Nissan patrol engine problem
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David William
- Newbie
- Posts: 1
- Joined: Sat Oct 27, 2012 5:25 am
Nissan patrol engine problem
It's just over 3year old and has done 69,000miles(motorway mileage).Now and again between 55 and 75mph it will give a kind of shudder,it actually feels like its on a rough road surface,then it picks up and will continue for maybe 20 miles before doing it again.the management light comes on and stays on.My local nissan dealer (who have serviced it for past 3 year )have had it in 3 times now,the last time being 9 days! First they said it was a lambda sensor problem,then a wiring problem,now they say it is "probably" the cat on the left bank of the exhaust system.They will not guarantee that putting a new one on at £1250 will definitely cure it.They have cancelled the fault on the computer and at the moment there is no light on and its running fine,but i know it will come back after a few miles.Surely if the cat was faulty it would run bad ALL the time? A mechanic friend of mine thinks the engine has an intermittent misfire and it will be throwing unburnt fuel into the exhaust system thus causing the engine management to think the fault is there,does that sound feasible?How on earth do i fix this problem when my main dealer cant help without them guessing at my expense?
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Crash bandicoot
- Hard Yaka
- Posts: 2924
- Joined: Thu Dec 30, 2010 7:19 pm
- Location: Towing a hilux
Re: Nissan patrol engine problem
1250 pound? i take it you are in england and it is a relativley new v6/v8 model petrol?
. here in new zealand when the "cats" start giving issues we tend to unbolt them and smash the core out with a steel bar and a hammer and bolt them back into the exhaust system....remove the sensor first though before procceding.
obviously this isn't the cure as a blocked cat is caused by an engine running to hot and carbon building up which blocks up the core of the "cat"
It could be something as simple as a poorly firing spark plug on one cylinder, or a crook injector.
Drive it for a week, at the end of that week remove all the sparkplugs and see if any of the electrodes are black and covered in soot/carbon....
They would normally be quite clean and white from heat.
take note of which cylinder(obviously on the side of the blocked cat).
If this is the case replace the sparkplug/and get the coil checked out by a auto sparky.
We here in nz have alot of grey import cars second hand and tend to see issues like this alot. another trick if the engine isn't burning fuel properly from degraded coils(just aged) is to increase/decrease the heat range of the spark plugs used so the elctrode can protrude further into the combusiton chamber more to give more area for the atomised fuel to burn from
. here in new zealand when the "cats" start giving issues we tend to unbolt them and smash the core out with a steel bar and a hammer and bolt them back into the exhaust system....remove the sensor first though before procceding.
obviously this isn't the cure as a blocked cat is caused by an engine running to hot and carbon building up which blocks up the core of the "cat"
It could be something as simple as a poorly firing spark plug on one cylinder, or a crook injector.
Drive it for a week, at the end of that week remove all the sparkplugs and see if any of the electrodes are black and covered in soot/carbon....
They would normally be quite clean and white from heat.
take note of which cylinder(obviously on the side of the blocked cat).
If this is the case replace the sparkplug/and get the coil checked out by a auto sparky.
We here in nz have alot of grey import cars second hand and tend to see issues like this alot. another trick if the engine isn't burning fuel properly from degraded coils(just aged) is to increase/decrease the heat range of the spark plugs used so the elctrode can protrude further into the combusiton chamber more to give more area for the atomised fuel to burn from
Waiter...there is a drought in my glass.
Re: Nissan patrol engine problem
for the engine light to come on the ecu picks up an eletronic siginal thats out side the range it operates within what code comes up that should give you a rough idea what area to look in my guess would be an ignition coil if its got seperate coils for each cylinder thats just a guess tho