Low power w/ TCC locked - bad wires? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 08-09-2004, 03:51 AM   #11
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No that'* the funny thing, it is just fine at idle, just fine at WOT, the only time it misfires is when the TCC locks up.
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Old 08-09-2004, 12:11 PM   #12
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I smell fouled plugs from the previous misfires, just like Pdad.

There'* a couple things at play here. Intermittent misfires on a single cylinder are usually only apparent in OD, especially when under light load (a small hill). That'* usually a plug or wire, not a coil. A wire shorting out to something metal (block, dipstick tube, etc) may not happen at idle, but can during higher-than-idle rpm'*. This may have alot to do with the voltage the alternator is providing. As it raises, the spark voltage raises, allowing the arc to occur.

The 'lights out' trick may be for you, but I'd inspect all 6 plugs if I were you.

A 2-cylinder misfire is very obvious. It can be a coil, but may only be when the car is hot.

The other question I have is what condition is your alternator/battery in? This can have an effect on existing ignition problems.
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Old 08-09-2004, 08:56 PM   #13
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The problem I had with my coil is that one of the terminals would short out through the plastic to a ground. Don't know if that'* common or not, but it appears that you have ruled out the coils.
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Old 08-15-2004, 12:57 AM   #14
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I checked the back row of plugs and they looked OK. I replaced the front row (plugs 1, 3, and 5, which were less than 1 month old) and the misfire is pretty much gone. Yay!

Plugs 1 and 3 had center electrodes that were slightly white in color. But there was no significant buildup of anything. They looked fine otherwise. I can't believe my car is so picky about spark plugs!
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