hi, i have 98 civic ex coupe d16y8 with aem cai and catback exhast, for some reason when i start up the car, even with full tank of gas, the engine cracks for a long time b4 it will start.

and once its started, it starts at like 1000rpm and then it would slowly go to like 1800rpm, but b4 it will just jump right up to 1800rpm.

anyone know why and can anyone help?

thx

 

Have you checked all of your vacuum lines?

 

where are they located?

if there is a leak, it should happen all the time, how come it only happen sometimes?

would valve timing be the problem, i know my engine timing is correct, but not the valve timing. but i am just wondering, if the valve timing is wrong, wouldn't it be happen all the time too, why would it only happen sometimes?

thx

 

Have you reset your ECU at anytime? It's worth trying...

It's actually referred to as valve lash or valve adjustment - FYI.

If this hasn't been done in a while, I'd do that too. I really don't think it would have much to do with your idle though.

Vacuum lines are all over your motor. If you hear a hissing, you most likely have a leak. Also check the lines for cracks or brittleness. It could be that one has a crack and the leak only occurs sometimes giving you the odd idle only sometimes.

hih

 

how do i reset the ecu?

 

dont you just unplug the negative battery cable? either that or pull the ECU jumper, right?

 

Right. You can pull the 7.5 amp fuse in the engine bay fuse box or just disconnect the battery. Most say to leave it out for like 30 seconds but others have said like 30 min.. I dunno really. Seems like 30 sec would work.

 

but would valve timing have any effct on car starting not properly?