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Twins are more fun!
Join Date: Dec 2005
Posts: 639
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Motronics: Testing for leaky injectors?
I suspect I have a leaky fuel injector in Cyl # 1.
How do I test/verify whether the injector is in fact leaking? The plug is sooty and wet and I suspect it's wet from a leaky injector.
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James Carrera TT (3.3, Protomotive MAP ECU, EFI, GT2 EVO CAMs, Twin Plugged, Twin Turbo's) |
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01-28-2007, 06:29 PM
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Registered
Join Date: Dec 1999
Location: Novato, CA
Posts: 4,740
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The only way I know is to pull the injector rails out far enough to observe for leaks.
Other than that, I would replace the #1 ignition wire and spark plug and see if that takes care of it. Cheers, Joe |
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01-29-2007, 07:52 AM
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Registered
Join Date: Jun 2001
Location: Northern CA
Posts: 585
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I have the same concern and just this weekend pulled all six and sent them to WitchHunter Performance for flow testing/cleaning. I have been running a little rich and think it may be a leaky injector or two.
If nothing else, their service should give me a good baseline for my 200k+ mile injectors.
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Mark '88 Carrera GPW Sunroof Coupe '82 SC Targa (RIP) |
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01-29-2007, 08:32 AM
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Registered
Join Date: Dec 1999
Location: Novato, CA
Posts: 4,740
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Don't know where this leaky injector causing rich condition myth comes from but the usual condition is clogged injectors resulting in a lean condition.
Rich conditions are usually remedied by mixture adjustments on the AFM CO mixture screw etc. Chers, Joe |
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01-29-2007, 11:01 AM
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Registered
Join Date: Oct 2001
Location: las vegas nv
Posts: 99
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I've got an 85 that was running rich & finally sent all 6 to witch hunter for a cleaning, @ 175000 miles 3 were shot, the pintel tips were worn down & wouldn't seal. replaced all six & life is real good. just tap the key 1st thing in the morning fires right up.
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doug 85 911 cab - red ongoing work in progress |
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01-29-2007, 11:14 AM
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Registered
Join Date: Jun 2001
Location: Northern CA
Posts: 585
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Mythbusters R Us
Here's one quick excerpt now:
Leaky Injectors Wear in the injector orifice and/or accumulated deposits can sometimes prevent the pintle valve inside an injector from seating, allowing fuel to dribble out the nozzle. The extra fuel causes a rich fuel condition, which can foul spark plugs, increase emissions and cause a rough idle. A carbon-fouled spark plug in one cylinder of a multi-port EFI engine usually indicates a leaky injector. If cleaning fails to eliminate the leak (which it can if dirt or varnish are responsible), replacement will be necessary. Found here. YMMV.
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Mark '88 Carrera GPW Sunroof Coupe '82 SC Targa (RIP) |
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01-29-2007, 11:18 AM
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