Big problem... any help? *video*
01-18-2005, 08:15 AM
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Big problem... any help? *video* All differences aside.
Started up car.. shoots to redline.
What can cause this? Just got done with a cam install and such... and we started the car and it immeditately shoots to around 3800... and surges around 3800 bad. Then after 3-4 seconds it will fall to about 500.. idle for just a second.. then die.
If it was a vacuum leak it would mantain the high revs? Instead of falling off and then dying would it not? If you touch the throttle at all while its hanging around 500 it will try and shoot back up to around 3800.
Car is a 2000 LS1
Mods are FM14 cam.. dual springs... Ls6 intake.....
Any help soon ASAP pls.
Aside from a huge vacuum leak.. what else could cause this?
http://s93322652.onlinehome.us/problem.wmv Here is a video of the problem. In the second part of the video that is the car revving itself.. not us doing it. We eventually just had to cut it off.
Started up car.. shoots to redline.
What can cause this? Just got done with a cam install and such... and we started the car and it immeditately shoots to around 3800... and surges around 3800 bad. Then after 3-4 seconds it will fall to about 500.. idle for just a second.. then die.
If it was a vacuum leak it would mantain the high revs? Instead of falling off and then dying would it not? If you touch the throttle at all while its hanging around 500 it will try and shoot back up to around 3800.
Car is a 2000 LS1
Mods are FM14 cam.. dual springs... Ls6 intake.....
Any help soon ASAP pls.
Aside from a huge vacuum leak.. what else could cause this?
http://s93322652.onlinehome.us/problem.wmv Here is a video of the problem. In the second part of the video that is the car revving itself.. not us doing it. We eventually just had to cut it off.
01-18-2005, 08:42 AM
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Originally Posted by Tim98TA
vacuum leak
Most vacuum leaks I have heard of only send the car to around 1400-1500 at idle.... how could this leak be so bad that it would cause a 3800? Almost as if the car is at half throttle leak?
Seems to me if it was a vacuum leak it would hang at 3800 steady? Instead of after a second or so falling back off to an idle of 500 or so.. and then dying.
01-18-2005, 01:23 PM
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Originally Posted by DietCoke
Close the throttle body.
Throttle body was closed...
The map sensor on the back of the intake was broken out of place.. what I mean is that it was still in.... but it wasnt locked in place like it normally was.. could this cause a problem? The ls6 intake was like this once I got it back from being stolen
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01-18-2005, 04:34 PM
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http://www.cartalk.com/content/colum...anuary/08.html
Found this doing a search.. my coolant temperature sensor broke when we removed the heads.. is it possible since its messed up it would cause a high idle?
Found this doing a search.. my coolant temperature sensor broke when we removed the heads.. is it possible since its messed up it would cause a high idle?
01-18-2005, 04:47 PM
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Originally Posted by SS346Ls1
http://www.cartalk.com/content/colum...anuary/08.html
Found this doing a search.. my coolant temperature sensor broke when we removed the heads.. is it possible since its messed up it would cause a high idle?
Found this doing a search.. my coolant temperature sensor broke when we removed the heads.. is it possible since its messed up it would cause a high idle?
Your coolant temp switch wouldnt have anything to do with the high idle. Either your TB is not closed all the way (which you said you checked), your TPS sensor has gone bad (which you havent checked) you have a MAJOR vaccum leak (prolly a crack in the back of the manifold where the map sensor goes) or you forgot to plug the vaccum line right next to the map sensor.
01-18-2005, 05:49 PM
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Originally Posted by BLKWS6
Even though your an *******......
Your coolant temp switch wouldnt have anything to do with the high idle. Either your TB is not closed all the way (which you said you checked), your TPS sensor has gone bad (which you havent checked) you have a MAJOR vaccum leak (prolly a crack in the back of the manifold where the map sensor goes) or you forgot to plug the vaccum line right next to the map sensor.
Your coolant temp switch wouldnt have anything to do with the high idle. Either your TB is not closed all the way (which you said you checked), your TPS sensor has gone bad (which you havent checked) you have a MAJOR vaccum leak (prolly a crack in the back of the manifold where the map sensor goes) or you forgot to plug the vaccum line right next to the map sensor.
My MAP sensor was broken a bit.. not broken off but it wobbles and turns because the bracket had broken.. could this cause any problems? The map sensor is still in the hole and still seems to seal well.
01-18-2005, 06:40 PM
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A quick way too check for a vacuum leak is to use carb/choke cleaner and spray at any possible areas where a leak can occur, when you spray at the leak the idle will change dramaticly.
01-18-2005, 06:45 PM
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Originally Posted by SS346Ls1
My MAP sensor was broken a bit.. not broken off but it wobbles and turns because the bracket had broken.. could this cause any problems? The map sensor is still in the hole and still seems to seal well.
01-18-2005, 07:48 PM
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Originally Posted by ss rally red
A quick way too check for a vacuum leak is to use carb/choke cleaner and spray at any possible areas where a leak can occur, when you spray at the leak the idle will change dramaticly.
Friday my auto meter oil pressure gauge gets here.. I will be installing that, along with new coolant temp sensor, pulling the intake for the op gauge and checking for any leaks in the PCV lines and other areas of the car. Resetting PCM also.
01-18-2005, 08:17 PM
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seems to me you have it all figured out. ive heard a half a dozen people say it was a vacume leak and you continue to ignore them. so why do you continue to ask whats wrong if your not going to listen???
01-18-2005, 08:19 PM
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Originally Posted by cgworth
seems to me you have it all figured out. ive heard a half a dozen people say it was a vacume leak and you continue to ignore them. so why do you continue to ask whats wrong if your not going to listen???
01-18-2005, 08:53 PM
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Originally Posted by cgworth
seems to me you have it all figured out. ive heard a half a dozen people say it was a vacume leak and you continue to ignore them. so why do you continue to ask whats wrong if your not going to listen???
01-18-2005, 10:30 PM
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Originally Posted by cgworth
seems to me you have it all figured out. ive heard a half a dozen people say it was a vacume leak and you continue to ignore them. so why do you continue to ask whats wrong if your not going to listen???
I've read to many other things either on other boards and such to tell me otherwise. Plus I have double checked almost everything aroun the intake and hoses.. and all checks up well. For the car to rev that high it'd have to have a ******* hole in the intake. Plus I know the coolant temp sensor is broken off, and that is KNOWN to cause idle problems.. how severe I don't know. I guess we will find out this friday.
01-19-2005, 06:57 AM
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