Hi all!

I'm new here, but I recently purchased a 2005 Jaguar Type S v8 with 114,000 miles. It has misfires in cylinders 1 and 4. I knew there were problems with the car, but I'm wondering what the best course of action to take is! I've included a picture of the codes, and the guy who sold it to me said "my mechanic recommends new spark plugs/ignition coils" but I'm worried that may not be the extent of it? If anyone else has had similar issues, please let me know! I'm trying to restore the car to it's former glory (I will start working on the car in about a week), and any common issues around the 100,000 mile mark anyone else knows about would be so appreciated! Also- do you think this is even fixable? If the spark plugs/ignition coils don't fix it, and fuel injectors don't either, she's worth scrapping, no?

Thanks,
Jackson

 

Welcome to the forum.

Failure of the coil units is not uncommon, and at the number of miles listed, spark plugs should be renewed.

Another cause for coil unit failure is caused by engine oil finding its way into the spark plug wells due to leaking cam cover spark plug boss seals. It's best to replace the cam cover seals and spark plug boss seals whilst replacing the coil units and spark plugs.

Another common cause of random DTCs is low battery voltage. With the ignition in the OFF position, use a voltmeter to read battery voltage across the battery terminals. There should be a minimum of 12.6 volts. If not, charge the battery for five hours at 2 to 5 amps and retest. If there's still less than 12.6 volts, the battery is suspect and should be replaced.

 

One other thing to consider is doing a compression test when the spark plugs are out of the heads.

 

The plugs were due to be changed at 100,000 - were they?

NGK IFR5 N10 (pre-gapped, with anti-seize already)

Probably not the cause but if you're in there and they weren't changed...

To DIY, have engine warmed up so they come out easier.

 

Soo, OP: You purchased the car with known/disclosed issues and did not know how to fix them...? Right. You have asked us for advice on repairs vs scrapping the car, but have not bothered to tell us your location, which makes a difference.

If you had posted the expected "Intro" in the New Members Forum, that might have given us a clue or two. What your posted trouble codes tell us is that your misfires are serious enough to potentially cause fatal catalyst damage, which WILL have an impact on the keep/scrap equation. Don't run the engine until you get the misfired sorted.

 

@S-Type Owner

I don't see what my location has to do with this? I live in west Hollywood though. I did a lot of research on how to fix them, I just wanted 3rd, 4th and 5th opinions from *actual* jaguar owners who know their cars, before my inexperienced self messed anything up, that's all. I did post an intro, if it wasn't up to your expectations- lower them. I bought the car on a whim, as it was $1500. That is nothing. If I can get the car back to it's shape, great! If not, oh well. Who cares, at least I got experience for the next car I'll buy (07-08 STR) in running condition. I was told the the engine has been ran about 90 seconds in the last few months, only reason is to hear the state/frequency of the misfires.

SOMETIMES THE ENGINE RUNS FINE IDLE FOR 5-10 SECONDS, THEN IT MISFIRES FOR A FEW MORE SECONDS AND GOES BACK TO BEING FINE (for full disclosure)

 

@JAGV8

No sir, they were not changed at 100,000 according to Carfax. I appreciate the part #!! I will buy them from there, I also found some here which are half the price of buying NGK's spark plugs and ignition coils

https://a-premium.com/product/8x-Ign...RoCLdEQAvD_BwE

I probably shouldn't sacrifice quality for quantity (cost) right? Who knows. I'll buy the cheap ones first and replace with the NGK's in about a month, just to see A-Premium's quality. NGK is vetted.

Thanks for the warm up tip too mane!! I don't believe the spark plugs have been changed since 100,000 miles. On the carfax, the same day the car was at 99,190 it got "Air filter replaces, front brake rotors replaced, brake rotors replaced, fuel filter replaced, oil and filter changed, and braked checked". What more should've been done at 100k?

 

@NBCAT Everything about this response is comprehensive, and I truly do appreciate you as well. I will replace the ignition coils/spark plugs myself, but how hard do you think the seals would be to replace? If it requires decent engine knowledge, I'd rather take it to a mechanic than possibly **** something up. I will totally look at the battery voltage, and that's one of the problems for sure! The battery is dead, and had to be jumpstarted for the engine to start. Any specific batteries I should buy???

 

wow

 

Yep. I missed the intro. "Yoyo mane" slipped right by me. My bad. Most forum members put their location in their profile so others do not have to play detective.

Now as to the OP's question regarding location, this is a forum with international membership and the cost of repairs and market value of a Jaguar S-type in scenic LA are different than the same factors in say, gloomy Glasgow; this impacts the fix or scrap decision, no?

As to the OP's instructions to lower my expectations: Done.

My advice on not running the engine to avoid damaging the catalysts, however, stands.

 

The cam cover gaskets and spark plug boss seals are relatively easy to replace, but if you do not have any mechanical ability to perform the tasks yourself, find a competent Jaguar specialist to do the work.

Replace the battery with one that meets Jaguar specification. The recommended battery for the X200/202/206 is an H8 type shape and output.