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Jaguar engine repair questions and answers

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  • ShawnPM
    ShawnPM - 2006 Jaguar S-Type - Engine - 8/29/2014
    A/C blowing hot air!!
    Dearest Auto MD, I have a 2006 Jag S-Type. My A/C does not blow cold air all the time. It will blow hot air mostly and then after a while sometimes it will begin to blow cold again. I have noticed that when the car has been sitting (turned off) in hot sun and I ...
     
    • ShawnPM
      8/29/2014 ShawnPM
      Dearest Auto MD,
      I have a 2006 Jag S-Type. My A/C does not blow cold air all the time. It will blow hot air mostly and then after a while sometimes it will begin to blow cold again. I have noticed that when the car has been sitting (turned off) in hot sun and I jump in, it usually will not ever get cold. Sometimes in that scenario it will kick out cold air after about 20 minutes. When the temperature outside is hot it usually doesn't work. However in the cool mornings when the temp is below about 72 and the car is sitting at idle after 10-20 minutes it will start getting cold air again. When I get cold air and don't turn the car off I maintain the cold air. So I have an intermittent problem.

      I have had it in the shop numerous times. First they recycled the refrigerant and made sure it was pure and at the proper capacity. No change. Then they replaced a high pressure switch. Still no change. Now they are telling me that they will have to dig into it deeper. Please help as they seem to just be guessing!

      I had it in a couple (about 3.5) years ago for about the same problem (memory kind of foggy). They ended up replacing two items that seemed to fix it. I am guessing on these part names and descriptions but hear I go. Part one was like a small black box about the size of two packs of cigarettes laying on top of one another. It seems to me that this box had some kind of electronics and was called something like a temperature control box or module. The second part was a much larger almost octopus looking item. It seemed to be a black plastic blow molded venting mechanism with some sort of air flaps. Both these items were spendy.

      Please help your assistance would be greatly appreciated.
      Sincerely,

      Dearest Auto MD,
      I have a 2006 Jag S-Type. My A/C does not blow cold air all the time. It will blow hot air mostly and then after a while sometimes it will begin to blow cold again. I have noticed that when the car has been sitting (turned off) in hot sun and I jump in, it usually will not ever get cold. Sometimes in that scenario it will kick out cold air after about 20 minutes. When the temperature outside is hot it usually doesn't work. However in the cool mornings when the temp is below about 72 and the car is sitting at idle after 10-20 minutes it will start getting cold air again. When I get cold air and don't turn the car off I maintain the cold air. So I have an intermittent problem.

      I have had it in the shop numerous times. First they recycled the refrigerant and made sure it was pure and at the proper capacity. No change. Then they replaced a high pressure switch. Still no change. Now they are telling me that they will have to dig into it deeper. Please help as they seem to just be guessing!

      I had it in a couple (about 3.5) years ago for about the same problem (memory kind of foggy). They ended up replacing two items that seemed to fix it. I am guessing on these part names and descriptions but hear I go. Part one was like a small black box about the size of two packs of cigarettes laying on top of one another. It seems to me that this box had some kind of electronics and was called something like a temperature control box or module. The second part was a much larger almost octopus looking item. It seemed to be a black plastic blow molded venting mechanism with some sort of air flaps. Both these items were spendy.

      Please help your assistance would be greatly appreciated.
      Sincerely,

      Dearest Auto MD,
      I have a 2006 Jag S-Type. My A/C does not blow cold air all the time. It will blow hot air mostly and then after a while sometimes it will begin to blow cold again. I have noticed that when the car has been sitting (turned off) in hot sun and I jump in, it usually will not ever get cold. Sometimes in that scenario it will kick out cold air after about 20 minutes. When the temperature outside is hot it usually doesn't work. However in the cool mornings when the temp is below about 72 and the car is sitting at idle after 10-20 minutes it will start getting cold air again. When I get cold air and don't turn the car off I maintain the cold air. So I have an intermittent problem.

      I have had it in the shop numerous times. First they recycled the refrigerant and made sure it was pure and at the proper capacity. No change. Then they replaced a high pressure switch. Still no change. Now they are telling me that they will have to dig into it deeper. Please help as they seem to just be guessing!

