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Porsche Junky
 
mede8er's Avatar
 
Join Date: Nov 2004
Location: Salida, CO
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Bypassing Boost sensor....

I have a bad sensor and shunted the line to ground...it starts up great but runs rough/dies at speed.....is this normal?????
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1986 930 RUF equipped
Old 02-16-2008, 10:08 AM
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Err...which "boost sensor"??

There is only a transducer for dash gauge which does nill for the engine. There is also a overboost switch which cuts fuel pumps if boost goes over 1.1 bar.


What did you "shunt"?
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Old 02-16-2008, 12:00 PM
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Porsche Junky
 
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Sorry....overboost switch....switch is bad, had to ground the line to start the car.....
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Old 02-16-2008, 12:51 PM
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Well I guess we have reason to believe the grounding wasn't groundish enough? Time to check fuel pump relay and your earth paths? Worst case, hotwire the pumps?
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Old 02-16-2008, 05:30 PM
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Gotta Jibboo
 
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I don't think it should affect how it idles, etc. I had mine grounded out for a very long time.

Bill
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1986 911 Cabriolet (sold)

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Old 02-16-2008, 06:38 PM
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Check if you get 12v at both pumps. Check that both pumps are actually turning (and making noise). Check for air leaks.
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Old 02-16-2008, 11:53 PM
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Porsche Junky
 
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Yes, by bridging 30 and 87 on each relay both pumps run....it's possible I had a bad sensor switch and a bad relay, I'll check...
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Old 02-17-2008, 05:41 AM
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West Palm Beach and overboost switches just don't get along I guess...

I live there too and if i get on it with the wire on the overboost switch it'll shut off the fuel pumps at around 9bar everytime and leave the car and me on the side of the road...
That switch on mine must be used up because it won't let the car start until I remove the wire from it and ground it.
So, I have a little male spade terminal mounted on the intercooler next to the switch now and the overboost wire stays on it now. . . works great.

If that stupid switch wasn't so ridiculously overpriced at around $75 I'd buy a new one, but it should be no more than an oil pressure switch at around $10... so forget that.

I have the VDO mechanical boost gauge with telltale in the clock hole and it shows peak boost at just over 9 bar with a K27HFS turbo and B&B headers on a 75 degree day so I just leave the wire grounded and enjoy the car.
Old 02-17-2008, 09:04 AM
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Porsche Junky
 
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Yo Fairman...where you at? I'm in the Acerage......
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Old 02-17-2008, 10:33 AM
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Lucky you to live out there...

I'm around southern and olive, not far from the corner store... a good source for any kind of beer.
And they have a generator to make ICE... after hurricanes.
Old 02-17-2008, 10:44 AM
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I have an adjustable pressure switch ready to fit in my 930.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg
Old 02-17-2008, 11:54 AM
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