As topic says.
What causes it? I do have spark and #4 piping is warm.
Thanks.

 

Sounds like you might have a bad or disconnected injector.

 

not burning fuel?
whatare the symptoms?
whats the compression test say?
what does the leakdown test say?

 

I pulled #4 wire, the engine idles the same with or without.
I checked the plug and found out that gas is all over the plug.
When I drive around my neighbor, the engine makes loud knocking noise 1k - 4k rpm. My car drives ok on highway. I did not do the comp. test and leakdown test. No tools around. Thanks.

 

that is sad, scary, funny all at the same time.. good luck with the remedy!

 

Ouch!

A compression tester can be had for quite cheap.

 

are these new plugs? wires? distributor cap/rotor?

 

No, I should have replaced them all. I was lazy going to Acura dealer lately.

 

Wow, what a great addition to this thread. Very helpful.

Chris - who would check the compression and leakdown also.

 

what else was done to the motor

 

Jun 3, RC 440cc, CTR pistons, Hytech header, Hondata s200 with SGT base map, etc.

 

hmmmm
check your plug wires, distributor cap/rotor, injector wiring.

 

Might be a long shut but also recheck #4 spark plug gap. When you say you have spark, did you check individual pistons or are you assuming you have a spark at #4 piston.

 

I just rewired #4 injector and my car runs good. Thanks to sgt and everyone.