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Engine Missfire on 04 BA Ford Falcon XR8
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SCOTLAND
New User
Apr 6, 2017, 3:10 AM
Post #1 of 3
(4264 views)
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Engine Missfire on 04 BA Ford Falcon XR8
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Hi All
Need help diagnosing a misfire which is present at idle and on load throughout the rev range and has over time become worse and worse .. Vehicle is an 04 BA Ford Falcon XR8 with the 5.4 Boss 260 motor...
These are the things I have checked so far ...
Cats - Been removed
Spark plugs - Checked and in good condition
Coils - Checked and all seem to be firing
Vacuum Leaks on intake and manifold hoses - no smoke test done though
ECU Software - Original and Tuned Software checked ok
OBD Diagnostic - No codes relating to misfire present - tried on FCAR, Snap-On & Autel Scanner
Keen to hear if anyone has any other ideas?
Cheers
(This post was edited by SCOTLAND on Apr 6, 2017, 4:01 AM)
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kev2
Veteran
Apr 6, 2017, 7:45 AM
Post #2 of 3
(4243 views)
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Re: Engine Missfire on 04 BA Ford Falcon XR8
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wow lots going on here -
Cats - Been removed -Is that legal - it is NOT legal in the states, AND can be problematic as codes are sure to arise. *
Spark plugs - Checked and in good condition - I always recommend OEM there are a lot 'gimmick" aftermarket products
Coils - Checked and all seem to be firing - Seem to be firing?
Vacuum Leaks on intake and manifold hoses - no smoke test done though - did you use old school 'carb cleaner spray trick" fast, easy, effective
ECU Software - Original and Tuned Software checked ok - STOCK is best and aftermarket is problematic *
OBD Diagnostic - No codes relating to misfire present - tried on FCAR, Snap-On & Autel Scanner - post ALL codes we can see if related or not.
THe misfire (post codes) can be ignition, FUEL, or mechanical.
Check your injectors, start by reading plugs, use a noid light, fuel pressure and pressure leak down, look at FT's and o2 sensor voltages.
you could enter mode 6 and look at misfire monitors... BUT basics first
Mechanical- might do a compression test. Again knowing ALL codes would be helpful.
* for off road, non registered ie racing this will be OK, you expect these problems.
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