Power loss between 5500 and 5700
Re: Power loss between 5500 and 5700 [quote]Originally posted by cool Z:
<strong>Bad habit, autotap would show #1 and/or #5 and sometimes one or two others mis-firing. No codes or SES tho. Also, It would lose power at 5600 RPM's at part throttle in any gear. Just accelerate and give it enough gas to get it to rev that high and man I tell you it was like it hit a brick wall on the tach and it felt like the brakes were engaging <img src="graemlins/gr_barf.gif" border="0" alt="[barf]" /> . Definately more noticable than WOT runs. Give it a try!!!</strong><hr></blockquote>
Thanks for all your help...
Well, we did the part throttle test today and it reved clean up to 6k with no problems.. We are going to do some more atap's tomorrow...
<strong>Bad habit, autotap would show #1 and/or #5 and sometimes one or two others mis-firing. No codes or SES tho. Also, It would lose power at 5600 RPM's at part throttle in any gear. Just accelerate and give it enough gas to get it to rev that high and man I tell you it was like it hit a brick wall on the tach and it felt like the brakes were engaging <img src="graemlins/gr_barf.gif" border="0" alt="[barf]" /> . Definately more noticable than WOT runs. Give it a try!!!</strong><hr></blockquote>
Thanks for all your help...
Well, we did the part throttle test today and it reved clean up to 6k with no problems.. We are going to do some more atap's tomorrow...
Re: Power loss between 5500 and 5700 my car revs fine at part throttle too <img src="images/icons/confused.gif" border="0">
looks like me and F1 are having the same problem because mine runs perfect while under part throttle and not at WOT.
F1 if you find out anything please let me know and I will do the same.
sean
[ February 05, 2002: Message edited by: Bad Habit Bird ]</p>
looks like me and F1 are having the same problem because mine runs perfect while under part throttle and not at WOT.
F1 if you find out anything please let me know and I will do the same.
sean
[ February 05, 2002: Message edited by: Bad Habit Bird ]</p>
Thread Starter
On The Tree
Joined: Nov 2001
Posts: 157
Likes: 0
From: DFW,TX
Re: Power loss between 5500 and 5700 Could be the springs are not as weak as mine were. If you both have swapped injectors around and moved coil packs and plug wires, the only other thing after ruling out fuel and fire is compression. If an intake valve is floating open, it will push some of the air/fuel back out of the cylinder on compression stroke. The cylinders affected will not contribute to horsepower but not mis so bad that the PCM overlooks it as a hard mis-fire and does not illuminate the SES light. Basically it's not truly missing. How many miles are on both of your cars. My problem started at 6500 miles intermitantly and it was consistant in 3rd and 4th gear and noticable in 2nd at around 8300 miles (12 dyno's, 24 logged 1/4 passes and ???? WOT runs on the street). And yes stock push rods are fine with LS6 springs. If ya'll have tried everything, I would give springs a try. It was a shot in the dark for me too. But' it paid off nicely <img src="gr_grin.gif" border="0"> <img src="gr_grin.gif" border="0"> <img src="graemlins/fluffy.gif" border="0" alt="[Fluffy]" />
<img src="graemlins/camaro.gif" border="0" alt="[Chevrolet]" />
[ February 06, 2002: Message edited by: cool Z ]</p>
<img src="graemlins/camaro.gif" border="0" alt="[Chevrolet]" />
[ February 06, 2002: Message edited by: cool Z ]</p>
Re: Power loss between 5500 and 5700 my car has 14,000 miles on it right now. Mine is actually throwing a missfire code though <img src="gr_sad.gif" border="0">
did yours seem to do it worse when the motor was all the way warmed up? Mine doesnt seem to be as bad when the motor is at around 160 or so and not fully warmed up.
did yours seem to do it worse when the motor was all the way warmed up? Mine doesnt seem to be as bad when the motor is at around 160 or so and not fully warmed up.
Thread Starter
On The Tree
Joined: Nov 2001
Posts: 157
Likes: 0
From: DFW,TX
Re: Power loss between 5500 and 5700 I never really noticed. I baby it untill the engine is op temp, and the trans and rear have been turning for a while (approx 5 mi). I like the fluids to be at least warm before I jump on it.
Re: Power loss between 5500 and 5700 The car I am trying to figure this out on is a friends, ’00 SS with 40k miles and about 800 ¼ mile passes on it. This was never an issue till we put a set of MAC headers on. We put it on the computer last night again. IT seems to do it worse under hard 1,2 and 3,4 shifts. IF you ease the shifts under WOT it is better or non existent. What does this say? In my mind it is KR, but sometimes it will hesitate and show no KR…. Timing is right around 27-28.. I am having a hard time accepting that it is valve springs. His next mod was going to be a cam so maybe he will have to do it sooner than he wanted. I wonder if the belt slipping can cause this type of condition, or something somehow related to the 98-99 style EGR pipe installed to accommodate the MAC headers or just the Headers themselves….. I know I reaching here but I am running out of ideals.. Cool Z if it is indeed the valve springs you are going to owe me a BIG “I told you so”…..
Re: Power loss between 5500 and 5700 I am in the same boat as F1 except with not so many miles. Mine however seems to be the worst whenever you ease into the throttle <img src="images/icons/confused.gif" border="0"> I am going to be putting the factory pulley back on the car tomorow and see what that does.
Ill let you know if it works out for me.
sean
Ill let you know if it works out for me.
sean
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Verdad Gallardo Thread Starter
On The Tree
Joined: Nov 2001
Posts: 157
Likes: 0
From: DFW,TX
Re: Power loss between 5500 and 5700 I was fighting a pinging issue and I thought the KR was responsible for the power loss. HPP3 and 160* stat later the pinging was gone. But then I noticed this power loss was still there with 0 KR.
That's when all the fun started. Let me know, I'm interested to see the fix for both of your problems.
That's when all the fun started. Let me know, I'm interested to see the fix for both of your problems.
TECH Apprentice
Joined: Nov 2001
Posts: 398
Likes: 0
From: Sterling Heights Mi
Re: Power loss between 5500 and 5700 I'm like F1 too <img src="gr_sad.gif" border="0"> If I bang a gear hard it stumbles, but not all the time. If I shift not so hard it's fine. It literally feels like I lifted the throttle, and then I look at the scanmaster, and no KR, and then all of a sudden it starts pulling again <img src="images/icons/confused.gif" border="0">