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Unread 08-31-2013, 10:45 AM   #1
82Renegade
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Help - I'm stumped - ignition issues

Appreciate any help on this- I'm pulling my hair out. CJ has been running strong for years since any changes were last made to the ignition or TBI systems. The other day it randomly wouldn't start, and in troubleshooting seems I'm not getting spark to the cylinders. I AM getting spark from the coil into the distributor cap. I've tried changing the cap and rotor, but no dice. I've tested the pickup coil and its right on at 650ohm. What else could it be?

82CJ7, Howell TBI, Ford e-coil, MSD 6A ignition

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Unread 08-31-2013, 10:48 AM   #2
82Renegade
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Any also, let me note that the fuel injectors are firing, so I don't think its an ECM issue.
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Unread 08-31-2013, 01:42 PM   #3
LumpyGrits
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Not much on FI.
This is SWAG on my part. Have you tested the CPS and fuel psi?
Ever change the fuel filter?
LG
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Unread 08-31-2013, 05:45 PM   #4
petey156
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So you have fuel and spark, But it still does not. Fire?

Have you checked for spark at the plugs?

Are the plugs. Damp with fuel or fouled?
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Unread 09-01-2013, 12:20 AM   #5
W7NB
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Check your fuel pump. Seems like the most common problem on TBI converted rigs.
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Unread 09-01-2013, 12:31 AM   #6
titomars
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Quote:
Originally Posted by LumpyGrits View Post
This is SWAG on my part.
What is SWAG?
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Unread 09-01-2013, 07:48 AM   #7
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Sophisticated Wild @ssed Guess. It's very scientific. (And usually right)
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Unread 09-01-2013, 09:19 AM   #8
LumpyGrits
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What is SWAG?
It's 'Jeep' speak,,,,,,,,
LG
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Unread 09-01-2013, 11:15 AM   #9
gmakra
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Test your MSD http://www.msdignition.com/page.aspx?id=3206
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Unread 09-06-2013, 03:30 PM   #10
82Renegade
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MSD tests ok. I also get spark out of the coil into the distributor. Just because I can't figure out what else it could be, I just replaced the distributor, cap/rotor, plugs and wires. Still no go. Plenty of gas in the carb, just no spark. What else could it be? Pulling my hair out.
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Unread 09-06-2013, 03:35 PM   #11
LumpyGrits
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Did you test the module in the dizzy?
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Unread 09-06-2013, 03:48 PM   #12
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Spark is leaving the coil but I didn't see where you checked to make sure the plugs are actually sparking. If they aren't I'm thinking pooched distributor drive gear or cam gear maybe.

Disconnect the coil from the dizzy, take the cap off and turn it over to make sure the rotor is turning.
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Unread 09-06-2013, 03:55 PM   #13
LumpyGrits
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Hmmmmmmm, OP replaced the whole dizzy........Maybe it wasn't 'indexed' correctly on the install and is waaaaaaaaay out of time.
Easy enough to do........
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Unread 09-06-2013, 04:55 PM   #14
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Quote:
Originally Posted by LumpyGrits View Post
Hmmmmmmm, OP replaced the whole dizzy........Maybe it wasn't 'indexed' correctly on the install and is waaaaaaaaay out of time.
Easy enough to do........
LG
That was my next thought. If the rotor is turning and the plugs are sparking it could be timing related (chain jumped/broken etc.)

I don't know TBI's but what effect would it have if the centrifugal advance that is normally disabled for these swaps suddenly started working again?.....assuming the OP used the stock dizzy and locked down the advance.
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The advertised position for a topless, dirty jeep girl has been filled......by my wife. Thanks to all that applied.
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Unread 09-10-2013, 07:59 AM   #15
82Renegade
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I am confident I have the new dizzy aligned properly. I'm completely out of ideas on what to do.

In summary: Jeep was running great, with no changes being made just stopped firing up. Testing yielded that it was a spark issue.
Have replaced, coil, distributor, cap, rotor, plugs & wires
Testing confirms getting spark out of coil into disty
No spark at plugs
Distributor has a good ground

What am I missing? It has to be something minor- what wire could be loose or poorly grounded?
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