ecgreen
Well-Known Member
- Joined
- Sep 21, 2018
- Messages
- 720
- Reaction score
- 287
- Points
- 63
- Location
- Dunbarton NH
- Vehicle Year
- 1989
- Make / Model
- Ford Bronco II
- Engine Type
- 2.9 V6
- Transmission
- Manual
- 2WD / 4WD
- 4WD
- Total Lift
- 3"
- Tire Size
- 33
I am still chugging along in my spare time on my 89 BII. It looks as if I have solved the oil in the coolant problem, but it is still running rough. Here is where I am at:
- The engine idles at a regular RPM, but sometimes it is a bit high when cold. When its warmed up, its happy.
- It seems like there is a misfire. The engine shakes a bit and it feels like it misses on acceleration sometimes. It also has a somewhat loud exhaust even after I had a reputable company go through the exhaust and look for leaks. As a result I can feel I am not getting full power.
- On acceleration, the engine will have very brief periodic hesitations. They are most noticeable between 2000 and 3000 RPMs.
- There is some sort of clatter sound between 2000 and 3000 RPMs as well. It sounds like valves to me, but I am not sure. Sometimes I can get the engine to not do this if I floor it.
- Air coming out of exhaust is pulsating (for lack of a better word). If I hold a piece of paper up to the tailpipe, it flutters back and forth.
- I have a strange smell I can't quite put my finger on. Its not pure exhaust or fuel smell, but its there when I am driving. I know it sounds weird, but whenever I drive this truck, my eyes get dry in the cab.
Here is what I have fixed and /or ruled out:
- All new vac hoses
- IAC cleaned and tested
- New MAP sensor
- New Motorcraft plugs and wire
- TPS tested good
- Holding good vacuum (measured with gauge)
- Compression is reasonable on all cyls
- Fuel pressure is good, checked with a gauge.
- Tested FPR and its working fine
- Used the screwdriver method to check if injectors are working and they all are.
- Re-did the timing 100000000 times
My thought is that it is a stuck exhaust valve, but I am not sure how to diagnose that.
Thoughts for the gurus?
- The engine idles at a regular RPM, but sometimes it is a bit high when cold. When its warmed up, its happy.
- It seems like there is a misfire. The engine shakes a bit and it feels like it misses on acceleration sometimes. It also has a somewhat loud exhaust even after I had a reputable company go through the exhaust and look for leaks. As a result I can feel I am not getting full power.
- On acceleration, the engine will have very brief periodic hesitations. They are most noticeable between 2000 and 3000 RPMs.
- There is some sort of clatter sound between 2000 and 3000 RPMs as well. It sounds like valves to me, but I am not sure. Sometimes I can get the engine to not do this if I floor it.
- Air coming out of exhaust is pulsating (for lack of a better word). If I hold a piece of paper up to the tailpipe, it flutters back and forth.
- I have a strange smell I can't quite put my finger on. Its not pure exhaust or fuel smell, but its there when I am driving. I know it sounds weird, but whenever I drive this truck, my eyes get dry in the cab.
Here is what I have fixed and /or ruled out:
- All new vac hoses
- IAC cleaned and tested
- New MAP sensor
- New Motorcraft plugs and wire
- TPS tested good
- Holding good vacuum (measured with gauge)
- Compression is reasonable on all cyls
- Fuel pressure is good, checked with a gauge.
- Tested FPR and its working fine
- Used the screwdriver method to check if injectors are working and they all are.
- Re-did the timing 100000000 times
My thought is that it is a stuck exhaust valve, but I am not sure how to diagnose that.
Thoughts for the gurus?