944/968 conv start problem
10-17-2004, 07:40 PM
#48
Burning Brakes
Originally Posted by Jared944
with DME unplugged - 5.61
the 'other end' of green is PIN 1 which is not connected to anything because DME unit is unplugged
yet you measure 5.6 ohms from green to ground ??
should be infinity (or beyond !)
10-17-2004, 08:03 PM
#51
Racer
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Wait.... I see what your saying.
I disconnected the connector next to the brake booster, and tested pin#1 (ignition "green" wire) that lead to the coil, and it read 6.6. I then tested the wire that lead to the DME, and that was infinity (and beyond!!). Just to be sure, I tested pin 1 of the DME, and that was infinity. Sooooooo.... the wire is grounding out somewhere between the connector next to the brake booster and the coil, right???
I disconnected the connector next to the brake booster, and tested pin#1 (ignition "green" wire) that lead to the coil, and it read 6.6. I then tested the wire that lead to the DME, and that was infinity (and beyond!!). Just to be sure, I tested pin 1 of the DME, and that was infinity. Sooooooo.... the wire is grounding out somewhere between the connector next to the brake booster and the coil, right???
10-17-2004, 08:21 PM
#52
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Ok..... there are 2 wires going into the ignition coil pin next to the brake booster..... One wire goes to the coil (green), ant the other to the ALARM SYSTEM!?! I only have a aftermarket alarm, and it doesn’t kill the engine at all.
So, I cut that lead, and now the coil wire isn’t being grounded out anywhere. Still no +12 volts to the green wire when the ignition is in start, though.
So, I cut that lead, and now the coil wire isn’t being grounded out anywhere. Still no +12 volts to the green wire when the ignition is in start, though.
10-17-2004, 09:52 PM
#53
Burning Brakes
Originally Posted by Jared944
I only have a aftermarket alarm, and it doesn’t kill the engine at all.
So, I cut that lead, and now the coil wire isn’t being grounded out anywhere. Still no +12 volts to the green wire when the ignition is in start, though.
So, I cut that lead, and now the coil wire isn’t being grounded out anywhere. Still no +12 volts to the green wire when the ignition is in start, though.
so first...
from the coil's green wire (not connected) with the DME unit not connected, the resistance measured in relation to ground is now infinity ?
10-17-2004, 10:10 PM
#54
Burning Brakes
and when you reconnect the green wire to the coil...but leave the DME unplugged...and turn the key to on the voltage should read about +12 on the coil's small black wire AND the green wire
do you have that?
and when you plug the DME unit back in...what voltage do you read on the green lead with the key 'on'
do you have that?
and when you plug the DME unit back in...what voltage do you read on the green lead with the key 'on'
10-18-2004, 12:24 AM
#55
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so you have the fuel pump running now when the cars ignition is on? and still no spark. how new is the reference sensor and or speed sensor? if you are getting power at the coil it might be a faulty sensor... jsut a thought. check the connections on those sensors?
10-18-2004, 02:25 PM
#57
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No, I haven't had a chance to test anything out just yet. I had to work last night, and I have to go to school later today. Needless to say, I would rather be working on my car 
Ill shoot the coil again a little later, and test out that reference sensor. I positioned it .08 MM away from the flywheel myself, so that should be good. Would that cause a no spark condition? Also, with all those connection is the pass footwell, I only have pin#7 hooked up (the alarm) to term 15. I wonder if the computer requires any more signal input?
I really appreciate your help guys...Ill keep you informed!!
Jared
Ill shoot the coil again a little later, and test out that reference sensor. I positioned it .08 MM away from the flywheel myself, so that should be good. Would that cause a no spark condition? Also, with all those connection is the pass footwell, I only have pin#7 hooked up (the alarm) to term 15. I wonder if the computer requires any more signal input?
I really appreciate your help guys...Ill keep you informed!!
Jared
10-18-2004, 02:30 PM
#58
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Oh, BTW, I tested to see if the DME itself was getting power... I have term 30 power supplied to the dme through Pin# 18, and a almost perfect ground on pin 24. Looking at the schematic, I should test Pin #2 for a good ground signal as well, considering that it is labeled "ground, ignition".
10-19-2004, 01:25 PM
#59
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I HAVE SPARK!!
It turned out to be a loose reference sensor connector (I owe both Kevin and Tom a 12 pack for the help). I feel kind of stupid, since its such an easy thing to fix.
Well, that’s the good news. The bad news is that when I first tried to start the car, it turned for about 3 seconds, backfired, and the engine nearly died. I saw a ~small~ bit of smoke coming from the back of the engine. I investigated the smoke, and saw nothing very alarming.
I tried to start it again.
Again it backfired, the engine nearly died, but it turned over again a bit faster. No smoke. I tried a few more times, and the engine seemed to turn over better with each try. I had to stop my attempts because the battery was nearly dead...
Soooooo, my question for you guys is : Would that be normal for an engine to do since it hasn’t been ran for quite a while? Should I stop trying, possibly because I’m causing some kind of problem?
I know the firing sequence for the engine is 1, 3, 4, 2.... so does that mean the spark plugs are in order on the cap from 1 (on the top) to 2 (on the bottom)? Sorry about such a stupid question, But I have to ask anyhew.
Again thanks for you help so far!!!
Jared
It turned out to be a loose reference sensor connector (I owe both Kevin and Tom a 12 pack for the help). I feel kind of stupid, since its such an easy thing to fix.
Well, that’s the good news. The bad news is that when I first tried to start the car, it turned for about 3 seconds, backfired, and the engine nearly died. I saw a ~small~ bit of smoke coming from the back of the engine. I investigated the smoke, and saw nothing very alarming.
I tried to start it again.
Again it backfired, the engine nearly died, but it turned over again a bit faster. No smoke. I tried a few more times, and the engine seemed to turn over better with each try. I had to stop my attempts because the battery was nearly dead...
Soooooo, my question for you guys is : Would that be normal for an engine to do since it hasn’t been ran for quite a while? Should I stop trying, possibly because I’m causing some kind of problem?
I know the firing sequence for the engine is 1, 3, 4, 2.... so does that mean the spark plugs are in order on the cap from 1 (on the top) to 2 (on the bottom)? Sorry about such a stupid question, But I have to ask anyhew.
Again thanks for you help so far!!!
Jared
10-19-2004, 03:00 PM
#60
Burning Brakes
look at:
http://www.clarks-garage.com/graphics/distcap1.gif
btw...you had a couple of problems with no spark...very tuff to troubleshoot more than one problem causing a same condition
nice job ! almost there !
(might need to get those injectors cleaned if it hasn't run in a very long time...)
http://www.clarks-garage.com/graphics/distcap1.gif
btw...you had a couple of problems with no spark...very tuff to troubleshoot more than one problem causing a same condition
nice job ! almost there !
(might need to get those injectors cleaned if it hasn't run in a very long time...)