WON'T START WHEN IT'S COLD

2003 Pontiac Grand Am

Tiny

clyn96

December, 11, 2010 AT 4:32 PM

I have a 2003 grand am. Just had the fuel pump replaced and the filter as well. Now it's cold out and the car won't start. It cranks great, very strong, but it won't start. We replaced the fuel regulator, still won't start. But in putting starter fluid in the throttle, it starts right up. And now it's going to be near 40 today so it runs like a champ until freezes again. We're getting frustrated and don't know what else to look at. Please Help!

FOUND 51583 RELATED QUESTIONS

6 Answers

Tiny

JDL

December, 11, 2010 AT 4:41 PM

When the problem occurs, use a gage and check fuel pressure, key on, engine off. Also, key on or engine cranking, the pump receives battery voltage. Engine running, the pump receives alternator voltage, there is a difference. Do you use a block heater?

Tiny

clyn96

December, 11, 2010 AT 5:48 PM

Hi there.
No block heater here. We checked the fuel pressure early this morning however, and it measured in at 50#. We just checked it a good 3 hours later, car not running, and it's holding still at 40#
The other part was. In adding that starting fluid to the throttle, car started without hesitation, and continues to run.

Tiny

clyn96

December, 11, 2010 AT 5:51 PM

No block heater here.
We did however check the fuel pressure this morning at it came in at 50lbs. In checking it a good 3 hours later, it's holding steady at 40lbs?
Otherwise, the only other thing that will get it to start and stay, is that starter fluid in the throttle. No hesitation, and very strong.

Tiny

JDL

December, 11, 2010 AT 6:29 PM

Did you check pressure, key on engine off, without starter fluid? If that checks out, do you have an injector pulse, engine cranking, no starter fluid.

Tiny

clyn96

December, 11, 2010 AT 6:52 PM

The pressure is good, and the pulse is good.

Tiny

JDL

December, 12, 2010 AT 3:38 PM

Doesn't make sense to me?

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