fastpakr
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V8 Engine Swap
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- Joined
- Aug 6, 2007
- Messages
- 8,023
- Reaction score
- 2,840
- Points
- 113
- Location
- Roanoke, VA
- Vehicle Year
- 1999
- Make / Model
- Ford
- Engine Type
- V8
- Engine Size
- 5.0
- Transmission
- Automatic
- 2WD / 4WD
- 4WD
- Tire Size
- 285/75-16
I'm 99% done with the 5.0 conversion on my '99, up to the point of driving it around the neighborhood for a few short test trips. That's created some questions that I've failed to find the answers for, so I'm reaching out for ideas...
Quick info: Full rebuild with a mild cam and an intake spacer. 4R70W trans, 4406 case. Ultrasonic clean of the injectors with new wiring connectors (each of them broke during removal).
Pre-drive symptoms included a rough/chugging idle.
On the initial drive, I noticed that the brakes were wonky. Brief power assist when hitting the pedal, then it would disappear and the engine would stall. I thought it was the booster, but a vacuum gauge on the intake manifold only shows 13 inches. I disconnected and plugged the booster line, then drove it again. No more stalling and the brakes felt normal (aside from getting a leg press workout trying to stop), but the engine's still running rough and on a short near full throttle burst I didn't get nearly the power I was expecting. Enough to get moving, but more like a lethargic tired V6 than a freshly rebuilt 8.
No check engine light (pending or otherwise) according to Torque.
Fuel pressure is showing 70psi on my gauge at idle (spec is 65+/-5 IIRC).
Each plug wire is making the timing light flash (and all plugs and wires are new).
Unplugging the IAC causes an immediate stall. Capping each vacuum line from the intake manifold seems to have no effect on the vacuum gauge. An unlit propane torch also has no effect when moving it near all vacuum lines.
Short term fuel trim is 1-3% on both sides, long term around 15%.
IAT shows 107.6* which seems reasonable.
MAF reading at idle is about 7.3g/s
O2's are fluctuating wildly like I'd expect, except the bank 2 downstream sensor which seems stuck at .065 volts (all O2's are new).
Timing advance comes up at 15*, TPS at 18.82% (both at idle).
Idle speed is averaging around 750RPM.
In 'test results' on Torque, the only fail I get shows up as 'TID: $41 CID:$12' with an allowed max of 896 vs actual of 65,371. I -think- this PID has something to do with the DPFE system, but not sure. For what it's worth, there's also a new EGR valve, tube, and DPFE hoses.
What am I missing? Acts like a misfire, but I can't confirm it. Is there an easy way to test the injectors?
The original donor engine drove fairly well on the trip to the house and I'm using the same exhaust collector/upstream cats, so I don't think there's any issue with the converters. Right now there's no exhaust after the converters at all.
Rough idle:
https://www.youtube.com/watch?v=aZreKiwup2s
Vacuum gauge at idle:
https://www.youtube.com/watch?v=0B7fDR9MLfc
Quick info: Full rebuild with a mild cam and an intake spacer. 4R70W trans, 4406 case. Ultrasonic clean of the injectors with new wiring connectors (each of them broke during removal).
Pre-drive symptoms included a rough/chugging idle.
On the initial drive, I noticed that the brakes were wonky. Brief power assist when hitting the pedal, then it would disappear and the engine would stall. I thought it was the booster, but a vacuum gauge on the intake manifold only shows 13 inches. I disconnected and plugged the booster line, then drove it again. No more stalling and the brakes felt normal (aside from getting a leg press workout trying to stop), but the engine's still running rough and on a short near full throttle burst I didn't get nearly the power I was expecting. Enough to get moving, but more like a lethargic tired V6 than a freshly rebuilt 8.
No check engine light (pending or otherwise) according to Torque.
Fuel pressure is showing 70psi on my gauge at idle (spec is 65+/-5 IIRC).
Each plug wire is making the timing light flash (and all plugs and wires are new).
Unplugging the IAC causes an immediate stall. Capping each vacuum line from the intake manifold seems to have no effect on the vacuum gauge. An unlit propane torch also has no effect when moving it near all vacuum lines.
Short term fuel trim is 1-3% on both sides, long term around 15%.
IAT shows 107.6* which seems reasonable.
MAF reading at idle is about 7.3g/s
O2's are fluctuating wildly like I'd expect, except the bank 2 downstream sensor which seems stuck at .065 volts (all O2's are new).
Timing advance comes up at 15*, TPS at 18.82% (both at idle).
Idle speed is averaging around 750RPM.
In 'test results' on Torque, the only fail I get shows up as 'TID: $41 CID:$12' with an allowed max of 896 vs actual of 65,371. I -think- this PID has something to do with the DPFE system, but not sure. For what it's worth, there's also a new EGR valve, tube, and DPFE hoses.
What am I missing? Acts like a misfire, but I can't confirm it. Is there an easy way to test the injectors?
The original donor engine drove fairly well on the trip to the house and I'm using the same exhaust collector/upstream cats, so I don't think there's any issue with the converters. Right now there's no exhaust after the converters at all.
Rough idle:
https://www.youtube.com/watch?v=aZreKiwup2s
Vacuum gauge at idle:
https://www.youtube.com/watch?v=0B7fDR9MLfc
Last edited: