surging at idle need help, cant find whats wrong!
#1
surging at idle need help, cant find whats wrong!
surging at idle... seems like its missing.. kinda jumps from 350-750 rpms at idle... doens't always do it.. just when i slow down really quick or kinda give it a lil gas then back off.. doesn't seem to be able to catch up with the inputs or something.. cuts off from time to time.. have msd wires fairly new, changed plugs, checked coil packs, nothing helps.. unplugged maf, nothing changed at all.. old plugs i pulled out were kind of a browing red burnt lookin color.. i have no idea whats wrong, im thinking its the mass air flow sensor, but i really have no clue, car has a 3000 stall, i dunno if that could be causing it somehow.. any ideas?
#7
I have seen the same thing on my car with the O2s each around 100 while cold. Still, I doubt that there was too much fuel. I added fuel and it actually seemed better. There needs to be more info on these idle issues...
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#9
Originally Posted by WILWAXU
Have you unplugged the battery?
Could be that the car hasn't completed an idle re-learn.
Could be that the car hasn't completed an idle re-learn.
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Back to Redrocket's car...I logged it tonight with hptuners and this was what I gathered. O2's look excellent, fueling looks great. Fuel trims look fine, no vacuum leaks. The car seems to misfire like its going to cut off (lights flicker rpms drop) about every 10 seconds or so. Misfires dont seem to increase with rpms, but Cylinder 4 had a really large misfire history compared to the other cylinders. Doesn't seem to be a fueling issue to me at all, seems to be spark related.
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Originally Posted by Another_User
Yep. Many times.
One last thing I saw was the spark tables, both base in drive and and high octane had a spread of from -11 degress to +18 degrees in the area of where this oscillation is taking effect. Since you disproved that as being a factor by locking your timing I would assume it's an out of sync servo at the intake until I try that and it doesn't work