- Joined
- Jun 13, 2016
- Messages
- 134
- Reaction score
- 40
- Points
- 28
- Location
- Connecticut
- Vehicle Year
- 1989
- Make / Model
- Bronco ii
- Engine Type
- 2.9 V6
- Engine Size
- 2.9L
- Transmission
- Manual
- 2WD / 4WD
- 4WD
- Total Lift
- 6
Hey guys, so since my last post, I got my 2.9 put back together, in the truck, and it's running like a champ, purring like a kitten. You see the only issue that I'm having, which as I understand, is a 2.9 "thing" is that my idle won't go down no matter what I do to it. If I start the truck and bring it up to temp the high idle shuts off and it drops from about 1500/1700 down to roughly 1000 and just sits there. when I rebuilt the motor I replaced the MAP, IAC, TPS, and o2 Sensor. SOOOOOOOO....it cant be a sensor, right? my thoughts are that it may be my o2 sensor because a few years ago I had a high idle issue like this that a new sensor fixed. The last piece of the puzzle, when I tweaked my timing when I first got her running I set the timing at 10deg with the spout unplugged and the engine idles down with the connector out....suspiciously right about at 800 or so, right were it should be, but it runs rough. So, gentlemen, I'm stumped, could it be a timing issue, maybe a faulty or not correctly grounded o2 sensor, who knows maybe the truck is just haunted. I love to hear your thoughts on this.
Oh, and one more thing, after it's warmed up and off "high idle" if I rev it up at all the RPMs are very slow to fall and it seems to hover around 1500 for a long time before it comes back to 1000, some times it just won't and I have to shut the truck down.
Oh, and one more thing, after it's warmed up and off "high idle" if I rev it up at all the RPMs are very slow to fall and it seems to hover around 1500 for a long time before it comes back to 1000, some times it just won't and I have to shut the truck down.