Starts easily and idles nicely, but engine will not rev past 2500 RPM, spark just stops, and engine bogs and misfires. I used a simple spark test tool and watched the spark disappear as the engine misfired, also my timing light cuts out as the engine misfires.
Car is a 93 MX-6, with a KL-DE, MTX from a Probe, and the HEI mod.
Engine sounds funny at any throttle position.
Also, no matter what I do, I can't get the ignition timing advanced, even with the dist fully turned it's only just to about TDC. At throttle, the spark actually appears to retard, not advance, and it's all over the place.
No OBD codes are thrown (except 26, 28, and 29, EGR stuff must have fallen off when I was cornering hard).
Things I have tested and seem to check out:
The dist has the larger rotor shaft cap. Rotor only fits one way. At TDC rotor points to about 15 degrees counterclockwise (retarded) from plug 1.
I have a hunch that the crank position sensor CKP2 is the culprit, but I can't be sure. I verified its wiring, tested blue and green wires for opens and shorts to ECU, verified resistance between them (1.4 ohms), tested ground, all looks good.
I thought the crank position sensor would use a +5 index voltage like the one in the dist, but I don't measure any volts with the key in run. Should there be one? Is there any way to test this sensor without a scope? Also, the blue wire seems to be grounded by the ECU, essentially another ground.
Thanks.
Car is a 93 MX-6, with a KL-DE, MTX from a Probe, and the HEI mod.
Engine sounds funny at any throttle position.
Also, no matter what I do, I can't get the ignition timing advanced, even with the dist fully turned it's only just to about TDC. At throttle, the spark actually appears to retard, not advance, and it's all over the place.
No OBD codes are thrown (except 26, 28, and 29, EGR stuff must have fallen off when I was cornering hard).
Things I have tested and seem to check out:
- Swapped out coils
- Swapped out HEI ignitors.
- Verified wiring to ignitor intact, including ground at metal back.
- Swapped out ECU's (one is a KL01 and the other is a KL48)
- Tested the crank/cam position sensors in the dist with a multimeter
- Tested the resistance of the crank position sensor near the crank (520 ohms).
- Tested the VAF with a multimeter
- Verified the cam timing is correct (took off front covers).
- Verified that the front cam is not broken and dist rotates as expected.
- Verified grounds everywhere.
- No metal powder or shavings in oil.
- New fuel filter.
The dist has the larger rotor shaft cap. Rotor only fits one way. At TDC rotor points to about 15 degrees counterclockwise (retarded) from plug 1.
I have a hunch that the crank position sensor CKP2 is the culprit, but I can't be sure. I verified its wiring, tested blue and green wires for opens and shorts to ECU, verified resistance between them (1.4 ohms), tested ground, all looks good.
I thought the crank position sensor would use a +5 index voltage like the one in the dist, but I don't measure any volts with the key in run. Should there be one? Is there any way to test this sensor without a scope? Also, the blue wire seems to be grounded by the ECU, essentially another ground.
Thanks.
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