MJlife Posted May 4, 2020 Share Posted May 4, 2020 Hello all. I recently rebuilt my 1989 4.0. Brand new internals bored .30 and new Camshaft. Starts just fine sounds great but sputters and starts to backfire on acceleration. Then the idle drops real low. I have been checking all vacuum lines. Brand new o2 sensor I tested b4 install. New plugs wires distributor and IAC. Rechecked TPS setting is right where it should be. Also brand new injectors and fuel regulator. I’m stumped and getting agitated. Please shed some light on what I may be missing. Also timing was spot on did it per the service manual dots lined up and correct amount of pins were counted. Thanks so much hope I can sort this out. It’s been a long build and I’m ready to get drivin. Link to comment Share on other sites More sharing options...
jdog Posted May 4, 2020 Share Posted May 4, 2020 did you index the distributor? Link to comment Share on other sites More sharing options...
MJlife Posted May 4, 2020 Author Share Posted May 4, 2020 So I did the distributor twice. The one I have does not have a spot for you to hold it in place just the #1 on inside. When I set it it points to the #1 plug or just prior but not fully to the #1 marked in the housing. I’ll pull it and drop a pic to help with a visual but seems like it should be right. Thanks. Link to comment Share on other sites More sharing options...
MJlife Posted May 4, 2020 Author Share Posted May 4, 2020 The 1 is marked should it be dead on to that? Link to comment Share on other sites More sharing options...
MJlife Posted May 4, 2020 Author Share Posted May 4, 2020 Gunna give it another go found a write up about it I’ll post any progress Link to comment Share on other sites More sharing options...
MJlife Posted May 4, 2020 Author Share Posted May 4, 2020 So this is it TDC the way I have it now. Going to advance one more tooth and see if anything changes Link to comment Share on other sites More sharing options...
Ωhm Posted May 4, 2020 Share Posted May 4, 2020 Rotor spins clockwise. If #1 cylinder is at TDC on the compression stroke, then trailing edge of rotor tip should be at or just pass your mark. Link to comment Share on other sites More sharing options...
MJlife Posted May 4, 2020 Author Share Posted May 4, 2020 Ok thanks here is the next tooth. Does that seem correct? Link to comment Share on other sites More sharing options...
Ωhm Posted May 4, 2020 Share Posted May 4, 2020 Might be the angle of photo, seem a little far, but your on the correct side. Cap it and start it up. Link to comment Share on other sites More sharing options...
MJlife Posted May 4, 2020 Author Share Posted May 4, 2020 Thanks gunna giver her a go I’ll post of any progress. Link to comment Share on other sites More sharing options...
MJlife Posted May 4, 2020 Author Share Posted May 4, 2020 Thank you so much what a difference!! That was driving me insane. Idle is still a little off but no more sputtering. Link to comment Share on other sites More sharing options...
Ωhm Posted May 4, 2020 Share Posted May 4, 2020 You had crossfire under the cap. Link to comment Share on other sites More sharing options...
MJlife Posted May 4, 2020 Author Share Posted May 4, 2020 Yeah lol me and the distributor Link to comment Share on other sites More sharing options...
MJlife Posted May 4, 2020 Author Share Posted May 4, 2020 If anyone else comes across this thread it is a motor craft distributor for a reference hope it helps someone else. Link to comment Share on other sites More sharing options...
JMO413 Posted May 4, 2020 Share Posted May 4, 2020 http://cruiser54.com/?p=68 Here's the tip on how to index the distributor. His website is amazing! Link to comment Share on other sites More sharing options...
MJlife Posted May 4, 2020 Author Share Posted May 4, 2020 Thanks great tool to have Link to comment Share on other sites More sharing options...
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