I'm having a idle and hesitation prob with my 94 GSR. When it idles down to normal idle it seems to fluctuate +/- about 150 rpm. It also hesitates at low RPM. Plugs seem to go to hell in a very short period of time. Lots of carbon. I think its to much fuel. Have a full Acell 300+ ignition system and NOSzzle nitrous setup. pulled a coolant line to the IM when nitrous was installed and never bled the coolant system, air bubbles are likely. I never drive the car and rarely have time to work on it but will bleed air out of coolant today and buy yet another set of plugs. Onlyothefr thought for the rich condition would be leaking fuel solenoid or faulty ignition system........Any thoughts or suggestions?

 

Bump.........Anyone? Finished bleeding air out of coolant, no help. hesitation does almost go away when engine has warmed up and run for awhile. engine speed also fluctuates when held at a slightly higher RPM, like 2000.

 

what's the fuel pressure at? what plugs are your running?

 

FPG reads about 42 w/stock fpr. Have AEM adjustable but removed to eliminate that as a possibility. Was also running Walbro 255lph hp pump but switched back to stock until I can figure out this prob. Put in new plugs and reset ECU after switching these back to stock. Ignition timing is good. Can an O2 sensor do this?

 

Stock heat range copper NGK plugs.........Anyone?

 

No suggestions?

 

air in the coolant system can definetley cause an erratic idle, and yes a faulty o2 an cause you to run rich. but you would throw a cel with a bad o2, so i would bleed the coolant system and see if that helps

 

Sorry, havn't updated that. I did bleed the coolant and no change in idle. It only idles eratically when very warm. When diagnostic plug is jumped(to set timing for example) idle fluctuation is more severe. When IACV is unplugged idle is lower but still fluctuates. Getting no CEL. Havn't changed plugs since redoing some slightly sketchy injector wiring(Damn 3M wire taps for previous Venom Nitrous kit)..........

 

check your IM. its OT iknow

 

OT? over torqued? Never pulled IM but pulled a throttle body mounting nut and sanwiched the bracket for my WOT switch there.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Green94GSR &raquo;</TD></TR><TR><TD CLASS="quote">OT? over torqued? Never pulled IM but pulled a throttle body mounting nut and sanwiched the bracket for my WOT switch there. </TD></TR></TABLE>

LOL, sorry should have been more punctual. i ment check your Instant Message (refresh so it pops up) i have an OT (offtopic) question