The Top DSM Community on the Web

For 1990-1999 Mitsubishi Eclipse, Eagle Talon, Plymouth Laser, and Galant VR-4 Owners. Log in to remove most ads.

Please Support Kiggly Racing
Please Support STM Tuned

surging while crusing

This site may earn a commission from merchant
affiliate links, including eBay, Amazon, and others.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

gofast63

10+ Year Contributor
382
28
Apr 22, 2011
Manchester, Michigan
I can seem to figure this out. I've took care of all of my boost leaks and checks plug and gaped them to .28, cleaned fuel injectors, its a rebuilt engine, I'm now running my 550cc injectors and had this same problem with the 450cc. Coil packs new, rebuilt throttle body, rebuilt turbo, replaced seal on biss screw. My wideband hits 16 while crusing when it surges.
 
More than likely you are hitting fuel cut. Check your idle position switch and tps sensor. Your ecu might be thinking that the car is idling when you are cruising and it will try to lower the rpms and one way it can do this is by cutting fuel hence why you are leaning out.

Does the car surge at all during idle?

try cruising at speeds below 1200 rpm and above 1500 rpm. Report back if it only surges and leans out at speeds above 1200 or 1500 rpm?

Does it surge if your throttle is at 20% or only surges if the throttle is at 2%-8% ?

16:1 afr is not good when cruising aim for a range of 14.4-15.2
 
Support Vendors who Support the DSM Community
Boosted Fabrication ECM Tuning ExtremePSI Fuel Injector Clinic Innovation Products Jacks Transmissions JNZ Tuning Kiggly Racing Morrison Fabrications MyMitsubishiStore.com RixRacing RockAuto RTM Racing STM Tuned

Latest posts

Build Thread Updates

Vendor Updates

Latest Classifieds

Back
Top