Jaguar making popping noise from top of intake
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Jaguar making popping noise from top of intake
Okay, here is the story. A customer brought in today a 2001 xj8 with the 4.0 engine. Has been run in RP mode for a while. While driving today car was run out of gas. There is now gas in the car and it runs but making popping noise coming from top of intake (or at least that is where it seems to be coming from). It sounds as if it is a engine being run with no exhaust at all.
codes present - p0300 - 0304, p0112, p1000.
Have looked at the spark plugs and all seemed to be pretty crappy but I have not checked the gap yet. Fuel pressure is fine.
Apparently one of the timing tensioners was recently replaced and ever since then car has been in RP mode with multiple misfires.
My questions are:
What would cause that popping? Could it be the misfires? Intake Manifold or catalytic converter problem?
On Alldata, it shows bank one being the left if you are standing in front of the car. It also shows the firing order as 1-4 (front to back) for both sides. So how do you tell which bank the misfire is coming from if they are both going 1-4 as opposed to the 1-4 then 5-8.
Any help would be greatly appreciated, I am a general mechanic not a Jaguar specialist, but I would like to try and help the guy out as well as learn something new.
codes present - p0300 - 0304, p0112, p1000.
Have looked at the spark plugs and all seemed to be pretty crappy but I have not checked the gap yet. Fuel pressure is fine.
Apparently one of the timing tensioners was recently replaced and ever since then car has been in RP mode with multiple misfires.
My questions are:
What would cause that popping? Could it be the misfires? Intake Manifold or catalytic converter problem?
On Alldata, it shows bank one being the left if you are standing in front of the car. It also shows the firing order as 1-4 (front to back) for both sides. So how do you tell which bank the misfire is coming from if they are both going 1-4 as opposed to the 1-4 then 5-8.
Any help would be greatly appreciated, I am a general mechanic not a Jaguar specialist, but I would like to try and help the guy out as well as learn something new.
Senior Member
Joined: Dec 2010
Posts: 383
Likes: 70
From: NW Alabama
I'm not a mechanic, and I'll just give you what the book says about these codes.
P1000 System checks not complete since last memory clear
P0300 Random misfire detected
P0304 Misfire detected – cylinder A4 (4)
Cylinder compression low
Worn camshaft / broken valve spring(s)
Fuel delivery pressure (low / high)
Fuel injector(s) blocked / leaking
Fuel injector(s) continuously open
Fuel contamination
Fuel injector circuit fault(s) (Injector DTCs also flagged)
Spark plug failure / fouled / incorrect gap
ECM to ignition module primary circuit fault (Cylinder misfire detected DTCalso flagged)
Ignition module ground circuit open circuit, high resistance
Ignition module / coil failure
P0112 IATS sense circuit high voltage (low air temperature)
IATS to ECM wiring open circuit or high resistance
IATS to ECM sensing circuit short circuit to B+ voltage
IATS failure (Intake Air Temperature Sensor)
P1000 System checks not complete since last memory clear
P0300 Random misfire detected
P0304 Misfire detected – cylinder A4 (4)
Cylinder compression low
Worn camshaft / broken valve spring(s)
Fuel delivery pressure (low / high)
Fuel injector(s) blocked / leaking
Fuel injector(s) continuously open
Fuel contamination
Fuel injector circuit fault(s) (Injector DTCs also flagged)
Spark plug failure / fouled / incorrect gap
ECM to ignition module primary circuit fault (Cylinder misfire detected DTCalso flagged)
Ignition module ground circuit open circuit, high resistance
Ignition module / coil failure
P0112 IATS sense circuit high voltage (low air temperature)
IATS to ECM wiring open circuit or high resistance
IATS to ECM sensing circuit short circuit to B+ voltage
IATS failure (Intake Air Temperature Sensor)
Veteran Member
Joined: Feb 2011
Posts: 9,733
Likes: 2,203
From: on-the-edge
The banks are A and B with cylinders 1-4.
The tensioner replacement is full of risks for the careless or inexperienced.
Find out which bank had the tensioner was replaced.
If it is bank A, then looking at the cam timing is a good start.
The tensioner replacement is full of risks for the careless or inexperienced.
Find out which bank had the tensioner was replaced.
If it is bank A, then looking at the cam timing is a good start.
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