Still misfiring if anyone has an idea ???
#1
02-22-2018, 08:14 PM
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Still misfiring if anyone has an idea ???
I posted a while back about flashing cel vdc off light on and slip light on I've replaced the plugs coils injectors and today the crank position sensor and after I replaced that today it got worse sounded like a machine gun thinking bad ecu I even brought it to a mechanic that works on these and he's stumped he said today ecu maybe gonna try the cam position sensor tom than Idk I guess ecu anyone have any thoughts? Hooked up to comp not throwing any codes except random msfirev
#2
02-22-2018, 08:43 PM
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I'd take it to Nissan for a real diagnostic, hooked up to Consult-II or III they can check all sensors in actual relation to one another, oscilloscope, as well as test for proper ECU function.
It's usually cheaper to pay $150 for a diagnostic then it is to randomly throw parts at the car hoping something fixes the problem.
If you haven't already though take care of all the easy stuff like cleaning the MAF, checking for a stuck PCV valve, visually inspecting all coil packs for blistering of the epoxy resin top, scorching of the spark plug well, corrosion of the spark plug well contact spring, checking spark plugs for obvious wear, fill up the tank with fuel from another station.
Since replacing the crank sensor made the problem WORSE then you could well have TWO bad crank sensors, if you didn't use an OEM one then it's highly likely.
Exactly what code(s) is the ECU sending, you should have at least P0300 and hopefully one specific to a cylinder.
It's usually cheaper to pay $150 for a diagnostic then it is to randomly throw parts at the car hoping something fixes the problem.
If you haven't already though take care of all the easy stuff like cleaning the MAF, checking for a stuck PCV valve, visually inspecting all coil packs for blistering of the epoxy resin top, scorching of the spark plug well, corrosion of the spark plug well contact spring, checking spark plugs for obvious wear, fill up the tank with fuel from another station.
Since replacing the crank sensor made the problem WORSE then you could well have TWO bad crank sensors, if you didn't use an OEM one then it's highly likely.
Exactly what code(s) is the ECU sending, you should have at least P0300 and hopefully one specific to a cylinder.
#3
02-22-2018, 09:23 PM
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I'd take it to Nissan for a real diagnostic, hooked up to Consult-II or III they can check all sensors in actual relation to one another, oscilloscope, as well as test for proper ECU function.
It's usually cheaper to pay $150 for a diagnostic then it is to randomly throw parts at the car hoping something fixes the problem.
If you haven't already though take care of all the easy stuff like cleaning the MAF, checking for a stuck PCV valve, visually inspecting all coil packs for blistering of the epoxy resin top, scorching of the spark plug well, corrosion of the spark plug well contact spring, checking spark plugs for obvious wear, fill up the tank with fuel from another station.
Since replacing the crank sensor made the problem WORSE then you could well have TWO bad crank sensors, if you didn't use an OEM one then it's highly likely.
Exactly what code(s) is the ECU sending, you should have at least P0300 and hopefully one specific to a cylinder.
It's usually cheaper to pay $150 for a diagnostic then it is to randomly throw parts at the car hoping something fixes the problem.
If you haven't already though take care of all the easy stuff like cleaning the MAF, checking for a stuck PCV valve, visually inspecting all coil packs for blistering of the epoxy resin top, scorching of the spark plug well, corrosion of the spark plug well contact spring, checking spark plugs for obvious wear, fill up the tank with fuel from another station.
Since replacing the crank sensor made the problem WORSE then you could well have TWO bad crank sensors, if you didn't use an OEM one then it's highly likely.
Exactly what code(s) is the ECU sending, you should have at least P0300 and hopefully one specific to a cylinder.
#4
02-22-2018, 10:22 PM
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Yeah I get that but without the proper tools like an oscilliscope to actually see the signal being sent by the sensors it's still mostly guesswork.
