g35 coupe start problem

[apm285]

Hi guys,

Battery went flat a few days ago, battery is about 6 years old as it is an 03 model. Battery cells were gone.

Had the battery replaced. Went to the gas station to fill up about 3 miles down the road. Locked the car then unlocked. Went to start the car and the rpm's went up as normal then dropped which lead the car to turn off. Oil, battery and engine light came on. Second attempt same symptoms. Third attempt turned on however this time the rpm completely dropped just above 0 then all of the sudden went back to 700rpm drove off as car was running. On the third attempt it almost sounded like the car wanted to turn off. Got home locked the car left it locked for about an hour, i again attempted to turn the car on same thing engine turned on, rpm dropped all the way and turned off.

Please help my auto electrician does not know what is wrong with the car. Its an import and was not sold locally in Australia. Basically he has never worked on my car before.

Thankyou very much Yianni

[G_whizz]

Could be a fuel pump?

You need 3 things

SparkFuelCompression

Good luck and I'm sure someone else may chime in.

[marlin29311]

Could be a bad battery....or underpowered. Did you make sure to get a new battery with the same amount or more cold cranking amps? Is the new battery a better/similar type? Using an underpowered battery could cause issues with starting and the electrical systems, as well as hurt the alternator as well.

[biggie]

Would say fuel or air. May be some kind of idle air control, though I'm not to familiar with VQs when it comes to that.

[apm285]

Yea its the same battery, had to order it specially as the battery is an abnormal size. I attempted to start the car when it was warm.

The ecu was reset during the swap i reckon that the ecu has to be taught, there is instuctions on how to do this in the tech page.

What do you guys reckon. Ill give it a go and get back to you.

Thanks

[joe603]

If you had the original battery, you have to make sure the connectors are clean when you replace it. Pull the negative connector, then the positive and clean the connectors with a battery terminal cleaner. Put the positive back on first, then the negative.

[pfarmer]

Hi guys,

Battery went flat a few days ago, battery is about 6 years old as it is an 03 model. Battery cells were gone.

Had the battery replaced. Went to the gas station to fill up about 3 miles down the road. Locked the car then unlocked. Went to start the car and the rpm's went up as normal then dropped which lead the car to turn off. Oil, battery and engine light came on. Second attempt same symptoms. Third attempt turned on however this time the rpm completely dropped just above 0 then all of the sudden went back to 700rpm drove off as car was running. On the third attempt it almost sounded like the car wanted to turn off. Got home locked the car left it locked for about an hour, i again attempted to turn the car on same thing engine turned on, rpm dropped all the way and turned off.

Please help my auto electrician does not know what is wrong with the car. Its an import and was not sold locally in Australia. Basically he has never worked on my car before.

Thankyou very much Yianni

How is the output from your alternator? What is your current battery voltage? On my Chrysler this is very important. I can have the battery up to enough to start the car but the car will die instantly if it is not high enough to keep it running which seems a little odd to me but that is what it does. If I charge it a little bit more it will start and continue running. On that car it seems to be about 11 volts or so.

I found this out when I purchase a battery charger with a jumper option. If I tried to start it with a dead battery as sonn as the starter engages for a short time the charger will back out of the picture. The car spun up to what appears to be a high enough rpm to continue running but it instantly dies.

Perry

[apm285]

Hi Perry,

All components were tested including the alternator which puts out enough power to charge the battery.

You see the symptoms dont occur on cold start. It only happens when the car is warm where the rpm range is low on start up, the car either stalls or is about to stall and regains its rev range. It shakes when it is about to stall obviously because it goes well bellow the 500rpm range.

Hmmmmm, i reckon its something to do with reprogramming the ecu, because it has been completely reset. It needs to relearn, Nissan must need to plug their software up and program it.

[pfarmer]

Hi Perry,

All components were tested including the alternator which puts out enough power to charge the battery.

You see the symptoms dont occur on cold start. It only happens when the car is warm where the rpm range is low on start up, the car either stalls or is about to stall and regains its rev range. It shakes when it is about to stall obviously because it goes well bellow the 500rpm range.

Hmmmmm, i reckon its something to do with reprogramming the ecu, because it has been completely reset. It needs to relearn, Nissan must need to plug their software up and program it.

I would lean that direction as well as long as nothing was compromised due to the battery going dead. Was the car sitting for a long period of time before it you found out the battery was dead?

Nissan must need to make the system go back to a default setting that is sufficient to make the vehicle operate satisfactory if a battery simply going dead can have such a drastic effect.

Perry

[apm285]

The battery went dead but it still had some charge in it as i was jump started with one of those booster packs, it started instantly. Battery was original, i can understand it going dead. The car has only done 30,000miles in 6 years lol it doesnt get driven much. Probably on its way over from Japan they sit on those ships for months.

[pfarmer]

The battery went dead but it still had some charge in it as i was jump started with one of those booster packs, it started instantly. Battery was original, i can understand it going dead. The car has only done 30,000miles in 6 years lol it doesnt get driven much. Probably on its way over from Japan they sit on those ships for months.

My son has been having a problem with his Volvo starting when hot. On his it appears to be that the throttle body sits above a cross over between the two banks on his V6. If you open the throttle just a little bit and then try to start the car after releasing it the car starts (and runs normally). If you do not and the car is hot it may not start.

I don't know on a 'G' if vapor lock is possible but what you describe I have seen on some much older cars (like 50s to early 60s) especially GM products with V8s.

Perry

[telcoman]

My son has been having a problem with his Volvo starting when hot. On his it appears to be that the throttle body sits above a cross over between the two banks on his V6. If you open the throttle just a little bit and then try to start the car after releasing it the car starts (and runs normally). If you do not and the car is hot it may not start.

I don't know on a 'G' if vapor lock is possible but what you describe I have seen on some much older cars (like 50s to early 60s) especially GM products with V8s.

Perry

My 1940 Pontiac also suffered from vapor lock. I once picked up a date on a hot summer night in Queens, NY. A few of the neighbors were sitting outside on their front porches watching. After repeated cranking the car failed to start. I had to ask her father for a rag soaked with cold water. I opened the hood and wrapped the cold rag around the gas line where it entered the carburetor for a couple of minutes. The car ten restarted, off we went and we had a nice time.

After repeated calls she never agreed to a second date.

Telcoman

[pfarmer]

My 1940 Pontiac also suffered from vapor lock. I once picked up a date on a hot summer night in Queens, NY. A few of the neighbors were sitting outside on their front porches watching. After repeated cranking the car failed to start. I had to ask her father for a rag soaked with cold water. I opened the hood and wrapped the cold rag around the gas line where it entered the carburetor for a couple of minutes. The car ten restarted, off we went and we had a nice time.

After repeated calls she never agreed to a second date.

Telcoman

Had the same problem but it had something to do with playing the 'Fish Cheer' on the 8 track.

Perry