I did some maintenance on my car today.

-valve adjustment
-EGR Port clean
-Throttle body clean
-Transmission fluid
-Steering fluid
-Bleed brakes and fresh fluid
-Oil
-Spark plugs (NGK)
-Added tension to power steering pump

Once I was finished with everything, my car was at idle higher than usual around 1300. When I would rev it to around 2000 rpm's and release the gas, the rpm's would hang for a bit and then fall really fast like the engine was being choked and then rest around 1100 rpm's.

I then pulled the car back to garage and noticed that I had forgotten to bolt down the ground wire on the valve cover. I let the engine cool down, and I re-checked the valves and made some minor adjustments.

The car seems to be idling good, the valves sound great, but the rpm's tend to hang a little longer than they should. I have an automatic, and I am used to the rpm's dropping when i let off the gas, but after the service, it will stay in the gear and coast for a few seconds before shifting down. Also, when I rev it in neutral, the rpm's tend fall slowly rather than quickly.

Does anyone have any suggestions to why this may be happening? I have been recommended to bleed the cooling system buy have no clue why it would make a difference because I did not change it.

Thanks in advance.

 

Vacuum leak? How did you clean the throttle body? Could you have gotten something inside the IAC valve?

 

Oh, I've been meaning to say this. I used to think that after letting coolant leak out of the idle control valves when taking them off would fix itself after bleeding the air out of the system using the bleeder valve, but I had a slightly hanging idle after throttle after doing all my intake manifold maintenance a couple weeks ago. I thought originally it was normal but the other day I was fooling around with my heater, turning it on full blast to check my thermostat and the next day I noticed my hanging idle is gone. I think that it was an air pocket somewhere near the valves that was causing my hanging idle and turning on my heater blower helped push the air out.

I don't know if you had coolant fall out when doing your maintenance, but that's what I would suggest you do just for the hell of it. Also don't even spray carb cleaner in your EACV when it's hot, lol I did this and clearly the carb cleaner boiled then swelled the valve seals to the point it didn't work anymore.

 

Check your TPS (throttle Position Senor). My TPS isnt working well n i need to replace it, I have the same problem when i 1st start the car. If u hold on the gas pedal to around 3000rpm for about 3sec then let go it should go back down to normal.

 

I have the same problem.. I've been messing around with my throttle cable and beginning to think that it's my cable spring... I notice that it doesn't uncoil like it should after you press the gas...

 

Well I did not service the coolant and I never removed my IACV. All I did was take off the air intake hose, and make sure there was not build up in the throttle body.

For the egr, I took off the fuel rail system and then the egr port cover, cleaned it out, some of the carbon build up fell into the system but not very much.

I am thinking that maybe the valves are a little too tight. I suppose it could be coolant issues, but I did not disconnect or mess around with any coolant lines.

 

Valve that are a tad on the tight side won't cause a high idle. I would probably rule out a vacuum leak. Spray some carb cleaner or something similar around the parts you serviced and see if the engine reacts.

 

There's a vacuum line that goes to a t-fitting near the battery from the throttle body, make sure you put that back on and good.

 

I cleaned out the throttle body and am sure that it is not sticking. Then i sprayed carb cleaner around the fuel rail and noticed the rpm's raise slightly. So i am thinking vacuum leak. I sprayed a little lower in the area where i did the EGR port clean, and the idle raised and then almost completely died, so I am sure there is a leak in there somewhere.

I think i may have damaged the gasket that is under the plate you need to take off to clean the egr ports. It is the plate that is on top of the intake manifold tubes that come out of engine. Does anybody know what that part is called?

 

EGR chamber gasket (17146-P0A-004). That is for a 95 EX, wasn't sure of your year/make. Look at Majestic in the intake section for your year/model.

 

They sell egr gaskets at all auto parts stores for like 2 bucks. Obviously unless you're gonna be getting more than 50 bucks or so parts from majestic it's best to either go to the dealer or buy a felpro from the auto parts stores since Majestic charges handling and shipping fees. They are, however cheaper than any dealer if you buy more parts.

 

Are we talking about the gasket under the valve or the one under the "plate"?

 

We are talking about the EGR chamber. Thanks for the reply. I purchased a new one from Honda for $35. Before I install the gasket, I am going to double check and make sure i didn't accidentally roll over one of the seals when I installed the injectors cause apparently it is easy to do. Hopefully it is that simple, but i may just install the gasket regardless. Thanks for your help.