1993 Buick Lesabre car jumping

DCRAIG1000

MEMBER
1993 BUICK LESABRE
6 CYL
FWD
AUTOMATIC
95,000 MILES

When going up a hill, small or large, my car starts jumping a bit. When I give it gas to go to a lower gear it is fine. It feels like it is coming from the underneath. It drives fine on the level roads. I dont think it has anything to do with the engine, but I would like some input. Thanks also my scanner shows no faults. Flashes 12 continously

Thursday, August 27th, 2009 AT 12:16 PM

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

Oxygen sensor
Catalytic converter
Dirty fuel injectors (cleaning the injectors often fixes this).
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)

Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
Wet plug wires

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Thursday, August 27th, 2009 AT 9:21 PM