420A Car dying

[Cfrakes]

I got a 1999 eclipse RS and whenever I crank it turns over but immediately dies. It takes about 4 times before it actually stays on. Then it also has a issue where it sounds like it's about to die out with the rpms going up and down from 600 to about 1000 rpms. I just got the car as a project and it does have a aftermarket cold air intake. Could that be that cause? Any ideas are appreciated thanks.

 

[Dericsh]

Make sure there are no air leaks after the mass air flow sensor.

 

[luv2rallye]

Also check that the fuel pressure is maintained while running and while engine is off for days. And perhaps change the fuel filter.

 

[BLACK'98DSM]

A cold air intake would not cause that problem. It's probably a big vacuum leak or a bad IAC valve.

 

[Arrell]

Have you checked your compression or performed a leak down test?Do you have carbon build up by the exhaust or any oxygen sensor codes?

 

[Cfrakes]

A cold air intake would not cause that problem. It's probably a big vacuum leak or a bad IAC valve.

Would a pcv without a hose connected be enough of a leak to cause it? I know for a fact the IAC is good. Thanks.

 

[Cfrakes]

Have you checked your compression or performed a leak down test?Do you have carbon build up by the exhaust or any oxygen sensor codes?

Compression is around 190 across the board if I remember correctly. No carbon build and zero engine codes

 

[BLACK'98DSM]

Would a pcv without a hose connected be enough of a leak to cause it? I know for a fact the IAC is good. Thanks.

Yes that would be a huge leak. The fitting on the intake manifold is 3/8" so I would imagine a lot of air is passing through and causing lean conditions.