What's going on everyone. I have a surging problem after I installed 310 r/c injectors on my car. The engine surges from 1000 to 1500 rpm's. I've checked just about everything as far as vacuum leaks goes, checked the fast idle valve, iac motor, etc. The car doesn't have the cel light on. Still have the stock ecu. Just did the inj. to experiment. Could my problem be running too rich at idle? Thanks for all the help.

 

you've got a set of injectors that are of different size then your ecu is calibrated to control.

hmmmm I wonder....

 

well, what is your setup? what are you doing for fuel management?

 

nothing from the sound of it, just stock ecu with 310 injectors

 

your gonna need something to scale down those injectors.

 

Found the problem. Where the injectors go into the intake manifold there are 2 types of grommets. 1 that is soft and 1 that is some type of hard rubber. How come I have 2 different types? Don't know, but anyway, had a huge vacuum leak from the base of the injectors. Installed the right grommets and now no more surging. Thanks

 

yep definitley sounded like a vacuum leak. THe idle wouldn't surge, it would be very rough with the bigger injectors.

 

Yeah, you aren't lying about the rough idle.