Need Help After LS1 Hot Cam Installation
Re: Need Help After LS1 Hot Cam Installation Those sound like standard issues with a cam such as yours. The P0300 code is certainly due to the PCM misinterpreting the lope as misfires. Other than removing the code via programming, about all you can do is avoid extended idling or if you're stuck in traffic maybe blip the throttle from time to time.
I have the same hot start issue every so often with the hotcam - seems its not uncommon either. Have you Autotapped the car since the install? If not you may want to check your IAC counts to see if they are elevated (down below 30-35 is recommended). This can contribute to poor idle/stalling and slightly enlarging the throttle body hole will help. Also, you may find yourself running rich at WOT with the new cam, which can be alleviated with a MAFT or programming.
<small>[ April 17, 2002, 01:15 PM: Message edited by: Fulton 1 ]</small>
I have the same hot start issue every so often with the hotcam - seems its not uncommon either. Have you Autotapped the car since the install? If not you may want to check your IAC counts to see if they are elevated (down below 30-35 is recommended). This can contribute to poor idle/stalling and slightly enlarging the throttle body hole will help. Also, you may find yourself running rich at WOT with the new cam, which can be alleviated with a MAFT or programming.
<small>[ April 17, 2002, 01:15 PM: Message edited by: Fulton 1 ]</small>
Teching In
Joined: Nov 2001
Posts: 18
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From: OH
Need Help After LS1 Hot Cam Installation We just installed this cam (.525"/.525" lift, 218/227 degrees duration @ .050" lift), along with an LS6 intake manifold. The car feels VERY strong now, but has two small problems. Wondering if anyone else has experienced these, and what possible solutions are out there.
1) Idle is pretty lopey, and DTC P0300 (random/multiple misfire detected) will set after extended idle periods. From what I've read on this board it looks like this might be standard?
2) Idle speed seems too low and/or lean on hot restarts, making the car not want to start at all, and then once it does it will barely stay running unless given a little gas-same goes from stopping in traffic when hot. Cold starts seem to be fine.
The car runs fantastic except for the two above problems, and even those seem more like anoyances than actual problems. Also, there are no codes being set at all, other than the P0300 after extended idle periods.
Any input will be appreciated. Thanks!
1) Idle is pretty lopey, and DTC P0300 (random/multiple misfire detected) will set after extended idle periods. From what I've read on this board it looks like this might be standard?
2) Idle speed seems too low and/or lean on hot restarts, making the car not want to start at all, and then once it does it will barely stay running unless given a little gas-same goes from stopping in traffic when hot. Cold starts seem to be fine.
The car runs fantastic except for the two above problems, and even those seem more like anoyances than actual problems. Also, there are no codes being set at all, other than the P0300 after extended idle periods.
Any input will be appreciated. Thanks!
Teching In
Joined: Nov 2001
Posts: 18
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From: OH
Re: Need Help After LS1 Hot Cam Installation Thanks for the advice, we will autotap the car this Saturday, use the HPP3 and work on the throttle body. Hopefully that will keep me from having to dance at stop lights!
Re: Need Help After LS1 Hot Cam Installation where in ohio are you from? i'm planning on doing a hotcam and ls6 intake as well... <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
Re: Need Help After LS1 Hot Cam Installation Ditto what Fulton said. Everything sounds normal. My car behaved the same as yours after the install. It fired right up, but staggered a little. Drilling out the hole in the throttle body helped a lot, it didn't increase the idle speed, it just feels like the car is getting air easier.
Good Luck!
Good Luck!
TECH Enthusiast
Joined: Nov 2001
Posts: 712
Likes: 1
From: Dallas,Texas
Re: Need Help After LS1 Hot Cam Installation All normal.. car seems to have above problems
all last summer. This winter it acted much better. I have now installed a 160F thermostat
( free thermstat mod http://ls1info.com/article.php?sid=180 )
and added a fan switch mod and an redundant temp
gauge.
On thing I can highly recomment is the trooper mod (tm) glue a shim .022" ( is mine ) inbetween
the trottle set screw and the throttle mecanism.
go to big and you will set idle high codes..
this fixed the die at stop lights problem I was
having with AC on ..
all last summer. This winter it acted much better. I have now installed a 160F thermostat
( free thermstat mod http://ls1info.com/article.php?sid=180 )
and added a fan switch mod and an redundant temp
gauge.
On thing I can highly recomment is the trooper mod (tm) glue a shim .022" ( is mine ) inbetween
the trottle set screw and the throttle mecanism.
go to big and you will set idle high codes..
this fixed the die at stop lights problem I was
having with AC on ..
