Originally posted by WA2FAST:


I did the IMRC replacement and everything works great now. No more egg stink from the exhaust, no more cold run issues, better gas mileage, so on and so forth. I couldn't ask more for only spending 30 min on the car.



To my understanding, the IMRC only controls the secondaries that are only open when the engine is at high RPMs. How can the IMRC help with egg stink in the exhaust, cold run issues, and better gas mileage? The only thing you should have noticed is better performance above 4,000 RPM. I replaced my IMRC and the only improvement I got was much better performance above 4,000 RPM. If you drive much over 4000 RPM like I do, using the secondaries decreases your gas mileage over not using them. I was averaging 25 miles per gallon without the IMRC and now I am back down to 23 miles per gallon after I replaced my IMRC. Yes the performance is much better but I now use more gas when I push the car over 4000 RPMs. I am just not sure how you were able to get all those improvements by just replacing the IMRC.