Misfire Cyl 4 (2018 GT)

[MaxHedrm]

Another update:

My guess was right, the exhaust valve spring broke. The plus to that is that the valve didn't fully drop, it still partially retracted. The downside is that there isn't a procedure in the service manual for replacing the spring, so they are waiting on Ford for next steps.

I also sent an email to the Service Director and the Assistant Sales Manager I dealt with to let them know about the case I opened and to thank them for their help.

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[MaxHedrm]

Not crazy about the fact that I’m seeing so many engine issues (and other miscellaneous issues) on this board as I am still waiting to pick mine up.

Trying to remind myself to take it all with a grain of salt and that it makes sense that people would be more likely to share this info on a mustang message board.

The mental checklist of stuff to look at when I finally am able to even test drive my car is getting long, though.

Yeah, it's important to remember that you tend to see the complaints a lot more than the cars that are operating correctly. And Ford does make quite a few of these, so from a percentage perspective it's probably not too bad.

 

[dogiebitt]

Another update:

My guess was right, the exhaust valve spring broke. The plus to that is that the valve didn't fully drop, it still partially retracted. The downside is that there isn't a procedure in the service manual for replacing the spring, so they are waiting on Ford for next steps.

I also sent an email to the Service Director and the Assistant Sales Manager I dealt with to let them know about the case I opened and to thank them for their help.

I just had the same issue happen.
https://www.mustang6g.com/forums/showthread.php?t=100632
They ended up replacing spring and it's back to normal now. Mine didn't drop either so it wasn't catastrophic. Could of been so much worse! Good luck to you. Hope you get it back soon.

 

[usgiorgi]

Yeah, it's important to remember that you tend to see the complaints a lot more than the cars that are operating correctly. And Ford does make quite a few of these, so from a percentage perspective it's probably not too bad.

That's very true unless a particular problem keeps showing its head on numerous cars. AC issue and engine rattles/ticks seem to be pretty common.

 

[MaxHedrm]

Update Time!

I heard from both my service writer (*gasp* proactively, I didn't have to call) and the Ford CSM (well, her backup, she's out sick today). They called within an hour or so of each other.

From the dealer:
It sounds like they are ready to button it back up, they are just waiting on the Valve Cover gasket. It's on backorder until the 19th. If they can get it right away after that, maybe I'll have the car for the weekend. *checking the weather* :rant: :censored: The weather is great until Saturday.

From Ford:
Obviously not eligible for a buyback, but she did mention that they will keep an eye on the backorder & get that escalated if it drags on. They will follow up on Monday.

So ... progress has been made.

 

[MaxHedrm]

I just had the same issue happen.
https://www.mustang6g.com/forums/showthread.php?t=100632
They ended up replacing spring and it's back to normal now. Mine didn't drop either so it wasn't catastrophic. Could of been so much worse! Good luck to you. Hope you get it back soon.

I'm looking forward to comparing your parts list with mine.

 

[MaxHedrm]

Got the call this morning. I have the car back. I'm almost to 100 miles now (99.6 actually)

I did have one fun thing on the way home. I realized on the way out to dinner that I really hadn't gotten on it and stayed on it much. On the way home I had my opportunity. I was getting on the highway and finally got it above 4-5 grand. What a dramatic difference. Totally different car.

I also think it got a Jag that was behind me all turned on. I didn't even know he was back there until he was right on my ass. I guess he thought I was going to stay on it longer than I did, but I didn't really want a ticket. ;) He was an idiot too though, I saw him in traffic ahead. There was a lot of stupid out tonight.

I'll probably add my parts list to this thread. I just glanced at it at the dealer. It looked long.

 

[ryant601]

Got the call this morning. I have the car back. I'm almost to 100 miles now (99.6 actually)

I did have one fun thing on the way home. I realized on the way out to dinner that I really hadn't gotten on it and stayed on it much. On the way home I had my opportunity. I was getting on the highway and finally got it above 4-5 grand. What a dramatic difference. Totally different car.

I also think it got a Jag that was behind me all turned on. I didn't even know he was back there until he was right on my ass. I guess he thought I was going to stay on it longer than I did, but I didn't really want a ticket. ;) He was an idiot too though, I saw him in traffic ahead. There was a lot of stupid out tonight.

