89 Isuzu Pickup Loping Idle


Old 09-12-06, 11:57 AM
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89 Isuzu Pickup Loping Idle

I recently had my fuel pump replaced and the truck ran good. After 3 weeks of running excellent the trucks idle is very low and rough. I checked the fuel filter and tried cleaning the carburetor but could not find the problem. Any suggestions? Thank you for your help.

1989 Isuzu pickup 2.3L engine
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Old 09-13-06, 04:35 AM
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Talking lope

Unfortunately on older vehicles you replace a part to revitalize an aging system and the older parts of the system can't keep up. Assuming your ignition and timing system are properly maintained you're left with emissions. Your EGR valve is fairly easy to clean. Your idle speed stabilizer is a part which tends to fail on 80 model vehicles that have their pumps changed. There is also the Ide Air Control valve or IAC. You also have the throttle positioning sensor which can cause this. Assuming your timing is correct and your plugs, cap , rotor and wires are all functioning correctly. I would check all of these first then go to the fuel pressure regulator and injectors.

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