Question about 1990 Buick LeSabre

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1990 LeSabre Power loss with AC on. Within a Half hour withthe AC on the car starts loosing power, bad miss or fuel flow, and gets gradually worse. The further you step on the accelerator the worse it gets and the engine will shut down. After turning the AC off and restarting it runs normally.

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Remove battery cables and clean all three of the connections & replace bolts.

Posted on May 09, 2010

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Posted on Jan 02, 2017

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Need to check the fuel injectors on my 1990 buick lesabre v6 3.8l


You will need a fuel injector testor, about a $100, and a fuel pressure guage, about a $100, to flow test the injectors.

You can ohm check them with an ohm meter to see if one or more has shorted windings. Remove the electrical connector and test between the two pins. They should all be about the same ohms. If one is significantly lower than it is probably bad. Its best to check them when they are hot (after the engine has warmed up).

Nov 29, 2012 | 1990 Buick LeSabre

1 Answer

Morris oxford stops after half hour drive


Once it stops checkto see if there is spark at the spark plugs and see if threr is fuel in the carb or flowing in the line. Does the motor still crank over? When will it restart? After it cools down?

May 07, 2012 | 1964 Morris Oxford

1 Answer

Just started missing all of a sudden loss of power


Sounds like dirty injectors, At next fill up add a fuel injector cleaner and fill up with highest octane fuel. Miss and power should correct within half a tank.

Nov 27, 2010 | Chevrolet C1500 Cars & Trucks

1 Answer

I have a 1990 jeep Cherokee inline 6 4.0litre,my


Bad fuel pump, or fuel regulator, use a small vise grip and squeeze the fuel return line a little bit (its a black hose located in the forward part of fuel supply rack feeding injectors) dont pinch it all the way shut. if it runs better its your fuel regulator. Thats a common problem with that type, later models did away with fuel return.

Mar 02, 2010 | 1990 Jeep Cherokee Limited

1 Answer

2004 jetta tdi, has engine miss & lack of power, has p0101 present, if unplugged has less power, but misses less, already cleaned extremely clogged egr valve, changed engine oil/filter, checked maf...


Running rough?? If i took a guess I'd say there's a faulty injector. Does it smoke like hell ?? Does it also miss at idle?- If so get a line wrench and a rag handy. Start the car and while idling wrap the rag around the base of the fuel line connector on injector 1 and crack it just a bit until fuel comes out. It might spray, thus the rag. If the miss gets worse, that ain't the injector to blame. Continue with the other 3. If you crack a line and there is no or very little change in the miss then you found the guilty party.

On a long shot it could also be a stuck valve.

Did that get it?? It sounds like an issue other than MAF but.... get a multimeter and try probing the connecter to the MAF. When you find out what it is , please let me know. I'm curious

*The key must be on*

pin 1- ignore it
pin 2- gnd = 12-14v
pins 2- 3 = 12-14v
pin 4- gnd = 5v
pins 3- 4 = 5v

P0101 - Mass Air Flow Sensor (G70): Implausible Signal

Possible Symptoms

  • Loss of Power
  • Erratic Idle
Possible Causes
  • Mass Air Flow Sensor (G70) faulty
  • Air Leak(s) after Mass Air Flow Sensor (G70)
  • Intake Air Filter dirty/faulty
  • Ground Spots corroded or Paint Residue
  • Wiring and/or Connections from/to Mass Air Flow Sensor (G70) faulty
Possible Solutions
  • Check Intake Air Filter
  • Check Mass Air Flow Sensor (G70)
  • Check Ground Spots
  • Check Wiring and/or Connections from/to Mass Air Flow Sensor (G70)

Dec 14, 2009 | Volkswagen New Jetta Cars & Trucks

1 Answer

Toyota Carina loss of power


lets start with the heating up problem!
replacing the thermostat and relay has nothing to do with it. common causes of heating up are improper valve setting timing, mismatch air-fuel ratio, worn-out piston rings, poor oil flow, poor radiator coolant flow.
i suppose you have changed your car motor oil. recheck if its on the right amount.


loss of power:
Common Causes
loose piston rings (causing insufficient compression: indications fog like smoke), air-fuel ratio incorrect, blockage in air intake.

check also for air on the fuel hoses if you experience often jurking problems regularly clean fuel strainers or filters.




Jun 14, 2009 | 1994 Toyota Corolla

1 Answer

Engine light on, bad fuel milage


You didn't mention if you replaced the mass air flow sensor, if the tech got that code, it needs replacing, if you haven't alresdy done so.

Feb 25, 2009 | 1997 Buick.5 Regal

2 Answers

Loss of power at 2400 rpm's


Check your mass airflow meter. If it's bad, at least on my 1990 300ZX, the car won't rev over 2400RPM (it's a safeguard built into the ECU of the car). Grab one from a scrapyard and swap it in and see if that fixes the issue.

Aug 23, 2008 | 1984 Nissan 300ZX

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