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Hey all,
My '92 has developed a part-throttle, high-RPM 'hiccup' at 4000rpm and 5500rpm. It's a pretty harsh jerk that feels like the ignition is being shut off and turned back on. This started when I had nothing more than a slightly rough idle, and pulled my ICM and coils to take them in for testing. They all checked out, but when I was putting it back together I found a burned spark plug wire near the routing bracket under the front exhaust manifold. I replaced that wire with a spare I had, and put the rest of it back together. The idle smoothed out, but then this hiccup started happening instead. So I replaced all the spark plug wires last night, and it hasn't changed at all.
The ICM was tested on some kind of ICM tester at Autozone, I tested the coil resistance myself, and it was the same on all 3 though I don't remember the exact reading.
There are no codes. Last I checked, the plugs were in good shape, though I can't imagine how a plug would cause this. Anyone else ever experienced this before? The only other symptom is intermittent hot-stalling at stoplights, though I think that is a separate IAC problem.
My '92 has developed a part-throttle, high-RPM 'hiccup' at 4000rpm and 5500rpm. It's a pretty harsh jerk that feels like the ignition is being shut off and turned back on. This started when I had nothing more than a slightly rough idle, and pulled my ICM and coils to take them in for testing. They all checked out, but when I was putting it back together I found a burned spark plug wire near the routing bracket under the front exhaust manifold. I replaced that wire with a spare I had, and put the rest of it back together. The idle smoothed out, but then this hiccup started happening instead. So I replaced all the spark plug wires last night, and it hasn't changed at all.
The ICM was tested on some kind of ICM tester at Autozone, I tested the coil resistance myself, and it was the same on all 3 though I don't remember the exact reading.
There are no codes. Last I checked, the plugs were in good shape, though I can't imagine how a plug would cause this. Anyone else ever experienced this before? The only other symptom is intermittent hot-stalling at stoplights, though I think that is a separate IAC problem.
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