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11 Second Club
Joined: Nov 2001
Posts: 300
Likes: 1
From: Central Florida
Re: Need Help After LS1 Hot Cam Installation That's normal for the hot cam. I'm finally getting a program done to alleviate the problems... you can prevent the P0300 code by blipping the throttle periodically if you're going to idle for prolonged periods (greater than 60 seconds). Just a slight goose of the throttle to 1000-1200 RPM's will keep the PCM from detecting the misfire. I just got dynoed last weekend, numbers are in the sig... this is before the program and LS6 intake, which are not in yet... I should get to just about 400-RWHP on stock heads!!
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On The Tree
Joined: Feb 2002
Posts: 111
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From: Plano, TX
Re: Need Help After LS1 Hot Cam Installation I had similar problems with my setup, using an LS1 HOT cam, ARE S1 heads, and a S2 throttle body. I got rid of all check engine codes and was able to smooth out the idle a bit by maxing out the idle set screw on the underside of the throttle body. You can either remove the throttle body to set it, or do what I did:
Pick up a T15 Torx screwdriver bit and lock it into a set of vise-grip locking needle-nosed pliers at an angle. Place the locked Torx bit into the set screw, undo the throttle cable and hold the cam back with one hand while tightening up the idle set screw underneath the throttle body. Your idle level is still controlled by the PCM, so idle speed won't increase by much, but feeding the motor more air through the throttle plate really helped to smooth the idle out. I could let it idle for 5 minutes straight without a DTC. Hope this helps!
Pick up a T15 Torx screwdriver bit and lock it into a set of vise-grip locking needle-nosed pliers at an angle. Place the locked Torx bit into the set screw, undo the throttle cable and hold the cam back with one hand while tightening up the idle set screw underneath the throttle body. Your idle level is still controlled by the PCM, so idle speed won't increase by much, but feeding the motor more air through the throttle plate really helped to smooth the idle out. I could let it idle for 5 minutes straight without a DTC. Hope this helps!
Teching In
Joined: Nov 2001
Posts: 18
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From: OH
Re: Need Help After LS1 Hot Cam Installation Wow! Thanks for all of the advice guys. My significant other specializes in 3800 performance not LS1 performance, so I had to reach out to get a clue! <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />
Hopefully I can dyno it this weekend if we can keep it running...
Hopefully I can dyno it this weekend if we can keep it running...
TECH Resident
Joined: Dec 2001
Posts: 922
Likes: 1
From: Lexington Park, MD
Re: Need Help After LS1 Hot Cam Installation I just started mine today for the first time since the install (been waiting all week <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> and wow.. definitely a different car and will take a bit to get used to. It set a P0300 within a few minutes which I expected. Then after letting it warm up, I shut it down and wanted to see how bad the warm starts were. Yep, pretty rough. Ah well, small price to pay for that badass lope <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Re: Need Help After LS1 Hot Cam Installation 98blackSS,
Do make a point to Atap it (if you haven't done so already <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> ). Mine would barely run at all at first and set a P0300 right off the bat, but after enlarging the TB hole and resetting the PCM it became downright streetable (well, just remember to take it out of gear as you come to a stop if its an M6). Now, when warmed up, my IAC counts are down around 15-25 and it rarely ever wants to die anymore - even with stock idle around 800rpm. I've got about 2500 miles on the cam and for the most part it is very complacent. Every once in a while the hot starts still give it a bit of trouble and the slow parking lot maneuvers are not recommended, but other than that its no problem (this is with M6 and TB hole at 15/64" diameter and that's it).
Do make a point to Atap it (if you haven't done so already <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> ). Mine would barely run at all at first and set a P0300 right off the bat, but after enlarging the TB hole and resetting the PCM it became downright streetable (well, just remember to take it out of gear as you come to a stop if its an M6). Now, when warmed up, my IAC counts are down around 15-25 and it rarely ever wants to die anymore - even with stock idle around 800rpm. I've got about 2500 miles on the cam and for the most part it is very complacent. Every once in a while the hot starts still give it a bit of trouble and the slow parking lot maneuvers are not recommended, but other than that its no problem (this is with M6 and TB hole at 15/64" diameter and that's it).
TECH Apprentice
Joined: Nov 2001
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From: Williamsburg, VA
Re: Need Help After LS1 Hot Cam Installation Get LS1Edit and raise the idle speed to 950-1000, delete the misfire codes. That alone will make a world of difference. Then play with the other features to fine tune your timing, LTrims and WOT A/F ratio.
