No start, no sell...
11-28-2006, 06:56 PM
#46
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Get a noid light. This is a gizmo with an LED in it. They are about 2 bucks at Autozone or whatever youu have there. They should have one that fits Bosch injector plugs. Unplug one of the injector plugs and stick the noid light in. When you crank the engine it should glow.
Speaking of injectors, a leaky o-ring will cause a vacuam leak. I found mine because it made a whistling noise when I shut the engine down.
Speaking of injectors, a leaky o-ring will cause a vacuam leak. I found mine because it made a whistling noise when I shut the engine down.
11-28-2006, 09:04 PM
#47
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New o-rings on the injectors. Also had them cleaned and balanced a year or so ago.
Ah, a new gizmo! I 'll head to Advance Auto and pick one up. I bet it does not glow, I need to start DME tests.
I am leaning towards one of those sensors, speed or reference . . . . .
New fuel pump not that long ago, new fuel, filter - I did check the fuel volume via bi-passing the relay and it moves some fuel.
Might go ahead and try another DME relay - the one on there is new, and I opened it up, the contacts looked OK, not stuck, I dunno . . . . .
Fun stuff!
Ah, a new gizmo! I 'll head to Advance Auto and pick one up. I bet it does not glow, I need to start DME tests.
I am leaning towards one of those sensors, speed or reference . . . . .
New fuel pump not that long ago, new fuel, filter - I did check the fuel volume via bi-passing the relay and it moves some fuel.
Might go ahead and try another DME relay - the one on there is new, and I opened it up, the contacts looked OK, not stuck, I dunno . . . . .
Fun stuff!
11-28-2006, 10:09 PM
#48
...or the AFM is telling the DME that there's no load (no air being sucked) so don't fire the injectors with wide pulses. If you measure correct AFM signals at the DME connector, that will shut me up.
11-29-2006, 07:52 PM
#50
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I was doing some research and failure of the AFM seems to result in hesitations or stumbles - Heck, my 944 will not even run!
Crank over, starts for a second, dies immediately . . . .
I am testing the AFM tonight anyway - I hope that is it, but I dunno . . . .
What happened to Clarks Garage? I could not find it, there used to be a ton and a half of excellent info there -
?????
Crank over, starts for a second, dies immediately . . . .
I am testing the AFM tonight anyway - I hope that is it, but I dunno . . . .
What happened to Clarks Garage? I could not find it, there used to be a ton and a half of excellent info there -
?????
11-29-2006, 08:00 PM
#51
Nissan Rulez
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11-29-2006, 09:27 PM
#52
Originally Posted by MY83944
I was doing some research and failure of the AFM seems to result in hesitations or stumbles - Heck, my 944 will not even run!
Crank over, starts for a second, dies immediately . . . .
?????
Crank over, starts for a second, dies immediately . . . .
?????
If that's not it, it's still pretty satisfying to measure things.
Last edited by gtroth; 11-29-2006 at 09:42 PM.
11-29-2006, 10:49 PM
#54
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I need to test these - my main suspect
Underhood -
In the garage...
Interior
Dash
It needs to run, I'll drive it every day.
Not long and I think it will qualify for historic plates!
Underhood -
In the garage...
Interior
Dash
It needs to run, I'll drive it every day.
Not long and I think it will qualify for historic plates!
11-29-2006, 11:02 PM
#55
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Originally Posted by DanAllen944
I think it was a connectivity issue at work.
11-29-2006, 11:16 PM
#56
Burning Brakes
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I'll put money on the refrence sensor, most likely a bad connection. The sensor itself may be OK, but if you have an intermitant connection into the harness, you'll have problems. You can even see in your first pic that the bottom connector is physically damaged (very typical)
The two sensors on the back of the bell housing provide different signals. Speed sensor gives one pulse for every tooth of the flywheel. Refrence sensor gives one pulse per revolution. The DME needs both to trigger the spark and fuel at the correct time for the engine to fire.
If the tach bounces and you do get fuel injectors to fire and spark, that'll indicate that the speed sensor is feeding it's signal into the DME. All of those processes only rely on the DME knowing that the engine is spinning and at what speed. (The DME relay doesnt even power the fuel pump untill the speed signal is present)
The refrence sensor tells the DME to adjust the timing of the ignition and fuel. There is no vacume advance on the distributor drive; this is the only way that the ignition timing can be advanced/retarded as the engine speed changes.
You can get the sensor as a BWM part for like $56. This was discussed in this post afew weeks ago:
https://rennlist.com/forums/showthre...=bavarian+auto
The two sensors on the back of the bell housing provide different signals. Speed sensor gives one pulse for every tooth of the flywheel. Refrence sensor gives one pulse per revolution. The DME needs both to trigger the spark and fuel at the correct time for the engine to fire.
If the tach bounces and you do get fuel injectors to fire and spark, that'll indicate that the speed sensor is feeding it's signal into the DME. All of those processes only rely on the DME knowing that the engine is spinning and at what speed. (The DME relay doesnt even power the fuel pump untill the speed signal is present)
The refrence sensor tells the DME to adjust the timing of the ignition and fuel. There is no vacume advance on the distributor drive; this is the only way that the ignition timing can be advanced/retarded as the engine speed changes.
You can get the sensor as a BWM part for like $56. This was discussed in this post afew weeks ago:
https://rennlist.com/forums/showthre...=bavarian+auto
11-29-2006, 11:40 PM
#58
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Well, I went ahead and ordered both sensors, the 88 m3 Beemer sensors. Identical replacement it sounds like, hope so.
I am crossing my fingers - probably worth the $130.00 just to rule them out.
I am crossing my fingers - probably worth the $130.00 just to rule them out.
11-29-2006, 11:54 PM
#60
Steve, you had issues with the ref sensor mounting block, right? You might look carefully at the ref sensor gap, and make sure your repair to the mount is holding.
My offer still stands, I should have any part you'd need to test an early 944 with, before you order them.
Can't wait to see your car back on the road!
Regards,
My offer still stands, I should have any part you'd need to test an early 944 with, before you order them.
Can't wait to see your car back on the road!Regards,