help with new setup
help with new setup Ok so i just installed a lunati 60122 camshaft and has a tune from ion at madtuner but when it starts it will idle for a couple seconds and it will die. turn it back on and gave it throttle till about 4k and will completely shuts off. any one have any suggestions on what to check. thanks.
Have you checked your fuel pressure from your fuel rail yet? May not be getting the fuel it needs. It could be something as simple as the fuel filter. Mine did that about 2yrs ago. It ws just the filter.
Is all this happening on the first start up after the cam install? Have you gone over all the electrical connectors? Ion's pretty sharp with the tune and it's good you had it done with the cam change. Hows it run when it runs.....normal or rough?
ya i had no fuel issues with my last cam set up.. fuel filter has little over 1k miles on it. but i'm going to check the pressure. and it has somewhat of a smooth idle but cant really tell since it doesn't stay on long enough. maybe stays on a good 6 seconds then completely dies.
Sounds like your fuel pump is not running once the engine starts, works ok to prime not working in run. I think the fuel pump circuit is enabled through the low oil press switch. Do you have fp when the engine is running? For testing the fuel pump there is a 1 pin/wire connector that sticks out of the wire harness in the area of the passenger side hood hinge/ ac evaporator. If you run 12v directly to this connector it bypasses the normal fp circuit and runs the pump direct
http://shbox.com/1/fuel_pump_prime.jpg
Thanks for pic Shoebox.
http://shbox.com/1/fuel_pump_prime.jpg
Thanks for pic Shoebox.
Last edited by guppymech; Aug 12, 2012 at 02:34 AM.
Sounds like your fuel pump is not running once the engine starts, works ok to prime not working in run. I think the fuel pump circuit is enabled through the low oil press switch. Do you have fp when the engine is running? For testing the fuel pump there is a 1 pin/wire connector that sticks out of the wire harness in the area of the passenger side hood hinge/ ac evaporator. If you run 12v directly to this connector it bypasses the normal fp circuit and runs the pump direct
http://shbox.com/1/fuel_pump_prime.jpg
Thanks for pic Shoebox.
http://shbox.com/1/fuel_pump_prime.jpg
Thanks for pic Shoebox.
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ok i did the connection and the car stood ran like a champ.. so what does it mean. i need a new pump or what? could i drive it like that temporary or would it damage something? and thanks for helping me out bro..
You don't need a new fuel pump. Something is up with the power to the pump with the ignition switch in the 'run' position. Try searching the web for f-bodies with fp inop in run position issues. I'm at work now but when I get home (9:00pm pst) I'll look in my '94 factory service manual and post up what I can find, hopefully the info will apply to your '97.
Glad I could help and that the cam change runs good.
Glad I could help and that the cam change runs good.
You don't need a new fuel pump. Something is up with the power to the pump with the ignition switch in the 'run' position. Try searching the web for f-bodies with fp inop in run position issues. I'm at work now but when I get home (9:00pm pst) I'll look in my '94 factory service manual and post up what I can find, hopefully the info will apply to your '97.
Glad I could help and that the cam change runs good.
Glad I could help and that the cam change runs good.
ive been searching all morning. some people say it could just be the fuel pump relay since the pump turns on when direct power is connected and my fuel filter is new. hope its a easy fix.. anyone else have ideas???
The pcm controls the fuel pump relay. If the relay turns on to prime the rails then the relay works ok. The problem is the pcm isn't activating the fp relay in the key 'on' position.
Read this for more info on possible causes:
http://shbox.com/1/pass_key.html
Read this for more info on possible causes:
http://shbox.com/1/pass_key.html
Description of the fuel pump/pcm operation from my '94 GM service manual, verbatim.
"When the ignition switch is turned to the 'on' position (before engaging starter), the pcm energizes the fuel pump relay for two seconds, causing the fuel pump to pressurize the fuel system. If the pcm does not receive ignition reference pulses (engine cranking or running) within two seconds, it shuts 'off' the fuel pump relay, causing the fuel pump to stop.
As a backup system to the fuel pump relay, the fuel pump also can be energized by the fuel pump and engine oil pressure indicator switch. The switch has two internal circuits. One operates the oil pressure indicator or gage in the instrument cluster, and the other is a normally open switch which closes when oil pressure reaches about 4 psi. If the fuel pump relay fails, the fuel pump and engine oil pressure indicator switch will run the fuel pump."
As you can see there are two paths that can power the fuel pump (at least on my '94) but I cannot find support of this description of the oil press sw part of the system in the wireing diagrams.
"When the ignition switch is turned to the 'on' position (before engaging starter), the pcm energizes the fuel pump relay for two seconds, causing the fuel pump to pressurize the fuel system. If the pcm does not receive ignition reference pulses (engine cranking or running) within two seconds, it shuts 'off' the fuel pump relay, causing the fuel pump to stop.
As a backup system to the fuel pump relay, the fuel pump also can be energized by the fuel pump and engine oil pressure indicator switch. The switch has two internal circuits. One operates the oil pressure indicator or gage in the instrument cluster, and the other is a normally open switch which closes when oil pressure reaches about 4 psi. If the fuel pump relay fails, the fuel pump and engine oil pressure indicator switch will run the fuel pump."
As you can see there are two paths that can power the fuel pump (at least on my '94) but I cannot find support of this description of the oil press sw part of the system in the wireing diagrams.
Last edited by guppymech; Aug 12, 2012 at 11:00 PM.
It's time to start troubleshooting, don't just throw parts at it.
