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Jaguar engine repair questions and answers

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  • 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
  • AutoMD Member
    AutoMD Member - 2003 Jaguar S-Type - Engine - 3/24/2014
    Idle too low it cuts off
    it started after I replaced the tps. Now the vehicle idIles too low when vehicle reaches hot temperature. I have too keep my foot on the accelerator.
     
    • Jimm
      3/24/2014 Jimm
      First step - have the stored fault codes or check engine light scanned - for free - at any local auto parts store; Advance Auto, Auto Zone, NAPA. Then, post a reply as 'add answer' with the specific code for more assistance. There may be a fault code stored in the OBD memory which may not be displayed as a check engine light.
  • AutoMD Member
    AutoMD Member - 2003 Jaguar S-Type - Engine - 3/23/2014
    After replacing tps my rpms are too lowIt
    the problem started after replacing the tps. now the vehicles idles too low after it gets hot. I have to keep my foot on the accelerator or it will cut off,
     
    • HouseCallAuto
      3/23/2014 HouseCallAuto
      You need a scan tool that can read data and fault codes. Why did you replace the tps? Did a fault code direct you to that or you just figured it would help by replacing it?
  • AutoMD Member
    AutoMD Member - 2000 Jaguar S-Type - Engine - 3/14/2014
    How do I charge my air conditioner?
    No other details necessary
     
    • HouseCallAuto
      3/14/2014 HouseCallAuto
      Buy a kit at the auto parts store and follow the instructions. Beyond that cannot be conveyed here safely. I do not endorse any DIY air conditioner recharges for non-professionals. can be dangerous.
  • AutoMD Member
    AutoMD Member - 2000 Jaguar Vanden Plas - Engine - 1/26/2014
    My car starts but has no compression on all 8 cylinders. What are the possible problems?
    Mileage 99,500. The car did run hot before this happened. I am hoping it is just a blown headgasket but even that issue should not cause it to have no compression in all the cylinders. Or am I wrong?
     
    • AutoMD Member
      1/25/2014 AutoMD Member
      Depending on how long it was run hot id say broken rings
    • John's Auto Repair
      1/26/2014 John's Auto Repair
      You may want to check that compression gauge. Engine can not run with no compression!
  • AutoMD Member
    AutoMD Member - 1996 Jaguar XJ6 - Engine - 1/2/2014
    Fan comes on too often car not over heating
    temp guage is just below N
     
    • John's Auto Repair
      How often is too often? After 30 minutes of running, the coolant fan should cycle on approxamently
      every 15 to 25 minutes. Have you checked the coolant level? Please forgive any miss-spelling
  • Sergio
    Sergio - 1999 Jaguar XJ8 - Engine - 12/30/2013
    Cranks no start, has spark in all cyl, fuel pressure okay, crank sensor good
    replaced cam sensors, new spark plugs get wet with fuel after a few cranks, all fuses and relays are good
     
