HR300
HR300TX
- Joined
- Feb 22, 2018
- Threads
- 1
- Messages
- 6
- Reaction score
- 4
- Location
- Houston, Texas
- Vehicle(s)
- 2017 GT350R
- Thread starter
- #1
Hi,
I am the original owner of a 2017 GT350R. Been experiencing engine misfire codes for a few months - I have other cars and truck so do not
routinely drive the car but generally do drive the car once a month or more for grins.
A short summary about this car.
All stock, with about 14,000 miles, of which about 4,000 of those track miles. Car has been well maintained. Ford replaced transmission under an extended warranty, and clutch was replaced too which I paid for - this was at around 12,000miles. Car is now out of warranty. No other problems.
I am asking for comments concerning the solution that currently my mechanic is recommending to cure this misfire problem. So I will outline the misfire codes
and items that were checked.
Primarily, the misfire code has been PO307 which is for Cylinder 7. Though there have been PO300 a couple times and PO304 at least once. Especially,
PO307 code appeared 6 or 7 times after clearing and resulting in CEL remaining on. I could never feel the engine misfire or detect a change in performance
or engine sound, and neither could my mechanic. Engine misfire codes appeared on moderate acceleration from about 3000 - 4000 rpm. Car started and
idled as normal.
Items that have been checked:
1) A couple new tanks of gasoline (93 octane) and one additional bottle of fuel system cleaner/additive.
2) Switching out Cylinder 7 spark plug and coil - but misfire code stayed on P0307. Plugs and coils appeared in great condition.
3) Cleaning and flow testing all fuel injectors - all normal.
3) Compression and leak down tests - normal.
4) Checking the wiring signals to the ECU, were normal.
5) Inspection of internals (valves etc,) Cylinder 7 with borescope as mechanic thought perhaps there could be failures beginning even though compression
and leak down tests were normal.
6) NOW - my mechanic is telling me the misfire problem has been pinpointed as faulty injector drivers from Cylinder 4 and 7 registering negative voltage and
recommends replacing the ECU and programming of ECU. I have not discussed this yet with my mechanic but I have trouble understanding how this could be
happening as it seems this would result in no fuel going to those cylinders which seems like it would major major noticeable.
Appreciate comments / recommendations. A comment about my mechanic - he has a great shop and been in business working on high end cars and trucks - works on mustangs because he has owned and raced a few of them and I have been going to him a few years with a couple of my cars.
Thanks for any help.
Karl
I am the original owner of a 2017 GT350R. Been experiencing engine misfire codes for a few months - I have other cars and truck so do not
routinely drive the car but generally do drive the car once a month or more for grins.
A short summary about this car.
All stock, with about 14,000 miles, of which about 4,000 of those track miles. Car has been well maintained. Ford replaced transmission under an extended warranty, and clutch was replaced too which I paid for - this was at around 12,000miles. Car is now out of warranty. No other problems.
I am asking for comments concerning the solution that currently my mechanic is recommending to cure this misfire problem. So I will outline the misfire codes
and items that were checked.
Primarily, the misfire code has been PO307 which is for Cylinder 7. Though there have been PO300 a couple times and PO304 at least once. Especially,
PO307 code appeared 6 or 7 times after clearing and resulting in CEL remaining on. I could never feel the engine misfire or detect a change in performance
or engine sound, and neither could my mechanic. Engine misfire codes appeared on moderate acceleration from about 3000 - 4000 rpm. Car started and
idled as normal.
Items that have been checked:
1) A couple new tanks of gasoline (93 octane) and one additional bottle of fuel system cleaner/additive.
2) Switching out Cylinder 7 spark plug and coil - but misfire code stayed on P0307. Plugs and coils appeared in great condition.
3) Cleaning and flow testing all fuel injectors - all normal.
3) Compression and leak down tests - normal.
4) Checking the wiring signals to the ECU, were normal.
5) Inspection of internals (valves etc,) Cylinder 7 with borescope as mechanic thought perhaps there could be failures beginning even though compression
and leak down tests were normal.
6) NOW - my mechanic is telling me the misfire problem has been pinpointed as faulty injector drivers from Cylinder 4 and 7 registering negative voltage and
recommends replacing the ECU and programming of ECU. I have not discussed this yet with my mechanic but I have trouble understanding how this could be
happening as it seems this would result in no fuel going to those cylinders which seems like it would major major noticeable.
Appreciate comments / recommendations. A comment about my mechanic - he has a great shop and been in business working on high end cars and trucks - works on mustangs because he has owned and raced a few of them and I have been going to him a few years with a couple of my cars.
Thanks for any help.
Karl
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