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Non starter..any ideas please?

C

clemmo

New member
My Porsche 944 1989 2.7 wont start.
Its stood for a year. Ran fine when I garaged it.
It cranks over fine..Ive checked the plugs and cleaned them..all good and they spark.

It started a little..misfired then nothing since.
I noticed the fuel pump was quiet and suspected the DME relay. I looped it out and now I hear the fuel pump..but still no start!
Pulled out the plugs and they are dry..so no fuel.
The tank has a couple of gallons in..the warning light is on.

Any pointers please?
All ideas gladlly tried
Thanks
Clemmo
 
Is the fuel good if it's been standing for a while? Is it possible something has blocked the lines somewhere? I'm sure I read about a Honda or Toyota that had to have a redesign because spiders were laying their eggs in some of the pipework. I guess the plugs aren't wet?

(just some ideas, I am by no means a qualified mechanic so I'll defer to the greater minds on here who I am sure will be along shortly! Best of luck!)
 
Hi Clemmo,

If the warning light is on, how do you know there is a couple of gallons in?

I would chuck a few gallons of fresh fuel in and try it again. The old fuel may not be fresh enough, there may be some sediment which the extra fuel may shift, or there may be insufficient fuel in the tank at present....

Edit - this thing needs a spell checker [:D]
 
I suspect that your injectors are sticky with fuel additive residue. They dry like sticky laquer over time.

If you cannot hear your injectors tappeting away on cranking then thats likely to be the problem.

Make sure you have at least 3-4 gallons in the tank because a near empty tank can give the fuel pump problems building pressure from zero due to insufficient head of pressure.

If you suspect the injectors there are two approaches.
1 you can remove them get them cleaned tested and pattern set or.....

2. cheap n dirty Get a 9vPP3 battery and attach 2x wires .

Remove the injector electrical connectors.

Attach the negative battery wire to one injector spade and flash the positive wire quickly over the other injector terminal 20 times each injector.You should hear the solenoid in the injector clicking back and forth as it would in normal operation. This movement will clean the injector and should allow the engine to start and run .

It may run rough for a bit but will clear after a longish run

NOTE Do not hold both the battery wires on the injector for long periods or you risk damaging the injector solenoids it needs to be just a quick passing contact with one wire whilst holding the other wire on continuously.

You may still need some Easystart in the inlet

ps you won't hear the fuel pump because it only runs whilst the engine is actually running. When you turn the ignition key the fuel pump runs for only 1/2 second to build enough fuel pressure to start then the pump turns off until the engine is either cranking or running at more than 225 rpm
 
+1 for getting fresh fuel in there - my Skoda often has long periods of disuse, and the fuel will usually be awful at the end of it, meaning the car will run like poo, so I'll now get as much out as possible and then put fresh in before resurrection.
 
Cheers guys...Thanks for the info.
I guess first and easiest step is to get a couple of gallons of fuel..although the needle shows just over the red. At least I can be sure of enough "head" of fuel.

As mentioned I linked out the DME relay so the fuel pump runs all the time..just in case this was the issue. I didnt remember that it only runs briefly on key turn.

I apprecaite the fuel in the tank might not be too good but would expect it to run or at least try to.....Right now there is nothing!
As I said the plugs are dry...and they do spark.

Another point to remember is that the car did start initially ..very lumpy and misfiring..only to die.
Im convinced fuel is not being delivered...just need to know why??...

Thanks again..Keep it coming!

Clemmo
 
ORIGINAL: clemmo


Im convinced fuel is not being delivered...just need to know why??...


Clemmo
Click to expand...

Insufficient fuel pressure to operate the injectors
Injector solenoids sticking

is that short and direct enough ?[:D]

Putting extra fuel in should help the pump prime an empty system and raise sufficient pressure.

You could help things along a bit by cleaning the spark plugs and filing the electrodes to a nice sharp edge .I often heat mine in the oven . Use easy start to get the engine firing might help too
keep using the 3x way bypass so you can eliminate the DME relay

 
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