1992 Geo Prizm missing

1992 GEO PRIZM
150,000 MILES • 4 CYL • FWD • AUTOMATIC
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PRIZM25
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i have a 1992 geo prizm LSI, fuel injected. at idle up to about 2500 RPMs it is missing or only riuuing on three cylnders, i replaced the fuel injectors, oxygen sexsor, and fuel filter, i have also tested the compression and it is fine.
Oct 19, 2008 at 2:27 PM
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LEGITIMATE007
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your gonna have to check your spark ,fuel and or your knock sensor.
Oct 19, 2008 at 3:21 PM
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LEGITIMATE007
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https://www.2carpros.com/car_repair_video/test_fuel_injection_pressure.htm
Oct 19, 2008 at 3:22 PM
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LEGITIMATE007
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https://www.2carpros.com/car_repair_video/test_engine_ignition_system.htm
Oct 19, 2008 at 3:24 PM
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PRIZM25
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We've already checked all those things. Just today (10/19) we disassembled the distributor, spark plug wires, fuel system, oxygen sensor amd the onboard computer. The problem continues! Any other ideas?
Oct 19, 2008 at 5:49 PM
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LEGITIMATE007
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Did you look for vacuum leaks or pinched vacuum hoses?
Oct 22, 2008 at 9:08 PM
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PRIZM25
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yes, i was wondering if the charcole canister could cause this?
Oct 23, 2008 at 4:36 PM