2003 Mercury sable stalls under slight load (going uphill) turn on air conditioning, car shakes and misses very bad and dies. What is a good course of action?

Asked by Mar 12, 2016 at 12:30 PM about the 2003 Mercury Sable LS

Question type: Maintenance & Repair

I have replace the pvc valve, repaired vacuum hoses to throttle body. Nothing
is obviously wrong by visual inspection. What would cause the drastic change
when air conditioner is turn on and making the condition worse? Makes me
think electrical.

3 Answers

77,925

Have you checked and cleaned the throttle body and the ISC unit and ports? You should also run a code check, it is possible that the ECM is not getting any ON commands from A/C or PSPS or any other demand units. If no codes are found and cleaning the above control units then I would recommend a 'live data" test be preformed, that way the tech can actually watch the system during actual operations and failures. HTH

Thank you tennis shoes, more to my efforst: I had a code found po191, after reading and replacing the fuel sensor located front top left prior to the fuel rail it is better (has more power) still misses, less now than before, with the warmer weather I drove it and turned on the ac, this drastically increased the miss. Reading your above comments ( not getting ac or psps commands) believe there is something with that. Replacing the fuel regulator/sensor did make the engine light go out. Still in need of a solution.

77,925

Ok when was it's last good tune up, it could be plugs or wires breaking down under load, you should run a good injector cleaner in the fuel tank, I use Techron in both my rigs. I have been sold on that stuff for over 19 years after it fixed an injector problem on my Tahoe that had a Vortec in it.

Your Answer

Add photo

Related Questions

Sable

Looking for a Used Sable in your area?

CarGurus has 1,163 nationwide Sable listings starting at $1,990.

ZIP:

Search Mercury Sable Questions

Mercury Sable Experts

#1 JP1956
JP1956
Reputation 580
#2 Tom Demyan
Tom Demyan
Reputation 480
#3 Guy Outland
Guy Outland
Reputation 360
View All

Related Models For Sale

Used Ford Taurus
352 Great Deals out of 22,219 listings starting at $1,499
Used Mercury Grand Marquis
28 Great Deals out of 2,247 listings starting at $1,500
Used Ford Crown Victoria
7 Great Deals out of 1,502 listings starting at $2,900
Used Ford Explorer
1,382 Great Deals out of 71,975 listings starting at $985
Used Chevrolet Impala
920 Great Deals out of 36,146 listings starting at $1,800
Used Honda Accord
1,165 Great Deals out of 77,424 listings starting at $969
Used Toyota Camry
1,439 Great Deals out of 99,768 listings starting at $700
Used Nissan Maxima
402 Great Deals out of 25,052 listings starting at $1,500
Used Ford F-150
3,337 Great Deals out of 203,178 listings starting at $1,273
Used Chevrolet Malibu
1,093 Great Deals out of 78,492 listings starting at $2,495
Used Toyota Sienna
365 Great Deals out of 26,896 listings starting at $1,495
Used Buick LeSabre
9 Great Deals out of 2,332 listings starting at $1,768