I'll probably add my parts list to this thread. I just glanced at it at the dealer. It looked long.

happy to hear you have it back, you've got some enjoying to do!

 

[TnWHTMARE]

Thank you for sharing this. Based on this thread, you have handled this as well and patiently as one could ask. Well done sir and enjoy!!

 

[MaxHedrm]

Thank you for sharing this. Based on this thread, you have handled this as well and patiently as one could ask. Well done sir and enjoy!!

I tried. ;) Sugar vs Vinegar & all. I only cracked the facade twice, once when getting the case created with Ford (that actually amused him more than anything else - it was like a switch flipped, I sternly said the right words, it was created) and once with my Service Advisor to remind them that they had had the car for most of the time since it was delivered. Otherwise I tried to smile whenever talking to them.

 

[MaxHedrm]

Service Invoice

CAUSE: 12650D 0.2, 12650D47 0.1, 12650D55 0 . 3, 12650DX1 0.1, 12650D80
12650D EEC SYSTEM DIAGNOSIS - (QUICK TEST) - L 3475 w 0.20
8 SP*551* SPARK PLUG
1 JR3Z*6513*B SPRING - VALVE
4 *W712334*S440 NUT
1 JL3Z*6584*D GASKET
1 JR3Z*9276*B GASKET
8 JL3Z*9439*A GASKET - INTAKE MANIFOLD
1 JR3Z*90:323:* A TUBE ASY
1 JK6*295* V-BELT
1 BR3Z*6A340*A BOLT
1 GK2Z*6700*A SEAL ASY - CRANKSHAFT OIL - FR
1 7T4Z*8590*A SEAL
1 JT4Z*9E583*A SEAL
1 F1VY*8507*A GASKET - WATER PUMP
1 BR3Z*6020*B GASKET
1 BR3Z*6020*C GASKET
1 BR3Z*6020*D GASKET
1 9L8Z*6C683*A FILTER ASY
1 AA5Z*6714*A FILTER ASY - OIL
8 X0*5W20*QSP MOTORCRAFT SAE 5W-20 API GF-5
1 TA*30* SEALANT - SILICONE
1 V.C*3*B ANTI-FREEZE

12650D47 RELATIVE COMPRESSION/POWER BALANCE - TEST - L 3475 w 0.10
121550D55 IGNITION SYSTEM DIAGNOSIS - L 3475 w 0.30
12650DX1 EEC SYSTEM DIAGNQSIS - (QUICK TEST) - L EXTRA TIME TO REPEAT FINAL QUICK TEST 3475 W 0.10
12650D80 PID RECORDER/MONITOR TEST - L 3475 w 0.10
6007E ENGINE EXCHANGE - DIAGNOSIS (6009/6006/6007/6012) ~ M 3475 w 0.70
6051AXQ COMPRESSION PRESSURE - CHECK - L 3475 w 0.90
6250AXQ CAMSHAFT - REPLACE (6250) - L EXTRA TIME FOR A POST-REPAIR ROAD TEST. 3475 w 0.20
MTINSPECT MTINSPECT 3475 w 9.30


