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I've done a long laundry list of work on my Honda CRV. In the pass month, I've had....

valve job/re-seating of valves/new sleeves in intake side
valve adjustment to full spec.
new fuel filter
new alternator
new thermostat
new air change sensor
new belts
new seals
cleaned iac
adj idle
new battery
new distributor
new distributor cap
new rotator for distributor
flushed coolant

Now this last week after the car was running in tip top shape I found the headlights to flicker, the idle rough, the car would shake back and forth when sitting at a light and the instrument panel flickers with the idle(ie. as the engine rotates).

So I've checked...

Checked the valve clearance(Good)
Checked Belts (Good)
Checked Battery (Good)
Checked Alternator (Good)
Checked Grounding (Good)
Checked Timing Belt (Good)
Checked Fuses (Good)
Checked Batt Cables (Good)
Checked Spark Plugs (Good)
Checked Spark Plug Wires (Good)
Checked Coolant (Good)
Checked DTC (none)

Going to Recheck the IAC.

Any Suggestions, Remember now it surges, as it goes through the rotation of the motor and with the surge comes flickering of the internal lights and external lights (ie, headlights and rear lights), plus it also surges at any speed I'm driving at. It's way more apparent at night then in the daytime. But car doesn't stall yet, no DTC's, batter voltage is normal.


3,916 Posts
Check you battery to vehicle ground connections to make sure they are clean and making good contact (also, engine to frame ground wires and connections. I think there are at least two, maybe more.
If the light flickering is very fast, that could indicate a poor regulator in the new alternator. If the flickering is coinciding with the engine roughness, it may well just be a loose or corroded connection.
No codes?
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