Alright, So what can I do? I have to do the wash method EVERY morning now for this car to start! Pedal to the floor, yada yada.

Could this possibly be fuel injectors leaking over night causing the wash issue? Once it's running and all in sync and working after warming up doing the wash crap, Its smooth and quiet as can be! Amazingly smooth really.

What more can I do? I've read about Restore for 8 cylinders that it works well helping on this issue. Is it worth a buy?

I really love this car, I can't just let this motor go to the grave! As I said it runs and drives too good for it to be a major issue. NO codes, and only 76k miles!

Any one have a solution?

 

It may not be the bore wash. You should do a scan to see if any sensor etc. has perhaps failed. For example, with a bad camshaft sensor the engine will still run very well but the starting will be difficult. Before the scan, you can try the following: switch the ignition "on" and leave it there for some 40-45 sec. before turning the key further to "start". If the engine starts fine every time with this method, it would mean that you possibly have a bad cam sensor.

 

Had scans and everything! Zero codes. It's the bore wash, Every time. I have to do the pedal method then barely get it going, then it smooths out after a good 10 minutes, and bam, Running amazingly.

 

You're not forced to get a code for a bad sensor...

 

Some scanners do not detect all sensor faults (Icarsoft i930 for example). You should do a scan with a proper Jaguar scan tool.

 

Can you give us the year and model please? Putting it in your signature will help to not have to state it each time.
The bore wash issue is susceptible to just a few model years, so this could help direct us.
Do a compression test.
Now...when was the last time the fuel filter was changed?
Have you checked the air filter for blockage and when was it last changed?
Be sure to check the cross ventilation tube from the cam cover to intake tube for blockage.
Do you have an oily residue in your throttle body?
Have you checked the condition of your plugs (are they the correct ones?) and checked the gap? You should get 100k + out of iridium's, but it doesn't hurt to check.
...it could be the CPS (crank positioning sensor), ...either simply dirty or going bad or a bad connection?

 

True. (But, as posted, there are also conditions which do not flag codes.)

 

1998 XJ8 4.0

Everything you guys have stated has been checked up! This car is clean. It's been scanned at both autozone, O-Reilly, And Advance auto to be sure. All connections are spotless, No residues or anything out of the ordinary.

It's bore wash...

I just wanted to know if there was a remedy to help it at this point. I've read up on some stuff called "Restore" for 8 cylinders.

EDIT:

It really seems like I have possible leaking injectors? As over night fuel may seep back in and wash away the oil?
Its the only thing that makes sense at this point. I have to do this method every day!

I had an idea. I'm going to drive the car all day as usual, And before I call it a day, I'm going to undo the injector system and leave it all unhooked and so on.

Then, In the morning redo it all and see if it has the issue still. What you guys think?

 

If it's a leaky injector it'll make no difference.

It's probably not a leaky injector as you'd need lots to leak.

 

What else could it be then? As stated, I gotta do the WOT method every time, Pedal to the floor and crank it or the oil method with the plugs out.

It has to be the injectors leaking. I could leave it sitting for hours and its fine, But leave it for a full half day til the next morning, Bam! -_-

 

Might I add, This car DID sit for 4 years before I bought it. But, As i mentioned, Everything has been checked and gone through and the only thing I had to buy was a new Security Module. The old one was worn out, Moisture.

Wiring is clean and every harness I've checked on is near mint. Fuel filters solid, New fuel pump too, working as it should every time, Clean tank, Clean lines.

Could it also be the fuel mixture though maybe? I did buy a bottle of HEET to run through it being it sat for so long. I do remember it starting just fine with the new pump the first few times before HEET was added. Despite it did help clean things very very well, Could that really be the issue here?

 

Maybe.

It sounds more plausible than (most of) 8 injectors all leaking.

 

Actually, Think I found the problem! Where it sat for some time, The oil despite looking super clean (and was), I did find that it seemed to be a little thin now. And sort of low, Not entirely low to the point of alarming, Just a 'Meh' low. lol

Now, The thin oil. Doesn't that seem possible? As I mentioned how it sat for 4 years. The oil filter is clean though, It has pressure too.

But does seem like its not getting oil in the cylinders as it should on first fire, That is a bit thin too. So, Would thin oil cause this? As it settles over night, Makes sense.

 

We put oil in the cylinder, Just 2 not all 4, And it fired up without a problem instantly. And as I said above, The oil does seem very thin like compared to what I'm used to.

 

Oil is oil, if you put in the specified 10/30 you should be good.
If your putting oil in a cylinder to get it started, I suspect low cylinder compression. What about the compression check?

 

Haven't did a compression test yet. But as I stated, It runs and drives like new. It's the bore wash issue. But the oil in it being as old and as long as it sat, Has me curious. It is rather super thin so it seems. As it seems it takes more than just a few WOT cranks to get it going like it isn't tossing oil around enough. The oil does have a slight gas scent on the stick, What do you think?

 

I think you may have a possible piston ring issue, but until you do a compression test I'm out.

 

I have no tools to test compression and can't drive it right now in town all over, Just back roads and such atm. Not tagged until I sort this out. I've only had this car for about half a month now.

The piston ring issue would be a little more obvious though wouldn't it? I've seen it on other motors and its nothing like it, I've witnessed it on BMW's with the m60 and all sorts of other cars that also had this kind of lined block. I was told it could possibly have gummed up gas on the rings though and need a proper cleaning.

But its so odd. It hasn't jumped time, runs smoothly, drives crazy good, Idles around what I can tell I'm guessing 650-750 range, doesn't hesitate or jump around, And no over heating, Everything works as it should.

No noises either besides when I first start it, You can hear what sounds like its low on oil or its just thin oil or not being pushed around properly. The light ticking clears up after a good 5-10 minutes upon first start of the day. After, It's perfectly fine all day and you literally wont notice it even running! That's legit how smooth and quiet it is.

Why it keeps bore washing, I'll never know. I'm thinking oil though, Really. It's thinned out, And kind of does have a light gas scent to it.

I'm going to change oil and add some of the Restore to the motor and see what I can do.

I've literally checked everything but the compression as I said, No way to do so yet.

 

As you strongly suspect bore wash and since you found the oil to be very thin (what grade is it?), use 10w30 or 10w40 oil for the change. Many modern oils come as 0w30 or 0w40 but I think they are too thin when cold for the Jag engine.

In general, the advice is not to use any oil additives. I suggest you try with the 10w... oil first and, if no improvement, try with adding Restore.

 

I think Autozone or O'reilly's loans that tool? You can find it at Harbor Freight also, I'm pretty sure.