Hi all,
I would like some opinion on the below if possible please:

I have a 1999 Xj8 X308 with 103,000miles that has stood dry stored for at least 4 years.
New fuel pump got her running and fault codes indicated a bad coil (which I replaced) and various MAF and O2 sensor related issues:

P0102 mass air flow circuit

P0112 intake air temp sensor 1

P0352 ignition coil B primary/secondary circuit

P1646 heated oxygen sensor control module Bank 1 open/shorted

P1647 as above bank 2

I decided to check the tensioner situation before embarking on a spending spree and found a huge chunk of plastic sitting next to the timing chain. These appear to be Version 1 tensioners which I’ll replace if it seems viable (See photo).
The engine ran beautifully for about 10 mins after firing up for the first time, then went into limp mode which was resolved by the replacement coil. Subsequently however, I seem to have lumpy running and a knocking from what seems to be lower in the engine and limp
mode back on.
I’m assuming the lumpy running could be the MAF issues but would this cause that kind of noise? Is it likely that the tensioners have deposited lumps into the engine and it’s now buggered? I’ll check the timing across the cams to make sure the chain hasn’t jumped.
I also have white deposits under the drivers side cam cover (other not removed yet), could this just be condensation (no heavy white smoke from exhaust) and it needs a good run to clear?

Thanks for any input.
Rob

Milky deposits... condensation or HG?

Tensioner



Lump of plastic by timing chain.

 

Looks like both primary and secondary tensioners need replacement. I would guess you also have some plastic junk in the sump, as well.

 

Agreed Jim, but to answer the original question, probably condensation. Too many short trips.

 

 

Secondary tensioners, too.

 

HI robbird10.
These guys know there Ship.
they helped me and I'm absolutely sure they can help you with any questions along the way.


jay

 

Agree the white looks like condensation.

FWIW if/when you do the tensioner replacement, don't forget the guide rails. When I did mine many years ago the quide rails were in worse shape than the tensioners.

 

that’s perfectly serviceable

broken bolt hole is a problem

 

Check here...

02 jag xj8 jack stand points

it was a Journey, started with looking for safe place for Jack stands. The guys here talked,walked me thought it.
everything looks worse then it is when you do that know something.
happy to say the engine is Very Happy now.