Idle issues after warming up.

[clintonmomo]

Hello everyone.

I am new obviously. I purchased a 1995 Mitsu Eclipse 2.0l n/a 99K on the clock. no apparent motor/engine mods besides cold air intake and borla cat back. I cannot get this car to run for more than 10 minutes without it starting to sound like is a shop vac sputtering, missing, and for the kicker stalling. Funny thing is that it runs perfect when you first start it up when it is cold. After it warms up all hell breaks loose.

The following components have been replaced/checked:

O2 sensor
cam position sensor
coolant temp sensor
coil pack
plugs
wires
computer
new timing belt (installed before I got it) checked position
fuel pressure checked out
throttle postion sensor
generic obd 2 gives an unspecified code

Probably forgot somethings that where done but this is a good list.

Any insight would be great! I am almost ready to give up it is making me sick

Thanks

 

[2fast4]

Sounds like ECU caps gone south. Ask previous owner if the caps got replaced.

http://www.members.shaw.ca/costall/1000Q/answers-ECU.htm

 

[Spoolio]

yea, i had a 1991 dodge stealth with 3 bad ecu capacitors, it would sputter and wrong like hell i couldnt figure it out till someone mentioned something about my ecu., if you can deal without your car for about 2-3 days which im guessing you can since it wont run for more then 10 min, you can overnite your ecu out to Foreign ECU Repair for a Free checkup on your ecu, if they find anything wrong they will call you immed., i had 3 bad capacitors in my ecu i shipped it out and had it back in 4 days, which i thought was really fast, they are really nice guys, they will help you out over the phone and tell if it is worth sending your ecu in for a checkup or not, also if they find something wrong and they need to do work on it, they will resend your ecu overnite back to you., i recommend these guys to the max, also all the 3kgt and stealth guys , and stealth316 highly recommend them also, i hope this works for you . give them a call.


www.foreignecurepair.com

800-241-6689
9am to 8pm (Eastern) · Monday thru Friday
10am to 4pm (Eastern) Saturday

Our Shipping address is:

Foreign Auto Computer
14139 Curley Road
Dade City, FL 33525

 

[clintonmomo]

Thanks for the replies. It seems that there is a general conclusion on this one. And it took you guys about 10 minutes. any idea on what the cost of this would be? I looked and is this what I would have to do?

http://www.tmo.com/howto/ecu1g/checkeprom.htm

I have a good friend that repairs audio amplifiers and he said he could replace the caps. He is pretty reliable and does great work. So I trust him. I would just like to know if the like above shows the same set up that I would have to work with. Your thoughts and suggestions are much appreciated.

 

[clintonmomo]

Hello everyone and thanks for your help. I have some new news on this issue that I have been having and I am even more frustrated. I have purchased a new computer from a boneyard and the car did the same thing. And then.....

Also I sent the computers to be checked and talked with the techs at the forein ecu repair place and both of the computers I have in my possesion are functioning properly.

I was then told it was the ignition control module for the car. I purchased one of these at the tune of $121 from the parts store. (looks like a little black module about the size of a box of matches, attached to a little metal bracket.) Fine this should be easy enough I tell myself. Yeah right. I cannot find this thing on the car ANYWHERE. I have called the dealer and they say it does not exist. However it is listed in the parts for the car at every parts store in the world

Here is a link to what I am talking about. if you know what I am talking about you can help save me from ripping my hair out!

PLEASE PLEASE PLEASE HELP!!!!!!

http://www.rockauto.com/ref/SMP/SMPDetail2.html?LX671.jpg

 

[halik008]

You could have saved some $$ if somebody in here actually knew what they are talking about and tell you that leaky caps is 1g ecu thing....

 

[VelocitàPaola]

You could have saved some $$ if somebody in here actually knew what they are talking about and tell you that leaky caps is 1g ecu thing....

Exactly... not to mention that your 420A ECU (unlike the 4G63 one) is encapsulated in a protective epoxy that would make replacing faulty electronic components (i.e. capacitors) nearly out of the question.

