light is on and i went to auto zone, had them run a diagnostic and come to find out that my its my gas cap ,mind you this gas cap is like 2-3 months old and was working just fine it tightened tighter than a virgins daughter, and lately it hasnt been tightening right so i found out the o ring on the gas cap was gone so i went and bought a new one , i put it in and it was not that tight i even had that thing clicking a good 5-6 times, and low and behold my check engine light is on again well, back to autozone, same gas cap code and well i got pissed and bought another gas cap, but the thing about the gas cap i had was that it tightened perfectly and the new gas cap just kept clicking and clicking, it seemed like the other cap was stiff like it actually tightened correctly so idk what to do, because seeing the check engine light makes me freak out so anyone ask questions or help me out?

 

Car information is missing.

 

AH 1999 honda civic ex

 

Post the CEL code

 

I have never had an issue with a gas cap on my 96. I am running a solid billet custom cap so there's nothing to click. It doesn't even make that whooshing noise when I take it off. No codes.

Why don't you post up the actual trouble code?

 

I think the lawsuit that led to the extended emissions warranty on some 96-98 Civics may have resulted from Honda disabling some EVAP emissions controls.

 

p1456

 

Does the car still have a high idle as mentioned in your previous thread?

 

semi high i adjusted my throttle because my acceleration response was laggy

 

Details?

 

well the idle is back where it should be which is below 1 correct?

 

How did you accomplish this? Details.

 

just topped off my break fluid and then moved over to my throttle and took two wrenches and tweaked out the throttle line so it had some slack but it wasnt so tight that it was pulling the throttle open

 

The 96-00 Civic service manual tells you how to troubleshoot P1456.

 

thanks for the tip, the check engine light just went off today

 

I'm having this same issue, Gas cap code. gas cap is new. Replaced fuel neck due to rust.. got replacement O-ring kit for my injectors coming.. smell fresh gas every now and then but very rare. Normally when we fill the tank. Car runs good, seems to me as something silly. Clueless. If someone could please help I'd greatly appreciate it. Thank you.

 

I'm trying to diagnose P1456. I dont have a service manual. Does anyone has any suggestions or tips? I would greatly appreciate it..

 

Try a OEM gas cap the auto store ones are universal. I would head over to the junk yard and pop one off I bet its like $5 at a pick your parts lot.

 

Leaking gas cap is only one of multiple possible causes for P1456.