Weird Start...

theMerchant said:
I m curious also with changing your battery chifx45, but please post your results like Andrew mentioned.
Im just skeptical because once your car starts, doesnt your alternator kick in to supply the proper amp/volt?!


im thinking it hesitates possibly due to you flooding the engine during the starts.

if your air filter is that dirty, I agree with others that it is a dirty TB.
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my FX was doing the same thing 2 years ago. i thought the same thing - maybe a tune-up was needed or the intake was dirty or the filter because of CAI. i was planning on doing some maintenance until i got in one day after work and it was dead lol. i jumped it and went and swapped the battery and it eliminated the hard start and rough initial idle. doing the same thing again now and almost didn't turn over this morning.

i'll post results once i swap the battery out again, but, that's why i was saying to swap the battery now. it isn't difficult to get to the TB, etc. but i don't believe it's necessary to even check it.
 
You know, I am wondering if my battery could be the culprit. A few weeks ago I got back from vacation and my FX had sat for a week, and the thing barely turned over though ran just fine the rest of the day. It sounded like a weak battery.

Might be good insurance anyway, I have never had a battery last longer than three years and I am on the original battery.

On the other hand, I know my intake filter is filthy but I keep putting it off due to lack of time. I have a two week break from school coming up so I hope to address this then.
 
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N2FX said:
Same symptoms with my 06. The TB has been replaced and the starting symptoms are back after a week or so. Subscribed.
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Wow... so there are similar problem among us 06 owners. I'll get around to looking and replacing things next week. My "busy" season is almost over and I won't have to work weekends anymore.

I suspect it is the battery. If I don't get lazy today, I'll pick one up and replace it and see if the symptoms continue.
 
probably as old as yours... I figured they would have checked that when they replaced the TB. My FX is going to the dealership next week. I'm gonna drop it off the night before so they can simulate the morning start up since it mainly happens when it sits for a bit (overnight or after work) I'm gonna have them check everything again.
 
What I do not understand is if the culprit is the battery, why is it only on the initial start of the day for most of us? Does the alternator provide just enough of a boost in the course of a day to have the engine start normally, and the battery "drains" to its insufficient strength overnight?

My '05 FX simply sounded very strained when trying to turn it over on a bad battery, but at the same time it would "struggle" for a few seconds once it actually fired up. Obviously it returned to normal after replacing the battery.

Guess I'll pick up a new battery on Monday. OEM or Interstate, or are they one in the same?
 
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N2FX said:
probably as old as yours... I figured they would have checked that when they replaced the TB. My FX is going to the dealership next week. I'm gonna drop it off the night before so they can simulate the morning start up since it mainly happens when it sits for a bit (overnight or after work) I'm gonna have them check everything again.
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Yup exactly the same for me. Only happens overnight or after the car sits for awhile.

---------- Post added at 09:58 AM ---------- Previous post was at 09:56 AM ----------

The only reason I initially mentioned battery was because my accord had a similar symptom couple of months back and it was due to battery. Well, it's a little different on the accord. My accord took quite a bit of cranking to get it started. The FX gets fired up fine, but it feels like it'll stall out.
 
Mongolian said:
Yup exactly the same for me. Only happens overnight or after the car sits for awhile.

---------- Post added at 09:58 AM ---------- Previous post was at 09:56 AM ----------

The only reason I initially mentioned battery was because my accord had a similar symptom couple of months back and it was due to battery. Well, it's a little different on the accord. My accord took quite a bit of cranking to get it started. The FX gets fired up fine, but it feels like it'll stall out.
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its interesting you say ... after it sits awhile/overnight . I think another member mentioned something about a bad fuel injector leaking...
 
Well, I put up a thread called "Ignition Problem". I had two problems: (1) an extremely long cranking before starting and (2) sluggish start in the morning. I had TB, fuel injections, and fuel pump replaced for free under the factory warranty. Now, my car starts right away, but it still has that sluggish start in the morning. I just can't figure out why. There was another member who was convinced that it was the battery and had it changed. However, his problem returned again! So, that is why I have some dobuts about the battery theory. I have the same question as GJBenn85. If it is the battery, why just in the morning? My typical battery problem experiences are that it is either dead or live, not dead or weak just in the morning for many weeks to months. My battery was checked by the dealer, and they said it was good to marginal. I haven't changed the battery for 3.5 years. This is weird and crazy. I never had problems like this with any other cars that I had owned.
 
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I just finished cleaning my TB along with an oil change, and shook out my filter. I think most of the rough idle upon start is gone. However, I can't seem to idle below 1250 RPM even when it's fairly warmed up. I will try again tomorrow though.
Also, I had to put my stock intake on because it seemed the vacuum hose had ripped out of the tube. I'm going to see how my repair worked and maybe order a new tube with a solid attachment. The rubber on mine seemed to have broken.
 
StuLax18 said:
I just finished cleaning my TB along with an oil change, and shook out my filter. I think most of the rough idle upon start is gone. However, I can't seem to idle below 1250 RPM even when it's fairly warmed up. I will try again tomorrow though.
Also, I had to put my stock intake on because it seemed the vacuum hose had ripped out of the tube. I'm going to see how my repair worked and maybe order a new tube with a solid attachment. The rubber on mine seemed to have broken.
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thats good you found a leaking tube.... as for the idle, do the TB Learn from teh DIY section.

IMO I dont think you have the same problems as these 06 peeps
 
Since some of us are talking about batteries, has anyone replaced their battery at the dealer with prorated discount? I know Infiniti OEM battery has a 7 yr warranty, but after 2 years, it has prorated cost for the owner. Obviously, my battery is not totally CAPUT, but I don't want to wait until it does. I got a voltmeter tonight since I want to check if the battery theory was right. Mine is reading 11.8V with my headlight ON before I start the car and 12.2V with my headlight OFF before I start the car. So, it is between low to medium depends on the headlight before I start the car. Does anyone know anything about the adequate voltage for starting FX?
 
hmm

sounds like an old problem I had before. Car would start up, then bog down and feel like the engine would choke off.......then you have to "manually" give it some gas to keep the rpm's up, then car seems to idle okay?

If so, could mean that your ecu need reprogramming!
 
Well, I tested my battery this morning after parking my car for more than 16 hours overnight. I got 11.73V with my headlight on before starting and 12.09V with my headlight off before starting (less than what I got last night). So, I started my car with the headlight off and it started right away without hesitation! Since I have my headlight on Auto, the headlight always turns on before I start the car in my garage. I'm wondering if my car's battery is too low to start right away without hesitation in the morning beacuse it's below 11.8V??? I'm going to test it out again tomorrow morning to see if my theory is correct...
 
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