1992 Buick LaSabre. Automatic. 136K mi. Accelerating, driving over 60, or going up a mild incline gives an intermittent hesitation. Puh, puh, puh, and loss of power. Mid grade fuel helps a little. High grade fuel offers no additional help. Driving next to a wall, I do hear pinging. Gidagidagidagida. But it seems to be able to ping without necessarily the hesitation. Driving up an incline, I get both. GidagidagidaPuh.. GidagidagidaPuh.. GidagidagidaPuh.. GidagidagidaPuh..
I thought about changing the knock sensor. But it is expensive. No check engine light. Is there a way to test the sensor? Is it possible for the sensor to be bad without a check engine light? Has anybody fixed this same problem?
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Re: Hesitation on Acceleration or Uphill.
The knock is caused by either timing issue or a lean cylinder condition, have you checked the fuel pressure?? has the fuel filter been changed?? A bad knock sensor will not set a light unless it is open or disconnected.
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Ok, there are many issues here that you will need to inspect. I recommend changing the fuel filter and pump as well. this will fix the hesitation. the intake and exhaust manifold gaskets will need to be replaced as well. this will stop the backfiring.
I also recommend checking and running a teat on the PCV valve and inspect the PCV hose as well. it could have a leak or a small crack on it.
Check the air filter and change if needed. this will help with acceleration issues as well. Next, i would run a check on all plugs and the complete wire set as well. change if needed.
Inspect the injectors for leaks and lose wires. make sure they are in good condition. replace any injectors that isn't firing properly.
Ok, there are some sensors that you will need to check as well. i will list them below.
SENSOR CHECK LIST--
1. Check the O2 sensors for worn wires. 2. Check the MAFS(Mas Air Flow Sensors) Check for Damaged, Loose, or Faulty Mass Air Flow Sensor or Circuit. 3. Check the Air Cleaner Temperature Sensor. this sensor could be damaged ro have loose wires. check accordingly. 4. Check the Throttle Position Sensor. this device could be connected wrong or it may be faulty as well. replace if needed.
Be sure and inspect all the above and repair any problem spot you ruin across during your inspection.
there are really only 2 things that cause this problem most of the time i have seen it, 1st a defective Mass Airflow Sensor, the second is low fuel pressure from a failing pump or obstructed fuel filter do u have a check/service engine soon light on at any time? have u had the system tested for trouble code's? Go to any Kragen or Autozone and ask for a OBD 2 trouble code test, it is free, record any code's that show and post them back here on this same thread.
92 Buick lesabre 97000 miles, on slow acceleration, @ 40mph going into 4th gear there is a mild chutter, same @ 50mph going into OD mild chutter and when down shifting from OD to 4th. All is when slow acceleration. When I say slow acceleration, I mean I drive like a older senior citizen when everyone behind me is annoyed I don't just donor and go. When I do romp to accelerate quicker, there is no chutter at all. Fluid is good and at perfect level. Any ideas? Great car just wondering the scoop is
You should definitely replace the fuel filter though this probably won't fix your hesitation. It wouldn't hurt to replace the spark plugs this is usually the culprit on these engine. I have the same engine in a '99 caravan and found the for some reason the spark plugs on cylinder 3 and 4 loosen up after one year and cause a misfire between 45 and 50 mph under load (when mildly accelerating).