2001 Noise and Code P0410 YIPEE!

[Murphster05]

Hello all,

My 2001 Silverado has started showing the ever annoying P0410 code. Also, at cold start up it makes a sound that is very reminiscent of rod knock but that goes away in a minute after it warms up, is there a way that the two are related? How does one approach diagnosing/fixing the P0410 problem, as simply clearing it and going on with my life hasn't worked any of the three times I have tried it... Maybe time 4 is the charm :-)

Thanks for any help or thoughts!

[MT-2500]

Down in S-10 how to there is some info on code 410

http://www.automotiveforums.com/vbul...d.php?t=564664

How many miles and what engine?
What kind of oil and oil filters are you using?

Can you knock the noise out by pulling one plug wire at a time?

[Murphster05]

Sadly I have to get my oil changed at Jiffy Lube / an oil change place, do it every 3000/ when the light comes on and tells me to. 5.3 litre engine. The noise only lasts for about 30 seconds at start up and then is gone... haven't tried pulling wires at all but I guess that could be a next step? Will have to wait until the morning when it is really cold again.

[MT-2500]

Cheap filters will give some start up knocks.
Also cold start up piston slap.
Several TSB's out there on that


Ask for a AC Delco or Wix oil fiter next change.

How many miles on it and how long has it been doing it.

[Murphster05]

Been doing it for a while, close to 8 months I would bet. 130K miles on it. I will ask for the more premium filter next time. Didn't know that an oil filter could cause this.

[j cAT]

Originally Posted by Murphster05

Hello all,

My 2001 Silverado has started showing the ever annoying P0410 code. Also, at cold start up it makes a sound that is very reminiscent of rod knock but that goes away in a minute after it warms up, is there a way that the two are related? How does one approach diagnosing/fixing the P0410 problem, as simply clearing it and going on with my life hasn't worked any of the three times I have tried it... Maybe time 4 is the charm :-)

Thanks for any help or thoughts!

Is this the v6 engine ? check with a vacuum guage for vacuum at the air solenoid. check to see if you get power to the air pump when the air pump relay is energized.

this is usually no power/loss of ground that causes pump to run..
could also be a bad solenoid valve..

air pump maxifuse 30Amp blown ..also check IGN E fuse 10Amp..

when power is at the air pump the solenoid energizes shuttling the vacuum. grounding of the 86 pin of the pump relay will energize this relay then pump must run...or jumper the relay pins 30 and 87 these are the switch contacts..

my guess is the air pump is n/g...about that time..

[j cAT]

Originally Posted by Murphster05

Been doing it for a while, close to 8 months I would bet. 130K miles on it. I will ask for the more premium filter next time. Didn't know that an oil filter could cause this.

the noise at cold start is probably lifter noise..these 5.3L engines are sensitive to deposits ...also as mentioned a good oil filter with a high quality drain back valve will reduce this noise...if at idle when cold starting it immediately makes ticking noises this would be the lifters.

my preference is the wix and the purolator PLUS oil filters.
also synthetic oil changed every 8,ooomi..so far my 2000 5.3L is still perfect at 125,ooomi.

try adding 4-5 OZ of marvel mystery oil to engine oil. if this reduces or eliminates the noise then this would be your lifters and the use of a low quality oil filter passing large sized particles getting hung up in the lifter..the lifter must hold oil ..if after a few hours the oil drains out you then get the noise..


back in 2000 I had this problem no more now...

[Murphster05]

No, this is the V8 engine, not the 6. I will check the air pump maxi fuse and IGN E, are those under hood or under dash fuses? Which pins are you talking about? I am not even really sure where this pump is located under the engine but could certainly ground out the pins if I knew where they were. Thanks!

[Murphster05]

Originally Posted by j cAT

the noise at cold start is probably lifter noise..these 5.3L engines are sensitive to deposits ...also as mentioned a good oil filter with a high quality drain back valve will reduce this noise...if at idle when cold starting it immediately makes ticking noises this would be the lifters.

my preference is the wix and the purolator PLUS oil filters.
also synthetic oil changed every 8,ooomi..so far my 2000 5.3L is still perfect at 125,ooomi.

try adding 4-5 OZ of marvel mystery oil to engine oil. if this reduces or eliminates the noise then this would be your lifters and the use of a low quality oil filter passing large sized particles getting hung up in the lifter..the lifter must hold oil ..if after a few hours the oil drains out you then get the noise..


back in 2000 I had this problem no more now...

Thanks, I will get some of the additive and see if that helps this problem also. I guess these are two completely unrelated problems that seem to just be happening at the same time!

[j cAT]

Originally Posted by Murphster05

No, this is the V8 engine, not the 6. I will check the air pump maxi fuse and IGN E, are those under hood or under dash fuses? Which pins are you talking about? I am not even really sure where this pump is located under the engine but could certainly ground out the pins if I knew where they were. Thanks!

this pump in the 5.3L was not required in my state...but it is in the v6..
this is simply to reduce pollution when first starting..,

the relay should be at the pump..check those fuses...but I have replaced the pumps...with no pump action the O2 sensor output will not change as expected this then throws this code..

[Murphster05]

where is the pump and what does it look like? the fuses are easy enough to check and I will do that, but I don't know where to find this pump?

[j cAT]

Originally Posted by Murphster05

where is the pump and what does it look like? the fuses are easy enough to check and I will do that, but I don't know where to find this pump?

in the firewall corner passengerside...under the fender fire wall support arm..

[Murphster05]

Originally Posted by j cAT

when power is at the air pump the solenoid energizes shuttling the vacuum. grounding of the 86 pin of the pump relay will energize this relay then pump must run...or jumper the relay pins 30 and 87 these are the switch contacts..

where are the pins to this relay you are talking about? Are those at the pump or are they in the engine electrical center? are pins 30 86 and 87 all part of the same relay?

[j cAT]

Originally Posted by Murphster05

where are the pins to this relay you are talking about? Are those at the pump or are they in the engine electrical center? are pins 30 86 and 87 all part of the same relay?

the relay should be mounted AT pump..
along with the other mentioned controlling componets

[Murphster05]

added the marvel mystery oil, see if the noise goes away in the next couple of days, now that I think about it I believe it started to occur after I stopped changing my oil... I hate oil change places.

Checked both fuses and they are good sadly. Start looking at the air pump and relays in the morning.

Thanks!

Edit: Pulled the hose where the pump sends air to the T (one to each header) and it was blowing strong at start up...