Question about 1985 Jaguar XJ6

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Chuging jag my 1985 4.2 xj6 is not getting full power, it chugs along, sounds like a sick v8, changed the plugs and leads, but made no difference

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Change the air flow meter.

Posted on Jul 24, 2009


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Heater does not work on my 1985 jag

put a radiator flush in your expansion bottle run it for about 20 miles to clean out both the core of the radiator and your heater core .then drain it. refill with 50/50 mix of anti freeze. leave off the cap the now as you need to bleed it first. to do so .put your heating on full with the engine ticking over .the water starting to heat up put on your cap.

Dec 11, 2013 | 1985 Jaguar XJ6

2 Answers


Hi it's me rosemary2729 with a solution.
Firstly I took the car to a garage who said that they could change the plugs + air filter + fuel filter + oil etc. and if that didn't work could then try other things until they solved it. This sounded like a ticket to print money. I then decided to get a man who comes to the house and who carried out one of these diagnostic checks. He said it was the lambda sensor which is at the engine side of the catalytic convertor on the exhaust. Of course, the lambda sensor on this car model was not of the standard cheap type. The diagnostic man said about £300. On ebay I got one for £62. All internet instructions said a 15 minute job. However to save my husband of having to struggle under the car got a garage to do the job, which took 10 mins and cost £10. Car now runs like a dream, no flat spot and no chugging.

Apr 04, 2009 | 2001 Toyota Corolla

3 Answers

1984 jag xj6 has no power

Hi Clyde

Expect you have it running by now, as I see this was posted 2 March ?

If not......

Charge up your battery, and heavy discharge test, suspect you have short in the plates.

If OK, jump start with a set of proper heavy duty jump leads.

Good Luck !

A FixYa would be nice...Thank´s......John.

Mar 03, 2009 | 1988 Jaguar XJ6

1 Answer

Car started chuging when started ,

it sounds like you got some bad gas, fuel filter is plugged or it is out of time

Jan 29, 2009 | 2005 Ford Escape

1 Answer

My jag runs ok on idle and misfires under load

do a compression test ?? about 180lbs anything less and it could need a valve regrind ,if compression seems ok then plugs and leads and use the bosch plugs with the 3 electrodes (for voltswagon) champion are **** and missfire.if still persists change dist cap and leads

Jan 17, 2009 | 1988 Jaguar XJ6

1 Answer

Why is it chugging?

When was last tune-up, plugs, wires etc?

Nov 23, 2008 | 1988 Dodge Ram 50

1 Answer

95 jaguar xj6 cuts out

sounds like valves not seating,this model car suffers from burnt valves as the engine was designed pre war when they had high octane fuel and lots of lead in the fuel ,lead lubricates the exhaust valves as well as causing all other health problems.but iam sure that these engines never got a stelite coated valves and valve seats when in 92 we all went unleaded.i have reground no end of heads since word got around that i could do a jag.i can get the head off in about an hour ,they are quite simple really just dammed heavy and the head gaskets expensive about 100€ another 3/4 hours to grind valves in then refit.valve timing marks on rear of cams by the way .

Nov 18, 2008 | 1995 Jaguar XJ6

1 Answer

Jaguar xj6 1991 2.9 manual

2 things, first of all teh distributor cap and rotor go bad causing the car to have spark but not fire, secondly you need to make sure that you are getting fuel to the engine bay, if not then it could be the fuel pump.

In regard to the other gentlemans question, starts but cuts out I would start with the same process and open your fuel flap and make sure there is no water around the filler area as it sounds like you could also have water in your gas. (there is a drain next to the filler neck and it gets clogged over time, then when it rains or you wash your wash, that area fills with water and seeps into the tank)

Jul 05, 2008 | 1991 Jaguar XJ6

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