The dealership has the EXACT tools to read the symptoms, they also have the EXACT manual to follow for diagnostic prodecure, they also have computer software designed to integrate EXACTLY with the vehicle that literally tells them what the problem is.
These vehicles have very sophisticated computers and a lot of custom peripherial devices that Joe Mechanic doesn't have because theyre onpy for Nissan. If he's not charging you extra that's fine but just know for the money you've already spent Nissan would have figured out the EXACT problem with less headache and zero guesswork.
After you know the exact problem there's nothing wrong with having this guy do the repair work.
The dealership has the EXACT tools to read the symptoms, they also have the EXACT manual to follow for diagnostic prodecure, they also have computer software designed to integrate EXACTLY with the vehicle that literally tells them what the problem is.
These vehicles have very sophisticated computers and a lot of custom peripherial devices that Joe Mechanic doesn't have because theyre onpy for Nissan. If he's not charging you extra that's fine but just know for the money you've already spent Nissan would have figured out the EXACT problem with less headache and zero guesswork.
After you know the exact problem there's nothing wrong with having this guy do the repair work.
#5
02-22-2018, 10:39 PM
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Yeah I get that but without the proper tools like an oscilliscope to actually see the signal being sent by the sensors it's still mostly guesswork.
The dealership has the EXACT tools to read the symptoms, they also have the EXACT manual to follow for diagnostic prodecure, they also have computer software designed to integrate EXACTLY with the vehicle that literally tells them what the problem is.
These vehicles have very sophisticated computers and a lot of custom peripherial devices that Joe Mechanic doesn't have because theyre onpy for Nissan. If he's not charging you extra that's fine but just know for the money you've already spent Nissan would have figured out the EXACT problem with less headache and zero guesswork.
After you know the exact problem there's nothing wrong with having this guy do the repair work.
The dealership has the EXACT tools to read the symptoms, they also have the EXACT manual to follow for diagnostic prodecure, they also have computer software designed to integrate EXACTLY with the vehicle that literally tells them what the problem is.
These vehicles have very sophisticated computers and a lot of custom peripherial devices that Joe Mechanic doesn't have because theyre onpy for Nissan. If he's not charging you extra that's fine but just know for the money you've already spent Nissan would have figured out the EXACT problem with less headache and zero guesswork.
After you know the exact problem there's nothing wrong with having this guy do the repair work.
#6
02-22-2018, 10:41 PM
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Actually I just got done reading the manual and I just decided I'm taking it to the dealership I'm calling in the morning it just bugs me that I spent $200 for nothing but I just want my car fixed so I just read that they can diagnose with a consult tool and identify the prob instead of guess I just texted the mechanic to see if he had one but I assume if he had one he would have already used it so to the dealer I go I've worked in the car biz for the last 20 years at diff dealerships as a finance manager and can't believe I don't have one friend at a Nissan or infinity dealership grrr
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02-23-2018, 10:37 AM
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02-23-2018, 08:47 PM
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#9
02-23-2018, 08:53 PM
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#10
02-23-2018, 09:03 PM
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no no I wasn't paying them $275 for a single coil lol besides I replaced them originally tge mechanic I took it to did the one in cyl 6 w the plug and injector he got the coil so he was getting it tonight and he offered to change it too as he should have but it should be all set the tech said the coil prob kept up for a little while which explains why the misfire stopped for an hour plus but said it's not a high performance like the g so crapped out completely and that's why it's worse now that before
#12
02-23-2018, 09:09 PM
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#13
02-23-2018, 09:13 PM
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fyi the techs at the infinity dealership were crowded around my g today listening to the exhaust said it was one of the best sounding g's he's heard no lie he said it was the best part of my car lol circuit werks is def not your typical eBay junk
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02-23-2018, 09:15 PM
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#15
02-24-2018, 06:29 PM
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still not fixed replaced coil and it was not the wrong one so there went $300 out the window gunna trace all the electrical from the comp and if that isn't it than it has to be a bad ecu I mean what else could it be