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by smj999smj
Tue Oct 27, 2020 4:32 am
Forum: R51 Engine, Driveline and Powertrain
Topic: Downstream CAT question on 4.0
Replies: 10
Views: 91

Re: Downstream CAT question on 4.0

A good, custom exhaust shop could take your existing post cats and turn them into something similar for a lot cheaper, I would think. Cut the cat off, weld on a new section of pipe and a flange...it shouldn't be that hard. If you live in a state that has strict emissions inspections, they will fail ...
by smj999smj
Mon Oct 26, 2020 3:22 am
Forum: R51 Engine, Driveline and Powertrain
Topic: Should the heater pipe be a preventative maintenance part?
Replies: 23
Views: 2016

Re: Should the heater pipe be a preventative maintenance part?

You usually don't see the part that breaks because it breaks inside the hose. The plastic just gets really britten and breaks. The all-metal update looks like a good solution!
by smj999smj
Mon Oct 26, 2020 3:17 am
Forum: R51 Engine, Driveline and Powertrain
Topic: Downstream CAT question on 4.0
Replies: 10
Views: 91

Re: Downstream CAT question on 4.0

They are straight pipe replacements for the secondary converters made by Doug Thorley:

http://www.dougthorleyheaders.com/83206 ... ipes_15714
by smj999smj
Sun Oct 25, 2020 6:25 am
Forum: R51 Engine, Driveline and Powertrain
Topic: Downstream CAT question on 4.0
Replies: 10
Views: 91

Re: Downstream CAT question on 4.0

As I just mentioned, they are NOT monitored by the ECM, so, "no," they will not trigger the check engine light if you hollow them out. I replaced mine with DT mid-pipes and no issues.
by smj999smj
Sat Oct 24, 2020 1:33 am
Forum: R51 Engine, Driveline and Powertrain
Topic: Downstream CAT question on 4.0
Replies: 10
Views: 91

Re: Downstream CAT question on 4.0

They are rear catalytic converters, but they are not monitored for efficiency like the upstream converters.
by smj999smj
Wed Oct 21, 2020 11:36 pm
Forum: 1996-2004 Pathfinder (R50)
Topic: Head gasket leak
Replies: 1
Views: 34

Re: Head gasket leak

The blue coolant has a longer service life than the green, but is otherwise compatible. The Nissan green coolant is rated for 90,000 mile initial service, followed by 60,000 mile subsequent service intervals. Nissan blue coolant or equivalent has a manufacturer-rated, 105,000 mile interval, but is a...
by smj999smj
Wed Oct 21, 2020 11:27 pm
Forum: R51 Body Interior and Exterior
Topic: Dash Squeak - Climate Control
Replies: 2
Views: 40

Re: Dash Squeak - Climate Control

The mode doors are all operated by electric actuators, so I would think that the noise would be either a bad actuator OR an issue with the mode door, itself (such as foam falling off of it and causing it to bind, etc.). It might be hard to diagnose without getting a good look from under the dash or ...
by smj999smj
Wed Oct 21, 2020 11:19 pm
Forum: R51 Engine, Driveline and Powertrain
Topic: RevUP with JBA Headers
Replies: 7
Views: 143

Re: RevUP with JBA Headers

When you start your engine cold, the ECM is in open loop. It will not enter closed loop until the coolant temperature reaches the proper temperature. Also, at this time, heaters in the oxygen sensors are used to help warm up the sensors quicker. Once the vehicle enters closed loop, the ECM will use ...
by smj999smj
Wed Oct 21, 2020 11:06 pm
Forum: R51 Engine, Driveline and Powertrain
Topic: P0430 cat replacement
Replies: 9
Views: 1607

Re: P0430 cat replacement

The only time one needs to use catalytic converters from the manufacturer is if the vehicle is in a state that follows California emissions standards (i.e. CA, NY, MA) AND there is not an aftermarket version available that is C.A.R.B. certified. I would, however, recommend going with an established ...
by smj999smj
Sat Oct 17, 2020 4:51 am
Forum: Comments & Suggestions
Topic: No pdf attachments?
Replies: 1
Views: 28

Re: No pdf attachments?

I tried it on my end and I guess not, unfortunately.
by smj999smj
Sat Oct 17, 2020 4:45 am
Forum: R51 Engine, Driveline and Powertrain
Topic: P1283 Assist
Replies: 3
Views: 75

Re: P1283 Assist

When you replace the air/fuel sensors on these vehicles, you are supposed to erase the ECU self-learning or that code can be triggered. I would try erasing the self-learning memory and then perform and idle air volume re-learn before replacing any parts. if you suspect a bad injector(s)...which are ...
by smj999smj
Sat Oct 17, 2020 4:20 am
Forum: R51 Engine, Driveline and Powertrain
Topic: 100k miles service interval
Replies: 14
Views: 342

Re: 100k miles service interval

Sounds like it's working properly. I usually hear mine at first start-up or when sitting in a drive-thru line for a long time.
by smj999smj
Sat Oct 17, 2020 4:16 am
Forum: R51 Engine, Driveline and Powertrain
Topic: RevUP with JBA Headers
Replies: 7
Views: 143

Re: RevUP with JBA Headers

Lean mixture leads to pre-ignition detonation. As mentioned already, it'll damage the pistons and can potentially melt the ends of the spark plugs.
by smj999smj
Sat Oct 17, 2020 4:12 am
Forum: R51 Body Interior and Exterior
Topic: 2005 R51 Pathfinder Splash Guard Installation Instructions.........
Replies: 5
Views: 104

Re: 2005 R51 Pathfinder Splash Guard Installation Instructions.........

No drilling was required to install the mud flaps. IIRC, there was a plastic piece that was held on with screws that gets discarded when one installs the factory mud flaps and the screws are re-used or new ones were provided with the flaps (I forget which).
by smj999smj
Sat Oct 17, 2020 4:04 am
Forum: R51 General Chat
Topic: No heat in the cabin.
Replies: 6
Views: 148

Re: No heat in the cabin.

Yeah, that's not used on the V6 R51's (I have a 2006 & 2008, both V6's). Makes sense that it would be part of a heater pipe assembly, which is the way Nissan offers the heater pump.

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