Teching In
Joined: Nov 2001
Posts: 18
Likes: 0
From: OH
Re: Need Help After LS1 Hot Cam Installation Drilling out the throttle body made a huge difference. IAC counts were at 90, no wonder I could not keep it running! It actually stays running when started hot now.
Unfortunately due to rain, I could not dyno today.
Thanks again for all of your input!
Unfortunately due to rain, I could not dyno today.
Thanks again for all of your input!
TECH Resident
Joined: Dec 2001
Posts: 922
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From: Lexington Park, MD
Re: Need Help After LS1 Hot Cam Installation </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Fulton 1:
<strong>98blackSS,
Do make a point to Atap it (if you haven't done so already <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> ). Mine would barely run at all at first and set a P0300 right off the bat, but after enlarging the TB hole and resetting the PCM it became downright streetable (well, just remember to take it out of gear as you come to a stop if its an M6). Now, when warmed up, my IAC counts are down around 15-25 and it rarely ever wants to die anymore - even with stock idle around 800rpm. I've got about 2500 miles on the cam and for the most part it is very complacent. Every once in a while the hot starts still give it a bit of trouble and the slow parking lot maneuvers are not recommended, but other than that its no problem (this is with M6 and TB hole at 15/64" diameter and that's it).</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Strange, I was under the impression that the P0300's would always be around unless you got the codes masked out with LS1edit. After drilling the TB out to 13/64 (I bought a 13/64 and a 15/64 drill bit) and setting the idle screw a TINY bit up, I no longer get any stalls or codes. Is this normal? Seems too good to be true.
<strong>98blackSS,
Do make a point to Atap it (if you haven't done so already <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> ). Mine would barely run at all at first and set a P0300 right off the bat, but after enlarging the TB hole and resetting the PCM it became downright streetable (well, just remember to take it out of gear as you come to a stop if its an M6). Now, when warmed up, my IAC counts are down around 15-25 and it rarely ever wants to die anymore - even with stock idle around 800rpm. I've got about 2500 miles on the cam and for the most part it is very complacent. Every once in a while the hot starts still give it a bit of trouble and the slow parking lot maneuvers are not recommended, but other than that its no problem (this is with M6 and TB hole at 15/64" diameter and that's it).</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Strange, I was under the impression that the P0300's would always be around unless you got the codes masked out with LS1edit. After drilling the TB out to 13/64 (I bought a 13/64 and a 15/64 drill bit) and setting the idle screw a TINY bit up, I no longer get any stalls or codes. Is this normal? Seems too good to be true.
Re: Need Help After LS1 Hot Cam Installation </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Strange, I was under the impression that the P0300's would always be around unless you got the codes masked out with LS1edit.</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I wasn't trying to imply that drilling the TB would remove the P0300 code - that is not the case - it does, however, reduce the tendancy to stall, etc. Only programming such as LS1Edit will eliminate the code as far as I know. Sorry for the confusion.
TECH Resident
Joined: Dec 2001
Posts: 922
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From: Lexington Park, MD
Re: Need Help After LS1 Hot Cam Installation </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Fulton 1:
<strong> </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Strange, I was under the impression that the P0300's would always be around unless you got the codes masked out with LS1edit.</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I wasn't trying to imply that drilling the TB would remove the P0300 code - that is not the case - it does, however, reduce the tendancy to stall, etc. Only programming such as LS1Edit will eliminate the code as far as I know. Sorry for the confusion.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Nah, I knew what you meant <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> . I was just speaking in general - that it seemed strange that I haven't set a code since doing these two things. I assumed that the P0300 codes would always be around. Maybe I haven't driven it enough yet. I still need to check out my IAC count though just to see where it's at. Even though I haven't had it stall since, it does seem like it wants to stall in certain situations. Almost, but not quite. Maybe I'll try the 15/64 just for the hell of it.
<strong> </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Strange, I was under the impression that the P0300's would always be around unless you got the codes masked out with LS1edit.</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I wasn't trying to imply that drilling the TB would remove the P0300 code - that is not the case - it does, however, reduce the tendancy to stall, etc. Only programming such as LS1Edit will eliminate the code as far as I know. Sorry for the confusion.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Nah, I knew what you meant <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> . I was just speaking in general - that it seemed strange that I haven't set a code since doing these two things. I assumed that the P0300 codes would always be around. Maybe I haven't driven it enough yet. I still need to check out my IAC count though just to see where it's at. Even though I haven't had it stall since, it does seem like it wants to stall in certain situations. Almost, but not quite. Maybe I'll try the 15/64 just for the hell of it.
