420A 2gNT stalling while idle and stopping.. ### help

[Kslam1981]

420A. Engine starts fine then stalls during idle. Runs fine on open road, can't feel a single miss, but when coming to stop it will sometimes start to miss so bad it nearly stalls out. If stop and go traffic it will occasionally stall out coming to stop but restarts no problem. I had just gotten the valve cover gasket and timing belt replaced then this appeared. Looking back I think it may have been missing very very lightly before I had the t-belt/gasket replaced.. So I went back to the garage where I had the work done and asked for them to look it over. They said the voltage going to cylinder 4 was acting crazy and that it was more than likely a plug wire or plug acting up. To make a long story short I done that, then swapped the coil pack and still have the same issue! Thinking that maybe the first garage was wasting my time I took it elsewhere and they said it appeared to plug/wires or the coil pack! They said the voltage on cylinder 4 was off.. I told them I had done all that when I dropped it off yet this is all they can come up with.. any help?

 

[Diamond Star Werks]

Check for vacuum leaks and check to see if you idle air control valve is working right.

1997 Mitsubishi Eclipse FWD L4-1997cc 2.0L DOHC MFI
Idle Speed/Throttle Actuator - Electronic
Specifications, Electrical
Resistance/Torque Specifications_____Coil Resistance 38 - 52 ohms at 68 deg F Torque 2.2 ft.lb
If you want to check your coil pack____Primary Coil 0.51 - 0.61 ohms Secondary Coil 11.5 - 13.5 K ohms.
Check for vacuum leaks by spraying brake cleaner or starting fluid over any place that the engine draws a vacuum from. Do some testing and check back.

 

[deank1]

When an idle air control valve goes out, it does one of two things. Either stick open and raise the idle or stick closed and the car will die at idle.

 

[Kslam1981]

the garage its at had mentioned the EGR valve and another sensor, but said they wont sure and didnt want to take my $$ without actually fixing something they wont sure about.. I will call up there and mention the idle air control valve then, thanks for the quick replies, i will post back on the results
(mention the intake leaking as well but i think they already looked it over for that)

 

[Abe'sGST]

check your idle control valve yourself, if its bad its easy to replace and you will save yourself some money

 

[gusu]

the garage its at had mentioned the EGR valve and another sensor, but said they wont sure and didnt want to take my $$ without actually fixing something they wont sure about.. I will call up there and mention the idle air control valve then, thanks for the quick replies, i will post back on the results
(mention the intake leaking as well but i think they already looked it over for that)

I'm not familiar with your state's laws. But you can sandwich a EGR block off plate and keep the lines on if you want to fix your problem (if it is that), it also keeps carbon build up to a minimum.

By doing the sandwich method you can easily remove it and have all of your emission equipment easy to reverse in case you have to pass emissions in the future.

If you don't and wont have to you can remove the EGR just put the plate on (you still need a gasket). Then remove all the vacuum lines and cap them off.


A stuck open EGR will cause your car to stumble or stall at idle, you will also have terrible power when going WOT.

 

[Kslam1981]

How would i go about checking the IAC? I do see its nearly expensive as the EGR valve is.. ouch..

 

[21_Eclipse]

Check for vacuum leaks and check to see if you idle air control valve is working right.

1997 Mitsubishi Eclipse FWD L4-1997cc 2.0L DOHC MFI
Idle Speed/Throttle Actuator - Electronic
Specifications, Electrical
Resistance/Torque Specifications_____Coil Resistance 38 - 52 ohms at 68 deg F Torque 2.2 ft.lb
If you want to check your coil pack____Primary Coil 0.51 - 0.61 ohms Secondary Coil 11.5 - 13.5 K ohms.
Check for vacuum leaks by spraying brake cleaner or starting fluid over any place that the engine draws a vacuum from. Do some testing and check back.

If i wanted to check my vacuum Where would i spray the brake cleaner through?
i have a 95 RS

 

[bombDSM]

you could use the pcv valve.

 

[21_Eclipse]

you could use the pcv valve.

The tube going into the engine?
or the tube going to the silver thing above the engine?

And do i put it in while the cars off?

Some simple intructions would help, doesnt have to be too detailed.

