We replaced all 6 plugs and #1 ignition coil. Still not firing. Car is driving on 5 cylinders. My mechanic said he would check for compression next. (He came to my house without his compression tester).

Could it be the fuel injector or ? Any help is appreciated.

 

Yes, it could be the fuel injector. But first, switch coilpack 1 with coilpack 3 and see if the problem moves to cylinder 3. If so, you still have a coilpack issue. If not, look at the injector.
Also, did you put replacement OEM coilpacks in? or aftermarket?
What sparkplugs did you put in?

 

We used Hitachi IGC 0012 coil and NGK 5464 Iridium plugs.

 

What Wizard said.

you bought the right brand of coil and also plugs.

Occasionally a brand new coil will be defective even when new. That's why he wants you to move the new coil to a different cylinder. If the problems move with the coil, a coil is defective.

Our cars seldom have compession issues.

The fuel injector 's are failing regularly now.

Do some research about that. DON'T buy all new injectors.

did you keep track of which plugs came from which cylinders? If do, send photos. Tell us which plug came from the non firing cylinder.

 

The last thing you also want to do is, if the above methods don't show any results, check the harness for shorts and the continuity and battery volts, to make Sure the harness has no breakage going to the coils.

 

also if an injector is bad it does not always throw a code they just die. if they are all original it would not be a bad idea to replace em all

 

I don't think Brett is coming back with an update or more questions....Been 20 days since he last logged on.

 

I apologize for not returning sooner. We swapped the coils and the problem stayed on cylinder 1. It didn't throw a code when I had it scanned but I understand injector failure may not show up. How long will it take an experienced mechanic to replace the #1 injector ?

thanks

 

1 hour if he's very, very familiar with 4th gen Maximas, 2 hours max. First timer shade mechanics may need 3 to 4 hours. The two back bolts at the back of the manifold can be a pain, and the two coolant hoses under the manifold near cylinder #5 can be a pain too. He should really do a coolant bypass while he's in there to make future work a breeze. Good luck. Be sure to report back if this fixed your issue. May want to consider taking care of cylinders 3 and 5 while you're in there...

 

The rule of thumb is if you’re gonna replace 1 injector in the rear, you must replace the other two like Mr. Wizard said. Otherwise you’re gonna regret it if you don’t.

 

Our injectors are 20 to 25 years old.
They are failing due to age alone it seems.

Once one fails, the others will soon.

the manifold needs to be removed to replace the rear injectors. That is a pita do do. It will cost money if you pay a mechanic.

It's highly advised to replace all three rear injectors at once. Or the manifold will need to be removed again, and soon.

might as well check the knock sensor for cracks while the manifold is off. The sensor is easy to replace at that time, bit a pita if it's on.