2G Surging 1997 Eclipse GST

[jmgonz]

Been having some surging issues with my 2g Eclipse GS-T. RPM varies from about 400-1100 sometimes when idling. I have been trying to troubleshoot this problem for a while and I have changed IAC valve, MAF sensor, and checked for any leaking vacuum lines which seem to have no issues.

RPM kicked up when I sprayed carburetor cleaner into my blow-off valve (previous owner installed a GReddy type S) so I’m wondering if I need to replace the diaphragm or another part within the BOV?

When I unplug my MAF sensor the surging also goes away so is it likely the issue is coming from the BOV or could it be something else?

I also have a slight fuel smell sometimes and need to do sparks so injectors/spark plugs are on the table, I also hear the PCV valve on these cars goes bad which can cause this.

I appreciate any help I can get, thanks!

 

[luv2rallye]

Some ideas:
- http://www.dsm.org/how-tos/tttt/tttt3.html
- https://www.dsmtuners.com/threads/idle-throttle-body.433552/#post-152950655
- https://www.dsmtuners.com/threads/rpm-problem.445180/#post-153072456
- https://www.dsmtuners.com/threads/how-to-fix-your-idle-surge-problem.191137/

 

[chrysler kid]

It could be anything

Is the car still stock?
Does it throw a check engine light eventually?

If it runs better with the maf UN plugged that typically means there is a vacuum leak.

 

[jmgonz]

It could be anything

Is the car still stock?
Does it throw a check engine light eventually?

If it runs better with the maf UN plugged that typically means there is a vacuum leak.

Only modifications are blow off valve and exhaust, there are no codes.