The car starts up idles perfect! When i snap the throttle it wants to die and back fires at 2500rpm! I checked grounds there perfect! Any one else have this problem! Also when it hits 2500rpm the check engine light turns on for a second and then shuts off! It dosnt throw a CEL so i dont know if there is a short to the CEL or it throws a code for a second and then it sees everything normal! I need your help i am going to check voltage on all the sensors and see if there correct and then i will go from there!

 

ttt

 

anyone have anything?

 

What year/model/engine/etc?

If the ECU lights the CEL even briefly, it should store a code.

 

Sorry, 90 si civic! It dosnt store a code i am stumped!

 

hopefully you get that thing working correctly. that doesnt sound like a good thing thats happening.

 

well thats why i am asking the question...anyone?

 

Have you done any work to the car recently that might be causing this? Did it run normally and then one day just do this?

 

after a swap! The car had no engine to begin with! I just put in a stock motor!

 

ttt

 

Does it do this in gear or in nuetral? Both?

Is it a regular Si motor that you put in?

 

in neutral only! Havent taken it out on the road so really i dont know if it does it driving! The motor came out of the same year hatch(90) I recieved it from a friend who did a swap for a kid!

I am going home today and i am gonna check some things out! Pull exhaust maybe its clogged! Also do you think valves could be a problem? If they're not within spec?

 

it sounds like an ignition problem. what is the condition of the ignition parts? does the tach jump around when this is happening?

 

I agree, I had this same problem and it started getting worse and worse after time. Turned out it was my dizzy.

 

well i've replaced the cap,rotor,coil,plugs and wires! And yes the tach jumps around when it "acts" up!

 

ttt

 

you may need a distributor. i will do some more research and get back to you.

 

cool sounds good!

 

ttt
anyone else with any ideas! I am going to try a new dizzy!

 

do you have a frayed spark plug wire? if so is the clutch cable hitting it? if so then you're grounding out one of your sparks.

 

brand new wires!!

 

ttt keep'em coming!

 

yeah im pretty sure its the distributor.