Always start with the simple things. Fit a new battery or at least give the old one a good charge. Then start the car and see what happens.

 

Well, then you can have them remove the injectors and have them professionally cleaned on the bench by one of the many companies that provide that service, like this one.

https://www.witchhunter.com/process2.php

 

He's right. No way a brake job would cause this. I'm a tech for a jag/rover dealer and see a lot of these. No where near as common as the timing chain (and maybe why they had a tsb for this) noise though.

Main symptoms for direct injector stuck open is it'll throw misfire codes for all the cylinders on the bank the faulty injector is on because the faulty injector is dumping all the gas in that cylinder and starving the rest of the injectors , and you can literally smell and see all that fumes coming out of your exhaust.
All the injectors I and my coworkers have done, it's already misfiring at idle and not at rapid acceleration as you stated, but that may happen...

Before you could only buy a set of 4 injectors, but now you can buy a single one now. But if I remember right those injectors isn't cheap

Now it's your choice to replace 1 injector and pay nearly the same labor rate as doing 4 on 1 bank. But if you decide to do only 1 who's to say another injector would go bad, then you'd have to pay labor again to replace it.

This "coincidence" happens, It's happened to me, I've done a service on a jag, test drove it, then just so happens the coolant outlet pipe (another common issue) blows on me and, no the service has nothing to do with the outlet pipe blowing.

 

Does not look like that outfit (witchunter) services DI injectors?
They are much different than the older port and throttle body injectors.

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Do a search for "direct injection injector cleaning"

You can save a lot of money by learning to google!

 

The dude has 15K miles on his engine. Yeah, one got stuck open, but he doesn't need a whole new drivetrain, "just in case."

 

Considering your post is wrong I think you need to do some searching and less talking!
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I am going to have to agree with some of the other members that the culprit may be a bad battery or a loose harness connection. I have not seen many failures such as yours. But I do know that low voltage or an intermittent voltage drop can cause ECM failures causing symptoms similar to what you are experiencing. I just worked on a new JK Jeep Wrangler which the dealer said was an engine problem. Upon closer diagnosis using a Fluke meter to record voltage fluctuations, I was able to find that the battery was defective. Many technicians now rely on diagnostic computers and onboard computer trouble codes. But in reality, they should be using their brain to decipher the real problems.

 

Nothing wrong with my post. You are just weak in Reading and Comprehension. I didn't say that shop was the right one, but one "like" that one. I am not an English teacher for special needs kids like you, so I fear it will take a long time for you to understand your error.

"by one of the many companies that provide that service, like this one."

 

Your post makes no sense.

 

I think the key here is how fast your car went down hill. Do the simple stuff first, like checking for a loose or broken electrical connections, then try a hard reset (Battery disconnect overnight) then possibly a new battery if yours is old or suspect. These injectors are not cheap or easy to remove and replace (A special tool is needed), But I've never seen 4 injectors stick open at the same time, and if your injectors had all stuck open on the same bank you would have absolutely liquid locked that engine. Your sudden mis fire issues on one bank almost certainly points to an electrical gremlin.

 

Just to clarify the effect that a low battery can have, here is exactly what happened to my XFR.

I drove nearly 1,000 miles from the UK to France via the Eurotunnel. So, a good charge for the battery.
The following day I drove 13 miles to a local town. Stopped and started the engine at 2 shops. As I entered a roundabout, I dropped it into 1st gear and gave it a good bit of gas.
Half way round the roundabout, the car suddenly started running as though half of the cylinders were misfiring. I crawled off at the next exit and onto a layby. The engine by this time was sounding awful and the revs were up and down.
I stopped the engine and restarted it, but it was still running really rough.
I popped the bonnet/hood and disconnected the plugs from the airflow sensors, only because I noticed water on them from when I washed the car.
I connected them back up and started the car. It ran perfectly.
As the battery was the original, 7 years old, I bought a new one and have had no trouble since.

That's how sensitive these modern cars are to battery charge.

I hope you get it back in good health.

 

Update here. I finally had a conversation with the Manager of the service department and put forth my thoughts (based on many of the opinions here as well as the other independent mechanics that I spoke to). He had a conversation with the mechanic (who he claims is one of their most tenured and was trained in England) so that he could fully understand the logic behind the initial recommendation. I also know that Jag USA was involved and sent some questions along to the dealer as well, but I don't know what those questions were or the answers for that matter.

In the end, they identified that it was the number 7 injector stuck open and suspected carbon build-up as the likely cause. They further told me that because most of my driving is short hops that I don't get my engine up to the optimal operating temperature for long enough, and consequently the engine doesn't purge itself of these impurities (my words). They did two cycles blowing out the injectors and ultimately replaced injector 7 and spark 7. The coil, apparently, was fine. They also changed the oil. Jag USA covered a portion of the repair. When I picked up the car the service guy told me the whole shop smelled when they did the injector cleanings.

Now, it could just be the placebo effect, but so far the engine seems to purr almost like new. Fingers crossed, I'll be doing about 400 miles to Minneapolis here in a week. Still planning to get the battery checked and perhaps replaced as it's almost 8 years old.

 

Sounds like a good result, hope it continues that way!

 

 

Good result. Give it some gas now and again, that's what they are for.

 

www.injectorrx.com does

 

in this cause all that is a waste of time, IT IS AN INJECTER. it is very common and when you work on them all day long you learn the issues and symptoms quickly