Boost Stutter/Hesitation Problem
#1
Boost Stutter/Hesitation Problem
Saturday at the track I started getting this stutter/hesitation when I was under lets say 75%+ load or so when in boost. Wideband reads the same from what I can tell, boost reads the same from what I can tell, but rpms just drop down to idle almost instantly and then rebound back and then hesitate, etc. Feels like slamming on the brakes for a second. It seems to be getting worse. Was only maybe 1 in 4 times getting into boost. Now its practically 4 out of 4 times. Stutter, then pops/gurgles after, then boost, then stutter then pops. Runs fine out of boost and at low psi/low load.
I am running MSPnP. Ignition problem? I haven't touched anything yet - I got home late last night and everything was super hot.
Is this descriptive enough?
I am running MSPnP. Ignition problem? I haven't touched anything yet - I got home late last night and everything was super hot.
Is this descriptive enough?
#9
thanks for the help so far guys. CAS and plugs are cheap and easy enough. I'd say I'm going to order both and see what happens. At the least I can eliminate them. The RPM graph will for sure show downward spikes. Its almost like someone shuts the car off for a second and starts it back up with the foot on the gas in boost.
Thanks Matt. I will still try and get you a data log.
Thanks Matt. I will still try and get you a data log.
#11
I had a similar issue; mine cropped up seemingly out of the blue. It drove fine out of boost and with light load but over 3-5 psi it would cut out it felt like the someone was slamming on the brakes.
I logged it and was getting occasional resets on the MS when it was misfiring(around ~60% of the time.)
My problem turned out to be the power wire to the starter. I had lost the cap for it about a month before and ended up wrapping it up with tape to keep it from potentially shorting out. I managed to get a little corner of the tape in between the contact and the wire and it managed to corrode enough or wiggle itself a little loose that it didn't get a great connection.
I pulled it off cleaned the connection bolted it down and haven't had a problem since.
I only checked it because I eliminated everything else and that was the last thing I had done the the car before it had issues.
It's worth a shot I suppose.
I logged it and was getting occasional resets on the MS when it was misfiring(around ~60% of the time.)
My problem turned out to be the power wire to the starter. I had lost the cap for it about a month before and ended up wrapping it up with tape to keep it from potentially shorting out. I managed to get a little corner of the tape in between the contact and the wire and it managed to corrode enough or wiggle itself a little loose that it didn't get a great connection.
I pulled it off cleaned the connection bolted it down and haven't had a problem since.
I only checked it because I eliminated everything else and that was the last thing I had done the the car before it had issues.
It's worth a shot I suppose.
#12
I had a similar issue; mine cropped up seemingly out of the blue. It drove fine out of boost and with light load but over 3-5 psi it would cut out it felt like the someone was slamming on the brakes.
I logged it and was getting occasional resets on the MS when it was misfiring(around ~60% of the time.)
My problem turned out to be the power wire to the starter. I had lost the cap for it about a month before and ended up wrapping it up with tape to keep it from potentially shorting out. I managed to get a little corner of the tape in between the contact and the wire and it managed to corrode enough or wiggle itself a little loose that it didn't get a great connection.
I pulled it off cleaned the connection bolted it down and haven't had a problem since.
I only checked it because I eliminated everything else and that was the last thing I had done the the car before it had issues.
It's worth a shot I suppose.
I logged it and was getting occasional resets on the MS when it was misfiring(around ~60% of the time.)
My problem turned out to be the power wire to the starter. I had lost the cap for it about a month before and ended up wrapping it up with tape to keep it from potentially shorting out. I managed to get a little corner of the tape in between the contact and the wire and it managed to corrode enough or wiggle itself a little loose that it didn't get a great connection.
I pulled it off cleaned the connection bolted it down and haven't had a problem since.
I only checked it because I eliminated everything else and that was the last thing I had done the the car before it had issues.
It's worth a shot I suppose.
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