Losing power up top
Thread Starter
TECH Resident
Joined: Oct 2008
Posts: 966
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From: Redondo Beach, CA
Losing power up top Sometimes when i give it a little gas just below 2000 RPM, it will seem to drop on power for a few seconds. This has been prevalent for a while - but last night I jammed on it in 2nd gear from 2000rpm to 5000rpm and nearing 5000rpm it lost power. RPMs kept pulling and it didn't break up, the power just went away.
Thoughts? Opti? Wires?
Thanks guys.
Thoughts? Opti? Wires?
Thanks guys.
Sometimes when i give it a little gas just below 2000 RPM, it will seem to drop on power for a few seconds. This has been prevalent for a while - but last night I jammed on it in 2nd gear from 2000rpm to 5000rpm and nearing 5000rpm it lost power. RPMs kept pulling and it didn't break up, the power just went away.
Thoughts? Opti? Wires?
Thanks guys.
Thoughts? Opti? Wires?
Thanks guys.
No mis-firing - its more likely that you have a fueling, breathing or timing issue that a bad opti or wires - both of those will usually cause an actual, perceptible skip, rather than a fade in power. Heavy knock retard can be noticable like that, but so can leaning out on weak fuel delivery. Weak fuel is real noticable on quick throttle tip ins (stabbing the gas) and at high rpm where fuel demand is up. Heck, leaning out usually causes knock, timing is pulled, so you really feel it. I'd fuel pressure first, and if that checks out you might want to try a scan tool to see if you can identify whats going on.
Last edited by acammer; Apr 2, 2010 at 02:43 PM.
Thread Starter
TECH Resident
Joined: Oct 2008
Posts: 966
Likes: 0
From: Redondo Beach, CA
^^ thanks for the info.
The car is actually running rich, had a buddy driving behind me recently when I went WOT and he mentioned he could smell the fuel ... lol. But I will check the fuel pressure.
The car is actually running rich, had a buddy driving behind me recently when I went WOT and he mentioned he could smell the fuel ... lol. But I will check the fuel pressure.
Teching In
Joined: May 2009
Posts: 7
Likes: 0
From: Waterloo,IA
Friday I took my fresh rebuilt lt1 383,12-1 compression. stroker to get tuned and lost power at 5700 due to engine knock now we are looking at the valve springs and octane. I also had a bad o2 sensor witch I fixed today.
