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Join Date: Aug 2008
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Starting Problem

1989 2.7L 944 n/a

I have gas to the fuel rail (pressure is good, gas is clean, fuel pump just installed, but works and has good pressure) , I also have the spark at the plugs, but the car just cranks and cranks and wont turn over.

battery is brand new
starter just rebuilt

the sparkplugs are NOT getting wet though


also we pumped out the old gas in the line before putting the line back on the injectors so the gas is not an issue. its got 15Liters of 94 octane in the tank , the best available locally


Yes it has sat for 2-3 years, but it started in spring 2007 , and were guessing (me and pops) that its the fuel injectors that are at fault here.


Any other ideas\/possibilities?


any self-rebuild injector kits or is it better to send em off to someplace to be rebuilt? also I was instructed that if I take apart my fuel rail I wont be able to put it back together with the old parts since theyre all going to fall apart as the fuel rail is removed, basically requiring an injector rebuild.


Im in montreal, quebec, canada
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1989 944 2.7L n/a
Old 10-20-2008, 11:58 AM
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Get a noid light to verify if the injectors are firing. If the plugs are not getting wet, that is most likely your issue. If you get a pulse with the noid light, the injectors are bad. If you dont, there is either a wiring issue to the DME or a sensor issue.

Its possible the injectors are gummed up enough from sitting that the pins inside are frozen and not flowing fuel. Try tapping on the injectors to free them up, otherwise you can take them off the car, clean them out with injector cleaner and cycle them with a 12v source (IE car battery).

You can also give the speed and reference sensor connectors at the back of the intake manifold a wiggle.. but i doubt that is your problem because you are getting spark.
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Jon
1988 Granite Green 911 3.4L
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Past worth mentioning - 1987 924S, 1987 944, 1988 944T with 5.7L LS1
Old 10-20-2008, 12:11 PM
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yeah im about to take out my fuel rail and soak the injectors overnight in some brake cleaner

is it 100% necessary to cycle them after cleaning or can i just put them back in and fire her up?
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1989 944 2.7L n/a
Old 10-20-2008, 12:33 PM
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Not necessary to cycle them but i figure it will increase your chances of freeing them up (if they are indeed stuck). Usually what i do is stick a rubber hose over the inlet of the fuel injector and fill it with whatever your cleaning with. Then ill cycle the injector a few times to get the cleaner to run through the injector.
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Jon
1988 Granite Green 911 3.4L
2005 Arctic Silver 996 GT3
Past worth mentioning - 1987 924S, 1987 944, 1988 944T with 5.7L LS1
Old 10-20-2008, 12:37 PM
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ah I see, thanks for the help.
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1989 944 2.7L n/a
Old 10-20-2008, 12:40 PM
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1984 porsche 944 na
 
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Try tapping like a pool cue first like Techno said.. Has worked for many clogged injectors
Old 10-20-2008, 01:05 PM
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how hard am i supposed to pry on the injectors, because theyre pretty stuck, unless im just not prying hard enough.

also which end of the injector am i tapping with my screwdriver, the bottom end, or in the thicker middle?


thanks
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1989 944 2.7L n/a
Old 10-20-2008, 02:05 PM
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Learned by do'n twice
 
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Before pulling apart, simply tap each injector firmly but gently with a BIG screwdriver near where the injector plugs into the intake manifold. If it doesn't work, try again while someone is cranking the car..

jmd_forest
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Old 10-20-2008, 04:23 PM
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It does sound as if you have some bad fuel injectors. Replace them and my guess is that will resolve this issue.

Like those above have stated, if the fuel rail is pressurized, you have good spark, the battery is charged above 12.5 volts, and the car turns over with starter fluid.
Then, the only thing left is the fuel injectors. As far as prying these fuel injectors, if it is very difficult to remove chances are these injectors have seen their life expectancy.

My .02cents.

Good luck with that.
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Ed Paquette
1983 911SC
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Old 10-20-2008, 05:32 PM
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