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- Mazda CX-9 Signature
I'm trying my best but couldn't pinpoint this crack. Not sure if its just residue. Can you circle it?
2016~2023 CX-9 DIY Cylinder head replacement (workshop/service manual)
- Thread starter Matthewest9
- Start date
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- Mazda CX-9 Signature
Glad you were able to get it replaced. Thanks for sharing!!
I had the cylinder head replaced on mine and since then I’ve gone through 2 sets of Injector seals. The car runs great with no issues until a cold engine start fails to fire and I get an immediate gasoline odor. Low fuel pressure code. Engine cranks without firing, gas pours out on the ground, message on HUD says “pull over and stop in a safe place”. In both cases, I was able to eventually get the car to run but streams of fuel from front and/or back side of engine run out into puddles under the car.
First occurrence was close to home so a local mechanic diagnosed leaking seals on 2 cylinders (3&4). Replaced all 4 seals at a cost of $260.
Second occurrence happened last Friday afternoon when I was over 300 miles from home. Could see the stream of gas from under the fuel rail on cylinder 1. Found a repair shop that got me one injector seal kit thinking I could replace it in a hotel parking lot as local mechanics all closed for the weekend. Through the evening, I discovered a drive thru lube shop that also offered mechanic services that was open from 8-5 on Saturdays so I booked an online appointment for noon the next day. Struggled to keep the car running long enough to drive a couple tenths of a mile from the hotel to the shop but got it there before they opened and was waiting at the door when they opened. I really needed to get the car fixed to make the 5 hour drive home that day. They replaced all four seals. Two of the 4 weren’t just torn but partially gone. They ripped me off with $627 for the job. Tire Engineers and Lube Express in Trussville, AL, Crooks and rude to boot.
I have no doubt that the issue will occur again as the “fix” both times was just replacing leaking seals with new seals. Thinking we may have lost part of the fuel rail and/or injector components during the head replacement. Seems the seals are getting mechanically damaged in some way that allows them to seal for awhile until the damage eventually cuts through the seal.
The immediate leak upon engine restart (cold restart in both cases) is what puzzles me. In both occasions, I believe it was only one leaking seal at first but after running the engine while that seal was leaking, additional seals were damaged.
Wife is ready to sell the car after the $1000’s we’ve spent in parts & repairs. I’m willing to order an injector and 3 more injector seal kits from Mazda and do the job myself next time to see if I can figure out what’s causing the seals to be destroyed.
Can’t find a detailed diagram of fuel rail and injectors to confirm what I suspect. If someone has something that would show the correct seals installed on the injector and the fuel rail with screws and any washers or spacers at the attachment surface of the cylinder head, I would appreciate it.
Any other theories as to the repeated injector seal failures?
First occurrence was close to home so a local mechanic diagnosed leaking seals on 2 cylinders (3&4). Replaced all 4 seals at a cost of $260.
Second occurrence happened last Friday afternoon when I was over 300 miles from home. Could see the stream of gas from under the fuel rail on cylinder 1. Found a repair shop that got me one injector seal kit thinking I could replace it in a hotel parking lot as local mechanics all closed for the weekend. Through the evening, I discovered a drive thru lube shop that also offered mechanic services that was open from 8-5 on Saturdays so I booked an online appointment for noon the next day. Struggled to keep the car running long enough to drive a couple tenths of a mile from the hotel to the shop but got it there before they opened and was waiting at the door when they opened. I really needed to get the car fixed to make the 5 hour drive home that day. They replaced all four seals. Two of the 4 weren’t just torn but partially gone. They ripped me off with $627 for the job. Tire Engineers and Lube Express in Trussville, AL, Crooks and rude to boot.
I have no doubt that the issue will occur again as the “fix” both times was just replacing leaking seals with new seals. Thinking we may have lost part of the fuel rail and/or injector components during the head replacement. Seems the seals are getting mechanically damaged in some way that allows them to seal for awhile until the damage eventually cuts through the seal.
The immediate leak upon engine restart (cold restart in both cases) is what puzzles me. In both occasions, I believe it was only one leaking seal at first but after running the engine while that seal was leaking, additional seals were damaged.
Wife is ready to sell the car after the $1000’s we’ve spent in parts & repairs. I’m willing to order an injector and 3 more injector seal kits from Mazda and do the job myself next time to see if I can figure out what’s causing the seals to be destroyed.
Can’t find a detailed diagram of fuel rail and injectors to confirm what I suspect. If someone has something that would show the correct seals installed on the injector and the fuel rail with screws and any washers or spacers at the attachment surface of the cylinder head, I would appreciate it.
Any other theories as to the repeated injector seal failures?
