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Oldsmobile Forum: 2001 Alero no start wait a minuet and starts
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  #11  
Old 3 Days Ago
Cutlass350 Cutlass350 is offline
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Quote:
Originally Posted by ford_offroader View Post
This is what i got so far
running - 44psi
after shut off - 38psi
after 5 min of being off - 32psi
3 hours after shut off - 2psi
The most likely cause of that is from a bad fuel pressure regulator.
But, it could also be caused by:
a bad fuel pump
one or more bad injectors


C&C may be the winner at guess the cause.

First, try the following:
When starting the engine:
1) Turn key to "on", but not crank.
2) Leave it there for ~3 seconds. The pump cuts off if there's no rpm.
3) Turn the key to "off".
4) Wait 3 seconds

5) Turn key to "on", but not crank.
6) Leave it there for ~3 seconds. The pump cuts off if there's no rpm.
7) Turn the key to "off".
8) Wait 3 seconds

9) Try to start the engine normally.
By this time, the fuel pressure would be primed. It might be primed after the first try. But, it might not.

If that works, as I suspect it will, that confirms that the issue is the loss of fuel pressure.

Since the fuel pump and fuel pressure regulator have been replaced, and I'm assuming you don't see any fuel leaking on the ground, I'd suggest try replacing the injectors.

Or, you can live with doing the "prime the fuel pressure" dance.

Good Luck!
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  #12  
Old 1 Day Ago
ford_offroader ford_offroader is offline
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The injector balance test came out to the same on every injector. Scan tool primes the system to 50 psi and when you buzz each injector they all come out to 31 Psi. This is frustrating ! ! Maybe i got a bad FPR ? I have been having a lot of trouble with BWD parts went throw 6 oil sender units on a LB7 motor last week before i got a good one and got a bad multi-function switch as well from BWD.
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  #13  
Old 20 Hours Ago
Cutlass350 Cutlass350 is offline
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Quote:
Originally Posted by ford_offroader View Post
The injector balance test came out to the same on every injector. Scan tool primes the system to 50 psi and when you buzz each injector they all come out to 31 Psi. This is frustrating ! ! Maybe i got a bad FPR ? I have been having a lot of trouble with BWD parts went throw 6 oil sender units on a LB7 motor last week before i got a good one and got a bad multi-function switch as well from BWD.
In general, I say buy and use on GM OEM parts!
Yes, there is PLENTY of pure cr*p out there.
What's even worse, is that the counterfeit market for automotive markets is MASSIVE! I posted on here before, about fake hub parts being confiscated in Canada.

With my Achieva, I went through 4++ Crank Position Sensors before I bought one directly from the dealer. The other ones would fail in a few months.

Also with my Achieva, I bought (likely) counterfeit hubs from ebay. One lasted ~4months before it started making noise.
Again, I then bought hubs directly from the dealer.

The dealer bought CPS and hubs are now over 10 years old. No problems with either.

NOTE: Delphi/Delco is now outsourcing some replacement parts. So, you get cr*p!
I just had that problem with a Delphi fuel pump bought from Amazon (not a reseller).
The ^&*^*(* POS fuel pump assembly leaked from the tank pressure sensor on the top of the assembly. Even if Delphi doesn't make that sensor themselves, it still caused a leak on their POS fuel pump assembly.

Yup, sometimes you just can't win. :-)
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