Thanks, Good to be back in the G35 again, its a fun car.

 

Glad to have you back! I remember your unique mods and you taught a lot of us how to repair the broken comp rod stud. Scary thought having to do that.

im also engine swapping my G at the moment. Well, sold my old one in 2020 and bought a diff one this spring. Currently in project car mode stuffed in the back of the garage. Don’t forget to do the timing gallery gaskets while apart, a necessary service.

 

Hope you continue to post often again. So informative. I wish you were my neighbour.

 

I did actually buy all those gaskets from Z1 a few months ago..then the car sat.. engine sat.. and finally I found the time (energy) to get the engine into the car. And the gaskets are still in the box.

 

Thanks. Yes my next door neighbor is a good friend. He has a big family and lots of cars. I'm regularly schooling him on "fleet maintenance"

 

Spent the morning on an oil change and finally bracing the underside of this floppy duraflex Inven front bumper. I'll post some pics in a bit, but the Sarona skirts in the pics are not on the car anymore. Not my style. First $100 gets them for anyone interested. Pick up in Myrtle Beach, SC.

Still working thru issues but I did clean it out pretty well yesterday. AC is still not up to par and I think there is a leak somewhere. Not surprised after sitting for nearly 3 years.

 

 

I've had an issue the past several days. Sputtering and misfiring at idle and light cruising. OBD2 MIL showed both bank 1 and 2 #1 O2 sensors (0132, 0152). I swapped in the one that I had as a spare into the passenger side and cleared the codes. No more MIL, but no change.
We've had a ton of rain here lately, and I did end up with water leaked into the floorboard from the engine harness grommet not being seated. This issue isn't related though since it was happening on the highway a few weeks ago, then went away. No MIL back then either. But now it's back.
Yesterday I swapped in the injectors/rail from the last engine to rule out at least that part of a fuel issue. Discovered the pcv hose had a big split under it at the manifold connection. I thought for sure that would be it, a big atmospheric leak could definitely do that.
nope.

when it's idling, it will stumble a few times a minute. When driving, it's loading up on part throttle, feels like it is being pulled back..then it breaks through and you take off. Dangerous to pull out around the beach here. Cruising I have to stay in 3rd or 4th, got to keep the revs up, or she stutters. On the highway, back when this first started, totally dry for days, cruising at 75mph and she started surging and hesitating..just a bit. But did it the whole way home.
Next day gone. Then it was fine until Friday..huge monsoon, had to drop the kiddo off at HS..non working AC..steamy 85*.. you get the picture. Nasty. I put few gal of fresh Shell 93 in on the way home and I got to work fixing that leak and verifying no electronics were affected.
I put a bottle of Heet in the tank also. Water in the gas tanks is very common here at the shore.

one more thing. When the hesitation is happening, it _smells_ like dead gas. That's why I went for the Heet. There are no cats on this car, but if you know of dead gas clogging cats up.. it's THAT stale gas smell. I've got 3/4 tank full now, at least 1/2 that is Shell 93.. same issues. Part throttle cruising it almost surges..crack the throttle wider..clears up. Thanks for the time.
I'm stumped.

 

If you're leaking through the main harness grommet I can almost guarantee the IPDM is wet too.

I think the gasoline thing isn't the issue, I think whatever is wet is just drying up naturally but I would definitely disassemble the IPDM and put it in a bag of rice to be sure. Rice is cheap, IPDM's are less cheap, same with the ECM.

Also, did you unsocket the ECM to verify there isn't a single drop of moisture in that harness? Personally if anything electronic gets wet I always just unsocket and remove the component, then bag it with rice for 12-24 hours. And if it was REALLY wet (if your floorboards were wet then it was definitely REALLY wet) then I take a heat gun to it on low heat and just warm the thing up good for 5-10 minutes to evaporate any water that's left.

 

thanks for the suggestions. I'm familiar with rice, used it many times. i hadnt thought of water travelling down the wires to the plug so i'll dig in there this weekend if the constant looming rain stops. i did fix the leak however, so shouldnt be anymore water getting in if that caused it.

forgive me, but i've heard the term IPDM, but what and where is it? Is it the fuse/relay block behind the battery? same vicinity but other side of the firewall from the ecu?

 

Yes, that's it. It's nearly under the battery. Which is why if the battery tray drain holes get plugged with debris (not uncommon) and you have a windshield cowl leak or lack an undertray, you end up with not just a wet IPDM, but a deep sea IPDM. And leads to many questions about what on earth were the Nissan designers thinking....

 

Front midship design for better weight balance, that's what they were thinking.

The LOCATION of the IPDM is the problem, it should have sat in front of the battery not behind it.. Or there should have been a flange off the firewall to keep water from pouring on top of it during a deluge.

 

okay I'm familiar with that. I pulled all the relays and fuses and cleaned the contacts on that after it sat for almost 3 yrs. Shouldn't the lid over it protect from water coming from above (cowl)?

 

Yes it SHOULD, however it's not a submersible gasket, it's basically got a NEMA 5 dust tight location rating. If you remove the battery and the battery tray you can get to the VERY bottom where there's a small drain that gets clogged up over time. When it's clogged up and it's really dumping water you can actually FILL the battery box and submerge the IPDM. That would require a NEMA 6P box for complete submersion.

What's equally as common is for the cover to not be fully seated and the cowl drains being clogged just pouring water over the top of the IPDM.

 

I had to drill a few holes In the plastic lower so it drains better. The worst. Battery box has the same issue.