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.
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
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I think the hard shifting is due to a faulty transmission control selonoid. As for the code p0102, looks like the mech, only changed what the code refered to , and not your actuall problem. I suspect a loose or broken connector or vacuum hose leak. A simple vacuum leak can throw all sorts of codes. Usually with very troublesome problems that are hard to find, most times a good option is to take it to your gmc/chevy dealer and have their team have a crack at it.
P0171 System too Lean (Bank 1) P0174 System too Lean (Bank 2) P2106 Throttle Actuator Control System - Forced Limited Power P0355 Ignition Coil "F" Primary/Secondary Circuit May be your car run normally now, but you must check and repair the fault in advance. ____________ MaxiDiag Elite MD802
Code 53 is for a problem with the heater in the O2 sensor for bank one sensor one. It could be something in the wiring or you could have a defective sensor.
System Too Lean (Bank 1) Symptoms include stalling at idle, rough idle, poor MPG, loss of power, high pitch sucking sound from the engine bay. This is typically caused by a vacuum leak. The most common cause is a hole in the elbow at the PCV valve. It may be hard to see so you'll want to pull it out to check it. Also look at the elbow that connects the PCV hose to the intake manifold. It can get a hole there as well. This is 90% caused by a vacuum leak and not the O2 sensor. Most people (ignorant ones) will just say it is the sensor because it set the code. That code is a good sensor reporting a lean condition. Just replacing the sensor without checking for other problems first would be like replacing an entire wire harness when a light goes out instead of checking the bulb and fuse first. Other causes can be a bad sensor, bad MAF, low fuel pressure, or an exhaust leak. To fix the elbows on the PCV valve you can pick up new ones from the HELP section of the local part store. The part numbers for the elbows from the Help section are: 47028 47029 The one that goes on the intake manifold fits the nipple on the manifold snugly. But, it doesn't fit snug on the line so you'll need to use a clamp on that part. The one on the PCV valve is a very tight fit at both ends. If you don't want to bother trying to rig this up, you can purchase a new line from Ford. The part number is: F8CZ-6853-CA.
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