Peusdeus

1999 Honda civic si. 42k miles. Yes very low miles. Cars turns on and idles fine. Drives good for about 3 to 5 miles under normal and heavy throttle. After a while it's starts to bogg and sputter in fourth and fifth gear. In neutral and in gear the car will shut off. No check engine light! I get a strong suffer smell from the exhaust. 30 seconds later the car cranks for a little and turns on. Drives normal and a little while repeats problems. I've changed the following parts. New cap, rotor, plugs, wires, ignition coil, ignition module and catalytic converter. Started up perfect. Ripped through 1st, 2nd, 3rd gears without any hesitation. Ran like a beast. Couple of more miles it bogged out and died. Still no check engine light. Please help me! Thank you. Oh and one more part I'll change when it comes in. Ignition relay.

Peusdeus

Sulfer* not suffer

ezone

Sulfur = Pig rich

Got a scanner? Scangauge? Live engine data readout?

What's the coolant temp read in the datalist when it acts up?

What's the primary O2 sensor reading when it acts up?
What are the Short term and Long term fuel trims doing when it acts up?




Unplug the primary (front) O2 sensor and drive it a day or two. See if this problem is gone while it's unplugged.

Peusdeus

I don't have a scanner, wouldn't it throw a check engine light cause of a faulty read o2? I don't have readings.....

ezone

NO!
It would only turn on the light if it failed in a way the computer can detect.