 

[Diamond Star Werks]

If i wanted to check my vacuum Where would i spray the brake cleaner through?
i have a 95 RS

No you don't want to spray it in anything. The intake pulls air through the filter. Anywhere it should not pull air out of the atmosphere from anywhere else. SPray over the gasket areas. Such as where the intake bolts to the head where the throttle body bolts to the IM etc. Also spray over any vacuum lines to make sure none of them have any holes or cracks. I myself do not recommend spraying brake cleaner in the pcv area as you really don't want to spray a solvent in with your oil. Its easy to check if your pcv valve is stuck or not as it should constantly be opening and closing as the engine is running.

And No you spray it as the car is running as if the engine were off it would not be pulling vacuum if it were off. If its big enough you will usually notice a change in engine behavior when you spray over the leaking area. If its a small one and you can't really notice any change then you will need to monitor you 02 sensor reading as you spray. The 02s should read lean with a leak and when you spray over a leaking arrea it will make them read richer. Low volt reading is lean higher reading is rich.

 

[21_Eclipse]

No you don't want to spray it in anything. The intake pulls air through the filter. Anywhere it should not pull air out of the atmosphere from anywhere else. SPray over the gasket areas. Such as where the intake bolts to the head where the throttle body bolts to the IM etc. Also spray over any vacuum lines to make sure none of them have any holes or cracks. I myself do not recommend spraying brake cleaner in the pcv area as you really don't want to spray a solvent in with your oil. Its easy to check if your pcv valve is stuck or not as it should constantly be opening and closing as the engine is running.

And No you spray it as the car is running as if the engine were off it would not be pulling vacuum if it were off. If its big enough you will usually notice a change in engine behavior when you spray over the leaking area. If its a small one and you can't really notice any change then you will need to monitor you 02 sensor reading as you spray. The 02s should read lean with a leak and when you spray over a leaking arrea it will make them read richer. Low volt reading is lean higher reading is rich.

I dont have the knowledge nor the tools for the second procedure you listed.

But i can spray that brake fluid? over my engine parts as you listed

 

[Diamond Star Werks]

Second procedure only requires a volt meter. You simply connect it in whichever way you choose(buy a back probe or skin the wire) to the 02 sensor signal wire and turn the voltmeter to the 2000mv point and monitor it. Usually 02 sensors come with two white wires a grey and black. The black is the signal wire. The 02 if working properly and with no vacuum leaks should alternate btwn 50mv-950mv. If its running to lean it will stay in the low mv (milivolts) If its too rich it'll read high mv. And spray starting fluid, carb cleaner, or brake parts cleaner over any intake gasket area and any vacuum lines.

 

[DSMBanditFZ6]

I dont have the knowledge nor the tools for the second procedure you listed.

But i can spray that brake fluid? over my engine parts as you listed

CARBURATOR CLEANER OR BRAKE CLEANER!!! Not brake fluid. Sorry to yell just don't want you making a seemingly awful mistake

 

[21_Eclipse]

Second procedure only requires a volt meter. You simply connect it in whichever way you choose(buy a back probe or skin the wire) to the 02 sensor signal wire and turn the voltmeter to the 2000mv point and monitor it. Usually 02 sensors come with two white wires a grey and black. The black is the signal wire. The 02 if working properly and with no vacuum leaks should alternate btwn 50mv-950mv. If its running to lean it will stay in the low mv (milivolts) If its too rich it'll read high mv. And spray starting fluid, carb cleaner, or brake parts cleaner over any intake gasket area and any vacuum lines.

Great! Thank you for that its a little less complicated when you put it like that. Now i have no idea where to start looking for the o2 sensor. And just to make sure do the vaccum hoses look like the radiator hose or smaller? Thiner?

 

[Diamond Star Werks]

Pictures from Sprint: View Message
Pictures from Sprint: View Message
Yes and no radiator hoses are rubber or silicone or both. Vacuum lines can be rubber or plastic so be careful not to brake any. Most vacuum lines on the 420a engines are plastic. The pictures are your vacuum and vapor hose diagrams. If you have trouble seeing the words just and down control and scroll your mouse wheel to zoom in or out.
And yea don't use brake fluid. Carb cleaner, brake parts cleaner, or starting fluid whichever is cheapest. They will all work the same.