Replaced engine on my 99 GC, now I'm getting codes

EGR solenoid is inside the EGR valve assembly
Have a look at this video.

How to Change EGR Valve on 7 4L Vortec Chevy Engine Step by Step Guide

Hope it helps.

This diagnostic trouble code (DTC) is a generic powertrain code.... Basically this means that an oxygen sensor in bank 1 has detected a lean condition (too much oxygen in the exhaust).On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1

wow no reponse and a perfect question, with year and sub model,wow.
the FSM is on line, lets look it up
97 GC aka, ZJ car.

http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

i click emissions chapter, PSF page 7 see it? i do.
its there, see it? p0351 requires a series of tests to find true cause
human intervention. for sure. like all DTCs do.
its called diagnosis.

bad ign coil, or wire to it cut,or corroded, etc
coil 1 fails at max dwell, (means turned on) primaryside fail,
which engine, ???????????

read chapter igntion, see 4L and 5.2L engines, v8?

it covers the tests of spark tests, 1 by one.
got spark>?

Hi, I know from my past experiances the spark plug wires at the boot ends than slide onto the sparkplugs usually over time short out due to the metal tubes that protect the sparkplugs from heat kind of ark across from the metal tube through the plug boot causing an error code. Sometimes in the dark you can actually see them arking at the tube on the engine, and also hear a crackling noise. As to the code for the O2 sensor that's a normal wear and tear item that may need replaced. As all vehicle age over time electrical connections, and things have issues develop and cause havick with sensors and computers in these vehicles too.


As with the 441 code and then the other code for the O2 sensor showing up may mean both O2 sensors are going bad if your system has 2 sensors in the exhaust, usually one before the cat converter and one behind it. A lot of this also is due to what gasoline you use in the vehicle over time. Lower octane gas may be what is causing things to act up.

Hi!..I had the same problem with my wife's car. 99 vw jetta 2.0l. I had the crankshaft sensor replaced. The car runs fine now and better! Good Luck!!!

Since your check engine light is on, it is telling you that the computer generated an error code. You can take it to any auto parts store and they will read the code for you - usually for free. That will give you some place to start looking for the problem.

PO 134 = 02 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 1 SENSOR1)
PO 153 =02 SENSOR CIRCUIT SLOW RESPONSE (BANK 2 SENSOR 1)
PO 154 =02 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 2 SENSOR 1)
PO 155= 02 SENSOR HEATER CIRCUIT MALFUNCTION (BANK 2 SENSOR 1)
PO 171= SYSTEM TOO LEAN (BANK 1)
PO 174= SYSTEM TOO LEAN (BANK 2)
I WOULD SAY YOU HAVE FAULTY OXYGEN SENSORS CAUSING THE ENGINE TO RUN TOO LEAN REPLACE THEM AND YOU SHOULD BE BACK IN BUISNESS

Is this an"E"or an "X" engine code? 8th diget in the vehicle identification tag, title. The designated code generally will fit that same code for all the years that it was produced.

Check/change transfer case fluid and check the wire connection to it.

p0300 is a random misfire. A scanner will need to tell the primary cyls that have problems. A (qualified) repair shop will need to check it. Could be from vac leaks, to fuel pressure, to spark problems????/