Hey guys and gals. I'm new to the fourm and have been searching the internet for a few hours for a issue like mine. Ok so I drove to Walmart parked for 3 mins and started the car its a 2000 s type 4.0 with 139000 on the dash. Well after I started it was not running good at all it was just fine when I turned it off. Well I got home and it ran like crap, I scanned the computer and got lean bank 1 and never 7 misfire. We replaced all coils and plugs still have the issue. I am seeing 30ish on the fuel short and that's bank 1 and 2. I can screen shot if some one can help with reading all this. New to a jaguar here and looking for some help any help would be awesome right now.


Joe

 

Hi Joe,

Welcome to the forum.

On your scanner, what value is shown for fuel pressure?

If good, connect a mechanical gauge to the test port on the injector rail. Compare this reading to the scanner value..

 

Hey thanks for the reply. So its at 40 psi on scanner and on manual test. Fuel filter has been changed about 2 weeks ago. So a update I have taking the injector wire connector off while running with absolutely no change in engine. So I have purchased a new injector and will be here by Tuesday. I hope it's just a injector. I tested the injector wires and it's reading 12 volt not running and 13 plus when running. It's so odd that it happend so sudden just turned the car off for a few mins and then fired it up and boom problem. I have only had the car about 3 weeks and it was owned by a neighbor that just let it sit. It fired right up and ran great until the other day. Car is beautiful and low miles plus it was 500 bucks! Just needed brakes and a few other little things after all fluids changed. Any advice is awesome keep it coming. It's only mis fire on number 7 too. Lean bank 1 as well. I can do a read out if needed to help.

 

Jumped timing?

Have the tensioners etc been replaced for the newer kind? (Typically, no, but should have been.)

 

Pretty sure it didn't jump, I will end up tackling the new timing chains and everything related soon. Engine sounds good just missing and a ping every now and then while idling more of a low grade gas ping. I filled up to a full tank and I'm half way through it when this happend so not sure. We did put a thing of techron cleaner in it as well. Thank you guys for helping it is awesome to get help from other members.

 

As a part of the engine management system on your 4.0 there are "knock sensors"; so, if you are getting "pinging" sounds from the engine, you may well have a mechanical timing issue...

 

I do know it has two knock sensors. There's no codes for knock I just occasionally hear a ping. I really don't think it's jumped time. Like i was sayong ot was running amazing when i turned it off then when i started it up few moments later it started running rough after id say 10 secs of starting. I do have a hole in my resonators that I will pe straight piping today instead of replacing. I'm in hopes the injector is bad. I am going tontry and move the number 7 to another location to see if the problem follows the injector.thank you for your reply everyone!

 

Yhis is whe. Giving a small bit of gas pedal

Idling

here some photos of her running. Anyone make anything of this?

 

You need to watch a graph if you're going to look at the voltages.

The trims look awful but did you do them in the way so often described?

 

So I just started the jag for a first cold start for them. There is two with idling and the one I gave it a little gas a d held it for a sec. Im really praying it's a injector. They will be here tomorrow and I'll change it out and report back asap. Thank you kind people.

 

ok for a update. Fuel injector did not fix the issue at all.
so while I was messing around I decided to test the new Coil with a plug and it worked. I then tested all coils and all worked. I then started the jag and one by one pulled off each plug from each Coil on drivers side. And when I did engine did not change at all. I would unplug one plug it back in and go to the next. So im reallllllllllly not liking what some have said already. Time jump? I'm hearing a odd noise but it's ever so faint. I'm not scared to jump into the timing but I read a long post of a fella that it took 32 hours with not much knowledge to do saying he needed a few special tools. If anyone can chime in I'm alllll ears and eyes. So odd that the whole bank do t change when a Coil is unplugged. Never seen this.

 

Ah, you have discovered a little gotcha when troubleshooting a computer-controlled engine. The computer works very hard to maintain a stable idle speed. If you do anything to change how the engine is running (disable a coil, spray ether into a vacuum leak, etc.), the computer instantly adjusts fuel trim for a consistent idle.

On an engine without computer control, disabling a good coil will drop the idle speed. But in your situation, you have to watch the fuel trim trim to see how the engine reacts.

 

Hey all, i am looking for a chain kit is this the one im needing.
It does not need to include a water pump and gaskets i am going to purchase all that separately so i can make sure i get the metal upgraded pump and all top quality gaskets. I am about to check the compression and this should be my sure way of telli g if my exhaust valves are ipening before they should. Which i kinda think that are the more i think about this. If there is anything i should add to this job while im in there please please let me know. Again I have a 2000 jaguar stype 4.0. I have seen so many diffrent brands and diffrent kits my eyes are going crazy because they all look the same but the price ranges rather much. Thanks guys so much for the reply. I'll report back with the compression test results

 

Ok guys so I did compression test on the driver side all 4 went too 130 140 and immediately started dropping fast open exhaust Ports caused by jumping a tooth on exhaust side? Any info or advice? Car ran amazing before this happend.

 

Yeah, in the immortal words of Douglas Adams (look it up):

"Don't Panic"

Does your compression gauge have a little button to release pressure? If so, that means it also has a check valve to hold the highest pressure recorded. Because your gauge is dropping immediately, that makes me think it does not have the check valve. It's normal for pressure inside the cylinder to drop off fairly quickly. How fast? Can't tell you. But consider the layout of the piston rings, for example. Even when sealing properly, each ring has a gap. The gaps are staggered to slow the leak rate, but they still leak. And when the engine is cold, the gaps and corresponding leak rate are greater.

Whatever is going on with your engine, it seems your test equipment may be steering you in the wrong direction. The numbers you recorded are probably okay, but the behavior of the gauge (no check valve?) is scaring the bejeesus out of you. Before convincing myself the chain had jumped, I'd investigate how to confirm the cams are still properly timed relative to the crankshaft. Don't know the details, but there must be some way to physically check. Hopefully somebody else can chime in.

 

Read the other bank.

 

Thanks for the reply. Yes my guage does have the release button. I've even listened for a Leak and no air is escaping. I just can wrap my head around this issue. I am all over the place lol. It's just so odd and especially the way it happend has me stumped. To just happen all the sudden after I start it just throws me all off. I'm a fairly decent mechanic I have been since a child. But this engine has me for a loop. Can I post a video on the fourm? Or should I upload one to YouTube? I can make one with the guage to show just how fast it goes down and then reinstall everything and let it run. Like I said I am open to any type of help someone can give me. This car is way to nice to get rid of and I most certainly will not do so. The wife and I have wanted a car we can get out and enjoy as she drives a new pacifica that's sitting on some srt rep 22's that she has made her soccer mom mobile but she really likes this stype and wants it going asap lol. You know little off topic but isn't it funny how we men get something then the wife over takes it.... it keeps happening more and more haha sorry small vent. Ok back on topic. Another odd thing if I give it a little gas while running it smooths out a lot and actually seems to run ok until I let off then it's rough and not so happy any more. I honestly don't think it's timing but I just don't know. Just seems like it wouldn't run at all or would run way way worse if it was timing and I think I would get more then just misfire number 7 and a lean code.

Thoughts anyone???

Joe

 

Try your compression gauge on another vehicle. See if you get the same rapid leak down. That would help isolate if your compression gauge is misbehaving.

 

Even better going to buy a new one as we speak. Gimme 30ish mins I will reply. Thanks much

 

Ok so the guage I had is trash. All cylenders are good 135 to 140 and holding. Hmmmm now my head hurts.