I bought the car with a passion for Jaguars but can't really afford to run the cat. I'm hoping the misfire is something that can be fixed with a little advice. Being a petroholic, the Jag doesn't get much use, so after a week of being cold, she takes about 15 minutes of running to be rid of the misfire. The sound of the misfire is only slightly 'lumpy' so maybe there are even eleven cylinders firing. The London freeze isn't helping things! Please help !!!!!!!!!!!!
2006-12-23 10:49:44 · 12 answers · asked by Ad Cas 2 in Cars & Transportation ➔ Maintenance & Repairs
Back in the days when i worked for a jaguar dealer we had this a few times and we had a procedure we followed to cure this forst we would replace the plugs leads and cap as a matter of course, this cures it 99% of the time the other thing is that on this injection system it relies on water using a fasd unit (fully automatic starting device) this is a bi metalic strip that allows extra fuel to be sent to the cold start injector which acts a bit like a choke mechanism to check all this you need to find a dealer that still has the epitest equipment which would be rare theses days unless you can find an independant jag specialist, hope this helps
2006-12-24 06:07:52 · answer #1 · answered by gav552001 5 · 0⤊ 0⤋
It could be dampness getting around your plug wires. Lift the hood at night when it is running rough and look for sparks around the plug wires. They often leak near their boots or where they cross. It could also be a bad fuel mixture from a leaky vacuum hose, or a bad air filter. One way that I have used to check for damp wires is a product called W-D40. I don't know if you have it by that name. It is a silicone lube spray that displaces water. It is nonconductive. If it is moisture on the outside of the plug wires spraying with W-D 40 will get rid of the moisture. If that ends the problem then you know it is from the wires. Another simple check is to inspect the plugs. If they are dirty or worn that might be the problem. plugs are fairly cheap to replace.
The fact that you mention the chilly weather makes me think it is moisture condensing on the wiring.
2006-12-23 11:17:57 · answer #2 · answered by Barabas 5 · 0⤊ 0⤋
Engine oil flush and change the filter. Check the HT leads, cap and rotor arm. Then go onto the fuel system checking for fuel leaks etc..
This time of year is no good for any car. If in doubt get it checked out, you might save some money and fuel in the long run when it's running like that.
2006-12-23 13:23:49 · answer #3 · answered by Mark B 1 · 1⤊ 0⤋
the place is it saved while your no longer using it. if it has a miles less costly copper center radiator it has in all probability rotted out, if its best chum this is going to likely be ok. thermostat is oftentimes the offending merchandise and between the main commen motives for the top gaskets to pass interior the 1st place. can be the rad fan swap or the fan itself does the fan come on in any respect. it must be the water pump yet they are oftentimes exceedingly sturdy on the v12 jag engine and its toddler brother straight away 6 engine. once you run it for in straightforward terms a couple of minutes turn t off and launch the water header tank lid, be carefull, if it throws its water out this is definately in want of head gaskets if it basically releases a tiny little bit of rigidity then you certainly no thehead gaskets haven blown around the cylinders and is maximum possibly the thermostat, additionally while this is at temperature examine if the radiator is getting heat {dont positioned your palms close to the fan or you're able to lose one} despite if this is stone chilly then the two the pump isnt circulating the water or the thermostat isnt beginning to enable the nice and comfortable water out of the engine
2016-11-23 13:49:52 · answer #4 · answered by ? 4 · 0⤊ 0⤋
First check the timing, then the plugs and then the wires and then the fuel filter. All of these can cause a miss. The roar of the cat might be the timing if it is the V-12.
2006-12-23 11:04:36 · answer #5 · answered by ebay junkie 2 · 0⤊ 1⤋
probably needs a tune up you know new plug wires distributor cap ect and then perhaps also you are using to low an octane rating fuel for the jaguar and then maybe it has some water in the fuel as well.
2006-12-23 11:03:59 · answer #6 · answered by billc4u 7 · 0⤊ 0⤋
A lot of people on here have suggested nearly every thing you could check yourself without going to a garage, the other thing you could try is using injector cleaner for the fuel injection system in case you have clogged injectors it is very easy to use you just pour it in your tank when you fill up with petrol.
2006-12-23 22:01:56 · answer #7 · answered by delta9 3 · 0⤊ 0⤋
Buy new plug leads. I had one before and it ran rough as a badger 'til warm then it wasn't too bad. A good test is to remove them overnight and dry them on a radiator then use WD40 on them to expell any remaining damp. Refit and see if any improvement.
Plug leads deteriorate then soak up the damp and you'll never get them to return to their showroom-like efficiency without renewal.
If you're doing this but new plugs. To not do this is false economy.
2006-12-23 14:25:16 · answer #8 · answered by dave angel 2 · 0⤊ 0⤋
Take your dizzy cap off and clean contacts with a small piece of emery paper then wipe out with kitchen towel or tissue make sure you replace it properly and dry HT leads why your there
2006-12-23 13:29:25 · answer #9 · answered by kremmen001 3 · 0⤊ 0⤋
Could just need a tune up..... sounds like sparkplugs, does your car use a distributer cap?
2006-12-23 11:02:17 · answer #10 · answered by Anonymous · 0⤊ 1⤋