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Background - 1992 Camaro 305 TPI, 700R4, basically stock....
Here's the situation. The car has been acting up the last few weeks and I'm almost at my wits end. When under acceleration she stumbles. Bad. The harder I push her the worse it feels. Going up hills is a nightmare. If I'm just cruseing (RPMs low) feels fine, but if i get in it, she stumbles and has a sever lack of power. Starts every time but stumbles under load. Kinda feels like a misfire but differant...
I first concidered that she was misfiring and it was ignition related but there's no CES light and the timing is correct. Most of the ignition system is new(ish) - plugs, wires, coil, distributor, ICM have all been replaced within the last year however I haven't pulled any plugs or the cap to see if there's anything obivious... yet.
I'm thinking it's fuel related. Here's why. Fuel pressure at the rail primes with key to on to 40psi like normal but then drops to 0 immidiatly. Still turns over like she should though. No long starts. I have since replaced the fuel pump and fuel filter AND the regulator diaphram but it didn't fix anything. No leaks in the fuel lines as far as I can tell. Car starts fine and idles at 30-32ish psi, shoots to 42psi with the regulator disconnected.
I think it's the injectors.... Car still has the stock Multec POSs and doesn't look like they've ever been replaced. And from what I've read, if one is stuck open I'd loose fuel pressure... So logically it's the injectors. Does that sound right? Or is the fuel pressure not holding at the rail normal and I should be looking at something else? EGR valve? TPS? Clogged Cat?
Maybe someone smarter than me can chime in here...
Here's the situation. The car has been acting up the last few weeks and I'm almost at my wits end. When under acceleration she stumbles. Bad. The harder I push her the worse it feels. Going up hills is a nightmare. If I'm just cruseing (RPMs low) feels fine, but if i get in it, she stumbles and has a sever lack of power. Starts every time but stumbles under load. Kinda feels like a misfire but differant...
I first concidered that she was misfiring and it was ignition related but there's no CES light and the timing is correct. Most of the ignition system is new(ish) - plugs, wires, coil, distributor, ICM have all been replaced within the last year however I haven't pulled any plugs or the cap to see if there's anything obivious... yet.
I'm thinking it's fuel related. Here's why. Fuel pressure at the rail primes with key to on to 40psi like normal but then drops to 0 immidiatly. Still turns over like she should though. No long starts. I have since replaced the fuel pump and fuel filter AND the regulator diaphram but it didn't fix anything. No leaks in the fuel lines as far as I can tell. Car starts fine and idles at 30-32ish psi, shoots to 42psi with the regulator disconnected.
I think it's the injectors.... Car still has the stock Multec POSs and doesn't look like they've ever been replaced. And from what I've read, if one is stuck open I'd loose fuel pressure... So logically it's the injectors. Does that sound right? Or is the fuel pressure not holding at the rail normal and I should be looking at something else? EGR valve? TPS? Clogged Cat?
Maybe someone smarter than me can chime in here...
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