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Old 10-16-2011, 09:45 PM   #1
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94 z28 runs but sputters in traffic

I wrecked my 97z so i bought a 94z body and installed my engine PCM and trans in the 94.The car starts right up.When I drive it say accross town it will act ok on the freeway and everything but as Im exiting the freeway it will start missing and then eventully die.Now if I wait for about 45 minutes to an hour it will start back up missing and so on but I can drive it a little futher.Now here is whats puzzling me if I bleed the fuel rail right after it stops or whatever it will start back up. I changed all the orings on the injectors.Im only getting 20psi from the pump I also bought a new fuel pressure regulator.As long as im on the freeway it drive good no missing at all.When i give it throttle the psi goes lower from about 22-20.Seems to me me like im getting air in the systems some how.I noticed that the two orings the connects the two rails seemed kinda big but there was no problem when the motor was in the 97z.HELP!
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Old 10-16-2011, 11:11 PM   #2
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Replace the fuel filter.
Check the pressure and if still low replace the fuel pump.
The pressure should be 40 to 44 psi.
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Old 10-17-2011, 01:14 AM   #3
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Mine did the same it was the fuel pump, when you do replace it DO NOT get one from autozone I've went through three. Get an acdelco or walbro if you can....
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Old 10-20-2011, 08:39 PM   #4
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Quote:
Originally Posted by NavyVet
Replace the fuel filter.
Check the pressure and if still low replace the fuel pump.
The pressure should be 40 to 44 psi.
How do you check the pressure? Sorry op

Covert's 97 3.8 v6
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Old 10-20-2011, 09:45 PM   #5
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Quote:
Originally Posted by Covert 909 View Post
How do you check the pressure? Sorry op

Covert's 97 3.8 v6
Use a fuel pressure gauge with a very long hose, attached to the schraeder valve at the fuel rail. Run the hose up to the wiper cowl so that it rests there when the hood is closed, and close the hood enough so that it latches but won't pinch the line or pop open when driving and move it a few feet or onto the street and back. You want to position the gauge so that you can see it when driving. At least, that's if you want to check fuel pressure under load.
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Old 10-20-2011, 09:49 PM   #6
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Quote:
Originally Posted by ZexGX

Use a fuel pressure gauge with a very long hose, attached to the schraeder valve at the fuel rail. Run the hose up to the wiper cowl so that it rests there when the hood is closed, and close the hood enough so that it latches but won't pinch the line or pop open when driving and move it a few feet or onto the street and back. You want to position the gauge so that you can see it when driving. At least, that's if you want to check fuel pressure under load.
Geez sounds difficult lol gotta look up this valve of which you speak.

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Old 10-20-2011, 10:19 PM   #7
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Originally Posted by Covert 909 View Post
Geez sounds difficult lol gotta look up this valve of which you speak.

Covert's 97 3.8 v6
It's covered by a plastic screw-on cap on the fuel rail. It's like a valve stem on a tire, but on the fuel rail.
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Old 10-20-2011, 10:58 PM   #8
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Quote:
Originally Posted by ZexGX
It's covered by a plastic screw-on cap on the fuel rail. It's like a valve stem on a tire, but on the fuel rail.
Ok thanks.

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