Do Fuel Injectors in the 928 fail like 1988-1992 GM?
05-17-2015, 12:38 PM
#1
Burning Brakes
Thread Starter
Do Fuel Injectors in the 928 fail like 1988-1992 GM?
Thinking about the Rochester injectors on GM Tuned Port Injection cars and the Corvette ZR-1, the injectors have a big failure rte due to ethanol in today's fuel.
Do Porsche 928 models have this same issue? I haven't see this discussed, and waned to ask. Thanks!
Do Porsche 928 models have this same issue? I haven't see this discussed, and waned to ask. Thanks!
05-17-2015, 01:24 PM
#3
I sent my stock injectors off an 82 to Witch Hunters for flow matching and refurb.
Although the cleaning helped the flow rate, it wasn't a spectacular improvement over 32 year old injectors that sat unused for 13 years.
But they work as good as new at a fraction of the cost of new parts.
Although the cleaning helped the flow rate, it wasn't a spectacular improvement over 32 year old injectors that sat unused for 13 years.
But they work as good as new at a fraction of the cost of new parts.
05-17-2015, 04:13 PM
#4
Burning Brakes
Thread Starter
The Multec Injectors fail. I had one set go at 5k mi, other at 50 k mi. Both in the past 2 years, both same year car. 
05-17-2015, 08:37 PM
#5
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I've sent off a hundred or more injectors for cleaning and refurb. I've had exactly two bad injectors that needed to be replaced.
This is for the LH injectors. Not CIS.
This is for the LH injectors. Not CIS.
05-17-2015, 08:43 PM
#6
CIS ones are usually just gummed up and pretty easy to clean up.
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05-18-2015, 09:56 PM
#9
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But then you can replace them for the more modern Bosch 4 hole injectors for about $365 for a set of 8 and forget about them for another 25 years.
__________________
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
05-19-2015, 11:44 AM
#10
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In my limited experience, the only failure I've seen was leaking where the plastic is joined to the metal, not good as this sprays raw fuel all over the place.
With that said they are basically a solenoid(like a relay w/o points), so yes the windings can fail (open/short) and they can also stick (open or closed).
Some basic at home testing can be done before sending them off to WitchHunter(or your favorite local) which also describes testing and storage on their website.
With that said they are basically a solenoid(like a relay w/o points), so yes the windings can fail (open/short) and they can also stick (open or closed).
Some basic at home testing can be done before sending them off to WitchHunter(or your favorite local) which also describes testing and storage on their website.
