Problem with my 1997,oldsmobile aurora,4.0
the "service engine soon" light is on.Sometimes it turns off but only
for about 5 miles and then comes on again. I used a computer reader and
I found 4 codes :
P0404,P0300,P1645 and P0404 again.
I put an injector cleaner
in my fuel and now I'm thinking to replace the EGR valve .
do you think that is going to solve my problem or what else should I do?
I'm also running out of time because in about 2 weeks I have to do the
emission test on my car.
I would really apreciate your advice.
thank you.
JK:
OK, lets go one at a time. First check ALL fuses underhood and in the fuse block under the rear
seat.
p0300 missfire. Need to find out which cylinder. You need to see live data for that. A code
reader cannot do that. 4.0l v8 are well know for corroded ignition coil towers. Just pull plug wires
off coils one at a time and look for corrosion on coil and wire. Also could be a buned plug wire at
the spark plug. The ones in the back are usually the culpret.
p0404 is egr pointle open position errer. The pcm(computer) is not seeing the correct feedback
position. Either egr is bad, or just full of carbon. Could try to remove valve, tap on the ground to
clean out any carbon. or use compressed air. since it came up twice, sounds like it is current
and history code.
p1645 is the evap system purge control valve circuit. Possible bad solenoid, or connection
problem. If you can use a volt/ohm meter, check for 12 volts at pink wire to make sure you have
correct voltage in.
The problem is; how long have these or some been there, or did they all come at the same time.
If happened after radiator replacement, then would suspect a harness got moved or pulled
causing a loose connection.
Aside from all these things, some normal places of poor connection/broken wires is the harness
going into the firewall below and toward the pass. side of the master cylinder. Clear all codes
and grab and move that and other harness to see if that causes the light to come on. The egr
wires, evap. solenoid wires, and injector wires all go in that harness and travel under the throttle
body. It is possible that these are all or some related. That was a common problem area.
If you are familiar with auto repair, could do some of these things yorself, if not, would suggest a
good repair facility, since there are several things, different systems having problems. Over the
years have had any one of these parts go bad (egr valve, purge solenoid, coils, wires, plugs,
injectors)Let me know if i can be of more assistance.
Back
the "service engine soon" light is on.Sometimes it turns off but only
for about 5 miles and then comes on again. I used a computer reader and
I found 4 codes :
P0404,P0300,P1645 and P0404 again.
I put an injector cleaner
in my fuel and now I'm thinking to replace the EGR valve .
do you think that is going to solve my problem or what else should I do?
I'm also running out of time because in about 2 weeks I have to do the
emission test on my car.
I would really apreciate your advice.
thank you.
JK:
OK, lets go one at a time. First check ALL fuses underhood and in the fuse block under the rear
seat.
p0300 missfire. Need to find out which cylinder. You need to see live data for that. A code
reader cannot do that. 4.0l v8 are well know for corroded ignition coil towers. Just pull plug wires
off coils one at a time and look for corrosion on coil and wire. Also could be a buned plug wire at
the spark plug. The ones in the back are usually the culpret.
p0404 is egr pointle open position errer. The pcm(computer) is not seeing the correct feedback
position. Either egr is bad, or just full of carbon. Could try to remove valve, tap on the ground to
clean out any carbon. or use compressed air. since it came up twice, sounds like it is current
and history code.
p1645 is the evap system purge control valve circuit. Possible bad solenoid, or connection
problem. If you can use a volt/ohm meter, check for 12 volts at pink wire to make sure you have
correct voltage in.
The problem is; how long have these or some been there, or did they all come at the same time.
If happened after radiator replacement, then would suspect a harness got moved or pulled
causing a loose connection.
Aside from all these things, some normal places of poor connection/broken wires is the harness
going into the firewall below and toward the pass. side of the master cylinder. Clear all codes
and grab and move that and other harness to see if that causes the light to come on. The egr
wires, evap. solenoid wires, and injector wires all go in that harness and travel under the throttle
body. It is possible that these are all or some related. That was a common problem area.
If you are familiar with auto repair, could do some of these things yorself, if not, would suggest a
good repair facility, since there are several things, different systems having problems. Over the
years have had any one of these parts go bad (egr valve, purge solenoid, coils, wires, plugs,
injectors)Let me know if i can be of more assistance.
Back
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Oldsmobile Aurora OBD2 scan codes p0404 p0300 p1645 p0404