924Board.org

[etiennekuh]

I am trying to get my car running but I can't get it to work.

for instance my fuel pump doesn't get a signal and my injectors don't open (no signal either)

RPM signal is verry weird.
sync err comes on often.

does someone have a file where my car could run on?


Thank You!!

Etienne
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tuning is like a good hobby, it never gets bored

[etiennekuh]

a few problems have disapeerd, I did a firmware update, my RPM signal is now around 100 RPM (is this normal?) I alsow haven't got sync err anymore. my injectors work when I turn the power one, but don't work when I start, what could this be does someone have this problem with his MS? Still the Fuelpump doesn't get a signal, anyone has gotten this problem?

and in megatune sometimes I have more green light than other times, what are there function?

Etienne
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tuning is like a good hobby, it never gets bored

[pocketscience]

Are you sure it's not a wiring issue regarding the fuel pump...?

Do you mean the RPM on your tacho, or displayed in MT? My tacho is reading low compared to MT - haven't had time to look at that yet.


G.
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Whoever said you can't buy happiness forgot about Porsche!
81 924 N/A, GTS lights, Saratoga, interior, headers, Integral cam, EFI (sold)
95 993
69 911

[etiennekuh]

fuel pump works now, still injectors don't work when cranking. what gab have you got between VR-sensor and 36-1 wheel?

and what injector charateristics do you have? ( Low Z)

etienne
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tuning is like a good hobby, it never gets bored

[Rich H]

Are you using a relay baord?
Can you confirm that the wiring tot he FP is OK and does the FP run if you jumper the fuseboard?
forget the dash tach it's crap, MS should read accurately, what are you using as a tach trigger? (EDIS/DIZZY/Other)
What size of injectors do you have?

I'll gladly send you my VE tables but unless you tell me some details I can't even guess if they will be any use (I'm guessing not)

Some pics and details would help a lot.
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1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

[RC]

[flosho]

Check your wiring to make sure that you have 12v+ to the injectors WHILE the car is cranking and not just when you put the key in/accessories on.

The VR trigger gap should be something like 2 mm.. About the thickness of a US penny or similarly sized coin..

Fuel Pump wiring is super simple on these cars. Take the wire that goes to the fuel pump and run that to either the megasquirt ecu or the relay bored, shouldn't have a problem getting the FP primed.

Check the wiring in the hatch for the fp make sure the connections are in good shape. Should be in the back right side of the hatch under the carpet, and sound deadening, etc.
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[This Space For Rent]

[xpernet]

Are you getting the RPM readings from the Tacho or Megatune?

You should be getting around 200-300rpm for normal cranking speed. 100 seems to be too low. You might have the VR sensor wires mixed up... ive had that problem when i was trying to start the car. The injectors will not fire unless you are getting a proper RPM Signal. The initial priming pulse (injectors firing when you turn the key on) is a good sign that the MS unit is not damaged.

As the other guys have mentioned, what kind of iginition system are you using? Did you configure Megatune to interface with the type of ignition system you have?

Oh and make sure you got a nicely charged up battery... if your running low on battery, you will have a harder time diagnosing/solving the problem.
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1977 Porsche 924
Sunroof Delete
Megasquirt II EFI & EDIS
Carrera GTS / 944 Body

"If one does not fail at times, then one has not challenged himself." Ferdinand Porsche