New member with tech issues

**dtodd** · 10-07-2014

Hello all,
My name is Darille and I am a freelance service tech, ( I run a below standard shop rates garage for people in need of repairs but can't afford shop or dealership rates). Basically I am an honest low cost alternative to regular shops and dealerships. Anyway I have a customer (college age kid from waaaay out of town) with a 2001 Grand Prix. 140k miles. It has a runability issue. Can someone please refer me to a search option here in the forum or the correct place to post my question. Thank you in advance for any and all help.

**Sven the Sexman** · 10-07-2014

Search is at the top of the screen hidden in the black...look for the magnifying glass.

**Scottydoggs** · 10-07-2014

search is hidden at the top of the page, its black on black, a bit hard to see.

you can post your question here if you like.

if its random stalling drivng down the road 99% of the time its a crank sensor, they rarely set a code either.

**dtodd** · 10-07-2014

The issue is the car starts, runs smooth for 5 to 10 seconds then dies flat. Fuel pressure fall off once the engine builds to proper vacuum level. When the fuel system is primed once it runs to 46 psi +/-. I'm thinking fuel pressure regulator but this girl can not afford for me to be wrong, I don't like to just throw parts at a car and hope that fixes the problem.

**dtodd** · 10-07-2014

And I did find the search tab, thank you.

**Scottydoggs** · 10-07-2014

is this a n/a or supercharged engine? year, model, miles?

n/a the fpr likes to fail. it will start and stall with cold starts. a filthy dirty TB can also cause this. the fpr's are rather cheap, around 25 bucks.

**BillBoost37** · 10-07-2014

SC'd before 2000 and it'll likely be the fuel pressure resistor.

Scott...where's that pic?

**dtodd** · 10-07-2014

The vehicle is an N/A 2001 Grand Prix with around 140K miles.

**Scottydoggs** · 10-07-2014

pretty sure the n/a engine has a vac line to the fpr. if so pull it off see if the line smells like gas. if it does the fpr is bad for sure.

**dtodd** · 10-07-2014

Would the evap canister purge valve have anything to do with it?

**BillBoost37** · 10-07-2014

Depends.. if you have a code for it.. you likely have a vacuum leak.

**Scottydoggs** · 10-07-2014

not likely. that would throw a code at least.

you can test that if you like, via smoke test and adding power to it to see if it opens and closes.

**dtodd** · 10-07-2014

There are no ecm codes right now. I will go with the FPR and see where that takes me. Thank you for the help.

**Scottydoggs** · 10-07-2014

id clean the TB too. it can also cause it to stall or run rough. be sure to remove the maf first, as you know im sure anything but maf cleaner hits the maf its as good as dead.

**dtodd** · 10-07-2014

Yup, this is the N/A model. Does it have a fuel pump resistor? If so I have read a couple of ways to diagnose it. It seems the symptoms are EXACTLY what I am having when others have detected a faulty resistor.

**BillBoost37** · 10-07-2014

No fuel pump resistor on NA's.

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