How to diagnose rich running on Jaguar XJ6?
Diagnosing rich running on the fuel injected 4.2L engine, covers checking of the coolant temperature sensor, fuel pressure regulator, oxygen sensor, fuel injectors, cold start circuit, fuel changeover system, air flow meter (AFM), and ECU. This information pertains to the Jaguar XJ6 Series II-III models with the fuel injected 4.2 engine.
Why does my Jaguar XJ6 engine not start?
For a period of approximately a month, the engine became harder and harder to start, until one day, it wouldnt start at all. The engine would crank and eventually start at time though.
Can you replace the wiring on a Jaguar XJ6?
Incidentally, JagBits has a very nice article written about replacing XJ12 wiring that is also relative to other cars. Pictures too! As it turned out, once the pitiful cloth insulation was removed, many wires leading to the coil where cracked, with some hanging on by a few wire strands underneath.
Can a Jaguar XJ12 be replaced under the bonnet?
The Brits (still trying to get back at us for the Revolution), are very poor with their wire insulation and even worse at their artistic endeavor to provide a clean under-bonnet wiringat least in this vintage Jaguar. Incidentally, JagBits has a very nice article written about replacing XJ12 wiring that is also relative to other cars.
Why does my Jaguar XJ6 not start up?
About half of the time, the reason why the Jaguar XJ6 will not start or quits running is because of the two main electrical problems that I described above. The other cause of the XJ6 not starting or quits running is the fuel system. Mostly, it is the fuel pump being killed by rust flakes from the two fuel tanks.
Diagnosing rich running on the fuel injected 4.2L engine, covers checking of the coolant temperature sensor, fuel pressure regulator, oxygen sensor, fuel injectors, cold start circuit, fuel changeover system, air flow meter (AFM), and ECU. This information pertains to the Jaguar XJ6 Series II-III models with the fuel injected 4.2 engine.
Incidentally, JagBits has a very nice article written about replacing XJ12 wiring that is also relative to other cars. Pictures too! As it turned out, once the pitiful cloth insulation was removed, many wires leading to the coil where cracked, with some hanging on by a few wire strands underneath.
The Brits (still trying to get back at us for the Revolution), are very poor with their wire insulation and even worse at their artistic endeavor to provide a clean under-bonnet wiringat least in this vintage Jaguar. Incidentally, JagBits has a very nice article written about replacing XJ12 wiring that is also relative to other cars.
Why is my Jaguar’s Type engine not working?
Specifically the gauge may end up reading as 3/4 full when in fact it has been the tank has been completely filled. If the ignition coil fails, this can lead to engine mis-firing and engine idling. Faulty engine coils are a common complaint for S-type users. The ignition coil may be weak, or it may have failed completely.
What are the most common problems with a Jaguar?
Below are some of the most common problems which have cropped up with the different models of Jaguar. We have listed models both old and new. The X-type Jaguar is prone to problems with acceleration and can be clumsy when changing gears. This has led to a number of complaints about this issue on forums and discussion sites.
Are there any problems with the Jaguar XF?
Suspension on both Jaguar X-type and Jaguar XF models has been known to succumb to wear and tear over time. The rear suspension in particular is subject to decay. The problem is first identifiable from a knocking noise if the car is driven over speed bumps and/or rough surfaces.
What happens if a fuel pump goes bad in a Jaguar?
Thus, keeping a regular tab on these components is highly essential to avoid being stranded or stalled in traffic. If you face any issues with your Jaguar fuel pump or notice anything strange within it, do not hesitate to consult an Expert as running your car with a faulty pump can cause huge internal damage.
What causes the fuel regulator on a Jaguar XKR to fail?
What could cause the fuel regulator on a Jaguar XKR to fail constantly despite changing the fuel pump? A faulty fuel pump drive module could likely cause this issue. Inspect the fuel pump driver module for a proper signal from the ECM. Then, check the signal flow from the module to the pump.
What kind of engine does the Jaguar XJ6 have?
This information pertains to the Jaguar XJ6 Series II-III models with the fuel injected 4.2 engine. However, in a broader sense, many of the items mentioned apply to other fuel injected models as well.
