LittleHorse
New Member
- Joined
- Jan 22, 2009
- Messages
- 964
- Reaction score
- 1
- Points
- 0
- Location
- Pryor, OK
- Vehicle Year
- 1990
- Make / Model
- Ford
- Engine Size
- 2.9L
- Transmission
- Automatic
Here's the situation:
'90 Bronco II, 2.9 manual trans
Has been very low on power since I bought it a year ago. Can't make it up even slight-moderate hills without losing significant speed or downshifting to fourth. It also has to be cranked for about 3 full seconds before it starts, as long as 10 seconds if it's been heat soaking.
-replaced the fuel filter and the tank at the same time shortly after purchasing it.
-New plugs, wires, cap, rotor
-Discovered slight leak in left exhaust manifold to y-pipe connection. Haven't been able to fix because bolts are rusted on and completely round.
-Swapped MAP sensor and coil independently with my other (non-running) Bronco II and saw no change.
-Cleaned IAC valve and throttle body. No change except for it seemed to take a couple drives to work and back to relearn how to idle, but returned to normal.
At this point I just figured the 2.9 was a pig and have nothing to compare to prove otherwise. From time to time the CEL would come on while sitting in a long drive through wait, but would go back off as soon as I got out on the street. No codes stored in memory afterward.
Months later, started bucking/surging.
-Got lean code from KOER test.
-Replaced fuel filter again. No change.
-Manifold vacuum is steady at 17" Hg.
So is it possible that this is a result of the exhaust leak, or should I start looking at compression, oxygen sensors, fuel injectors, fuel pressure? I'm at the point where I'm gonna start having to spend more money on testing tools and/or parts and would like some guidance and I'm already in this thing for more $$$ than I'd like to be.
'90 Bronco II, 2.9 manual trans
Has been very low on power since I bought it a year ago. Can't make it up even slight-moderate hills without losing significant speed or downshifting to fourth. It also has to be cranked for about 3 full seconds before it starts, as long as 10 seconds if it's been heat soaking.
-replaced the fuel filter and the tank at the same time shortly after purchasing it.
-New plugs, wires, cap, rotor
-Discovered slight leak in left exhaust manifold to y-pipe connection. Haven't been able to fix because bolts are rusted on and completely round.
-Swapped MAP sensor and coil independently with my other (non-running) Bronco II and saw no change.
-Cleaned IAC valve and throttle body. No change except for it seemed to take a couple drives to work and back to relearn how to idle, but returned to normal.
At this point I just figured the 2.9 was a pig and have nothing to compare to prove otherwise. From time to time the CEL would come on while sitting in a long drive through wait, but would go back off as soon as I got out on the street. No codes stored in memory afterward.
Months later, started bucking/surging.
-Got lean code from KOER test.
-Replaced fuel filter again. No change.
-Manifold vacuum is steady at 17" Hg.
So is it possible that this is a result of the exhaust leak, or should I start looking at compression, oxygen sensors, fuel injectors, fuel pressure? I'm at the point where I'm gonna start having to spend more money on testing tools and/or parts and would like some guidance and I'm already in this thing for more $$$ than I'd like to be.