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P0421 & P0303 hesitation/missfire 2003 2.4 Mitsubishi Eclipse

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This video will give you some basic steps on what to look for if you are experincing hesitation or miss-fire on acceleration(mine had symptoms only if I was more than half way of throttle), along with the check engine light codes listed in the title. This is specifically on a 2003 Mitsubishi Eclipse, but can apply to similar era vehicles

Опубликовано:

23 авг 2024

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Комментарии : 28

@DanielMcKenzie-np8hr 5 месяцев назад

Thank you for a great video, seriously I appreciate it.

@phillipmontes5145 9 месяцев назад

I have the same engine in my 05 Stratus, it's giving me exhaust catalyst too cold, and fuel evap gross leak and I'm having the same issues, tried cleaning the throttle body, new TPS sensor, cleaning the MAF, looked for vacuum leaks, blew out the purge valve and it's now giving me 3000rpm vs barely over 2g so I'm gonna definitely try this out and if anyone can think of anything else that may be causing it, already installed a new gas cap, fuel pump, injectors, rail, pressure regulator, and IAC all to no avail

@Tr1pMind Год назад

I'm getting the p0421 on the same car and engine. The car had been sitting for a while before I bought it and I had the same symptom of not being able to put the pedal down. The regulator seemed to free up after a few weeks of driving and also working out some cooling issues. But still getting the p421 code. Going to try new sparks and cleaning the MAF/throttle body before going for the regulator as it is a bit pricier. And see if It fixes.

@thechauffeur9726 Год назад

MAF seems to be pretty common for the code and symptoms too. I'd bet on the MAF

@jedidias7091 Год назад

Po421 is a cat code

@thechauffeur9726 Год назад

@@jedidias7091 you're right, I was thinking of 303

@thechauffeur9726 Год назад

@@jedidias7091 you're right, I was thinking of 303

@jedidias7091 Год назад

@@thechauffeur9726 random cylinder miss I think that is. But can be fron multiple reasons

@eddiesheeran5791 3 года назад

I've got the same car except it's a 2001 with 205k miles. I smoke-tested the intake on mine today and there's a pretty big vacuum leak coming from each end of the throttle blade shaft. My car will misfire a few times when accelerating from a stand-still (the tach needle jumps erratically too), and then it will almost die at idle when it's warm. The tach will almost hit zero, and then it'll catch itself and idle normally. It hasn't thrown a CEL yet, but I know there's a problem. It runs great at full throttle with high RPM, so I'm pretty sure the vacuum leaks are the problem. I don't want to find another throttle body but that might be the only way to repair this.

@thechauffeur9726 3 года назад

Could be EGR related also. I'm fighting issues with this now. Seems like once I hit 200k it's been one problem after the other

@eddiesheeran5791 3 года назад

@@thechauffeur9726 Same for me, around 200k miles is when a lot of parts start to go bad. I still like the car though, I don't regret the money and time spent keeping it up. It handles great, and it's got a ton of carrying space. My misfire is getting worse. I don't think it's the throttle shaft leaks, I'm pretty sure one of the two ignition coils is going out. The tach doesn't drop to zero, it drops by half the current RPM. I'm going to check the plugs and replace both coils pretty soon.

@kidcashin219huncho6 3 года назад

Did the check engine light come back on after you did this

@nelsonjaneiro5543 3 года назад

i have the same engine and the idle is going crazy i didt everything exep that i wonder if thas the problem what you thing

@Quickduice187 Год назад

I have a 2003 Chrysler Seabring with the 2.4 Mishibishi engine that is throwing the MAP sensor code at me. which makes it confusing because iv been searching for a 2003 Seabring MAP sensor and it is completely different.

@thechauffeur9726 Год назад

The MAP/Idle air control sensor is the same between the about that year Chrysler and this Mitsubishi. Part number RM31320001. The fuel pressure regulator may be different

@Quickduice187 Год назад

@@thechauffeur9726 yeah it looks like the park is PS10078.

@johnabdelmalek3509 2 года назад

Where can I find that little vacuum hose?!?

@juandelacerda3959 Год назад

Junk yard if you wanna get it cheap

@ballershanelle 5 месяцев назад

Mistubishi 0421 code

@michaelpalmer0150 2 года назад

Did it idle well and run rough?

@thechauffeur9726 2 года назад

It would hesitate under acceleration

@christianmcrae5389 Год назад

Much appreciated bro 💯 you got an Instagram?

@thechauffeur9726 Год назад

You throwing out a white power sign?? Fuck out here high school drop out

@christianmcrae5389 Год назад

@@thechauffeur9726 grow up ya cock sucker I'm the only one that graduated outta five siblings

@thechauffeur9726 Год назад

@@christianmcrae5389 sounds like you come from a family of idiots. Graduating high school isn't hard and you inbreds could only manage a 20% graduation rate.