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89 Bronco II default timing (Read 7,930 times)

duncanparks

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89 Bronco II default timing
Feb 8^th, 2006 at 12:34pm

I have a 89 Bronco II manual transmission that sometimes when it is started myself and the mechanics who have looked at it thinks it defaults to an ignition timing very retarded, won't rev over 2500 rpm and back fires. I have changed the ECM and distributer pickup and sender units, checked all connection and added extra grounds. It appears more often when the engine hasn't been started in a week or so. If I put a battery charger on it, it starts in the right timing. Any help would be appreciated since I have working on this for over a year.
Thanks

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Randy Freshman Member Picogroup Offline I love YaBB 1G - SP1! Posts: 43 Chewelah WA Washington USA Gender:	Re: 89 Bronco II default timing Reply #1 - Feb 8^th, 2006 at 12:43pm Hi Duncan Have you performed a complete pinout test on computer koeo , koer. What is the timing when it is having the problem.
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duncanparks Freshman Member Offline I love YaBB 1G - SP1! Posts: 3	Re: 89 Bronco II default timing Reply #2 - Feb 8^th, 2006 at 12:47pm No computer printout, just a timing light. I don't remember what it indicated but wasnot advancing the timing.
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Randy Freshman Member Picogroup Offline I love YaBB 1G - SP1! Posts: 43 Chewelah WA Washington USA Gender:	Re: 89 Bronco II default timing Reply #3 - Feb 8^th, 2006 at 12:55pm Hi Duncan It seems you may have an intermentent power problem.When you hook up battery the problem goes away. I would check eec power relay and perform pinout test . Check for voltage drops, use breakout box if possible makes it much easier.
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duncanparks Freshman Member Offline I love YaBB 1G - SP1! Posts: 3	Re: 89 Bronco II default timing Reply #4 - Feb 8^th, 2006 at 1:01pm Thanks, Any guess what the min votage should be during cranking getting to ecu?
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fisher Super Nerd Picogroup Offline I love YaBB 1G - SP1! Posts: 2,731 Concord California USA Gender:	Re: 89 Bronco II default timing Reply #5 - Feb 8^th, 2006 at 9:48pm You ought measure about 11 volts or so, across the terminals (the batt posts themselves), during a normal cranking event.
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Tom Roberts

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Re: 89 Bronco II default timing
Reply #6 - Feb 10^th, 2006 at 9:07am

Duncan,

I don't have a silver bullet on that one for you.

This problem may require the use of a scanner to get codes, do tests, and analyze data. Also a scope may be needed to zero in on the issue looking at the PIP and SPOUT and primary control. The results of these tests would have to be shared so we could offer more suggestions. The problem can be solved.

This link will help you find a qualified professional in your area to take care of this. This may be the most cost effective option. Shops on this search engine are members of the International Automotive Technicians Network:

http://www.iatn.net/dir/search.asp ;

They will be most likely to have the equipment, expertise and resources to tackle this most efficiently.

Tom Roberts
Forums Administrator

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