    • HouseCallAuto
      12/25/2013 HouseCallAuto
      You mentioned nothing about any fault codes being stored. You have to check, it cannot be skipped. Post the codes here on the update Odds are that the engine is either severely flooded or the fuel pump is not supplying fuel pressure and has a bad pump. Did you check pressure with a fuel pressure gauge or not?
      HouseCallAuto
      12/25/2013 Sergio
      yes checked fuel pressure with gage, no dtc set but has pending code p1000. days before no start it would stall but then start up with no problems. also recently car had slite exhaust oder.
    • HouseCallAuto
      12/25/2013 HouseCallAuto
      P1000 is stored because all the readiness monitors have not run. It is not a fault that will prevent the monitors, it's simply there to tell you that they have not completed. Can you get a noid light and crank the engine and determine if there is sufficient fuel injector pulse?
      HouseCallAuto
      12/26/2013 Sergio
      I am sure I can get a noid light. once I get one what am I looking for? And thank you so much I truly do appreciate all the help you've given me, Thank you
      HouseCallAuto
      12/26/2013 HouseCallAuto
      I am suspecting a bad mass air flow sensor. The noid light will flash during cranking if there is injector pulse. if there is no injector pulse the noid light will not flash at all or will flash so quick that the light barely illuminates.
      HouseCallAuto
      12/26/2013 HouseCallAuto
      noid light set is cheap can be rented / borrowed from auto parts store
      HouseCallAuto
      12/26/2013 Sergio
      Okay did an injector test with the noid light and all flashed consistently with even pulse, not too fast nor too slow. The first initial flash was brighter than the rest that fallowed. Also noticed that the air filter is getting wet with oil.
      HouseCallAuto
      12/27/2013 Sergio
      after putting the car back together it acts more like it wants to start than before, and now it also give two codes ( P0102, P0112 ), any ideas what could be going on?
    • HouseCallAuto
      12/27/2013 HouseCallAuto
      Time to experiment a little. Try unplugging the mass air flow sensor and then try to start the car. By the way....the two codes you mentioned could be set if you unplugged the mass air flow sensor with the ignition on because the intake air temp sensor (P0112) and the mass air flow sensor (P0102) are both located within the mass air flow sensor and are not separate. If you did NOT unplug the connector with the key on, did you at least disturb it in any way while using the noid light? Did you unplug it at all? If not and these codes set during the noid light checkout it could mean that either the sensor is junk (I'm leaning that way) or one of the wires at the connector is an intermittent connection (as in a wire partially broken through under the colored insulation). No matter, I am thinking your no start cause is with the mass air flow sensor circuit (the sensor or the wires)
      HouseCallAuto
      12/27/2013 HouseCallAuto
      Try holding throttle to the floor while trying to start it. That is clear flood mode.
      HouseCallAuto
      12/27/2013 Sergio
      Yes I did disconnect the sensor then try to start it with it off, little change in the cranking like wants to start but can't, I also held the throttle to the floor still no change, smells like fuel and drains my battery.
      HouseCallAuto
      12/27/2013 HouseCallAuto
      Are the plugs maybe gas fouled? Are they reallt soaked with fuel? Maybe the spark is not strong enough?
      HouseCallAuto
      12/27/2013 Sergio
      the old plugs were bad so I got new ones. after a few cranks they get wet with fuel but I remove them, dry them, and blow out the cylinders before reinstalling the new plugs. I notice too that when I open the throttle body to look inside I can see a small amount of fuel setting at bottom
    • HouseCallAuto
      12/27/2013 HouseCallAuto
      Does it seem that the engine is spinning over too fast like low compression? I want you to check compression in at least two cylinders on each bank, but check them now while it does not start. I'm thinking the engine cylinders are washed with fuel and causing temportary low compression and an over-rich mixture. If the compression is low (there are no specs that I can find - specs not released by manufacturer) so assume 160 psi minimum. If the compression is low (like under 100) inject a few cc's of engine oil into each cylinder but first blow them out two ways: crank engine over with all apark plugs removed and with fuel delivery interrupted by any way that you choose - unplug injectors individually or remove fuse or fuel pump relay etc and also blow them out with com mpressed air. Then after that with a little oil in each cylinder use your air blower again to distribute the oil and make it ooze down the sides of the pistons and coat the cylinder walls. I think there is a good chance that this engine is becoming flooded because of over delivery of fuel (mass air flow sensor controls pulse-width of injector) Don't put more than a tablespoon of oil into each cylinder.
      HouseCallAuto
      12/28/2013 Sergio
      compression test is good in all cylinders. when cranking over sound like it wants to catch, as if it ran out of gas. earlier today though after sitting a while i cranked it over and it started up for just a second or so then shut down, it hasn't done that since i've been working on it.
      HouseCallAuto
      12/29/2013 Sergio
      Have some good news. I disconnected the breather tube off the air filter boot and cranked over the car and it started up, throwing out lots of white smoke. I reinstalled the all the parts that were off and the car continues to start with no white smoke but now it is displaying all these codes (P0300, P1316, P0135, P0141, P0155, P0161) all in the pending code test. And by the way, I am truly grateful, beyond measure for ALL your help you've given me. THANK YOU VERY MUCH
      HouseCallAuto
      12/29/2013 HouseCallAuto
      clear all those codes and then run the car and see what codes return. as long as it is atrting and running and driveable do not replace anything. Wait for it to throw new codes. Those codes that set are not reliable to act on at this time. Only codes that show after the car is running a day or so.
      HouseCallAuto
      12/29/2013 Sergio
      Okay, thanks I'll clear them and run for a while see what happens. I'll update you with the results to let you know what happen. Again, thank you, your advice has made a happy camper out of me.
      HouseCallAuto
      12/30/2013 Sergio
      Well I got the car to display the new codes they're (P0135, P0141, P0155, P0161) also, kinda smells a little like exhaust. Would a bad catalytic converter cause a no start? Runs grate though!!!!
    • HouseCallAuto
      12/30/2013 HouseCallAuto
      I can't pin this down for you exactly, but lets say almost... Getting all 4 of these codes at once (all of these are for all 4 oxygen sensor heater circuits not working) means that all of the O2 heaters share a common link: There is an oxygen sensor heater relay located in the "control module enclosure" and is maybe marked EM61 and the relay is brown in color. It would be impossible for all 4 O2 sensor heaters to fail all at the same time because of the O2 sensor itself so the one item that feeds a signal to all 4 sensor heaters is this relay. This type of diagnostic assumes that you can figure out how to check the function of this relay. You could remove the relay and replace it with a new relay, but that assumes the relay itself is bad. Of course if the relay is bad and you replace it, all the codes will not return again, but it could be another cause in this same circuit. A wiring diagram showing the relay and the wire colors and where each wire goes is kind of mandatory at this point for you to continue, just as I looked at a wiring diagram for your XK8 in order to provide you with this information right here.
  • AutoMD Member
    AutoMD Member - 2000 Jaguar Vanden Plas - Engine - 12/23/2013
    My car will start but has no compression in all the cylinders. What are the possible issues?
    Mileage 99,500. The car did run hot before this happened. I am hoping it is just a blown headgasket but even that issue should not cause it to have no compression in all the cylinders. Or am I wrong?
     