      I had it in a couple (about 3.5) years ago for about the same problem (memory kind of foggy). They ended up replacing two items that seemed to fix it. I am guessing on these part names and descriptions but hear I go. Part one was like a small black box about the size of two packs of cigarettes laying on top of one another. It seems to me that this box had some kind of electronics and was called something like a temperature control box or module. The second part was a much larger almost octopus lookin
  • ShawnPM
    ShawnPM - 2006 Jaguar S-Type - Engine - 8/29/2014
    A/C Blowing Hot Air!!!!!
    Dearest Auto MD, I have a 2006 Jag S-Type. My A/C does not blow cold air all the time. It will blow hot air mostly and then after a while sometimes it will begin to blow cold again. I have noticed that when the car has been sitting (turned off) in hot sun and I ...
     
    0 answer
  • Charles Larmond
    Charles Larmond - 1999 Jaguar XJ8 - Engine - 8/24/2014
    Engine has no power when gas applied
    was on the road got home about 30 m later went to bring the car into the garage start it up applied gas no power but engine still runs no check engine light check with obd reader the code is P0506 and P1111
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2001 Jaguar S-Type - Engine - 7/17/2014
    Why does the car start in the am but after driving it for a little while ,I then stop for a few minutes and it does not
    mileage:205 000.,this happens anytime but mostly after stopping for a little while.only happens after stopping.it occurs all the time.it started a year ago.no lights are on only a beeping sound
     
    0 answer
  • AutoMD Member
    AutoMD Member - 1995 Jaguar XJ6 - Engine - 6/29/2014
    How much pressure should the fuel pump have?
    The engine runs sluggish and does not idle smoothly
     
    • jdl
      6/29/2014 jdl
      My info says 43 psi non-turbo. With turbo, add about 10 psi.
      jdl
      6/30/2014 AutoMD Member
      I purchase a pump that is supposed to be the correct pump this vehicle that is 70 to 90 psi. Your information says 43 psi non-turbo. Please help, i don't understand. Thanks
      jdl
      6/30/2014 AutoMD Member
      The information on this vehicle is fuel pressure at idle, vacuum hose attached, vacuum hose detached, fuel system hold pressure, and fuel pressure maximum
      jdl
      7/1/2014 jdl
      All I can tell you is what my database showed. I even looked up the fuel pump in an online partsbook, it said 43.5 psi. When I check fuel pressure, I check with key on engine off. Depending on how much vacuum is applied to the pressure regulator, the pressure can vary between 35--45 psi, according to my database.

      You could talk to the service department at your local dealership, see if they can give you all the specs you need?
      jdl
      7/1/2014 AutoMD Member
      Thank you very much for the information
  • AutoMD Member
    AutoMD Member - 2006 Jaguar X-Type - Engine - 6/20/2014
    Fan wont stop running while shut off radiator
    just started yesterday after short trip less than a mile
     
    0 answer
  • AutoMD Member
    AutoMD Member - 1986 Jaguar XJ6 - Engine - 6/14/2014
    No spark at all ( not at coil , plugs ,distributor or anywhere ) what can I do to correct the problem
    Car has 170000 miles car was running before , died on me one day and it would not start up again check it out find out no spark , have power at coil ???
     
    0 answer
  • AutoMD Member
    AutoMD Member - 1988 Jaguar XJS - Engine - 6/8/2014
    Why does temperature gauge go to highest level (H) after only 5 miles of driving
    New water pump installed only ten days and ten miles ago
     
    0 answer
  • AutoMD Member
    AutoMD Member - 1988 Jaguar XJS - Engine - 6/8/2014
    Engine coolant temperature gauge goes to highest level (H) after 5 miles of driving.Why??
    This is first time driving car after new water pump was installed. Is it a faulty gauge, sensor, or more serious problem??
     
    0 answer
  • AutoMD Member
    AutoMD Member - 1988 Jaguar XJS - Engine - 6/8/2014
    Engine coolant temperature gauge goes to highest level (H) after 5 miles of driving.Why??
    This is first time driving car after new water pump was installed. Is it a faulty gauge, sensor, or more serious problem??
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2003 Jaguar S-Type - Engine - 5/21/2014
    I started slowing down when driving and the engine starts to sputter until i stop. no there was no error message.
    when I restart the engine idels well and I can resume my journey until the problem starts again.
     
