Help,Help,Help, Had most all I can take.
#1
Help,Help,Help, Had most all I can take.
I backed the car off the ramps and within 10 seconds motor bogs down and smoke starts boiling out between firewall and motor,(smells like rubber burning) center little more to passenger. I have not touched anything back there WTH is going on ?
I went back out after smoked stopped. Thought it might be tranny so I left it in park,started it and motor is bogged down RPM is usually at 9,000 now about 4,000. Tried to rev motor and was like trying to drive with brake on.
Turned it off,waited a little while, put in neutral and same thing. Did not let run long enough for smoke to start. Has plenty oil,water. Was stone cold before starting and with in 10 seconds this happened.
I looked under car when it was smoking and could see smoke coming down around passenger catalytic converter. Oil pressure is good at 50.
Think a spun rear crank bearing,hope I'm wrong as I will part out or sell cheap.
I went back out after smoked stopped. Thought it might be tranny so I left it in park,started it and motor is bogged down RPM is usually at 9,000 now about 4,000. Tried to rev motor and was like trying to drive with brake on.
Turned it off,waited a little while, put in neutral and same thing. Did not let run long enough for smoke to start. Has plenty oil,water. Was stone cold before starting and with in 10 seconds this happened.
I looked under car when it was smoking and could see smoke coming down around passenger catalytic converter. Oil pressure is good at 50.
Think a spun rear crank bearing,hope I'm wrong as I will part out or sell cheap.
Last edited by macdoesit; 08-16-2017 at 05:36 PM.
#3
Does the marelli just go all the sudden ?
Thank you for help.
Last edited by macdoesit; 08-16-2017 at 08:34 PM.
#4
Before this goes any further, do yourself a favor and remove the P/S air filter. Is it wet with oil by chance? I know you said it had plenty of oil in it but, a little does go a long way when it comes to oil on hot components. Since you had it up on ramps, maybe some oil got on the exhaust and is making it smoke so much??
#5
Before this goes any further, do yourself a favor and remove the P/S air filter. Is it wet with oil by chance? I know you said it had plenty of oil in it but, a little does go a long way when it comes to oil on hot components. Since you had it up on ramps, maybe some oil got on the exhaust and is making it smoke so much??
Had on off ramps a lot past week no smoke.
Smells like rubber and engine has a lot of resistance, like giving it gas with emergency brake on.
Last edited by macdoesit; 08-16-2017 at 08:36 PM.
#6
With a Marelli failure one bank goes kaput but the engine doesn't get rough. Low power is the main symptom, followed very quickly by an overheating converter....sometimes to the point of glowing cherry red.
where is all the rubber smell smoke coming from ?
Might be some oil on the converter. Or the converter is getting hot enough to overheat anything close by. Sometimes to the point of starting a fire.
Does the marelli just go all the sudden ?
Yup.
Backtrack over your recent work and see if you've knocked some wiring loose or the like. If all that looks Ok pull the distributor cap and check the rotor.
If one bank is dead you can also try swapping modules (above the radiator) and coils to see if the problem goes to the other bank
Cheers
DD
The following users liked this post:
macdoesit (08-16-2017)
#7
With a Marelli failure one bank goes kaput but the engine doesn't get rough. Low power is the main symptom, followed very quickly by an overheating converter....sometimes to the point of glowing cherry red.
Might be some oil on the converter. Or the converter is getting hot enough to overheat anything close by. Sometimes to the point of starting a fire.
Yup.
Backtrack over your recent work and see if you've knocked some wiring loose or the like. If all that looks Ok pull the distributor cap and check the rotor.
If one bank is dead you can also try swapping modules (above the radiator) and coils to see if the problem goes to the other bank
Cheers
DD
Might be some oil on the converter. Or the converter is getting hot enough to overheat anything close by. Sometimes to the point of starting a fire.
Yup.
Backtrack over your recent work and see if you've knocked some wiring loose or the like. If all that looks Ok pull the distributor cap and check the rotor.
If one bank is dead you can also try swapping modules (above the radiator) and coils to see if the problem goes to the other bank
Cheers
DD
So I need a new cap and rotor ?
Glad to hear not real serious. I will check into it tomorrow.
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#10
Well, I think you can rule out a spun rear main bearing. I've never seen or heard one "go up in smoke". Leak, yes. But for the "gushing oil to get past the housing and under pan on to a cat would be rare indeed.
The thought occurs that a cam cover gasket could be leaking and that oil is getting on an exhaust pipe or even a cat.
That goes for the smoke.
