need some Ignition Genius help - Defender Source
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Old April 7th, 2010, 03:05 PM
Brent Nevin
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need some Ignition Genius help

95ST

What would be the Reason for Substantial Misfiring in every gear as I pull through 2400rpm-3000 then after 3000 it goes away in the the high end of the spectrum. This doesnt happen everyday but it does on most.

Also: may be related, sometimes when I pull to a stop rpms drop to 100 and it wants to stall before shooting back up on the days it misfires at 2400-3000. check engine light comes on. ordered new silver relays. the ignition module, cap, wires plugs replaced and the timing was adjusted up in San antonio last weekend as it was grossly off.
thanks for any help,
Brent Nevin
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  #2  
Old April 7th, 2010, 07:04 PM
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What code does the ECU throw when the check-engine comes on?

-Hans
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Old April 7th, 2010, 09:15 PM
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Vacuum hose, stepper motor, fuel pressure.
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  #4  
Old April 8th, 2010, 09:44 AM
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Chris Davis
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I would also suspect the alternator since it is RPM specific. If you have a zenier diode going out, then the alternator can leak A/C current causing misfires with the fuel injection. I had this exact problem, mine was at 2400 rpm. There is a thread on this here somewhere too. Had the alternator fixed, problem went away never to return.
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Old April 9th, 2010, 07:50 AM
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Scott Y
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Had a similar problem for years in my 95 D-90. It almost seemed like there could have been water in the fuel tank that would get picked up. Then one day, it would not run except for idle, no power, etc. Replaced the Throttle position sensor and never had another hesitation problem. I suspect there were some bad windings in the TPS (which is a potentiometer) that finally gave up.
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Old April 10th, 2010, 08:48 PM
Brent Nevin
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Im showing a Code 44.. o2 i believe. any ideas?
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Old April 10th, 2010, 08:58 PM
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Code 44 is the left side O2 sensor. And since the engines are batch-fire, it's possible that the whole left side is getting mis-fueled as a result.

I'd pull a few plugs and see if any of them look soaked in fuel or burned from a lean mixtures.

-Hans
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Old April 10th, 2010, 11:44 PM
Brent Nevin
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Hans, pulled the number one plug, burnt and fouled, not wet at all. it was caked with buildup and i put these plugs in last week. what am I looking at now
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Old April 11th, 2010, 11:31 AM
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Hereare a couple of good links with pictures of plugs and their symptoms:
http://www.centuryperformance.com/sp...g-spg-192.html

http://www.dansmc.com/spark_plugs/sp...s_catalog.html
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Old April 11th, 2010, 04:32 PM
Brent Nevin
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It seems like the code 44 pops up when I leave it sitting at idle for awhile and right when the rpms, drop to 0 then back up to 800 for a series of about 4 times the code will pop up.
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