Okay so a month ago my 2007 350z with 107k miles gave me a low oil pressure light when i was warming up my car so i immediately went to go park it and realized it had a huge loss of power like a hesitation of sort and would only rev up to 1.5k or 2k rpms cant remember exactly... also would idle at 500 rpms sounded like it wanted to turn off. Some of the things i have done are changed spark plugs, pcv valve, oil pressure sender/sensor, and MAF sensor turned it on still nothing so now im in the timing cover replaced the gaskets and while im in here if anyone has had the same problem what are some thing i should be looking for while im in here besides the water pump and thermostat. Also reading through some of the threads i guess one of my big mistakes was moving my oil to 10w40 apparently its not really good so will now be only using mobile1 5w30 and 0w40. Would appreciate the help the car is my daily so ive been out of work :/

 

Welcome- the first thing to do is run a scan of your onboard diagnostic system. Diagnostic codes held in memory will provide some clues as to why your Z is in limp mode.

 

I used a scanner maybe its because it was a cheap one but i didnt get any any codes, as for the low oil pressure light it only comes on till i rev the car but as im doing the gallery gaskets what other things could cause the problem or as usual i forgot to mention theres no under-splashguard for my car and the day before this all happened i was driving through some serious puddles and almost hydroplaned at least 3-4 times. then the next day is when all this happened should i check for something underneath if so what. Once i put everything back together involving the timing cover i hope it will solve it if not ill use a different scan tool to see if anything pops up then if not its gonna be back to self diagnosing. any more info on anything is helpful

 

Does your car still have a CEL on? It could be water intrusion has triggered something, so checking and replacing the splash pan would be a good first step.

 

No CEL has not given me one just the low oil pressure warning after I checked the no splashguard the first thing I changed was the Oil Sender but I will be getting a Splashguard or skidplate from here on not sure if the skid plate will protect it from the water but ill check also gaskets were chipped, cracked, and split but anything else i should give a try before putting everything back together appreciate it need my daily back

 

If it were I, I would change the oil pump. Cheap insurance and I really would not like to go back into the engine to change it latter.
Good luck with the problem.

 

Yea my friends are trying to convince me to change it and im looking at threads and videos and people keep saying the oil pump doesn't usually mess up its usually the gaskets especially for HR's. Its my first time tackling all this but i think i can do it all again easier then before but do i want to no lol. The gaskets were pretty messed up so im gonna time it and put everything back and do the idle relearn and hope and pray it was just that and my car can idle smooth and fix the limp mode issue and mainly the OIL PRESSURE. Ill Given anUpdate when I can.

 

UPDATE: Okay so I havent had time to finish this thing up bc all of the rain but im wondering whats the possibility of an oil pump failure on this vq35hr ive already changed the which some parts of course was out of its housing but have not put it back together ive listed the symptoms im dealing with currently but ill say it again so it would usually idle at 0psi when it was working fine but now i have the low oil pressure light no CEL sounds like its rattling a little like it wants to turn off idles at 500rpms i can feel it struggling im pretty sure it went into limp mode bc their was hesitation on the throttle would only rev up to 1-1.5k rpms no overheating issues and now its just been sitting in my driveway since ive changed the gaskets was going to put everything back together but i dont want to put it back together to rip it all apart again and change the pump so any tips on what to do from here

 

sounds like oil gallery gasket to me

 

OP said he's doing the gaskets etc, however he did not say anything about the oil pump. Makes sense to me to do the pump while he is in there.
Good luck OP.

 

He didn't specify which gaskets

 

Okay Update: I didn't change the oil pump because you need to take off not just the front but rear timing cover to put it in so i took a chance and only replaced the gaskets the car is no longer giving me oil pressure issues although idle is fluctuating between 1,300k to 2k rpms it is constant. Putting it in 1st gear i dont even need to press the gas to start moving because the rpm is constantly moving so i just slowly take off the clutch and im moving lol (i did the idle relearn nothing else) Also the car isnt telling me its overheating but i could definitely tell the engine is hot. Before i did all the work i made sure to disconnect the batterybecause thats what everyone told me. Any info you guys want to share im open ears i know ppl say they replace their TB or get a new ECU but i genuinely don't know. On top of all this the car gave me 10 codes i forgot to write all of them but some were P0507, P1233, P2101 and others but i just erased them to see how it would act... still the same, codes will pop up back tmrw im sure. Again any info would be greatly appreciated.