But, as to the rough running, it means go to the diagnostics suggested above.
Carl
The thought occurs that a cam cover gasket could be leaking and that oil is getting on an exhaust pipe or even a cat.
That goes for the smoke.
But, as to the rough running, it means go to the diagnostics suggested above.
Carl
The following users liked this post:
macdoesit (08-17-2017)
#12
I don't understand " oil melted down the catalytic converter and plugged it"
#13
Well, I think you can rule out a spun rear main bearing. I've never seen or heard one "go up in smoke". Leak, yes. But for the "gushing oil to get past the housing and under pan on to a cat would be rare indeed.
The thought occurs that a cam cover gasket could be leaking and that oil is getting on an exhaust pipe or even a cat.
That goes for the smoke.
But, as to the rough running, it means go to the diagnostics suggested above.
Carl
The thought occurs that a cam cover gasket could be leaking and that oil is getting on an exhaust pipe or even a cat.
That goes for the smoke.
But, as to the rough running, it means go to the diagnostics suggested above.
Carl
#14
With a Marelli failure one bank goes kaput but the engine doesn't get rough. Low power is the main symptom, followed very quickly by an overheating converter....sometimes to the point of glowing cherry red.
Might be some oil on the converter. Or the converter is getting hot enough to overheat anything close by. Sometimes to the point of starting a fire.
Yup.
Backtrack over your recent work and see if you've knocked some wiring loose or the like. If all that looks Ok pull the distributor cap and check the rotor.
If one bank is dead you can also try swapping modules (above the radiator) and coils to see if the problem goes to the other bank
Cheers
DD
Might be some oil on the converter. Or the converter is getting hot enough to overheat anything close by. Sometimes to the point of starting a fire.
Yup.
Backtrack over your recent work and see if you've knocked some wiring loose or the like. If all that looks Ok pull the distributor cap and check the rotor.
If one bank is dead you can also try swapping modules (above the radiator) and coils to see if the problem goes to the other bank
Cheers
DD
#16
It uses a stepped double-ended rotor arm and a matched distributor cap. One end of the rotor arm is firing Bank A cylinders and the other end is firing Bank B cylinders.
So the failure of the rotor arm insulation causes 6 cylinders not to get sparks, hence one bank is out. You're then dumping fuel straight out the exhaust on that side with the subsequent heating up of the cat.
Hope that helps.
Paul
So the failure of the rotor arm insulation causes 6 cylinders not to get sparks, hence one bank is out. You're then dumping fuel straight out the exhaust on that side with the subsequent heating up of the cat.
Hope that helps.
Paul
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Greg in France (08-18-2017),
macdoesit (08-18-2017)
#17
Mac, you really should download and read the Great Palm's XJS maintenance book from Jaglovers. It is free and will very clearly explain all these and all other matters.
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macdoesit (08-26-2017)
#18
It uses a stepped double-ended rotor arm and a matched distributor cap. One end of the rotor arm is firing Bank A cylinders and the other end is firing Bank B cylinders.
So the failure of the rotor arm insulation causes 6 cylinders not to get sparks, hence one bank is out. You're then dumping fuel straight out the exhaust on that side with the subsequent heating up of the cat.
Hope that helps.
Paul
So the failure of the rotor arm insulation causes 6 cylinders not to get sparks, hence one bank is out. You're then dumping fuel straight out the exhaust on that side with the subsequent heating up of the cat.
Hope that helps.
Paul
#19
http://www.jag-lovers.org/xj-s/book/Jaguar.html
Last edited by macdoesit; 08-18-2017 at 02:43 PM.
#20
Correctly the ignition system is from Magneti Marelli, an Italian electronics and automotive producer with a roughly 'just as good' reputation as Lucas does (Prince of Darkness, inventor of the short circuit, ...). The ignition is a very complex setup, have been reading up on it and it uses/utilises more sensors and equipment than the EFI does, but works mostly reliable.
Due to the construction limits, it basically is two 6 cylinder distributors in one. Effectively turning the V12 into two I6 engines cast together. In theory it would be able to use cylinder deactivation (like modern V8, V12 and some I4 and even I3 engines) and run on one bank when cruising (it would actually be a rather easy implementation).
Due to the construction limits, it basically is two 6 cylinder distributors in one. Effectively turning the V12 into two I6 engines cast together. In theory it would be able to use cylinder deactivation (like modern V8, V12 and some I4 and even I3 engines) and run on one bank when cruising (it would actually be a rather easy implementation).
The following users liked this post:
macdoesit (08-26-2017)