    0 answer
  • AutoMD Member
    AutoMD Member - 1980 Jaguar XJ6 - Engine - 5/11/2014
    My engine backfires alot
    on slow acceleration, or going up a hill
     
    • Jimm
      5/11/2014 Jimm
      Most likely the issue is engine timing-related; such as worn / streched timing chain or faulty tensioner. How many miles are on the vehicle and in particular - the engine?

      For your vehicle to run effectively, there are a number of parts in your engine that need to be in proper working order. A couple of these include the timing chain and the timing chain tensioner. The timing chain tensioner is what makes sure that the timing chain is in consistent, efficient working order at all times. The timing chain tensioner also stands to put tension on the timing chain. If the timing chain slipped from the tensioner being damaged or excessively worn - then it would cause the motor to be out of time, which would then lead to backfire, be hard to start and possibly not even run at all. In addition, if it isn't working properly due to wear and tear or other damaging issues, it the systems of chains and gears, which connect the timing chain to the camshaft or crankshaft won't work efficiently. Now, in order to tell if your timing chain tensioner is bad you aren't just going to remove it and have a look. It is one of the most difficult pieces to remove under the hood and isn't on the top of anyone's list to just remove and see if it's okay or if it's worn.

      Therefore, you must have good ears and listen for a few problems that may occur when the timing chain tensioner is cracked, worn, or torn for some reason. Listen to see if you hear a rattling noise when you start the vehicle or even accelerate as this could mean that there is no much tension placed on the tensioner pulley or that it is possibly cracked. Sometimes the tensioner can leak oil onto the camshaft or crankshaft from being cracked so oil leaks are a good thing to be on the lookout for. When changing gears, listen for a squeak or screech as this could mean the tensioner is under too much pressure. The tensioner could be worn and needs to be replaced.

      There are other possibilities; faulty spark plugs, faulty spark plug wires, low / poor fuel pressure, clogged fuel filter.
  • AutoMD Member
    AutoMD Member - 2005 Jaguar X-Type - Engine - 4/15/2014
    Looking for best performance chip
    can anyone steer me in the direction of a performance chip that will give me maximum mpg and horsepower. please respond if you are certain of the chips performance and reliability.
     
    0 answer
  • William Rigdon
    William Rigdon - 1982 Jaguar XJS - Engine - 4/12/2014
    Intermittent problem with no electrical to the starter when turning on the ignition
    Approx. 90,000 Kilometers (Canadian import). Replaced the starter relay with new, no change. Car starts properly on about 8 out of 10 attempts. Does not seem to make any difference if it is cold or hot or if it has just been driven or not. I drive the car about ...
     
    • alex
      4/12/2014 alex
      it can be bypassed but stock is always better. you will need a second person take a voltmeter go to the small post of starter solenoid and ground. have a friend bump the starer you should have 12 volts on the post every time. that post is where you would wire a push button to bypass key start. if you are missing power have your friend wiggle the shiftier if this makes it go you have a problem with your neutral safety switch the switch should be adjusted or replaced. if it doesn't find your starter relay. check for power on post 30 of the relay if you have power every time and it doesn't start its the relay. i am pretty certain you will find it's in your neutral safety switch.
  • AutoMD Member
    AutoMD Member - 1999 Jaguar S-Type - Engine - 4/10/2014
    My relays stays on in the trunk fuse panel when the ignition is totally shut off I'd be gratefull for any diagnoses
    All tips would be great I'm been a mechanic for a very long time but this one stumped me so any or all suggestions would benefit Thankyou
     
    • HouseCallAuto
      4/9/2014 HouseCallAuto
      Which relays are staying on if you can id them? You did not say but i assume that the battery is going dead because of this?
      HouseCallAuto
      4/11/2014 AutoMD Member
      Power switch 1 , 2 , 3 , 4 pls direct me lol thanks
    • AutoMD Member
      4/10/2014 AutoMD Member
      There are five in a row two outer ones four they are the same power controls 1,2 3and 4 staying on when ignition is off I'll pull the relay and they all go click so something is powering them up when car is off I don't know if it would be ignition or alarm or a short in the system really hard to isolate thanks
    • AutoMD Member
      4/10/2014 AutoMD Member
      The four relays are the switched power relay 1 2,3and four think I put the question in the rt spot lol staying on when ignition is off thank you for any insight