About half of the time, the reason why the Jaguar XJ6 will not start or quits running is because of the two main electrical problems that I described above. The other cause of the XJ6 not starting or quits running is the fuel system. Mostly, it is the fuel pump being killed by rust flakes from the two fuel tanks.
What are the components of a XJ6 fuel pump?
I believe it to be accurate for all Series III XJ6 cars but some of the earliest cars may be different. There are three main components to the system: the trunk-mounted, constant pressure electric fuel pump, a control relay, and a voltage directing diode pack.
What kind of engine does a Jaguar XJ6 have?
Air conditioning was standard, but no manual gearbox was offered. Jaguar raised the XJ6 and XJ12 front bumpers to meet U.S. regulations in the 1974 Series II, and fuel-injection replaced the V-12’s four carburetors, pumping the engine from 244 hp to 285 hp in 1975. The XJ6 was fuel-injected from 1978 and both were LWB-only from 1974.
What to do if your Jaguar XJ6 won’t start?
If your XJ6 or XJ12 won’t start, grab your voltmeter and follow this checklist. Covers checking spark plugs, coil, wires and distributor cap, ballast resistor, amplifier and distributor pick-up, fuel supply, fuel pump and relay, air flow meter, fuel injectors and ECU.
Why are Jaguar XJ6 and XJ12 not worth more?
The V-12 is more difficult to maintain, and overheating issues were exacerbated by catalytic converters raising under-hood temperatures to crematorium levels. Rubber fuel hoses in the V never stood a chance. Ray Nierlich is a lifetime Jaguar expert, and has been Dr. Jaguar in Newport Beach for 25 years.
Where is the fuel supply hose on a Jaguar?
Disconnect fuel supply hose at the fuel rail (at the rear of later “straight rail” cars and at the bottom of the early “loop style” rails). Some fuel may spill, have rags and container handy. A properly operating pump will produce about 34 PSI so, again, be ready ! Position fuel hose so fuel will flow into the container.
Where is the transmission on a Jaguar XJ6?
Transmissions are a four-speed automatic equipped with a lock-up torque converter. The transmission is mounted to the back of the engine, and power is transmitted to the fully independent rear axle through a two-piece propshaft.
What kind of suspension does a Jaguar XJ6 have?
The rear suspension is an independent type suspension which also have coil spring/shock absorber assemblies and a lower control arm. The rear driveshaft acts as the upper control arm. Power-assisted Anti-lock Brake Systems (ABS) with four-wheel disc brakes are standard equipment on all Jaguar XJ6 models covered in this manual.
How do you unlock a Jaguar XJ6 S3?
Grounded through solenoid body Boot/Trunk locks only but can be wired to unlock by adding a 2mmsq cable as shown in green Thermal breaker OR OR OG Backlight Warning Lamp Control Switch Delay Unit Fuse 12 To Ignition switch protection Relay 9 Jaguar XJ6 S3 Small item Schematic
How often should the oxygen sensor be replaced in a Jaguar?
According to Jaguar and the other auto manufacturers, the oxygen sensor should be replaced every 30,000 miles to ensure troublefree performance. There are two different types of oxygen sensors, sensors with one wire and sensors with three wires.
What kind of transmission does a Jaguar XJ6 have?
Jaguar XJ6 Service and Repair Manual 3261 Jaguar XJ6 Models covered Jaguar XJ6 models with 3.2 litre (3239 cc), 3.6 litre (3590 cc) & 4.0 litre (3980 cc) six-cylinder in-line dohc petrol engines and automatic transmission
Where is the aircon cooling fan on a Jaguar XJ6?
Aircon Cooling Fan XJ6 Schematic Horn Schematic Thermo Switch in RH lwr side of Radiator Red Relay LH of Rad 86 87a 87 85 30/51 N/G G/U Orange wire shows the modification to make the fan run whenever the AirCon Compressor is running To engine Loom connector RHS lower wing valance IN4001 Diode 10 Transducer 10:30
What causes rich fuel mixture on EFI XJ6?
The coolant temp sensor is a common culprit. The main purpose of this sensor is to “tell” the ECU that the engine is cold so that a richer mixture, required with a cold motor, will be provided. In this sense it is similar in intent to an automatic choke on a carbureted engine.
Where is the fuel vapor cannister on a XJ6?
