05 Balt bogging down.No power.

[56pontiac]

Originally Posted by tomj76

If you can check the fuel pressure while driving, or get your hands on a OBDII scanner that can read active data, you can check to be sure that you're not losing fuel pressure while running.

A fuel pressure gauge taped in the right position so you can read it while driving (with the hood down and secure) should let you see if the pressure is maintained under load. A scan tool will show high fuel trim if the pressure drops.

Thanks tomj76 I have to check the fuel pressure. I have an OBDII scanner,one of thsoe cheap $49.00 units. Every time I check the FAULT CODES, I get a different code(s). But almost every time I get RANDOM ENGINE MISFIRE.It also had about an emissions leak (large) which I assume is because I have the catalytic converter disconnected. Last time it said to CHECK GAS CAP.So I went and took it off and re-tightened it.I cleared the gas cap message and it was OK all the while it ran. But went out the other day and started it and the gas cap warning came on again.I do have the fuel pump hooked up direct.When I changed fuel pumps I found that the pump wasn't getting any power.So I ran a wire back and spliced it in. It ran fine for about 4,000 miles after the head gasket/fuel pump replacement.

[tomj76]

>I have an OBDII scanner,one of thsoe cheap $49.00 units.

That will read your codes, but to get dynamic data you need one of the more expensive ones. A fuel pressure gauge will give a direct reading so you'll know if there is a fuel issue, or if you should look elsewhere for the problem.

>It also had about an emissions leak (large) which I assume is because I have the catalytic converter disconnected.
If you run without a cat, you'll get codes. The computer can tell the difference. Did you remove it because it failed, or for some other reason?

>Last time it said to CHECK GAS CAP
That's a EVAP system error. The vehicle has a fairly sophisticated system to make sure that gasoline vapor aren't escaping for the fuel supply.

I sounds like you're running a fairly heavliy modified setup there.

[consultIII]

wondering if this all started after the fuel pump wiring repair? The system is design to run at constant pressure with the regulator located in the fuel pump module but is ecm controlled through the fuel pump relay. Not completly sure if it would matter or not but wonder if the wiring repair took the ecm out of fuel control?

Fuel pressure test, as per other postings, is needed. spec is 50-60 psi running and shouldn't drop more than 5psi in 1 minute when turned off

The ecm, if your still looking, is located near the left side of the rad.

[56pontiac]

Originally Posted by consultIII

wondering if this all started after the fuel pump wiring repair? The system is design to run at constant pressure with the regulator located in the fuel pump module but is ecm controlled through the fuel pump relay. Not completly sure if it would matter or not but wonder if the wiring repair took the ecm out of fuel control?

Fuel pressure test, as per other postings, is needed. spec is 50-60 psi running and shouldn't drop more than 5psi in 1 minute when turned off

The ecm, if your still looking, is located near the left side of the rad.

The problem started about 4,000 miles after the fuel pump.I guess the wiring repair could have done that.That gives me another thing to look at.Thanks.