hard to start when engine is hot

**Grimsin** · 06-24-2013

So 2 days ago I went into town to run some errands and when I got back to the car after my first errand I cranked it over, it tried to start then died.. then I cranked it again just turned over and but didnt start.. so then I held the starter and cranked it for a good 5 seconds then it sputtered like it wanted me to gas it so I held the starter till it fired up normally and ran fine, thought it was kinds of weird. Went to my second errand and got to my car roughly half hour later and the car had the same issue..
So got to my last errand. I popped the hood to let it cool off cause it was really hot day and thought maybe it has to do something with it being such a hot day. Came back a hour later, engine was cooled off a bit, cranked it and fired up...weird, car runs perfect once it starts
My mods are in my sig. I have 180 thermostat and tuned for it so car only warms up qtr ways.

And yesterday driving the check engine light came on,so I pulled over, checked the fluids and all of them are top notch so not too sure...

I will be getting the code pulled today and will keep you guys updated

**dsmuts** · 06-24-2013

Let us know the code and we'll point you the right way.

**Grimsin** · 06-24-2013

P0141 is the code, something to do with bank 1 02 sensor..? Don't think it has to do with my starting issue..which I tried to show the starting issue to the guy cause it was just as hot.. but it started fine.
I did reset the code so we will see if it pops up again..
Anyone give a good description of the code it will be appreciated

**ericspecullaas** · 06-24-2013

sounds like vapor lock. the only fix for that was wooden close pin lines. had a 37 caddliac that did that and that was the cure. but these cars shouldnt suffer from this.

edit: i think it may be the fuel pump getting to hot??

**Below Average Joe** · 06-24-2013

P0141 PONTIAC O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 2 OBDII Engine Light Trouble Code | Engine-Codes.com

**Grimsin** · 06-24-2013

Thats it thx for the link, so is that my 02 sensor after the cat?

**Below Average Joe** · 06-24-2013

yes

**Grimsin** · 06-24-2013

Ok cool nothing to worry about. We reset the light so I'll find out if it was just a one time occurance
And about my hot start issue I found a thread that leads me to cleaning the tb and maf
http://www.grandprixforums.net/3800-v6-hot-start-issue-42708.html

**nik12937** · 06-25-2013

If you have an 04+ with a drive by wire (electronic) throttle body, then definitely clean the throttle plate just for extra security. The carbon that builds up on the back can make your throttle unresponsive to begin with, and in my case it got so dirty that my throttle plate would stick and make me stall out ONLY on warm starts.

**Grimsin** · 06-25-2013

I have 05Impalabut they have a series 2 motor so I have the cable throttle bodybut you never know it may be sticking also so I will be taking apart and cleaning it like I did last year

**Grimsin** · 06-27-2013

Engine light came back on so looks like I need a new rear 02 sensor

**Grimsin** · 06-27-2013

Anyone else concur that replacing the 02 sensor behind the cat will fix the p0141 issue I'm having?

**Below Average Joe** · 06-27-2013

I would say it wouldn't hurt to try, but check you wires first to see it they are cracked or broken too.

**Grimsin** · 06-27-2013

Wires look allright, so I just ordered a new o2 sensor. I thought might make the car run rich or something but performance and mpg are the same

**dsmuts** · 06-27-2013

Rear o2 won't hurt anything if it's bad.

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