# BA Falcon missing at idle and underload
10/09/2014 | Author: admin | No comments | Categories: blog • Diagnostics | Tags: COP • Crank and cam Waveforms • Engine Missing • Ford Falcon • XR8
# Vehicle
### Ford Falcon BA XR8 5.4L 4 valves per cylinder 2004
# Symptom:
The vehicle drove into the workshop running the vehicle was running ok, but a miss was noticable at idle, the vehicle was then test driven to confirm the customer complaint that it hesistates and misses during takeoff.
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# Diagnosis: 3 hours
Firstly the Falcon Series usually do not show up a check engine light very often, but can still have a few codes present and will still help in tracking down the problem and give a base line to start from.
Once the fault codes where check we found
- P0171 – system too lean bank1 (above amx threshold)
- P2105 – If no related DTC’s are set record the ERR_FR Quiz & ERR_2_Quiz Values in the Warranty Replace the PCM
- U1900 Can Communication Bus Fault – Receive Error.
- Compression test. (all around 155-170) ok
- cylinder leakage test on CYL2 & 3 0% leakage.
- Inside bore scope to visually inspect the valves, dirty seats and slight coked up but ok visually.
## Repairs
# Summary
After spending a few hours on testing, The spark plugs where replaced and 2 new ignition coils fitted, ________________ this was also done the Vehicles KAM memory was reset, which resets the long and short term fuel trims a test drive was conducted and the condition of the oxygen sensors was performed. ___________
## Video
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Similar issue on your vehicle? Call the workshop and we will advise what to expect.