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by falconfixer on January 9th, 2008

falconfixer

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98 Chevy S10 2.2L that misfires under wet conditions with no codes. I replaced plugs, wires, ignition modules, TPS sensor, computer, EGR valve etc.Checked connections to crank sensor, CAM sensor, MAP, catalic converter, O2 sensors. Any ideas?

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Answers. 5 helpful answers below.

  • by Bazooka574 on September 28th, 2008

    Bazooka574

    I would recommend checking your battery ground by adding a heavy gage grounding cable temporarily in parallel with the existing cable to see if the decreased resistance to current flow into the ground side of the battery reduces or eliminates the misfire when it rains.
    My thought process is based on experience with a 1986 F150 that had a few broken strands hidden inside the insulation of the ground cable. The nuts were tight, but the loose wires inside caused misfire when wet, and no fire when hot. Also, the resistance was fine cold and dry.
    Since there is no distributor, it would help to understand how the coil packs work on the 98. Cylinders 1and4, 2and3 are paired electrically on their coils. While one is exhausting at high temperature, the other is compressing and builds higher voltages across its spark plug gap. This causes it to fire its side of the coil instead of the exhausting cylinder spark plug. Water in the intake air slightly decreases the spark voltage buildup in the compressing cylinder and is also a little harder to ignite. This engine has already been tuned up fairly high compared to its low HP predecessor the Iron Duke 2.5L. It is easy for small problems with grounding to kill alternators and cause ignition problems.

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  • by 74_Mopar on January 30th, 2008

    74_Mopar

    Did you ever resolve this issue? I'm having the same problem on my 2000 S10 2.2.

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  • by csimme01 and Ninja Cooper UNMASKED on January 9th, 2008

    csimme01 and Ninja Cooper UNMASKED

    I don't see cap or rotor listed as being replaced. As answered before, check for water.

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  • by ken keniff on January 9th, 2008

    ken keniff

    check the cap for water or corousion

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  • by David_S4425 on February 10th, 2011

    David_S4425

    there are no cap and rotor on these. Be shure to check coil packs for cracks and corroded contacts, especially on the primary (underside) of the coil. GM located these like retards by the wheel well and salt and water get into them easily. About the only thing U need to fix on these, as well as the timing setup on the early 90's 2.2's

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You're reading 98 Chevy S10 2.2L that misfires under wet conditions with no codes. I replaced plugs, wires, ignition modules, TPS sensor, computer, EGR valve etc.Checked connections to crank sensor, CAM sensor, MAP, catalic converter, O2 sensors. Any ideas?

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