Boost pressure solenoids

[juicegonzalez93]

I have a problem when i start up the car its sputters/acts as if it wants to turn off. . Had a guy tell me it was something with the turbo acting up some pressure solenoids and it was 2 I can't seem to find part numbers or what they actually look like. . If anyone can help ?

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[Protection]

Is the check engine light on? If so what codes are you getting. The boost pressure diagnoses sounds suspect to me. Since you are just idling you aren't boosting. Did you check all your hoses for a boost leak? Unplug the MAF and see if it idles fine. If so, you likely have a leak somewhere.


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[juicegonzalez93]

Is the check engine light on? If so what codes are you getting. The boost pressure diagnoses sounds suspect to me. Since you are just idling you aren't boosting. Did you check all your hoses for a boost leak? Unplug the MAF and see if it idles fine. If so, you likely have a leak somewhere.


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Yes i do have a check engine light on, im unsure of what codes i have, i had a friend check it out for me and said i needed the pressure solenoids. . And said that's why i have a rough idle when i crank the car, i give it some gas and it runs fine . . At times it starts up fine. And i checked for vacuum leaks and i did switch out a check valve that looked beat up.

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[Protection]

So try unplugging the MAF and see if it idles fine. I doubt it is your N75 valve, but here is a diagram so you can find it




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[blitz2190]

its not the n75 valve as that can fail and you'll just have 5 psi when trying to boost so it wont affect idle. its most likely something to do with some of those codes you'll need to pull or you have a large air leak or a bad maf. do as Protection said and start it with the maf unplugged and report back.

[juicegonzalez93]

its not the n75 valve as that can fail and you'll just have 5 psi when trying to boost so it wont affect idle. its most likely something to do with some of those codes you'll need to pull or you have a large air leak or a bad maf. do as Protection said and start it with the maf unplugged and report back.

I'll do that tomorrow after work and see how it goes. . The guy that checked it for me was referring to N249 and N112 so idk if that could actually be the cause of my problem. . I'll ask him to pull the codes for me.

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[jpulll]

N249 shouldn't affect normal idle. the N249 is the solenoid which controls the Diverter valve. the computer sends a vacuum signal under certain conditions which opens the diverter valve. there is a lot of talk about deleting this but it is better to remain under normal function. main function is to protect the turbo from compressor wheel back spin and to regulate partial throttle which makes the car feel less jerky from on/off boost.

The n112 solenoid controls the SAI pump on your cold starts. Again this is controlled under certain conditions, main one being humidity. It sends a vacuum signal which opens the Combi valve at the back of the engine so more air can be directly pushed from basically your air filter straight through your exhaust valves into the cat converter. Main function is to heat the cat converter up, emissions related. this operation runs for 30seconds to a minute.

this problem you are having...is it during this initial 30 second high idle startup? if it still idles poorly even after this, you shouldn't even consider the solenoids being an issue. I say either MAF issue, boost leak, SJP blown out, or you need a tune up (spark plugs, front o2 sensor). go to autozone or better yet a dealership, have them scan the codes and post them on here.


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[juicegonzalez93]

So the codes i got were misfire on #1 and #2 cylinder. . And PO171 Leak . .

I recently bought new coils and spark plugs are about 2 months old. .

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[juicegonzalez93]

N249 shouldn't affect normal idle. the N249 is the solenoid which controls the Diverter valve. the computer sends a vacuum signal under certain conditions which opens the diverter valve. there is a lot of talk about deleting this but it is better to remain under normal function. main function is to protect the turbo from compressor wheel back spin and to regulate partial throttle which makes the car feel less jerky from on/off boost.

The n112 solenoid controls the SAI pump on your cold starts. Again this is controlled under certain conditions, main one being humidity. It sends a vacuum signal which opens the Combi valve at the back of the engine so more air can be directly pushed from basically your air filter straight through your exhaust valves into the cat converter. Main function is to heat the cat converter up, emissions related. this operation runs for 30seconds to a minute.

this problem you are having...is it during this initial 30 second high idle startup? if it still idles poorly even after this, you shouldn't even consider the solenoids being an issue. I say either MAF issue, boost leak, SJP blown out, or you need a tune up (spark plugs, front o2 sensor). go to autozone or better yet a dealership, have them scan the codes and post them on here.


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I unplugged the MAF and there was no change on the car. . I switched the Coils around and nothing. . Maybe spark plugs? . . During hurricane Mathew i got caught in some what high waters. . Could have water damaged anything through the intercooler?

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[juicegonzalez93]

If anyone can give me some feed back on that , thanks!

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[blitz2190]

so you switched the coils cleared the codes and they came back on #1 and #2?

[juicegonzalez93]

I didn't cleared the codes , i jus switched the coils. . But switching them didn't change anything on how the car started up

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