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Buick Skylark Limited: My sons 1996 buick skylark starts then

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My sons 1996 buick skylark...
My sons 1996 buick skylark starts then reuns until it warms up a,d idles down and dies. It will restart only if you hold you foot on the gas pedal and feather it to keep it running. Do you have any ideas? It's been sitting all winter now, and he needs to get it going...I've replaced the usual things, but nothing seems to get rid of the stall after it warms up. You can drive but you have to hold your foot on the gas pedal at the stops...
Submitted: 1 year ago.Category: Buick
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Answered in 1 minute by:
4/25/2016
Buick Mechanic: Gary, Buick Technician replied 1 year ago
Gary
Gary, Buick Technician
Category: Buick
Satisfied Customers: 17,256
Experience: 15 years master GM tech and mater ASE tech
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once it will stall and you hold your foot to the floor to run it when it starts will it blow out black or dark smoke out the exhaust then clear up and idle ok for a little bit ?are there any codes set in the computer at all history or current ?
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Customer reply replied 1 year ago
It stalls right after the motor heats up....if I restart with foot on gas pedal I get black smoke. There's no codes currently set...
Customer reply replied 1 year ago
I did a code reset after I replaced the parts that I thought would help, so there's no codes now...
Buick Mechanic: Gary, Buick Technician replied 1 year ago
can you get the car to act up and stall then remove the vacuum line off the fuel pressure regulator does fuel come out of the regulator port where the vacuum line connects to it ?these are so common for regulators bad and causing this exact problemif you see any fuel replace the regulatorif you have any questions please ask as i do not get credit for my work until you rate me here at Justanswer
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Customer reply replied 1 year ago
Yeah I was just out there and it stalled on me. I will look at the fuel pressure regulator now.
Customer reply replied 1 year ago
No there's no fuel in that vacuum line, on start up or running...
Customer reply replied 1 year ago
Can the EGR valve get stuck open after warming up? I know these are a pain in the ASS to find, that's why I didn't want him to buy this car...
Customer reply replied 1 year ago
I'll go check right now...
Buick Mechanic: Gary, Buick Technician replied 1 year ago
ok
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Customer reply replied 1 year ago
That wasn't it either, it still stalls....it idles up and down between(###) ###-####rpm and increasing gets wider in the idle until it just go so low it dies...
Buick Mechanic: Amedee, Buick Mechanic replied 1 year ago
Amedee
Amedee, Buick Mechanic
Category: Buick
Satisfied Customers: 26,784
Experience: ASE certified Technician advanced level specialist. Wisconsin certified emissions state inspector
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Hello and welcome! Different Expert here. If the fuel pressure regulator is not leaking, then this problem is likley caused by an air or a vacuum leak.. (which is very common) or a bad MAF sensor.
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Customer reply replied 1 year ago
We cleaned the MAF last fall, it was really pretty clean then. Didn't think that was the problem. The whole thing about these engines is, there's so much CRAP on these engines that use vacuum lines!!! I'm going to try to use some WD around the intake manifold and see if it's leaking. But to me, it would run and stall while it was cold too! Any ideas what would be leaking after it warms up? That's when it stalls, after its heated up...
Customer reply replied 1 year ago
EGR valve open?
Buick Mechanic: Amedee, Buick Mechanic replied 1 year ago
It could be faulty injectors, bad crankshaft position sensor, lazy idle air control valve (unless you replaced this) or a bad TPS sensor..
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Customer reply replied 1 year ago
We replaced the TPS, and the IAC, couldn't be that easy. Hope that the Crank position sensor, that's a bear to get at. Why would the injectors not work right after its warm?
Buick Mechanic: Amedee, Buick Mechanic replied 1 year ago
It really sounds like you have an air or a vacuum leak. This would be the most common cause of this idle issue when warm. I suspect it only does this after the engine warms up because the engine idle gets lower and the engine typically runs a bit leaner so at this point is when an air or a vacuum leak would show up. Was the mass air flow sensor replaced? If not, this can also do it too. One thing you can do is watch the TPS voltage to ensure it is nice and steady when this idle condition occurs. Same thing with the MAP sensor. A fluctuating MAP voltage indicates a vacuum leak. Oh, and dont forget about the engine coolant temp sensor.
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Buick Mechanic: Amedee, Buick Mechanic replied 1 year ago
I do work all day today but will be back on line late tonight. Let me know how it goes!
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Buick Mechanic: Amedee, Buick Mechanic replied 1 year ago
Hello! It'sCustomerfrom just answer. I am just checking in to see if you need any further assistance? Let me know!
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Amedee
Amedee
Amedee, Buick Mechanic
Category: Buick
Satisfied Customers: 26,784
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