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xpernet · Last edited by xpernet on Sun Feb 01, 2009 3:38 am; edited 1 time in total

I started converting the car into EFI sometime in October... but ive been really busy. However i got a lot of time on my hands now and im almost done

So far, ive got the MSII wired up and the EDIS. Tested both and they work like a charm... But i cant get the car to run. Ive got everything hooked up except for the Coolant Sensor because i forgot to buy one

Would that be contributing to my no-start problem? I also tried increasing the PW for cold crank... but nothing. I know i have spark, and im getting fuel to the injectors so it seems like a SW issue to me.

Here are some pics... sorry about the mess... enjoy

_________________
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

Rich H · Posted: Sun Jan 25, 2009 5:20 am Post subject:

Back to basics - fuel, spark, air.

Is there any fuel going in?
Is the spark firing near 10 deg BTDC? (Put a timing light on it)
Is the idle screw open?
_________________
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

Min · Posted: Sun Jan 25, 2009 6:03 pm Post subject:

Looking good for sure, I'd get a coolant sensor as soon as possible, since that could definitely effect your startup. It probably isn't the sole cause for not starting, but it won't help you any when attempting to troubleshoot whats going on. Verify fuel on all the injectors, and verify spark on all the spark plugs, I had issues with both those things during my initial setup, one of my injectors wasn't firing, and half my spark plugs weren't, I figured this out by testing the spark plugs out on the valve cover, and pulling the rail out and checking for fuel spraying out of all of them on crank. From there, back to basics like rich said, fuel spark, air, and timing.

Min
_________________
Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting.

Rich H · Posted: Sun Jan 25, 2009 8:27 pm Post subject:

I would also rejisit your crank sensor, that bracket will flex and the sensor will hit the wheel, it needs to be pretty stiff. Mine isn't great but it is very stiff.

Anyone got a decent mounting solution? I want to beef mine up.
_________________
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

xpernet · Posted: Mon Jan 26, 2009 6:09 am Post subject: !

Thanks for the replies... i was pretty frustrated after all this work and she still wouldnt want to start. Im getting spark, but my injectors arent spraying... MS shows its firing them but nothing is happening. Im crossing my fingers that its nothing major... gotta do some more testing so stay tuned!
_________________
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

xpernet · Posted: Mon Jan 26, 2009 6:55 am Post subject:

ok... so i hooked up my volt meter to my injectors, the resistance is up to spec. The MS unit is giving me like 4mv to the injectors. Does that sound right? To me it sounds like the injectors are gummed up... picked em up from an old Ford V8 from the mid 90s at the wreckers.
_________________
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

Min · Posted: Mon Jan 26, 2009 11:52 am Post subject:

xpernet · Posted: Mon Jan 26, 2009 11:54 am Post subject:

Yup, 15ohms.
_________________
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

RC · Joined: 25 Mar 2007 Posts: 2637 Location: Australia

xpernet · Posted: Tue Jan 27, 2009 8:29 am Post subject:

Min · Posted: Tue Jan 27, 2009 10:20 am Post subject:

Ok, at this point you need to test functionality of your fuel injectors. The way I would do this is to run power to one side of the injector, and ground the other side very briefly on your battery, when you tap the wire it should open the injector. If this works on all of your injectors, try the megasquirts injector test mode.

you need to determine were the problem lies, so, by testing the injectors without the megasquirt, you can determine if there is a injector issue, or a megasquirt issue.

Min
_________________
Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting.

pocketscience · Posted: Tue Jan 27, 2009 10:23 am Post subject:

xpernet · Posted: Tue Jan 27, 2009 10:56 am Post subject:

I placed the negative probe to the car's body and positive to the Injector Wire... I know how to use a multimeter its part of my job

... I get 12volts when the ignition is on and nothing when the car is off. It doesnt make sense to me, i traced the wires back to MS and there is no short anywhere. Even if there was a short it should have popped my fuse!

To make stuff more bizzare, as soon as i unplug the injectors i only get 12v on the live wire and nothing on the wire going to MS. As soon as i plug an injector in, i get positive on both wires!!
_________________
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

Paul · Posted: Tue Jan 27, 2009 11:31 am Post subject:

Use a 12V test lamp on both and tell us what you see.
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

RC · Joined: 25 Mar 2007 Posts: 2637 Location: Australia