Please help guys,
I have ran into a problem from changing the valve cover gaskets on my 2002 maxima se which i also just bought from a guy with 140k on it. The service engine light came on after i reassembled everything. The codes show that its having multiple cylinder misfire mainly i think but also codes
p1448(Evap canister vent control valve)
p1800(VIAS Control Solenoid Valve Circuit Open because i took out the valve for the vias delete which probably sucks anyway)
p0507(idle speed control system)
p0455(evaporative emissions system large leak( I think from leaving gas cap off once i think...))
The car is driving unbelievibly sluggish, its putts from the exhaust, engine seems to shake more at idle and when giving gas to it. I only babied it to get the codes checked about 3 miles. So can any one tell me what might have gone wrong and what i need to correct? I know i tightened the intake manifold bolts down too much so will i need to replace the gasket again i think right? I also found that one of the coils was bad and oil was getting into the spark plug tube so i replaced the coil and plug which are both different from the others now. Please help I need to fix this.. don't have funds to bring to shop. Thanks.

 

Go back over all connections. Most likely you're missing something.
Also, when you redid the gaskets, did you put RTV sealant in between the valve cover and the 'seated' area near the timing chain cover?

Regarding the oil, that's common. You'll need a new rear valve cover. Get the rear (right) valve cover for a 2004 and never worry about that happening again.

 

Just to add to the previois advice...did you get an OEM coil to replace the other one? If not, return it and get OEM.

 

Check those 2 connectors on the passenger side firewall, to the left of the intake manifold elbow.

 

Lmao...obligatory 'ask me how I know' post

 

Okay so I took it all apart i think one of the coils wasn't firing properly. Its running good again. But I think it still might be leaking oil from the rear valve cover . I used quite a bit of rtv blue silicone on both them and the front one seemed to sealed up fine. And i switched to synthetic once i bought the car maybe its leaking from somewhere else now? Its dripping off the oil pan but i don't think its coming from it.

 

Some other problems I'm having are that when i have the heat on high or medium speed there seems to be a weird sound coming from the dash (maybe the fan motor?). Also, it seems like only one wheel is spinning when im driving. It is the 6 speed it that makes any difference...The way i figured this is when I had it on stands and turned it on to bleed the power steering system the right wheel was spinning when i had it in neutral and the left wasn't moving at all.

 

The oil leak over your oil pan...are you certain it's oil and not the power steering fluid? (since you bled it recently maybe something is leaking)

Weird sound - either describe it better than 'weird sound' or make a small video and upload it to youtube, then post it.

Also, if you do not have HLSD then one wheel could definitely spin on its own.

 

How can i tell what kind of differential i have??

 

vin number plate on firewall.

Transaxle
HLSD starts with an H
Non HLSD starts with an A

Please double check that, working off of memory.

 

If you have both wheels in the air and spin one and the other either doesn't turn or turns in the opposite way then you do not have HLSD.
If the wheels spin in the same direction then you do have HLSD.

IIRC