    • HouseCallAuto
      11/28/2013 HouseCallAuto
      There is a big difference between running hot and a massive overheat where the temp gauge is pinned on hot fully for several minutes or longer. Please expand the details of what you mean by "the car did run hot" before I get into this deeper. But even then you could not have NO compression in all cylinders unless you have another cause like jumped timing chain or cylinders flooded with fuel. Jaguar 4.0 engine is known for flooding and there is a PCM update as well to correct this. Remove all spark plugs and see if plugs look very wet with fuel. Add a small amount of oil to each cylinder and then crank over engine to distribute oil evenly over the piston tops and saturate rings for sealing. Clean or replace the spark plugs and try to start the engine after a few hours of soaking with the oil.
      HouseCallAuto
      12/1/2013 AutoMD Member
      Thanks for the information. The info I provided previously was info that was told to me by the owner. I now have possession of the car. Like I said prior, it does start and run but sputters along. On the dash it reads "Restricted Performance" As far so I can see there are no visible signs of a blown headgasket, so I assume it got this information when he took it to the dealer and was told that there was no compression on the cylinders. I will try the procedure you recommended. Will let you know
      HouseCallAuto
      12/1/2013 HouseCallAuto
      The procedure no longer applies to a car that starts and runs. What you need to do is plug in a code reader and read fault codes. If you do not have a code reader you can buy one at amazon for $20 and then post the codes.
    • Maize
      11/28/2013 Maize
      It's absolutely impossible for a car to have no compression in all the cylinders and still start.
    • HouseCallAuto
      11/28/2013 HouseCallAuto
      I guess I wasn't payin attention good enough when I read this. I agree with Maize of course. Please rewrite this so I know for sure what you have goin on.
    • AutoMD Member
      12/23/2013 AutoMD Member
      Update. I changed the spark plugs. Spark plugs had oil on top of them and around the threads. I'm thinking it got there as I was take them out. The codes i am getting are:
      P0300 P0301 thru P0308, P1314, P1642, P1316, P1000. It showed every cylinder as having a mis fire.
    • HouseCallAuto
      12/23/2013 HouseCallAuto
      Jaguars are known for bad timing chains causing misfires. I have only seen this happen though with misfires present on one bank only because usually only one timing chain jumps on one side, but it is possible to have both chains jumped and get misfires on 8 cylinders. The other cause of 8 misfires would be 2 completely blocked catalytic converters which is less likely.
  • AutoMD Member
    AutoMD Member - 2000 Jaguar Vanden Plas - Engine - 11/28/2013
    My car starts but has no compression on all 8 cylinders. What are the possible problems?
    Mileage 99,500. The car did run hot before this happened. I am hoping it is just a blown headgasket but even that issue should not cause it to have no compression in all the cylinders. Or am I wrong?
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2002 Jaguar X-Type - Engine - 11/27/2013
    What does " DSC system failure " indicate ?
    light came on when driving to work
     
