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Bought a used 2001 buick lesabre off of Craigslist. It ran

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perfect. I pulled the fuel...
Bought a used 2001 buick lesabre off of Craigslist. It ran perfect. I pulled the fuel pump relay to relieve fuel pressure, then I changed the fuel filter. Put FP relay back in. I started it up and ran it around the block to test it. The next morning it cranks and even turns over but dies immediately. If I give stay on the throttle it will stay running, but it dies as soon as I let off.
JA: Sometimes things that you think will be really complicated end up being easy to fix with a Buick. The Buick Mechanic I'm going to connect you with knows all the tricks and shortcuts. Are you hoping to fix this yourself?
Customer: I am hoping to
JA: Is there anything else the Buick Mechanic should be aware of about your Buick?
Customer: 104k miles. Been in LV or AZ its whole life. I've already done a lot of testing, its gonna be a novel
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Buick Mechanic about your situation and then connect you two.
Submitted: 1 year ago.Category: Buick
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Answered in 12 minutes by:
4/25/2016
Buick Mechanic: Amedee, Buick Mechanic replied 1 year ago
Amedee
Amedee, Buick Mechanic
Category: Buick
Satisfied Customers: 26,808
Experience: ASE certified Technician advanced level specialist. Wisconsin certified emissions state inspector
Verified
Hello and welcome! My name is ***** ***** I can assist you with your question. Have you checked the fuel pressure regulator to see if it is leaking? It might be leaking fuel into the vacuum hose or line causing this stalling condition..
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Customer reply replied 1 year ago
The fuel pressure regulator was not leaking but I replaced it anyway. Here is what I can tell you:
There are no codes
The fuel pump was noisy and the rear smelled of fuel when it did run, so I replaced that. I can hear it prime and the fuel pressure is 51 so it tests good.
It has strong spark on all coils/plugs. I replaced the plugs anyway because I didn't know if they had ever been replaced. The old plugs were black/sooty so I know it's rich.
There are no vacuum leaks detected.
Buick Mechanic: Amedee, Buick Mechanic replied 1 year ago
Thank you for that information. Does the fuel pressure leak down with the key on engine off or when turning the key off?
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Customer reply replied 1 year ago
After a second prime the pressure pegged at 51 quickly and stayed there until turning the power off. I don't recall what the gauge did once power was off.
Buick Mechanic: Amedee, Buick Mechanic replied 1 year ago
Is there anyway you can check this for me?
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Customer reply replied 1 year ago
Sorry disregard the phone request. I can check in a few hours when I am home
Buick Mechanic: Amedee, Buick Mechanic replied 1 year ago
Sounds good.
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Customer reply replied 1 year ago
OK so I did a fuel pressure test again. It went up to maybe 58 for a second or two, then dropped to 50 and stayed. When the power is turned off it stays at 50 and isn't creeping down at all.
Customer reply replied 1 year ago
OK I stand corrected, it's creeping down ever so slightly, it's down to 49 after maybe 4 mins and dropping
Buick Mechanic: Amedee, Buick Mechanic replied 1 year ago
Does it continue dropping down lower than 45 psi, 40 or even as low as 35 psi?
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Customer reply replied 1 year ago
It's been almost 10 mins and it stopped at 48
Buick Mechanic: Amedee, Buick Mechanic replied 1 year ago
Ok, good, then that should not be an issue..
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Customer reply replied 1 year ago
The only other thing I can think to tell you is I had a "mobile mechanic" look at it and he said it wouldn't let him read the live data so maybe the PCM was bad but apparently that is a rare occurrence
Buick Mechanic: Amedee, Buick Mechanic replied 1 year ago
That is a possibility. Does the TPS have a 5 volt reference going to it with the key on?
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Customer reply replied 1 year ago
I have a multimeter though I still don't know how to check volts with it... I can if you walk me through it
Customer reply replied 1 year ago
Oh and I left the fuel pressure gauge on and after like 75 mins it was at 41, not sure if that is negligible or significant
Buick Mechanic: Amedee, Buick Mechanic replied 1 year ago
That is ok. YES, I can walk you through this over the phone..
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Customer reply replied 1 year ago
I'm gonna try to figure it out real quick I'll keep you posted
Buick Mechanic: Dave Nova, Buick Technician replied 1 year ago
Dave Nova
Dave Nova, Buick Technician
Category: Buick
Satisfied Customers: 19,452
Experience: ASE Master Certification. GM World Class Certification
Verified
New expert here. Try unplugging the mass airflow sensor, then start the engine. Does it stay running?
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Customer reply replied 1 year ago
@ Dave that had been tried previously, no it doesn't stay running
Buick Mechanic: Dave Nova, Buick Technician replied 1 year ago
Is the check engine light on with the engine running?
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Customer reply replied 1 year ago
No check engine light, no codes
Buick Mechanic: Dave Nova, Buick Technician replied 1 year ago
Has the throttle body been cleaned?
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Customer reply replied 1 year ago
Not that I know of, I can do that
Buick Mechanic: Dave Nova, Buick Technician replied 1 year ago
Do that and let me know how it turns out. It could be excessive carbon buildup that is not allowing the engine to run at idle speeds.
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Customer reply replied 1 year ago
I keep getting an email notification about every half an hour to reply to the message from Amedee saying "yes that is OK. I can walk you through it over the phone" can you make that stop please? Thank you
Buick Mechanic: Dave Nova, Buick Technician replied 1 year ago
As an expert I cannot access that part of the site. Look for a help link at the top or bottom of your page. There may be a way to report this problem there. There may also be a link in the email where you can decline his offer of a phone call. I am sorry I can't help with that.
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Customer reply replied 1 year ago
Oh OK thank you
Buick Mechanic: Dave Nova, Buick Technician replied 1 year ago
Let me know how the throttle body cleaning goes and we can work on the problem from there.Dave
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Customer reply replied 1 year ago
Will do Dave, I'll knock that out when I get home this evening
Buick Mechanic: Dave Nova, Buick Technician replied 1 year ago
Sounds great. Talk to you then.
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Customer reply replied 1 year ago
Throttle body all clean and it started up! You can consider the issue resolved, thank you Dave!
Buick Mechanic: Dave Nova, Buick Technician replied 1 year ago
You are very welcome. Glad I could help.Dave
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Dave Nova
Dave Nova
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