 

Sheesh- 10 codes popping up mean you've got several problems, some likely interrelated. I'm gonna say the OP needs to get his car to a good Nissan tech and start shelling out some diagnostic and repair time to get this Z back to baseline. Trying to DIY by posting on this (or any) board is a slow and difficult process.

 

Yea gonna call up a local mechanic that usually deals with Z's and G's and see what he thinks the overheating could be just airbubbles in the radiator or need a new thermostat/waterpump although the the unsteady rpms i have no idea. I've heard of people going to the nissan dealership although the stories i hear they just make you buy stuff that evidently does not solve the problem also the CEL has still no came up again im gonna start her up today drive around the block a couple time and see if they pop up again but yea i hope this issue gets resolved soon need my daily back ill keep you guys posted with any new info.

 

Quick little update: Going to take it into a shop soon bc its need more work than i thought. Need to diagnose if the throttle bodys are bad then decide whether to reprogram them or the ECU could be messed up which im reading a lot into that the 07 HR's ECU usually messes up and to just get one off a manual 08hr not to familiar with ECU so chime in. On top of all this ill be bleeding the coolant from my car bc it is heating up quite a bit i know there is a bleeder port on the right side just to the side of the throttle bodys so just wondering if all i need is to access the bleeder port to to bleed the coolant or do you guys recommend also buying the funnel for the radiator and burping it there. Also I see oil on valve cover so im assuming the gasket is also bad probably why i see a little bit of smoke coming from the engine bay maybe the oil drips onto a hot surface or what not so yea too much work/time for me to actually do it all so I will take into the shop where the guy usually deals with Z's and G's. Also forgot to mentions where would be the best sites to buy the valve cover gaskets Thnx

 

You can purchase directly from a Nissan dealer or OEM 350Z / G35 VQ35DE Valve Cover & Gasket Kit - Z1 Motorsports - Performance OEM and Aftermarket Engineered Parts Global Leader In 300ZX 350Z 370Z G35 G37 Q50 Q60

 

Update: took her to the shop to get the throttle bodys reprogrammed it didnt want to reprogram had to buy some TB from saccity didnt even installed them and they somehow reprogrammed the old ones that are still on the car so might return the ones i bought from saccity. After they finally got the idle back to its normal state it threw a low oil pressure light again and its boggling like it wants to turn off. so now im like wtf i the oil dipstick has maybe a quart or half a quart of oil could it be that it just needs some new oil and a filter which can be maybe clogged or could this be the oil pump any sugggestions to try im all for it. I already changed the oil gallery gaskets which i mean seemed to be working fine beside the whole idle fluctuating but now that its fixed now the oil pressure wants to **** with me again. again it has low oil but not sure if that would make the low oil pressure light turn on i think the he said the light turned on i honestly dont remember. asking for help here because im close to just either selling it to someone that actually wants to fix her or part out. right now im going to pick it up from the shop and tow it back to my place :/ . Would love some help.

 

Yes, low oil level can cause a low oil pressure light. Make sure the car has been off for 30 minutes when checking the oil level.

 

Okay i actually didnt know that but it makes sense honestly should be commons sense im just dumb asl. Appreciate it.

 

Current Update: I just picked up my car from the shop... somethings that they did was again program the throttle bodys (TB) that i bought after testing the old ones again and they didnt want to reprogram (old ones) the ones i bought from saccity was able to program. [Keep in mind the car did not want to stay on]. they checked the oil pressure and seems to be good found high resistance in the wiring, also cleaned the TB, topped off the oil because it was needed, now seems to have her power back, but they found the pcv system is still causing a slight high idle nothing major like it previously was (2k) now its between (1 to 1.3k) it could be something simple as replacing the little plastic thing hopefully. She has most if not all her power back I obviously didn't accelerate hard bc I just picked it up from the shop and need to put some gas. Im mainly keeping up with this post in hopes i can help someone out experiencing the same thing. But what are your guys thoughts on this so far and any tips on something i should check right now and things to keep an eye for, maintenance, or something to check after picking it up from the shop, etc. I appreciate all who has helped and who knows i might need more help soon hopefully HOPEFULLLLLY NOT