Thread: seeking advice on Hesitation during acceleration

checked the wiring and all are checking out with no issues, i checked the voltage on the signal wire and at idle i am getting 1.7 and when i accelerate to 2000 or so rpms i am getting 2.5 volts. when i held it at around 2k rpm i could hear the hesitation but not see any fluctuation on the voltages.
i have already removed the maf and sprayed it with cleaner - i will remove it again to visually inspect it and see if i see anything wrong.

the volts were spot of 14.1 volts with engine running and voltage drop was .016 volts on the ground.

Shall i remove and clean out the IIACV module?

the fsm states the following - if at 2.5 volts would that be the issues with the hesitation? or shall i keep checking over things.

I think the MAF is a good start.

i bought a used maf to test but its still in the shipping phase,

i was able to take a video of what sounds like when its bogging out. you will have to turn the volume up so you can hear the tone change in the exhaust.

Hesitation sr20ve - YouTube

lil update for anyone that might care...

installed a different MAF and the car improved a little but but still didnt totally resolve the weird hesitation that i have been noticing.

installed a new walboro 255 fuel pump, once again improved the car a little more but had no effect on the hesitation at all.

next move is to swap out the dizzy to the DE set up but i threw again all the connectors (which totally sucks), i am going to need to get those before i can swap out the dizzy.

In the mean time i also plan on removing the TB and clean it up to see if that has any effect.

What's happening with your fuel pressure and ratios when it hesitates? When I was running the stock ecu on mine I would get something similar happening and my fuel ratios would suddenly jump way lean.

seems crazy but if you have a egr/bpt valve, check the vac hosese...my car was a dog from stop...after diving into the egr delete, i noticed the vac line between the egr & bpt was blown open/melted... after fixing it launched like a dream

Having a similar issue with my VE. It's in the tune.

My car behaves the same reaching redline and there is a lean spot according to my wideband.

Will be making adjustments tomorrow.

I started noticing a similar issue in my car about a week ago..but mine is while at cruising speed(normally 60-70 mph) with almost no load,
you can feel an oscillation of power. I'm also running the VE dizzy, under load the car behaves normal, but this is a bit annoying while cruising.

I resolved my issue. I re checked my base timing which was for some reason a bit to advanced. I re adjusted it and have no issues.

I'm guessing you checked base timing already? Well check it again These sr20's are so finicky with timing.

I also had issues at part throttle right after I got my VE running. All lead to the distributor not being set correctly.

Solved mine too! Started checking the timing and the NEMU was not synched as i forgot to do this after a new .tcd upload...duh!. Timing was way off, adjusted that and still had the hunting/fluctuating idle. Looked over the whole settings in Nismotronic and found out that I had closed loop enabled. Un-checked that box and voila! everything is good. Idle is at 900 rpm and smooth during cruising.