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Re: the exhaust pipes are very sooty and the mpg is
Most likely bad o2 sensors but you should have the engine management light on. If you have get the code read, then look it up on http//:www.bluejag.co.uk
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I'm not familiar with a code that is s701, typical engine cades start with P. However, jag had a mfr recall numbered S701 on 98-99 xj models. What year and engine is your jag? Also try these links http://www.jaguarforums.com/forum/s-type-s-type-r-supercharged-v8-x200-15/s-type-check-engine-codes-61719/. http://www.obd-codes.com/trouble_codes/jaguar/. JAGUAR S701 1672 V 3/1/2002 1998 XJ series, WJCXV04.0AS3 A number of owners of 1998 through 1999 model year Jaguar XJR vehicles, 1983 50S 4444 1999 XK series XJCXV04.0AS3 equipped with an exhaust gas recirculation system, have been alerted to the 2461 50S presence of a possible problem by the sound of an exhaust leak and/or illumination of the MIL. It was established that the noise was being caused by exhaust gas escaping from the pipe that transfers exhaust gas from the exhaust manifold to the EGR valve. The escape was caused by a crack in the transfer pipe. Remedy: The design of the convolutions that provide for flexibility of the transfer pipe has been modified to improve the pipe's resistance to damage during installation and due to vibration. A heat sock has been added to provide a vibration damping medium for the pipe. Technical Service Bulletin S701 describes corrective action. Hope this helps
injector ,fuel feed disruption, turbo, is it smoking badly if so check sensors and turbo had the same problem car feels like its choking its self problem was split hose pipe on the turbo, you will need diagnostic read out to check sensors
Car may be running rich. If the car is getting normal mpg, I would not worry. The codes that indicate poor converter efficiency indicate the converter is wearing out. If that code keeps coming back, replace the converter. If it is getting poor mpg, I would look for something causing rich operation. Possibly a broken fuel pressure regulator or maybe a bad map sensor. Continued rich operation will cause the converter to fail prematurely.
first thing to try is redexe fuel injector cleaner at 1 can to 1/2 tank diesel,then see if you need to anything else.......(start with the cheapest solution first..)
CODE P1313 MISFIRE CATALYST DAMAGE BANK 1 CODE P1314 MISFIRE CATALYST DAMAGE BANK 2 COULD BE MANY THINGS THAT CAUSE THAT PROBLEM.FAULTY EGR VALVE FAULTY MASS AIR FLOW SENSOR OR BAD COOLANT SENSOR BAD O2 SENSORS.LEAKING INTAKE MANIFOLD LEAKING EXHAUST PIPE OR EXHAUST MANIFOLD.
I had a similar problem with my ford 1/2 ton pulling a trailer on a grade against the wind on hot day. thought I completely fried the tranny. Let it cool off, continued the trip and drove the truck for years with no more problems. Can't explain how your dip stick was dry however. The dipstick should have been wet with foamed trans oil.
front pump seal is leaking or oil pan seal is leaking and hitting the exhaust pipe. time for a transmisson oil change and fliter replacement. costs about $200.00 at any tranny shop.
i had this problem and thought the fuel filter oil filter needed replacing so i have just had a service done but problem is still there but not as bad. been told it could be the AGR valve or a split pipe going to it which recuirculates unused fuel back to burn again. therefore unspent fuel is coming out of the exhaust causing the black smoke. i am still looking for the answer aswell, hope this helps.
ITS MORE THAN LIKELY ITS A SENSOR NOT JUST THE O2 SENSOR, MOST NEWER VEHICLES HEAVILY RELY ON INFORMATION FROM THE EXHAUST SO THE THE COMPUTER CAN AJUST THE SETTINGS FOR FUEL REGULATION, U CAN CHANGE MOST OF THE SENSOR ASSOCIATED WITH THE EXHAUST SYSTEM WHICH MAYBE 2 OR 3. THE EASIEST WAY AND MOST COST EFFECTIVE IS TO GET A DIAGNOSTIC OF THE BAD SENSORS THEN DECIDE ON THE BEST METHOD OF REAPIR
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