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P0410 & P0411

jcpr996
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jcpr996 Member

jcpr996

Posted
Posted

Hello everyone:

1 - Got these yesterday morning then cleared codes car drove fine all day. Searched here and found out about the secondary injection system. Checked 40 amp fuse and relay and both are fine. Started the car cold last night SAI pump started just fine and no CEL.

2 - This morning started the car SAI pump started ran for about 30 secs. and shut down no CEL. As soon as I drove off the CEL came on.

3 - My question is. Do I now go to the air and electric change over valves? My CEL comes on after the pump shuts down.

Searched and it seems it has happened to a few people. TIA.........

bmohr Member

bmohr

Posted
Posted

yes, this situation seemed very consistent with my experiences with the air and electric changeover valves. Blower came on startup, fan stopped like it should after 30 secs or so, drove a mile or so and code would come on afterwards. Replaced these valves and it remedied the situation.

jcpr996 Member

jcpr996

Posted
  • Author
Posted (edited)

Thanks... Ordered those 2 and will replace. Will also replace belt and idlers that are making a nasty sound. How bad was the alternator removal for you? TIA......

Also have any of you guys replaced the check valve after the air changeover valve??

Edited by jcpr996
bmohr Member

bmohr

Posted
Posted

Alternator..can be a pain in the ***...a recent member ran into difficulties with tapping the bushing that holds the alternator in place. Have to be a bit firm and deliberate and you will prevail. And yes, replace both electric and air changeover valves while you have everything out. One note of caution..be very careful while working because you can break some plastic parts...little black hoses and also the nipple connectors that attach various runs of coolant into/out of the water pump. The parts are cheap but its a pain waiting for another obscure part to arrive to drive your car again when breaking stuff:) Best of luck!

jcpr996 Member

jcpr996

Posted
  • Author
Posted

thanks b:

Yes Im gonna replace those 2 valves but there is another one after the air-changeover valve. Has no vacuum lines and goes into the exhaust manifold guess ill have to leave that one alone. I know about the coolant hoses already broke the plastic part once got a nice shower of coolant. Ill tackle this and let you know how it turns out. Hope the alternator goes ok gonna start spraying some wd-40 a few days before working in there. Will let you know how it turns out...

jcpr996 Member

jcpr996

Posted
  • Author
Posted

thanks b:

Yes Im gonna replace those 2 valves but there is another one after the air-changeover valve. Has no vacuum lines and goes into the exhaust manifold guess ill have to leave that one alone. I know about the coolant hoses already broke the plastic part once got a nice shower of coolant. Ill tackle this and let you know how it turns out. Hope the alternator goes ok gonna start spraying some wd-40 a few days before working in there. Will let you know how it turns out...

jcpr996 Member

jcpr996

Posted
  • Author
Posted

Thanks to everyone for their help with this. Got it done yesterday and check engine is gone. The alternator removal was the worst part that bushing just didn't budge so with a little force and hammering alternator came out. When out hammered the hell out of that bushing and it budged just enough for it to go back in. installed air and electric change over valves and all is good. thankyou.gif

  • 1 month later...
baco84 Member

baco84

Posted
Posted

i did the same job on my 2002 c4 but the valve behind the alt stays on, so after the sai pump turns off, its pumpin air back into the sai pump and souns like its misfiring, code comes on right away. need help pls.

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