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maxima dies at startup then runs fine
11-26-2017, 11:54 PM
Post: #21
RE: maxima dies at startup then runs fine
Long weekend with the maxima. Went out yesterday morning and turned the key and it fired up and immediately died. has done it consistently every morning this last week. So instead of giving it throttle and making it run, I just turned the key back off and left it in the non running condition.

I proceeded to install the new iacv (without the shield). While doing that, I decided to clean the maf just for good measure and everything went south...Did something stupid that I knew better of and broke the maf. So off to the parts store to get new $142 sensor. While there decided to go ahead and pick up a fuel pressure gauge because I just felt really pessimistic about the iac working! another $50, but I guess that's an investment for the future.

Got the new maf and iacv installed, turned the key and no change, car fired up and died. I hooked up the new pressure gauge and when I turn key on/engine off it reads right in line with what the book specs are. So now I give it the throttle to keep engine running and my pressure is perfectly within idling specs. Since I gave it throttle and got it going it will now start and run fine, so I shut it off and checked fuel pressure through all three steps- key on, idle, and pull vacuum off regulator. Fuel pump is good.

So at that point I was hoping maybe the computer and other sensors needed a few minutes to "recognize" the new iac and maf and that's why it stayed in the "die after start mode" and that maybe things would be good in morning. I should have left everything alone at that point and waited till next morning to test those repairs, but instead I decided to check out the pcv.

The pcv was fairly gummed up and I could not hear it rattle when I shook it, so I cleaned it up good and got the spring working again. let the car sit about 5 hours and It started and ran fine. Left it overnight, and this morning it started like it was new. didn't drive it any today and just went out to test it, (12 hours and temperature drop) and it once again starts up and runs like a champ.

It's good that it has started and ran right three times in a row now, maybe the problem is solved. But, was it the iacv? or was it the pcv? or a combination of those and the maf? I like to think it was not the pcv alone because even though it was seemingly stuck, the engine was warm when I pulled it out so I don't think it was stuck when cold and then not after engine warming up. I guess mainly I just like to think that maybe I didn't waste money on new iacv, like I did on the maf I broke! LOL.

So hopefully tomorrow morning the car will keep running good. I just wish it had not been a $400 fix and not know exactly which part was the culprit. At least I have a new pressure gauge now and I know the fuel pump is good, Ha- ha!
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11-27-2017, 06:59 AM
Post: #22
RE: maxima dies at startup then runs fine
Wow, that is a lot of money to spend and still not know what the culprit was! That is why I don't like making several repairs at once. I hate not knowing what really solved the problem. But at this point you will probably be happy if the problem "Is;" in fact, solved.

Thanks for the update. Please let us know if there are any new developments.

Thanks for using the forum,
Garner

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11-27-2017, 07:27 AM
Post: #23
RE: maxima dies at startup then runs fine
Started it up again just now, 5 am, 34 degrees. It started up, then for just a second the rpm's dropped a couple hundred and immediately went back up to 1200. 1200 is normal high idle, then will drop to 800 as engine warms.

It's good that it started and ran, but that slight hesitation this morning has me wondering. it didn't do that yesterday, but it is probably 15 degrees colder right now. Possible that Pcv needs replaced, rather than just cleaned? Over next day or two I may get a new propane canister for my torch and go over it for any vacuum leaks. But would a vacuum leak have any effect on the apparent cold weather trigger issue?
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11-27-2017, 02:29 PM
Post: #24
RE: maxima dies at startup then runs fine
Vacuum leaks could play a role but I would focus on cleaning the rest of the PCV system first,meaning the hose and connection ports.
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11-27-2017, 02:29 PM
Post: #25
RE: maxima dies at startup then runs fine
Vacuum leaks could play a role but I would focus on cleaning the rest of the PCV system first,meaning the hose and connection ports.
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