2G Need some emissions help. P0300 and P0505. HC 271ppm @ idle

[Mikey_Dsm]

Some background information about the car and mods it has.

I bought the car back in early January and it’s a 1995 Eclipse GST. It does has a few modifications done to it such as a 16g turbo, AFPR, oil catch can, FP exhaust manifold, Injen intake with the BOV recirculating back into it, a front mount intercooler with a boost and AFR gauge.

It didn’t have a cat originally because it was from an no emissions state but it has one now. The current fuel injectors are 450cc from a 1g but I also have 750cc FIC injectors that I plan on using later. And a spare set of 450cc’s from a 2nd gen.

It has its stock ECU currently in it at the moment. I do have ECMLink on another ECU, but I figured my best chance for it to pass is on its non modified 95 ECU so that’s what I’m going with unless you guys recommend me to use my ECMLink ECU.

I've done all the general basic maintenance it needs to get it going. I’ve done the timing belt with the water pump, flushed the coolant system and replaced the thermostat, drained the oil and got a new oil filter. It has NGK bpr7es spark plugs with new spark plug wires. And I’ve also recently replaced the head gasket, and valve stem seals because of the oil it was burning. That’s all I can think of at the moment.

As of right now the car gives a rough idle upon start up bouncing around 500-700 rpm’s until it gets to operating temp. The idle it sees when it fully warms up Is roughly around 1100 rpm’s. And after the test it threw a check engine light when I got home. P0300 and P0505.

I'm currently about to diagnose the problem by doing a boost leak test to make sure there isn’t a vacuum leak somewhere and checking the IAC as well as my throttle cable to make sure it isn’t stuck or adjusted incorrectly.

My guess is that if there is a small vacuum leak, it’s shooting just a little bit of gas causing my HC’s to go up and it’s causing me to fail the idle test. I have a picture with the results that I’ve put with the post. It used to be over 109 but now I’ve got it brought down to 51. But it’s still past the limit for me to pass.

I’ve done tons of reading on other posts similar to this one and I’m Really stumped as to what the issue could be. However I’ve come to the realization that I can’t figure it out, and I’m asking for any advice and guidance from anyone that might’ve had a similar issue, or thinks what the problem might be so I can fix the issue that’s causing me to fail emissions.

Any and all replies will be helpful.

Thanks for reading and have a great day!!!

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[steve]

According to the report your HC's 51ppm over the idle standard and over twice what your high speed results. The car might not be idling in closed loop and the idle speed is high.

Are the P0300 Random Misfire and P0505 Idle Control faults fixed?

ECMLink could help you figure out what's going on and perhaps lean it out.

 

[Mikey_Dsm]

According to the report your HC's 51ppm over the idle standard and over twice what your high speed results. The car might not be idling in closed loop and the idle speed is high.

Are the P0300 Random Misfire and P0505 Idle Control faults fixed?

ECMLink could help you figure out what's going on and perhaps lean it out.

the p0300 code gets thrown after driving a while due to me having to moving the spark plug wire order around so the car can start, similar to the later models when they add Ecm link. The code goes away when the I click the “use non 95/96 cam sensor” option on ecmlink.
I did find a couple boost leaks and fixed those as-well as the p0505 code it was throwing.

The base timing is set to 5 BTDC, and the fuel pressure is set to 42.5 on the afpr. If that information proves to be helpful too.

 

[chrysler kid]

are you sure you have the firing order correct for the 95 cars

you will need to do a boost leak test, that should tell us where the vacuum leak is and why it isnt idling correctly.

if you post a picture of the engine bay we should be able to visually identify your vacuum lines to make sure everything is correct

 

[steve]

the p0300 code gets thrown after driving a while due to me having to moving the spark plug wire order around so the car can start, similar to the later models when they add Ecm link. The code goes away when the I click the “use non 95/96 cam sensor” option on ecmlink.
I did find a couple boost leaks and fixed those as-well as the p0505 code it was throwing.

Lets see under the hood so we know what's really there... I wouldn't be too surprised if there was a 6 bolt swap involved.

 

[Mikey_Dsm]

I’m at work currently so i can’t send a pretty good Picture at the moment. But i found a few that hopefully give a good layout of the what im working with. The silver one is how it sets currently.

I am currently rebuilding a 6 bolt so I have something I can reference if you guys think it’s been swapped with a 6 bolt. I can give the engine code thats Been machined on the front of block whenever I have the chance if that’ll be helpful information too.

I am running the catch can correctly from a write up that talked about the pcv system and how it worked. it also showed a catch can setup diagram for a 3 port which is what I referenced when I set up.

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[steve]

Others could tell from the thermostat housing what block that is but it's got a 1G Black Top CAS rather than the 95 Cam Angle Sensor under/inside the intake cam sprocket. With a 2G intake manifold it's not likely a 1G head but it's not original.

 

[chrysler kid]

i cant tell how old the pictures are but in the last picture you have, you are missing the gasket between the throttle body and the intercooler pipe. I also dont see the gasket for the throttle body to the intake manifold

 

[Mikey_Dsm]

Others could tell from the thermostat housing what block that is but it's got a 1G Black Top CAS rather than the 95 Cam Angle Sensor under/inside the intake cam sprocket. With a 2G intake manifold it's not likely a 1G head but it's not original.

I do have receipts that the guy I bought it from did have to get an engine to replace what I’m assuming was its original one. From what I remember him telling me is that it had seized from oil starvation.
That is something I forgot to mention my bad.
It was originally on a 98 ecu that was tuned but I didn’t know how to the tune was set up so I switched it to its original one that was still there.

i cant tell how old the pictures are but in the last picture you have, you are missing the gasket between the throttle body and the intercooler pipe. I also dont see the gasket for the throttle body to the intake manifold

I did go back and double check the throttle body gaskets and i did put some felpro gaskets to make sure it was all sealed up when i was putting it back together to be on the safe side of things.
I also replaced the intake manifold gasket with a new oem one aswell.