If this happens, excess fuel can be drawn into the fuel vapor cannister (in front of the right front tire) and, from there, is drawn by engine vacuum directly into the engine. A fuel drip in the area of the front wheel is an obvious indicator.
What are the fault codes for the AJ6 engine?
Fault codes and related functions are listed below. 15CU Fault Codes and Functions – 3.2 and 4 litre AJ6 Engine Idle pot. Looks for more than 4 volts on trim pot wire. Defaults to 2.5 volts. Air flow meter. Looks for air flow meter signal less than 0.2 or more than 4.5 volts between 400 and 300 r.p.m. Coolant thermistor.
How to read the Jaguar 3.6 fault code?
1. READING FAULT CODES JAGUAR 3.6 – LUCAS 9CU SYSTEM Code Display Procedure. When the facia display indicates “Fueling Failure” it is indicating that a fault has been detected. The fault identification number can be displayed as follows when the vehicle is stationary. Switch off engine. Wait 10 seconds.
Where do I find the fault code on my XJ-S?
XJ-S will automatically display code 5 seconds after ignition is switched on. Fault code number should be seen on VCM or trip computer display. Fault codes can only be cleared by use of dealer JDS, PDU or similar (also to display fault codes) or by grounding the lead provided for the purpose from the ECU (see below).
What should the idle setting be on an AJ6?
Check idle CO – factory setting quoted as 1-2% but we find that most engines idle best with a weak setting around 1% or even slightly less depending on HC emision being stable. Run engine until fully warm. Switch off ignition. After 5 seconds switch on ignition – wait 5 seconds – remove connector from stepper motor.
This information pertains to the Jaguar XJ6 Series II-III models with the fuel injected 4.2 engine. However, in a broader sense, many of the items mentioned apply to other fuel injected models as well.
If this happens, excess fuel can be drawn into the fuel vapor cannister (in front of the right front tire) and, from there, is drawn by engine vacuum directly into the engine. A fuel drip in the area of the front wheel is an obvious indicator.
Which is the best Holley fuel pressure regulator?
Read reviews for Holley Fuel Pressure Regulator When autocomplete results are available use up and down arrows to review and enter to select. Touch device users, explore by touch or with swipe gestures. 3 out of 5 stars. Read reviews for Mr. Gasket Fuel Pressure Regulator
The coolant temp sensor is a common culprit. The main purpose of this sensor is to “tell” the ECU that the engine is cold so that a richer mixture, required with a cold motor, will be provided. In this sense it is similar in intent to an automatic choke on a carbureted engine.
Can a bad fuel pressure regulator cause a fuel leak?
Fuel leaks Another symptom of an issue with the vehicle’s fuel pressure regulator is fuel leaks. If the fuel pressure regulator’s diaphragm, or any of the seals fail, fuel leaks can occur. A faulty regulator can not only leak gasoline, which is a potential safety hazard, but can also cause performance issues as well.
Why is the spark plug on my fuel regulator sooty?
If it is sooty, it could be a sign of a bad fuel pressure regulator. If you find a plug in this condition, check the rest of them. A sooty spark plug could just mean the engine is burning oil at that head. If you end up replacing your fuel pressure regulator, you might also want to replace your plugs.
Can a bad fuel pressure regulator cause black smoke?
A faulty fuel pressure regulator can cause the vehicle to run excessively rich, which apart from reducing mpg and performance, can cause the vehicle to produce black smoke from the tailpipe. Black smoke can also be caused by a variety of other issues, so having the vehicle properly diagnosed is highly recommended.
How to troubleshoot fuel pump data error on Jaguar X type?
How to troubleshoot a fuel pump data error on a Jaguar X Type? First, hold down the trip button on the turn signal stalk for a while. Then, with the button still pressed in, turn the ignition on. Wait until the message center displays ‘Engineering Test Mode.’ This will cause the gauges to do a sweep test.
Fuel leaks Another symptom of an issue with the vehicle’s fuel pressure regulator is fuel leaks. If the fuel pressure regulator’s diaphragm, or any of the seals fail, fuel leaks can occur. A faulty regulator can not only leak gasoline, which is a potential safety hazard, but can also cause performance issues as well.
How do you remove a fuel pump from a Jaguar?
