Hey guys I have a 97 Civic with a stock D16Y8. Symptoms: bucking and hesitating acceleration most noticeable it 1st, 2nd, and 3rd gear; between 2-3500 RPM. It doesn’t always do it, but it’s most noticeable with the engine cold. Seems to be running a little rich as well, new plugs are coated black. NO CEL!
What I have done:
-Cleaned throttle body
-Replaced PCV, plugs, wires, dizzy cap/rotor, air filter, fuel filter, MAP sensor (used known working), ignition coil (from a used good dizzy), upstream o2 sensor (HAD codes p0135, p0155)
-Drove with CAT unbolted to determine if clogged
-Run Redline SI-1 through fuel
-Checked all grounds.
My next steps: swap throttle body with a know working one to determine if TPS is acting up even though I DID check calibration and it seemed fine.
Replace the ICM (ignitor). Replace fuel injectors (maybe leaking or clogged?). Check fuel pressure to determine if FPR and pump is working correctly. Check mechanical timing.
I try to rule out timing because it is intermittent, and happens only at lower RPM’s, but who knows.
Some times it pulls hard, sometimes it feels laggy.
Any ideas? Am I on the right track? I thought for sure the o2 sensor would have fixed it since I had those codes.
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