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I have a 1997 Monte Carlo with a 3L V6. It has 90,000 miles on it and it studders went it starts, sometimes it doesn't start without clicking the key on and off 7-8 times. I have changed the fuel filter and checked the fuel pressure on the rail. With the key on engine off the reading is 26psi and with the key on engine running the pressure is 44psi. I know the first pressure is too low but is it caused by the fuel pump or pressure regulator or something like the computer sensing another problem causing it to happen?

Optional Information:
1997 Chevrolet Monte Carlo 3L

Already Tried:
fuel filter fuel pressure test

Customer (name blocked for privacy)

Status: Closed Value: $30

I dont think this is a fuel system problem. The fuel pressure reading you have provided are good. The 26psi reading is a bit low, but I doubt this is the cause.

Have you tried turning the key to the ON position and leave it there for about 10 seconds then try to start it? if not, try this, and let me know what happens.

also, when you do have the car started, jiggle the key(play with it a bit), and tell me if the car stays on or turns off.

Also, does the clicking of the key and the studdering also happen when the engine is warm? or have you not tried this? if not, try it, and let me know of that too.

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Reply to 32roadster's Post: I paused after turning the key on and then started it but it barely went up to a grand then quit, retried and it started like it should. Jiggling the key does not affect it.

OK, it is a fuel issue.

If fuel system pressure is not at specifications, the fuel injectors will not inject the correct amount of fuel when the computer system is in open loop.

If the pressure is not too far off(your case), the computer will adjust the air/fuel mixture after the system begins closed loop operation. The vehicle will have a cold driveability problem that will disappear when it is warm. (exactly whats happening with your vehicle)

I dont think the fuel pump is the culprit(but it is possible).

I would suggest that you change the fuel pressure regulator before changing the pump. Fuel pressure regulators usually fail by causing pressure that is too low rather then high, but in your case, you have kinda both. 44 psi is a bit high from the manufacturers specs. The fuel pressure should drop to 28-32 psi with the engine at idle. This is due to the lower manifold pressure.

hope this helps, if you need more help, let me know.

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