    • Jimm
      11/27/2013 Jimm
      Dynamic Stability Control = DSC. If the amber light blinks, this means the stability control is working. If the light came on only momentarily - this indicates a functioning stability control / traction control system.

      The steady (permanent / static) display of 'DSC System Fault' amber warning means that DSC may not activate under wheel spin or slide conditions. According to the Driver's handbook, the vehicle may still be driven.
      The permanent display of the ABS warning light similary indicates ABS will not be available and the brakes will operate as they would on a vehicle not equiped with ABS.
  • AutoMD Member
    AutoMD Member - 2004 Jaguar X-Type - Engine - 11/25/2013
    Does an alternator need to be replaced right away because it's putting out 15amps?
    50,100 miles - battery light has been coming on intermittently (about 3 times a year for two 1/2 hears) - had battery checked two years ago - techs found full charge and no problem with electrical system - Nov 22nd battery light came on again - I was donating my car ...
     
    • John's Auto Repair
      11/25/2013 John's Auto Repair
      If your giving it to your daughter, I would replace the alternator. 15 amps is nothing. When you start
      turning on acessaries, like the headlights, wipers and A/C on you are way over the 15 amps the
      alternator is putting out.
  • AutoMD Member
    AutoMD Member - 1986 Jaguar XJS - Engine - 11/10/2013
    Fuel pump won't stay on long enough for engine to stay running
    have replaced relay, pump will run, on and off intermittenly, removed cover from relay, can squeeze the contact and pump will run ???
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2006 Jaguar S-Type - Engine - 11/2/2013
    I have a jaguar vehicle s type 2006 module not running in A PERFECT WAY. SPEED REACHING ONLY 40 KM/HR NOT MORE.
    1) 97000KM ONLY.WE CHANGE PLUGS GET IT FROM JAGUAR COMPANY( NGK R6 PLATINUM 2)WHEN I START THE ENGINE IN THE MORNING ENGINE RUNNING WITH CHOKE VERY GOOD WHEN CHOKE STOPPED ENGINE VIBRATEING PUT EXCELATOR OK WHEN I MOVE THE CAR SMALL TRIP THE CAR STAR TO MAKE ...
     
    • HouseCallAuto
      11/2/2013 HouseCallAuto
      Plug in a code reader and see what fault codes are stored. I am certain there are codes stored. You cannot skip checking for codes. Update the post with the code numbers.
 
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