low throttle stutter

psmvchaser

psmvchaser

Member
At about 10% throttle I am getting a stutter, almost like it is not getting enough fuel and it wants to stall. If I give it more gas it is fine. It is especially bad from 5-10 mph at low throttle.

If I just give it more gas, it runs like a champ. At WOT it is awesomely fast w/ no problems whatsoever. It is only when I am slowly cruising/accelerating.

I have an afpr and walbro. The base fuel pressure is set at 50. I am running a custom open loop 3 bar chip that is set to about 17 psi. Everything was running fine with the current setup, until about 2 weeks ago.

Anyone have any ideas on what I could do/change/look for?

Thanks for any tips.

Ken
 
G

GM TURBO

Sell Out
Well, I don't know where you live - weather change?

FP sounds high to me. I had a problem where mine would seem as though it wasn't getting enough fuel - when it was the opposite. I turned the FP down a touch and it seemed to help out quite a bit.
 
S

skata

Donating Member
it could also be the throttle position sensor.
do you have datamaster? if so, then you can use it to see if it is sending the right signal.
 
psmvchaser

psmvchaser

Member
tps

tps

I do have datamaster, I have noticed the tps readout before, but what do I look for/how do I read it?

I would'nt know if it was getting an improper reading.
 
turbodog

turbodog

Donating Member
you should see linear relationship between throttle position and TPS reading (in volts or % throttle). Look for a spot just off idle where the reading jumps (high or low).
 
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