When you talk to parts/service people, you need to specify that you have the 420A engine. Many times, you'll get advice for the 4G63 platform, which isn't comparable.

I'm moving this thread to the 420A forums where it might get some more 420A-specific attention.

 

[Raph]

Exactly... not to mention that your 420A ECU (unlike the 4G63 one) is encapsulated in a protective epoxy that would make replacing faulty electronic components (i.e. capacitors) nearly out of the question.

When you talk to parts/service people, you need to specify that you have the 420A engine. Many times, you'll get advice for the 4G63 platform, which isn't comparable.

I'm moving this thread to the 420A forums where it might get some more 420A-specific attention.

vacuum leaks,intake manifold gasket?tb gasket?
that power transistor is located near the coil(if the 420a has a power transistor)

head gasket? get a co test done..

 

[clintonmomo]

vacuum leaks,intake manifold gasket?tb gasket?
that power transistor is located near the coil(if the 420a has a power transistor)

head gasket? get a co test done..

I did the compression test and everything seemed great. I also checked fuel pressure. I am really running out of ideas. So if it even has one of these transistors it would be right on top in plain sight. Correct? I am confused everyone at parts stores stated that this was specific for the 95 eclipse FWD n/t 5spd????

 

[wongster]

i know you prob replaced the spark plugs and wires, but check again if there is a mis-fire.. i had a similar issue... it never really stalled, but felt like it was going too...

 

[clintonmomo]

i know you prob replaced the spark plugs and wires, but check again if there is a mis-fire.. i had a similar issue... it never really stalled, but felt like it was going too...

You are correct.

Plugs

wires

coil pack

were all replaced with new components, but if the plugs were bad the car would run bad all of the time right? It runs good when it first starts ( you would think nothing is wrong with it) and then it starts to run very poorly missing, sucking noise, etc.

 

[half-cocked]

You said checked/replaced engine coolant temp sensor, did you check it or replace it. I'm not knocking your ability but if you just checked it maybe you did it wrong because my '90 GST and my '01 Jetta GLS did the same thing and both needed new temp sensors.

 

[clintonmomo]

You said checked/replaced engine coolant temp sensor, did you check it or replace it. I'm not knocking your ability but if you just checked it maybe you did it wrong because my '90 GST and my '01 Jetta GLS did the same thing and both needed new temp sensors.

Sorry for the confusion. This was replaced also. I really am stumped.

 

[clintonmomo]

You must be logged in to view this image or video.

This is the unit that I am talking about.

My car is a :

1995 Eclipse GS

Non-Turbo

2.0L DOHC FWD

5 Speed

Please help

 

[4UH8ERS]

im going to say you should probably try your egr valve. try unplugging it and see how it runs.

 

[DSMcrazy3]

My bet is the EGR valve is sticking open when the car warms up, allowing that hot gas to pass back through the combustion chamber, causing the misfire.

 

[clintonmomo]

My bet is the EGR valve is sticking open when the car warms up, allowing that hot gas to pass back through the combustion chamber, causing the misfire.

Thanks for that suggestion also. I have just tried that with no avail. I don't understand this car at all? I still have no concrete evidence that this ignition control module even exists on this car either. I did not see it by the coil pack. I am almost out of ideas. PLEASE HELP

 

[DSMcrazy3]

I've never seen it

 

[clintonmomo]

I've never seen it

I am truly out of ideas. I have this car that I cannot drive and its killing me.

 

[2fast4]

The ignition module pic you posted should be found on inside engine compartment - connected to spark plug wire connector. Trace it back and it shouldn't be hard at all. It should be bolted onto intake mani.

It's been a while, was it the solution?

 

[VelocitàPaola]

The ignition module pic you posted should be found on inside engine compartment - connected to spark plug wire connector. Trace it back and it shouldn't be hard at all. It should be bolted onto intake mani.

It's been a while, was it the solution?

Wha? There is no such thing bolted to the intake manifold. I think you're thinking of some 4G63 car...