Question about 1997 Chevrolet C1500

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I have a 97 Silverado that has rough idle, loss of power and is throwing codes P0171, P0300 and 1345. Changed a lot of parts to no avail. Help!

I replaced the CTS, MAP sensor, both O2 sensors, new cap and rotor, wires and plugs. Replaced fuel filter, new multiport injection unit, cleaned MAF, EGR and Idle air control valve as well. Right bank cat came apart so I cut the cat out and welded in a "test" pipe and replaced muffler as well. Multiple tanks of gas and sea foam as well. Distributor is a 3 year old Accel billetech for Vortec V-8's. Economy shot down. Now the torque converter lockup isn't engaging either. I originally was doing a tune-up with new plugs, wires, cap & rotor. Truck ran fine for a day and a half then like someone flipped a switch, the problems started.

Posted by bigblock540 on


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SOURCE: I keep getting code p0420. I replaced 2 cats, all

are you running regular gas or not you should be running special unleaded fuel

Posted on Jul 01, 2009



  • 8 Answers

SOURCE: I keep getting code p0420. I replaced 2 cats, all

P0420 code is usually a sign of s weak fuel pump, and needs to be replaced. Also if you replace the pump and still get that code, check your fuel lines back by the tank and make sure that they are not pinched or smashed. this will also give the same code due to restricted fuel pressure, on the ruturn or supply line........ Good Luck

Posted on Oct 08, 2010


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