Separate the electrical connector module to the pump from the holding bracket and disconnect the electrical connector. Next, remove the locking ring and reposition the upper part of the pump. Make sure to detach the part before placing back. Then, discard the gasket on the pump and remove the pump. Finally, disconnect the fuel cross over lines.
When did the Jaguar X300 XJ Executive come out?
Jaguar announced the launch of the X300 XJ Executive on the 10th April 1996 thus: It made its debut at the Fleet Show on the 23rd April 1996.
What’s the difference between X300 and XJ6 3.2?
Based on the X300 XJ6 3.2, the Executive offered an equivalent specification, but with automatic transmission, climate control, sports-style hide seats, a wood and leather steering wheel, and wooden gear selector knob, all included as standard.
Why is my Jaguar X300 XJ not working?
In these vehicles, the driver may experience extending cranking when attempting to start the engine when it is hot (i.e. the engine has been recently running and then turned off) due to a defect with the fuel tank pressure control valve (Rochester valve). If confirmed, the valve was to be replaced.
When did the Jaguar X300 XJ6 come out?
In August 1995, Jaguar issued technical bulletin 12-57 for 1995 model year 1995 model year Jaguar X300 XJ6 vehicles. To improve idle quality, revised camshafts with reduced valve timing overlap were introduced as running change 95/13.
What kind of engine does a Jaguar X300 have?
In May 1995, Jaguar issued technical bulletin 12-54 for 1995 model year Jaguar X300 XJ vehicles with naturally aspirated 4.0-litre AJ16 engines. In these vehicles, hotter spark plugs were installed in production from VIN 720189.
How to remove the intake duct from a Jaguar?
Remove the intake duct. With assistance, visually observe throttle butterfly operation as the ignition is switched ‘ON’ for the first time. Throttle butterfly should fully close, then immediately open to the idle position. Did butterfly stick closed? Switch ignition ‘OFF’. Lightly press throttle butterfly with finger to the fully closed position.
How can I repair my Jaguar engine harness?
Check for signs of corrosion in the connectors, backed out pins or damaged pins. If a problem is found refer to the Jaguar Wiring Harness Repair guide. Publication Number JTP 586 Always use the recommended Jaguar harness repair kit 418-S065 and 418-S411. P 14 Engine Harness
What causes a Jaguar X type to run lean?
Checking fuel pressure will give you an idea about the fuel filter or imminent failure of the fuel pump. Clogged fuel tank venting could also cause a reduced fuel pressure. A couple of fouled injectors could also be causing it to run lean. In 1984 I ran into a whole slew of Oldsmobiles that consistantly fouled injectors when using Texaco gas.
What are the faults of a 2005 Jaguar X-type?
I have a 2005 Jaguar X-type. I had the same faults P0171 and P0174 and changed out the O-Ring, Air filter, Fuel filter, cleaned the MAF sensor and still no change. I then decided to change out the brake booster hose and sure enough, it had a nice size whole in the check valve (middle part).
Can a Jaguar 2.5 be changed to a 3.0?
On the 2.5 the one closet to the rear can be changed in place by tilting it toward the front of the vehicle to remove and reinstall it. The 3.0 often requires removing the intake to replace it’s gaskets for those actuators. I bought the gaskets for my 2.5 but have not yet needed to replace them. They are not expensive. 5 people found this helpful.
Remove the intake duct. With assistance, visually observe throttle butterfly operation as the ignition is switched ‘ON’ for the first time. Throttle butterfly should fully close, then immediately open to the idle position. Did butterfly stick closed? Switch ignition ‘OFF’. Lightly press throttle butterfly with finger to the fully closed position.
How old was my father when he bought a Jaguar XJ6?
I could not believe it when my father bought a 1983 XJ6L Vanden Plas in about 1992. I was about 23 years old, and a mechanical engineering student at the University of Florida.
Is the XJ6 3.2 X300 a good car?
Its been so much more reliable than the good ladies MB. The ride is superb. The handling it fun. The engine is a peach. Even with the 3.2 it doesn’t feel under powered. Saloon cars just don’t come any better, and probably won’t ever in the future either. I have an 1996 Sovereign 3.2 LWB and it’s just brilliant.