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2000 concorde 2.7 only 1 coil fires?


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itsfranklin
New User

Mar 12, 2015, 12:01 PM

Post #1 of 6 (1100 views)
2000 concorde 2.7 only 1 coil fires? Sign In

"i just replaced head gaskets and timing chains and waterpump in a 2000 concorde with a 2.7 also put new plugs in it car wont start and now can only get 1 cylinder to fire? injectors are all working checked with diode lights and i checked and have 150lbs compression in each cylinder so timing should be correct all coil wire grounds are grounded i checked with a test light but only 1 cylinder makes the test light flash when i crank the engine?also the cruise light comes on when canking so i switched out the cam sensor but nothing changed."


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Mar 12, 2015, 5:47 PM

Post #2 of 6 (1068 views)
Re: 2000 concorde 2.7 only 1 coil fires? Sign In

Will it start if you unplug the cam sensor?





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Mar 12, 2015, 5:48 PM)


itsfranklin
New User

Mar 12, 2015, 7:41 PM

Post #3 of 6 (1060 views)
Re: 2000 concorde 2.7 only 1 coil fires? Sign In

i tried it and it started! runns smooth at idle but somthin still not right when at higher rpms what does that mean?


Discretesignals
Ultimate Carjunky / Moderator
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Mar 12, 2015, 7:53 PM

Post #4 of 6 (1055 views)
Re: 2000 concorde 2.7 only 1 coil fires? Sign In

Did you install the new timing chain kit?

If you did, you may have the wrong cam sprocket. There are two different cam sprocket that have different windows for the cam sensor to read. One sprocket is for the NGC engine controller and the other sprocket is for the SBEC controller.

The signal that is produced by the cam sensor is dependent on the windows of the sprocket. Here is the cam signal differences between the two sprockets.













Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Mar 12, 2015, 7:53 PM)


itsfranklin
New User

Mar 12, 2015, 8:26 PM

Post #5 of 6 (1049 views)
Re: 2000 concorde 2.7 only 1 coil fires? Sign In

yes i put a new timing kit in i looked at the sprocket and im pretty sure they were identical is there any other possible reason? i put in SBEC Gear w/ 1 Window Near Timing Mark how can i tell which one i needed


Discretesignals
Ultimate Carjunky / Moderator
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Mar 13, 2015, 10:03 AM

Post #6 of 6 (1027 views)
Re: 2000 concorde 2.7 only 1 coil fires? Sign In

Only suggestion I can recommend, besides ripping the timing cover back off and inspecting the cam windows, is to connect a lab scope to the cam sensor signal circuit. Monitor the signal and make sure the signal matches one for an SBEC and is in sync with the crank sensor.

You can tell which sprocket it is by using those waveform captures above. The one with the 1,2,3,1,3,2 pattern is the correct sprocket for an SBEC.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Mar 13, 2015, 10:05 AM)






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