1989 xj6 3.6L

I can not get the idle down to a reasonable level. 700 - 800 rpm


throttle is set at .002

TPS is at .300 volt

when i Pinch off the breather hose i can manipulate the idle and even stall the engine.

i have also checked for secondary fuel.

what is going on??

 

sounds like you have a XJ-40, not a XJ-6, although every Jaguar sedan is called a XJ-6.

this forum is for the XJ-6 from 1968 to 1987.

try the XJ-40 forum, look for it at the top of the page where it says "FORUMS".

 

Hi Jose . . . I too, see and try to respond to this continuing misunderstanding of XJ6 and XJ40. So, can I help extend the understanding a bit . . . even if I might sound a bit pedantic.

For the 6cyl Series I, II, and III that finished in 1987 (XJ12 continued, but irrelevant here), Jaguar produced cars listed and badged as XJ6. However, unlike today's markets where manufacturers vie for how many brand, model and variant badges they can fit onto each new car, there is some evidence that Jaguar, while preserving their brand badging, wanted to focus more on the posh value of the premium variants.

From 1988 to 1994, Jaguar produced cars listed as XJ40 (incorrectly known by some as a Series IV XJ6), but badging was varied . . . "XJ6" became badging for the base variant; "Sovereign" badging for superior variant; and "Vanden Plas" badging reserved for the premium variant. Line up a large number of similar year but different variant XJ40s and observe the rear panel badging . . . "XJ6" will dominate, but disappear if a "Sovereign" or "Vanden Plas".

None of this cuts any ice with vehicle registration authorities to whom all these cars are simply grouped as "XJ6". No wonder new owners of these cars are confused.

Cheers,

Ken

 

Hi Ken,

true there isn't such a thing as "Series 4", I think the "series" thing stopped with the Series 3 XJ-6 and Series 3 XK-E.

but it sure helps me and some others to call the XJ-40 a "Series 4", if only to classify the models in these forums, since as you say, the vehicle registration authorities see all Jaguar Sedans as "XJ-6". It really is not the car owners' fault that they end up in this forum.

 

I'm reminded of the days....1980s-90s.... when Oldsmobile took advantage of the ever-popular "Cutlass" name and applied it to several very different cars simultaneously. Cutlass Supreme (W-body platform), Cutlass Calais (N-body platform) and Cutlass Classic (G-body platform).

Cheers
DD

 

Further complicating the confusion is that many parts vendors (and otherwise knowledgeable Jag enthusiasts) think 1986 marked the end of the Series III XJ6. They don't acknowledge that the Series III XJ6 production continued on well into 1987 calendar year, April to be specific.

Cheers
DD

 

not to mention that in these forums, the 420 (1966-1968) is not even included, the shortest production Jaguar ever.

a very interesting car if you've ever driven one, it's essentially an S type (Small Saloon) but with a 4.2 liter carbed XK engine and different front grille/nose. It also has a Dash that established the XJ-6 dash style from 1968 until 1987 / 1992 V12 S3.

 

Hi Jose,

My skin crawls when, every few days, I pass a 420 here that looks like it was modded in the witching hours of darkest winter by Cousin It of the Adams Family. Matt dark graphite in colour, lowered suspension, a wide muti-port airscoop protruding up through bonnet/hood, flared guards barely enfolding very wide custom wheels and wide, low profile rubber. I find myself cringing as I pass by, wondering if it is haunted by its original owner.

Cheers,

Ken

 

haha! don't blame the car, blame the owner!! The 420 is not the best looking Jaguar, at least the front isn't, but it is a Jaguar and a rare one.