cliffo

my friend has a 93 fd and at idle in neutral when the fan kicks on the engine surges between 800-3000 rpms erratically.anyone have any ideas where to look or have a similar problem?any info woul be greatly appreciated. thanks,cliff

dubulup

what ECU are you using? Could be fuel correction map for battery voltage is wack

cliffo

it is running a m2 comp.

jpandes

Could be bad grounds.

cliffo

thats what i was guessing as a suspect.how do i find out where or should i try running a ground strap from the engine?any ideas?

Narfle

iTrader: (16)

im pretty sur eits a vacuum leak b/c pretty much the same hting happened ot me. it would also surge badly when my lights were on.

1QWIK7

iTrader: (33)

i have the same problem except the problem only occurs when my headlights are up and when im in gear trying to drive..im still trying to diagnose the problem..ill let you know if i find anything..

mad_7tist

el load system prob. shity iac, poor alt performance