 06:23 AM
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beancounter
Join Date: Jan 2008
Location: Weehawken, NJ
Posts: 3,593
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If the car has been running rich for a while, the spark plugs may be gunked up. I'd put in a fresh set of sparkies and see what I got.
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Jacob Current: 1983 911 GT4 Race Car / 1999 Spec Miata / 2000 MB SL500 / 1998 MB E300TD / 1998 BMW R1100RT / 2016 KTM Duke 690 Past: 2009 997 Turbo Cab / 1979 930 |
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03-30-2011, 07:15 AM
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Crotchety Old Bastard
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Boost leak? Eleminate vac leak, blown hoses, etc as a possibility before moving to EFI/Ignition troubleshooting.
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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 |
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03-30-2011, 07:21 AM
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Registered
Join Date: Aug 2007
Location: Ojai, CA
Posts: 508
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bad boost
thanks very much , men.
is it love hate with these 930s? like a girlfriend that screwed you over, but keep goin back. i couldnt sleep last night. i think if i could do it over, id stay with cis. i will let you know what we find. thanks again, kevin hopefully he will tell me to get some new headers..hehehe |
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03-30-2011, 09:15 AM
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Registered
Join Date: Feb 2008
Location: Marietta GA
Posts: 2,560
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Is your overboost sensor still in the loop? Mine started acting up and cutting fuel too early. If you still have it you can ground the wire and test it without the sensor.
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03-30-2011, 09:36 AM
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78 Porsche 911SC 3.0L, 3.3Turbo soon. 
