Hey guys-

I have a 99 Ex automatic. It idles low from time to time, and I know it has to either be the IACV or the EGR, but as I'm looking through literature, I don't see anything mentioning an EGR valve for an EX. Do they not have the system?

Sorry if this is a repeat question, just want to isolate some variables here.

Thanks-

K

 

How low?

 

I think the EGR only exist in the HX's D16y5 in the 96 to 00 generation.

 

after it warms up, so low that it hardly registers on the tach. Never ends up stalling though.

K

 

most likely its due to a dirty iacv, also check your ignition/spark plugs. could be a early sign of worn plugs, found that out after i replaced my iacv and cleaned it and still wasnt the problem.

 

is the tach possibly really inaccurate? I know it gets its signal from the distributor but IDK how it gets it from the distributor so I wouldn't know what part of it to troubleshoot.

 

I don't think its the tach, you can tell that the motor is vibrating a bit due to how low its idling. Also, I can feel the motor rev up from a lower RPM an engage the torque converter stall with a bit of a force because its reving up to get there.

I'm replacing the timing belt, idler pulley, water pump and thermostat (which I think remains open sometimes due to low temp readings) this weekend. I replaced the rotor, cap, wires and plugs a couple of weeks back.

Last, the car has a CAI on it (previous owner) I might take it back off and put the standard unit on it to isolate some variables. Is there any way I can clean the IACV or does it need to be replaced if its bad? I know it responds to temperature, so I would think if the car is running a bit cold it would raise the RPM, not lower it. I can't think of anything else in a non-egr car that would affect the idle other than the ECM.

Wonder what you guys think-

K

 

Here is a link how to clean the IACV.
https://www.hondacivicforum.com/foru...ad.php?t=62836

 

Do you have an aftermarket air intake system? If so, what kind?

 

I think it said "AES" on it? It seemed rather old.

I have everything put bacik together, runs great! I think the low idle problem may have gone away, but may be too soon to tell. Didn't do it on my test drive.

I think the problem may have been in the CAI. The grommets that hold the vacuum tube and the sensor were cracked and old, I think when the car got hot they provided a decent vacuum leak. I installed the thermostat and stock intake system. Pretty satisfied with the results so far, but will probably clean out the IACV in the future when I get some time.

Thanks for the link-

K