Mechanics

WENT FROM NO START TO HIGH REVING ON IT'S OWN!

1999 Oldsmobile Aurora • 177,000 miles

1999 Olds Aurora.
This car has had a problem with rough starting for months now. It often takes 10-15 seconds for the engine to start after turn over without giving it any gas.
Changed the fuel pump with a used one about 2 months ago.
Just changed the water pump and drove the car over 1500 miles on a trip. Got back drove it around town a bit and then it wouldn't start. It would just turn over. Before this the lights started going kinda wacky with the traction off and anti lock brake lights coming on.
After trying over and over to start it, sprayed carb cleaner in the air intake or at least down the hose from the air filter, and it got to right where it sounded like it was starting to start and then something popped and some smoke came out of the passenger side of the engine. Then tried some starter fluid sprayed in the same spot. It would start popping when it was starting to start. A small fire started right near the air filer.

Left it overnight. Tried to check security by locking and unlocking the door with the key. Still wouldn't start and battery was dying. Got a fuel pressure gauge but wasn't sure where to hook it up. Hooked it up at the port right above the fuel injectors on the opposite side of the engine as the Fuel Regulator. The gauge read zero with the key turned on. When pressing in the port no gas came out. Changed the fuel pressure regulator and changed the fuel pump (another used one). Had to jump the car at this point. It would continue to turn over but then when it was just about to start it kept popping. Thinking that was backfire in the intake. After doing this a few times, tried to turn it over while stepping on the gas. Pretty sure it started and was then lightly stepping on the gas trying to keep it going. It suddenly started reving on it's own with the RPM's jumping to the max and then back down over and over till shut key off. Tried two more times and each time it automatically jumped to Reving on it's own and had to shut it off at the key to get it to stop!
Not sure if we blew something w/the carb cleaner and starting fluid. Checked the throttle and it's not stuck.
Now when pressing on the port gas does come out.
Not sure where to go from here!
Avatar
Kmagenta
May 31, 2012.




Clean the idle air control valve and see what happens

Tiny
Rasmataz
May 31, 2012.
Haven't cleaned the idle air control valve yet. Got a code tester and it read P0101. Hooked up the fuel pressure gauge and it was still reading zero. With the car reving it it slowly climbed to 40. The battery died again and we jumped it and then threw it in drive and got it home but it wanted to go fast and had to ride the brakes the whole way. It wasn't shifting. The RPM's stayed put. Thinking about the fuel filter and throttle position sensor now.

Tiny
Kmagenta
Jun 1, 2012.
I know this was over a month ago however I recently had the same revving problem on my 97 Aurora with approx 178000miles after breaking down at roadside and having to replace my starter. While removing the intake manifold I had loosened some of the fuel injectors. All I had to do was "wiggle" (for lack of better terms)the fuel rail around a bit and pushed each fuel injector in to make sure it was seated properly back into place. Once I did that I then had the car running with no revving problem but then all of a sudden after two minutes car stalled at idle so back to the drawing board wiggling fuel injectors and voila. All the revving problems had been resolved. Not sure if you had messed with the fuel rail at all while trying to figure out where to use the fuel pressure gauge but it sounds nearly the same as what my Aurora was doing.
Also, when removing your fuel pressure regulator. A good indication of good fuel pressure would be if fuel wanted to spray out as you were removing it. Hope you got yours fixed by now. But if not, I'd check your fuel injectors to see if they somehow got damaged and check the o rings on them each has 2.

Tiny
Brecian
Jul 9, 2012.
Dunno if you fixed this problem-lets restart by checking the fuel pressure with a fuel pressure tester and comeback with the readings so that we can proceed on-we start here-Also do you have a check engine light?
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Tiny
Rasmataz
Jul 11, 2012.
Clean the MAF sensor with an electronic cleaner and see what happens

Tiny
Rasmataz
Jul 11, 2012.

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