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I have an 87' Buick Grand national-all stock. The car starts

Customer Question
I have an 87' Buick...
I have an 87' Buick Grand national-all stock. The car starts runs a little and then stalls. will not go above idle, even a little.
JA: Is the check engine light on? Does the car stall at idle or when driving?
Customer: Ck engine light lis not on. un-drivable
JA: What is the model/year of your Buick?
Customer: 1987 grand National
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: Replaced the Idle air valve, Throttle position sensor, adjusted the Cam sensor, replaced the MAF (used), Removed and cleaned the injectors, replaced the fuel pump and cleaned the tank, replace the fuel filter and air filter, plugs (gapped to .035") sparkl plug wires, sveral used ecm's
JA: Anything else you think the mechanic should know?
Customer: It did drive with fair drivability no not at all
Submitted: 1 year ago.Category: Buick
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Customer reply replied 1 year ago
Car had sat for 8 years. Fuel lines had to be cleaned out because of all the junk and injectors cleaned.
Answered in 6 minutes by:
8/8/2016
Buick Mechanic: Ron, ASE Certified Technician replied 1 year ago
Ron
Ron, ASE Certified Technician
Category: Buick
Satisfied Customers: 36,341
Experience: 34 years as a Tech
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Hello, my name is ***** ***** I am a professional here at Justanswer. Thank you for your question and I will assist you with your concern.

If you install your fuel pressure gauge to the fuel system what is the fuel pressure reading when the engine stalls out?

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Customer reply replied 1 year ago
37psi
Buick Mechanic: Ron, ASE Certified Technician replied 1 year ago

Are you able to keep the engine running if you give it some fuel when placing it in gear?

Can you rev the engine in Park?

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Customer reply replied 1 year ago
It will run and rev in park but stumbles badly. Also fuel pressure was at 32psi when it died, not 37
Buick Mechanic: Ron, ASE Certified Technician replied 1 year ago

The fuel pressure looks fine but it sure sounds like you starving for fuel or the engine can not breath, are you sure the exhaust system is clear?

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Customer reply replied 1 year ago
New exhaust and fuel pressure actually climbs when it dies (a little crime 28-32 psi)
Buick Mechanic: Ron, ASE Certified Technician replied 1 year ago

Well this sure sound like your loosing fuel pressure but with everything you have replaced I am out of ideas. I will open the post back up for you and perhaps another has something different to offer.

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Buick Mechanic: K. Wiggins, ASE Certified Technician replied 1 year ago
K. Wiggins
K. Wiggins, ASE Certified Technician
Category: Buick
Satisfied Customers: 3,032
Experience: ASE Certified Technician, Associates Degree in Automotive Technology, 15+ years in the trade
Verified

Hello, have you checked the fuel presure regulator?

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Customer reply replied 1 year ago
That also was replaced with new
Buick Mechanic: camerontech, auto technician replied 1 year ago
camerontech
camerontech, auto technician
Category: Buick
Satisfied Customers: 575
Experience: diagnostic auto tech
Verified

hi there,

question...

how were the fuel injectors cleaned? did you see the spray patern out of them?

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Customer reply replied 1 year ago
We bench cleaned them with brake clean. They looked good.
Buick Mechanic: camerontech, auto technician replied 1 year ago

it doesnt take much to plug up an injector.

if you have a bunch of dirt in the lines and you had to flush out the lines, than bench cleaning with brake clean will not clean them properly.

injectors sitting around for 8 years with raw old fuel will ruin them and have low flow.

right now im pointing to your injectors as being the problem

flow testing them while energizing them is the only way to check the flow.

i honestly dont think brake clean will clean them. they have to be sent away for that.

i would pull the entire fuel rail assembly off, disable the spark and crank the engine and see if your spray pattern is good

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Customer reply replied 1 year ago
They were energized and the spray pattern did improve (some of them dramatically) after running brake clean through them. I agree we were not scientific in our approach but the mechanic who helped had done it this way numerous times with success. the car did run and drive but lacked power before we cleaned the injectors. And cleaning the injectors (as filthy as they were) did not improve drive-ability. I cant imagine we made the drive-ability worse by cleaning them. It is possible that not all of the gunk was removed from the fuel line (from the filter to the fuel rail) and has gotten back into the injectors. Simple enough to find out.
Buick Mechanic: camerontech, auto technician replied 1 year ago

i have had lots of cars that sit for a long time. and it always seems to be the injectors. injectors plug and fail so easily, especially on older gms. i would really see if you can have them flow tested

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Buick Mechanic: camerontech, auto technician replied 1 year ago

hi there,
how did your repair go?

cam

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Customer reply replied 1 year ago
The injectors seem to spray fine. The did run and drive even before we cleaned the injectors by hand. The car will not go past idle and stalls a minute after being started. Somewhere a sensor is going nuts is my only conclusion because the car did run and drive and that was with dirty injectors and the injectors (although not factory-perfect) are cleaner than before and the same problem exists. Its not the injectors.
Buick Mechanic: camerontech, auto technician replied 1 year ago

ok no problem, thanks for the info. ill opt out for anither tech to jump in

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