2000 Pontiac won't start

Tiny
LIZZYMARKS
  • MEMBER
  • 2000 PONTIAC
Car will turn over but won't start. I have replaced the crankshaft position sensor, the ignition control module, the fuel pressure regulator, the fuel filer and still nothing. Fuel pump is running so don't think it is that because there is gas and spark. What else could it be? Were told the oxygen sensor is lazy but would this cause the car not to start?
Sunday, April 16th, 2006 AT 10:44 AM

17 Replies

Tiny
LOSONE
  • MECHANIC
  • 1,616 POSTS
What kind of pontiac, engine type, tranny and miles on the vehicle. Does it have a key with a computer chip? Also are you getting spark? Do you have fuel pressure? Can you hear the fuel pump run when yu turn on the key? Let me know
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Sunday, April 16th, 2006 AT 1:02 PM
Tiny
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2000 pontiac sunfire 2.2 liter. Yes fuel pump is running. Has spark. About 45,000 miles. No chip. If you leave key on for half hr it will run for about 2 seconds.
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Sunday, April 16th, 2006 AT 1:09 PM
Tiny
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Hummm. In that car the fuel pump relay comes on for 3-5 seconds and primes the system. The circuit then goes through the oil presure switch to the fuel pump. This prevents engine damage with no oil pressure.

There is a red wire with a green connection that is a fuel pump test wire. It is somewhere in the engine compartment and is easy to find. If you apply 12V to that wire and the car runs then the fuel pump is OK and the problem is somewhere in the relay to oil pressure sw to the tank. The fuel pmp wire is light gray from the oil pressure sw to the tank.

My best guess if the oil pressure sw. Good luck
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Sunday, April 16th, 2006 AT 2:37 PM
Tiny
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Tkanks, I'll try that! Do you know where the switch is located
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Sunday, April 16th, 2006 AT 2:48 PM
Tiny
LOSONE
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It is usually near the oil filter. Good Luck
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Sunday, April 16th, 2006 AT 4:11 PM
Tiny
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Ok tried that didn't work. Anything else you can think of? Thanks
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Sunday, April 16th, 2006 AT 8:31 PM
Tiny
LOSONE
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Did u find the red lead to test the fuel pump?
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Sunday, April 16th, 2006 AT 8:36 PM
Tiny
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No couldn't find it.
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Sunday, April 16th, 2006 AT 8:56 PM
Tiny
LOSONE
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You need to see if you have fuel pressure and if the injectors are pulsing from the computer. Let me know
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Monday, April 17th, 2006 AT 3:52 PM
Tiny
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There is no way to check. I had someone over to hook up a pressure checker and was unable to do it. But he thinks it is the fuel pump. Was hoping it would be anything but that.
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Wednesday, April 19th, 2006 AT 11:41 AM
Tiny
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Could it be an oxygen sensor?
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Saturday, April 22nd, 2006 AT 8:09 AM
Tiny
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Nope, the O2 sensor monitors the amount of oxygen in the exhaust and control the air mixture. A remote possibility is a coolant temp sensor. It is near the T-stat and has two wires. I can't help only guess because I don't have enough info to analyze the problem even with 40+ years of experience.
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Saturday, April 22nd, 2006 AT 8:37 AM
Tiny
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Thanks. I know I am frustrated with this too. Wish that fuel pressure checker would of worked.
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Saturday, April 22nd, 2006 AT 8:38 AM
Tiny
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Got it going! You'll never guess how. We put $15 worth of gas in it. It had a quarter tank of gas but read somewhere that if a car runs out of gas that it will need that much to prime it up again. Wish our 17yr old would of told us she ran it out of gas it would of saved alot of $$ and wasted time. But wanted to say thank you for all your help.
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+1
Saturday, April 22nd, 2006 AT 1:27 PM
Tiny
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Now the brakes are hanging up! Put new rotor, pads and caliper on but still the right passenger side is hanging up.
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Thursday, April 27th, 2006 AT 3:16 PM
Tiny
SWEET TART
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I had the same problem with my Pontiac, try changing the rubber brake hose. They get old and will collapse wich causes the brakes to lock.
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Thursday, April 27th, 2006 AT 4:56 PM
Tiny
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Ok will try that this weekend. Will let you know. Thanks
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Thursday, April 27th, 2006 AT 7:32 PM

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