Molotov7

Need some advice,before Everything runs ok,starts everytime it cranked,uninstalled faulty oxygen sensor due to correct part searching ..hereafter got the right part but then after installing a new NTK oxygen sensor,i have to give a bit of gas pedal whenever the car has been shutdown after 15-40minutes (starts up then stalled).
Cold first early starts ok...immediate startup after shutdown is ok...Everything is ok except the above mentioned explanation.

Example:-

Start - warmup - 30km drive - shutdown - immediate startup ok - shutdown again -
15-40min off - start again - STALLED - then press abit of gas then its starts up fine.

Any help will be appreciated..thanks.

satch

iTrader: (1)

Do you still have the old sensor? If so, then reinstall and see if things change for the better. I don't believe this sensor is used during idle or for starting for that matter. Use the advanced search function and there are threads detailing how to check the sensor. And a faulty FPR will cause hot start problems as well as not running the engine to temp and shutting it off before so. To check the FPR you can run the engine for a while and then turn the engine off and pull the vacuum hose off of the FPR and see if there is the presence of fuel which there should not be.

Molotov7

1st of all thanks n appreciated for your quick reply sir.

Sadly,already did throw away the old sensor,
However..i can just try to unplug/disconnect the o2 sensor and see what's happen next.because before putting a new one (without o2 sensor in) it's all starts/run fine excepts some fuel thirst quenched.

Was it possibly the:-
1)tps out of setting
2)water thermo sensor is dying (back of the waterpump)

Thanks.

satch

iTrader: (1)

Could be the FPR, injectors,tired engine. Could also be the thermosensor or not allowing the engine to heat up properly before shutting it down. Not sure of the quality differnces between an aftermarket sensor in question as compared to the factory sensor but the price difference is rather large.

I don't believe a TPS sensor is really relied on to start the car but I could be wrong.

Molotov7

Whats bothering me is the problem occurs after installing the o2 sensor....others than that is left untouched,engines seems still running strong & healty..did do the poor man compression check with an even 3 strong bouncing psshhh pssshh in front & rear housing before changing the spark plugs.now it's been 1000km ++ already on the ngk spark plugs..

Also did the deflooding procedure with no success...all it need is just a lil bit press of gas as i'm mentioned.

Thanks once again sir...any more suggestions will be appreciated.

lduley

iTrader: (1)

I thought the o2 sensor was only for crusing, i wouldn't think it would be giving you fits starting unless its telling the computer to dump so much fuel its flooding it out when you shut it off. I know they aren't cheap, but maybe replace the o2 again just to be silly?

Does it smell like its running rich? Worse than what they normally do lol

What does it do if you unplug it and leave it? Same thing?

Molotov7

Haven't got time to try to unplug it now since i'm a lil bit busy at the moment with my brother wedding functions.

But i will try it out (as all of you've suggested,really appreciated it) as soon as this functions are done (6 more days to go).

any more suggestions will to be taken considerably.

Molotov7

About that rich smell things....yeah...it's almost still the same smell as before(without o2 on)...but after,a lil bit less fumes & smokes...

Mines are using custom 3inch dp (o2 sensor 2inch away from turbo) straight thru (deleted catalytic) till dual 2.5inch Y pipe going to dual catback exhaust.

RXSpeed16

iTrader: (41)

Check the wiring to the BAC valve. Mine has recently stopped working and it acts somewhat like the hot start problem. It's in the same general area as the O2 sensor, so it may have gotten knocked loose during the recent work.

satch

iTrader: (1)

The intake air temperature sensor also plays a role w/respect to hot starts.

Molotov7

Got some spare times today...by trying unplugging the o2 connector.
Cranked her up...as usual...engine starts fine...idling is good...
After warm-up,Got 82 celsius water temp reading...went off for a drive.
Normal traffic city condition & speed...a/c on all the way...
Stopped by a shop for some grocery shopping needs.water temp reading is 92 ish celsius.parked it then engine off(my turbo timer always set to 2minute).
40min after..back into the car.finger crossed...Cranked her up...tadaaaaa!!
Starts fine with a little rough idle...seems like it wanted to stalled but no but it's kinda ...so i'm giving it just a little bitsy of gas pedal...water temp reading is around 83ish celsius.
Went straight back to home then.

So.....what do y'all thinks?

Any suggestions?
Thanks

satch

iTrader: (1)

You could continue to leave the oxygen sensor unplugged and see if the car returns to acting normal. If it does then replug the sensor back in and see if things become problematic again.

Molotov7

Ok,i tried as all yours suggestions,checking the bac wiring,done.
Unplugging the o2 connector,done.
Then connecting it again,done.
Magically....no more hotstart symptoms!!only a little rough idle after hotstart it...but no need to be gassed,the idle leveling itself.
Actually what i'm doing After i'm reconnecting the o2 connector,start her up till normal engine temp (82),then took it for a drive,after reaching 88degree celsius water temp,droping to 2nd gear... blasting till 7k rpm for a 3sec revved......then back to normal grandma speed again.
So finger crossed as she'll be sleeping again since it's just for a weekend grandma spirit drive..haha
Thanks for all your helps...really appreciate it.

Any inputs will be taken,thanks y'all.