1990 F250 Clogged Cat?
#1
#5
Unless the cat is completely stopped up, I don't think that sounds like a cat. Blocked cat will run fair at low rpm, low power but just won't make power. The honeycomb in the cat on my '90 F350 with efi 460 broke loose and got turned 90 deg. It ran ok below 45 mph but just would not develop any power. What kind of vacuum does it pull?
#6
so another sympton is that when you try to accelerate it boggs down and dies.
new plugs, wires, rotor, cap, throttle sensor, temp sensor, fuel pressure reg, timing chain, water pump, ICM, IAC. All new.
Fuel PSI at idle is 30, When trying to keep running its still around 30-35, when i take the vacume line off the fuel psi reg the psi jumps up to 40psi. so thats all ok.
Is there a way to check the ecm out of truck to tell if somthing is bad, or should i check it while its in the truck?
with the idle screw would that affect the acceleration when just stepping on the gas pedal. if i pump it really fast i can keep it running.
#7
Unless the cat is completely stopped up, I don't think that sounds like a cat. Blocked cat will run fair at low rpm, low power but just won't make power. The honeycomb in the cat on my '90 F350 with efi 460 broke loose and got turned 90 deg. It ran ok below 45 mph but just would not develop any power. What kind of vacuum does it pull?
Swaped my MAP from my mustang 5.0 and it ran great. Thaks for all the helpfull tips
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F250AZ
Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
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11-18-2015 01:36 PM