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Thread: 97 Chevy Pickup 5.7l sputtering and missing after warmup

  1. #1
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    97 Chevy Pickup 5.7l sputtering and missing after warmup

    About a week ago my pickup started sputtering and missing on light load after driving the vehicle for around 15-20 minutes. Replaced the Engine Heat Sensor because a mechanic friend of mine said this could cause the sputtering because of excessive fuel being fed to engine under light load. The engine runs great up to this point and even when you accelerate hard. Does anyone know what could cause this? I replaced the distributor about 4 months ago when it went out. I have currently 209,000 miles on this, but it has always been a great runner and dependable. Any help would be greatly appreciated.

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    Senior Moderator chevychase's Avatar
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    What is the heat sensor..talking about 02 sensor heater? Do you have a sel.service engine light? If so have scanned.
    Could be quite a few things ..try checking or changing the coolant temp senor located beside thermostat housing 10 bucks .
    Might be adding to much fuel.. at idle hesitations ..but uses extra fuel after acceleration.
    Hard to say with out a service light.

    Gitter done have fun. Running on empty...running blind...running behind.....

  3. #3
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    Heat sensor is the coolant temp sensor. No SEL, no codes

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    Could it be the IAC? I've heard it could be this too. Hard telling with no codes. I did have a 0141 O2 senor malfunction light last week, but has not come back on since re-setting

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    Senior Moderator chevychase's Avatar
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    Like said hard to tell ..no codes...i believe if it keeps doing this you will eventually get one.
    Seems if iacv would get a code. Maybe just low speed miss plugs or wires.. can have a high speed miss also.
    We do not want to keep guessing waste money. If not to bad run it should get a code.

    Gitter done have fun. Running on empty...running blind...running behind.....

  6. #6
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    weak coil...bad wires?
    4 wheels move the body
    2 wheels move the soul
    B.W.A.I
    Snow is a lot like religion and a lot like sex....you never know when you are going to get it!....or how much you will get

  7. #7
    Senior Member Sodell's Avatar
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    I would check (replace) the O2 Sensor, what your describing happened to me and I only got the check engine light a couple of times. The only reason I know this is because I accidently unhooked the O2 plug while doing some work on the engine. I usually learn by experience. I sounds like it only happens once it enters a closed loop.

    A code P0141 may mean that one or more of the following has happened:
    • open or short to ground in the wiring harness
    • O2 heater circuit wiring high resistance
    • O2 heater element resistance is high
    • Internal short or open in the heater element

  8. #8
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    Id check spark plugs for correct heat range>>could be heating up after driving awhile causing the sputtering.>>getting too hot & fouling out>>

  9. #9
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    Well, went with your suggestion Sodell since I did have a 0141 code last week. So far (knock on wood) it seems to be running better. I drove it around last night for about a half hour and drove it to work this morning (about 20 mi.) and it has not acted up. (And it was no picnic getting to the 02 sensor to change) I do think I will go ahead and change out the plug wires and thermostat tonight also, since those weren't changed when I put the new distributor and plugs in it last summer. (Maybe a insurance policy?) I appreciate everyones input and will keep you guys informed if no more problems surface.

  10. #10
    Senior Moderator chevychase's Avatar
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    Sodell getting to be a regular ole diagnostics man there. Glad it is running better ...keep us posted.

    Gitter done have fun. Running on empty...running blind...running behind.....

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