Engine would not start, misfire 8, then started and bad noise
 

I went to start engine, and it would no start, turn over but no start and there was this annoying warning noise. OBD said misfire on 8. Cleared code, waited a little and then the engine started but with a rough idle and bad engine noise, a loud knocking coming from area 8.
I will do a compression test.
I only found one fuel pump relay in the rear for my 2001, is there another one?

and do I remove the fuel injection relay up front?

XK8 only has one fuel pump, XKR has two. There is no up front pump relay.

1-135 psi 2-135 psi 3-135 psi 4-133 psi 5-130 psi 6-132 psi 7-135 psi 8-zero
looks like I need to take off the driver side head and discover what is bad :(

Ouch. Hoping that you find something easily repairable. Show us #8 plug.

plug 8 no damage hum connecting rod failure??
https://cimg2.ibsrv.net/gimg/www.jag...7ce45527b8.jpg

how can I add video with sound

That would be an unlikely cause. Connecting rod failure is usually a direct result of over revving the engine or extreme distress due to oil starvation and bearing /journal overheating. It's more likely you dropped a valve or seat. Thread a boroscope down the plug hole and have a look.

Broken valve spring, or stuck valve would be my guess. Borescope and cam cover off for a look.

The load knock probably indicates a dropped valve seat, valve may be hitting piston, so don't try to start until you have inspected.

Well, I will just have to pull that head to see what it is and fix it. I have done several engines, V8, Porsche 911, Subaru boxer. And I have all the tools so I will proceed and take pictures of head when off.

I will get a boroscope as it is one tool I do not have.

one bolt is not being cooperative to remove the engine front cover. Hand ratchet socket is spinning. I sprayed with penetrant and will try vice grips tomorrow, and then cut slot for screwdriver. it is the second bolt down on the far of passenger bank.

How many miles are on this car ? Have you owned it very long ? Do you have the maintenance / repair records ?


just trying to get an overview...


Z

about 115k miles, owned since 2012, and replaced all tensioners and chains, ramps, pulleys, water pump, etc in 2014
I always use a torque wrench. This one bolt just went bad.

bolt head split trying to use screwdriver, now need to cutoff
https://cimg2.ibsrv.net/gimg/www.jag...33ded88857.jpg

and off

https://cimg4.ibsrv.net/gimg/www.jag...30878024e6.jpg

in other news I have a CH-47 and S-46 fire fighting helicopters on a direct line over my house from local airport where Cal FIre has retardent straight to fire that has gained ground south of Mt Hamilton in Santa Clara county. There timing is such that sometimes they pass each other right overhead.

Stay safe, you can get another car.
Those fires are taking a tole on so many, all the best to them all.

Those head bolts are on tight, I cannot get enough leverage from the side of the car, I will need to set hood in upright position and sit in car to get them off.

The deep socket wants to back off, it started to round the corners of two bolts. How can I remove these. Impact tool?
thanks

Air socket 6 sided and let the ratchet do the work.
I would just hit it for a few seconds at a time.

that's what i will do
I have never had this issue before with any of the engines I have done.