2G Help diagnosing CEL P0420 and P1105 codes and symptoms.

[ohio_dsm]

My stock"ish" 2g is throwing both a p0420 and p1105. I am assuming the p0420 is because I am catless but I am not sure the other. I know it is a fuel solenoid code but my research is showing that it wouldn't have effect on the car. But my car is experiencing idle surges and fuel cut when it boost. Are they all related?

 

[pauleyman]

Do you have a fuel pressure solenoid? Are you sure i'ts fuel cut? Give us the symptoms, not what you think it is. Cutting out? Runs poor? Feels like you hit a brich wall? Jerking? What is it doing?

 

[ohio_dsm]

Yes still has fuel pressure solenoid. I hit 10lbs of boost and the car starts bucking and when I watch the boost gauge it hits 10 then plummets to 3-5 then builds back up and repeat. If I'm not wot and let it build slower I don't get the bucking.

 

[pauleyman]

That doesn't sound like fuel cut. That sounds like a misfire. Fuel cut is immediate and violent. What maintenance have you done. Plugs? Wires?

 

[ohio_dsm]

Plugs and wires were done before I got the car in 2019 (seller gave me shop paperwork). Those plugs and wires have roughly 25k miles on them.

oh and also when it starts bucking my afr reads rich.

 

[SixBolt_16G]

oh and also when it starts bucking my afr reads rich.

All the more reason to pull your plugs and see what they look like. Takes 5 minutes. When I was running rich my plugs fouled fairly quickly.Not saying thats the problem, but it is or will be a problem sooner than later if youre running rich and will again mimic the same issue that youre having now ,possibly without throwing you a code.... Also what kind of plugs does it say on the paperwork? Our cars like the cheapy copper NGKs.

 

[ohio_dsm]

All the more reason to pull your plugs and see what they look like. Takes 5 minutes. When I was running rich my plugs fouled fairly quickly.Not saying thats the problem, but it is or will be a problem sooner than later if youre running rich and will again mimic the same issue that youre having now ,possibly without throwing you a code.... Also what kind of plugs does it say on the paperwork? Our cars like the cheapy copper NGKs.

cooper denso. I am glad I read this I was going to put in an order for the NGL IX Iridiums.

 

[SixBolt_16G]

cooper denso. I am glad I read this I was going to put in an order for the NGL IX Iridiums.

Since you are close to stock you should be good with 6's.

click for NGK BPR6ES

Gap should be 0.28... (Someone correct me if im wrong)

I use one range colder with the 7's because Im modified, but I just buy these in bulk since they are cheap... and never gonna get any cheaper.

 

[ohio_dsm]

I'm starting to modify now, I'm just trying to get the codes cleared up and all the issues fixed before. I bought it to modify but then got completely wrapped up in a Subaru build so now im back the Eclipse. Also the paperwork has them currently gapped at .032

 

[chrysler kid]

Boost cut is extremely violent, like did it just shoot a piston violent.

What turbo does the car have

Cane you post a cureent picture of the engine bay

 

[ohio_dsm]

It has the factory turbo.

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[SixBolt_16G]

It has the factory turbo.

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That hose coming off the valve cover... where is it going and whats at the other end?
The port on your intake to the bottom right of your bov return hose, is it sealed off? Because thats where that hose is connected on my car. Just wondering what yours is connected to.

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[ohio_dsm]

Thank you! I didn't notice that. The valve cover hose popped from the intake. I just now see that in this pic. I'll fix that tonight and see what difference it makes.

 

[chrysler kid]

That hose coming off the valve cover... where is it going and whats at the other end?
The port on your intake to the bottom right of your bov return hose, is it sealed off? Because thats where that hose is connected on my car. Just wondering what yours is connected to.

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Yessir!!!!

That will cause a massive vacuum leak!

 

[ohio_dsm]

That hose coming off the valve cover... where is it going and whats at the other end?
The port on your intake to the bottom right of your bov return hose, is it sealed off? Because thats where that hose is connected on my car. Just wondering what yours is connected to.

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Yessir!!!!

That will cause a massive vacuum leak!

Alright made sure the line was attached to the intake and secured. Took it out for a drive and still doing the same bucking.

 

[TerminalTalon]

Did you do anything before it started acting up?
Also 25k and 2019 means it needed plugs awhile ago to me.

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[ohio_dsm]

Did you do anything before it started acting up?
Also 25k and 2019 means it needed plugs awhile ago to me.

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The alternator belt broke and I had a shop put one on for me and I also replaced the valve cover gasket. Both of those were recent done before it started acting up.

 

[Nick903@]

My stock"ish" 2g is throwing both a p0420 and p1105. I am assuming the p0420 is because I am catless but I am not sure the other. I know it is a fuel solenoid code but my research is showing that it wouldn't have effect on the car. But my car is experiencing idle surges and fuel cut when it boost. Are they all related?

sounds like fuel cut check all intercooler pipping and fuel lines in the engine bay verify there’s no rips in the wire leading to that solenoid also wouldn’t hurt to replace it see what that does but once u replace it make sure to unplug thermal for 15mins then give it a try

 

[ohio_dsm]

sounds like fuel cut check all intercooler pipping and fuel lines in the engine bay verify there’s no rips in the wire leading to that solenoid also wouldn’t hurt to replace it see what that does but once u replace it make sure to unplug thermal for 15mins then give it a try

I bought new vacuum lines and egr block off plate to eliminate all emission and unnecessary vacuum lines. Would this solved the problem once I reroute the lines and eliminate the solenoid all together?

 

[Nick903@]

I bought new vacuum lines and egr block off plate to eliminate all emission and unnecessary vacuum lines. Would this solved the problem once I reroute the lines and eliminate the solenoid all together?

Same here less issues down the road

 

[chrysler kid]

I bought new vacuum lines and egr block off plate to eliminate all emission and unnecessary vacuum lines. Would this solved the problem once I reroute the lines and eliminate the solenoid all together?

If the egr valve is bad it might, it will also cause a check engine light. It will take a few weeks of driving but eventually the map sensor will run enough checks to realize the egr valve isnt working.

You will need to boost leak test the car to pinpoint the vacuum leak or boost leak. You could also have a smoke test done

 

[ohio_dsm]

If the egr valve is bad it might, it will also cause a check engine light. It will take a few weeks of driving but eventually the map sensor will run enough checks to realize the egr valve isnt working.

You will need to boost leak test the car to pinpoint the vacuum leak or boost leak. You could also have a smoke test done

I get what your saying. But my thinking is if I eliminate the Fuel Solenoid all together then I do not have to worry about replacing it and can check that off my list.

 

[chrysler kid]

I get what your saying. But my thinking is if I eliminate the Fuel Solenoid all together then I do not have to worry about replacing it and can check that off my list.

Yeah, if the solenoid failed open it would just recirculate the vacuum back into the fuel pressure regulator. Mine failed a few years ago and it never caused any problems, just the check engine light

 

[pauleyman]

Change the plugs. Iridium is a waste of money. You do not have fuel cut.