Attachments
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- W WA
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- 2024 CX-5 Premium
Here is a video to see the crack while engine is running.
I am not too familiar with high pressure fuel pumps/ injectors but I reused the original injector seals (140k miles) with no issues.
It’s almost like your getting too much pressure or your missing a seal/ bushing to direct the pressure properly
There are 4 seals/ bushings total that come in an injector seal kit plus the clip
The third set of injector o-rings failed on my 2016 CX-9 last week so I decided to replace them myself this time.
Bought 4 seal kits from Rock Auto. GB8071 and the seal tool kit GBTK-001. $130 total.
When I removed the fuel rail, I found 4 damaged O-rings. No Back-up rings on any of the injectors. Only found two of the Stopper rings in the fuel rail at cylinders 2 and 4.
I replaced all seals (Teflon seal at tip, Back-up ring with talented side down, then O-ring, then Stopper ring snapped into the groove at the rail end) on all 4 injectors. Found a Mazda video online that says the Teflon seals need to be replaced any time the injectors are removed from the engine block. To my knowledge, the Teflon seals were original to the first engine block (cracked and replaced). Injectors on my car were removed from the engine at least 4 times! The GB tool kit has a QR code that links to an instructional video for installing the seals. I was not able to use the metal clip in the GB seal kit because the tab on it was too wide for the mating slot in the fuel rail.
The EGR cooler had to come out of the car, but that gave me access to remove 7 bolts holding the intake manifold to the block. I was then able to pull the manifold forward enough to remove the fuel rail to service the injectors. Would have gone much quicker except the shop that replaced the previous failed o-rings over torqued every bolt they removed and rounded some of the bolt heads. Took an impact gun and a special socket to just get the intake manifold off!
I did complain to the Express Oil/Tire Engineers customer satisfaction folks. They agreed to refund $510 (labor fees) of the $627.21 they charged me since the “repair” they provided failed within 3 weeks and less than 500 miles of their service.
Frustrated that at least two of the mechanics that replaced the seals never seemed to question why multiple seals failed at the same time. I was very disappointed that neither of them took the time to look into what seals were required for my car before they just replaced the multiple damaged o-rings and put the injectors back in the engine. Won’t be going back to either of them.
Proper seal installation.
Damaged seals and 2 stopper rings removed:
Damaged seal inside rail:
Bought 4 seal kits from Rock Auto. GB8071 and the seal tool kit GBTK-001. $130 total.
When I removed the fuel rail, I found 4 damaged O-rings. No Back-up rings on any of the injectors. Only found two of the Stopper rings in the fuel rail at cylinders 2 and 4.
I replaced all seals (Teflon seal at tip, Back-up ring with talented side down, then O-ring, then Stopper ring snapped into the groove at the rail end) on all 4 injectors. Found a Mazda video online that says the Teflon seals need to be replaced any time the injectors are removed from the engine block. To my knowledge, the Teflon seals were original to the first engine block (cracked and replaced). Injectors on my car were removed from the engine at least 4 times! The GB tool kit has a QR code that links to an instructional video for installing the seals. I was not able to use the metal clip in the GB seal kit because the tab on it was too wide for the mating slot in the fuel rail.
The EGR cooler had to come out of the car, but that gave me access to remove 7 bolts holding the intake manifold to the block. I was then able to pull the manifold forward enough to remove the fuel rail to service the injectors. Would have gone much quicker except the shop that replaced the previous failed o-rings over torqued every bolt they removed and rounded some of the bolt heads. Took an impact gun and a special socket to just get the intake manifold off!
I did complain to the Express Oil/Tire Engineers customer satisfaction folks. They agreed to refund $510 (labor fees) of the $627.21 they charged me since the “repair” they provided failed within 3 weeks and less than 500 miles of their service.
Frustrated that at least two of the mechanics that replaced the seals never seemed to question why multiple seals failed at the same time. I was very disappointed that neither of them took the time to look into what seals were required for my car before they just replaced the multiple damaged o-rings and put the injectors back in the engine. Won’t be going back to either of them.
Proper seal installation.
Damaged seals and 2 stopper rings removed:
Damaged seal inside rail:
Attachments
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- Mazda CX-9 Signature
Glad to hear you were able to fix it PROPERLY by yourself. This is exactly why I don't like other people working on my car. They rip you off and they don't fix the issue and cause MORE damage in the process.
Thanks for sharing the info and pics!!
Thanks for sharing the info and pics!!
I was surprised that there aren’t many YouTube videos on the 2016-2023 CX-9’s. That’s was a big part behind why I didn’t tackle it myself when it happened the first time.
