The Autonerdz Community Forums

The Autonerdz Community Forums
https://www.autonerdz.com/cgi/yabb2/YaBB.pl General Public Area >> For Non-Technicians >> 89 Bronco II default timing https://www.autonerdz.com/cgi/yabb2/YaBB.pl?num=1139430841 Message started by duncanparks on Feb 8^th, 2006 at 12:34pm

Title: 89 Bronco II default timing
Post by duncanparks on 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

Title: Re: 89 Bronco II default timing
Post by Randy on 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.

Title: Re: 89 Bronco II default timing
Post by duncanparks on 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.

Title: Re: 89 Bronco II default timing
Post by Randy on 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.

Title: Re: 89 Bronco II default timing
Post by duncanparks on Feb 8^th, 2006 at 1:01pm

Thanks, Any guess what the min votage should be during cranking getting to ecu?

Title: Re: 89 Bronco II default timing
Post by fisher on 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.

Title: Re: 89 Bronco II default timing
Post by Tom Roberts on 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.