VERIFiED CHECK ENGINE LIGHT IS ON AND ENGINE RUNS
VERY ROUGH, STALLS AFTER STARTING . PERFORMED EEC DIAG AND RETRIEVED
DTCS P0300, P0316, P0302, P0304, P0307, P0308 FROM MEMORY. POWER
BALANCE AND MISFIRE TEST SHOW ALL 8 CYLINDERS MISFIRING WHEN ENGINE IS
RUNNING. MODE 6 DATA LOGGED EVERY CYLINDER WITH MISFIRE COUNTS IN THE
HUNDREDS. RELATIVE COMPRESSION SHOWED CYL #4 AT 0% COMPRESSION. ENGINE
INSPECTION FOUND OIL LEVEL HIGH WITH STRONG FUEL SMELL. INSPECTION OF
SPARK PLUGS FOUND ALL PLUGS BLACKENED/FOULED AND DRIPPING WET WITH
FUEL. PERFORMED DRY MANUAL COMPRESSION TEST AND VERIFIED CYL #4 HAS NO
COMPRESSION, WET TEST FOUND CYL #4 COMPRESSION CAME UP TO 40PSI . RERAN
RELATIVE COMPRESSION AND FOUND CYL #4 NOW AT 29% COMPRESSION. PERFORMED
PORT FUEL INJECTOR AND DIRECT FUEL INJECTOR FLOW TESTS, ALL PASS.
CHANGED ENGINE OIL AND FILTER DUE TO FUEL CONTAMINATION, REPLACES ALL 8
SPARK PLUGS DUE TO FUEL FOULING RESTARTED ENGINE AND FOUND ENGINE
STILL MISFIRING ON ALL 8 CYLINDERS AND WOULD NOT IDLE, STALLS WITHOUT
ACCEL PEDAL BEING DEPRESSED. MONITORED FUEL TRIMS AND FOUND BOTH BANKS
RUNNING LEAN AT OVER 50%-. SUSPECTED POSSIBLE BAD FUEL OR FUEL
CONTAMINATION CAUSING LEAN CONDITION. DRAINED FUEL TANK AND ADDED 5
GALLONS GOOD FUEL. RESTARTED ENGINE AND FOUND STILL MISFIRING ALL
CYLINDERS AND FUEL TRIMS EXCESSIVELY HIGH. UNPLUGGED MAF SENSOR AND
ENGINE WOULD NOW IDLE. MISFIRES PRESENT ONLY ON CYL #4 AND #7. MISFIRE
ON #7 WOULD GO AWAY AND TIP IN BUT CYL #4 WAS A DEAD HOLE. BORESCOPE IN
CYL #4 FOUND ONE EXHAUST VALVE DID NOT CLOSE WHEN ENGINE WAS ROTATED
OVER. REMOVED RIGHT SIDE VALVE COVER TO INSPECT AND FOUND EXHAUST VALVE
SPRING BROKEN, REMOVED TIMING COVER AND RIGHT SIDE CAMSHAFTS TO ACCESS
VALVE SPRING. INSTALLED VALVE SPRING COMPRESSION TOOLS AND REMOVED
BROKEN VALVE SPRING. INSTALLED NEW VALVE SPRING AND REASSEMBLED ENGINE.
STARTED ENGINE AFTER REPAIR WAS PERFORMED AND FOUND NO FURTHER
MISFIRES. PERFORMED FINAL QUICK TEST AND MOITORED FUEL TRIMS. NO DTCS
DETECTED AND FUEL TRIMS NOW WITHIN SPECS. TEST DROVE VEHICLE AFTER
REPAIR WAS COMPLETED, ENGINE NOW RUNS NORMALLY AND NO FURTHER
DRIVEABILITY CONCERNS WERE NOTED AT THIS TIME. REQUEST 9.3HRS MTIME FOR
TIMING COVER, RIGHT SIDE CAMSHAFTS, AND VALVE SPRING R&R.

Looks like I need to check my oil before I drive it again though, since they only listed 8 qts.

 

[dogiebitt]

Looks like I need to check my oil before I drive it again though, since they only listed 8 qts.

Do they have to drain/change the oil for this type of problem? I'm fairly sure that mine was not drained. I have a quick-drain plug and I'm thinking they don't have the right type of fitting to drain it. And it didn't look like there were any wrench marks on the plug from them removing it.

 

[MaxHedrm]

Do they have to drain/change the oil for this type of problem? I'm fairly sure that mine was not drained. I have a quick-drain plug and I'm thinking they don't have the right type of fitting to drain it. And it didn't look like there were any wrench marks on the plug from them removing it.

They did on mine because it was full of fuel ... to the point the oil level was high.

Good thing I checked the oil this morning. Sure enough, 2 quarts low. Called the Service Advisor just to verify what they put in, and he was rather surprised the tech didn't check it.

& boy is that dipstick in a crappy location.

 

[MaxHedrm]

Happy that you got your car back. Now beat the hell out of it to make sure it's broken in right.

Tried! We went down to Waxahachie for Scarborough Faire today. A nice jaunt. Most of you would have cringed at the parking in a damp field part.

I have found that driving an Orange Mustang really attracts stupid. I had an Escalade with a loud exhaust trying to race me or something in traffic. :shrug:

 

[michail71]

Hmm, I'm used to this kind of stuff coming from a Mercedes.

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