420A Engine dying at cold start?

[Culon1997GS]

Hello everyone, I’m having this issue whenever I start my car in the mornings, If I don't keep it at 1k rpm it will die, I have to keep my foot on the gas pedal for 5 sec at least, and then the RPMs will drop at about 300 and it will make its way up as the engine warms up, any idea what could be wrong?

 

[Culon1997GS]

Hello everyone, this is my second day in a row asking for help, I’ve been having this issue whenever it’s cold outside (44f/6Celsius) my engine would die whenever I don’t press the gas for a couple seconds, as I did in the last part of the video, anyone has any clue what can be happening?

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[dwb]

Looks like you have a check engine light. If true, pull the code and go from there.

 

[Culon1997GS]

Looks like you have a check engine light. If true, pull the code and go from there.

my codes are for IAC and EVAP if im not mistaken

 

[dwb]

my codes are for IAC

That's a good place to start.

 

[Culon1997GS]

That's a good place to start.

the weird thing about that sensor is that the pigtail just wont click in place:/

 

[dwb]

Maybe you need a new connector/pigtail? Here's two vendors that stock them:

EXTREME PSI : Your #1 Source for In Stock Performance Parts

ISC/IACV & Injector resistor connector (90-99 DSM/VR4/03-06 EVO)

91 to 99 DSM injector resistor and ISC 03-06 EVO injector resistor pack (EVO ISC is a different style connector, check back into electrical connectors page to find it).

www.ohm-racing.com

 

[BLACK'98DSM]

That would probably be a faulty IAC valve (idle air control). Double check the connector, but at this age almost all of them have gone bad. Before I deleted mine I was keeping multiple spares around. They're essentially an electric motor with a needle plunger. The electric motor either stops working, or acts sluggishly like your case. I think placement so close to the EGR was a design flaw.

One thing I'll note about replacement, tons of Chrysler engines used a similar part, which could be listed as interchangeable. It's likely when you buy a new one that the needle tip will be a larger size. This will cause low idle from air restriction. Unscrew your current tip and use it on the new IAC motor if it appears different.