bodes1320 Posted May 13, 2005 Report Share Posted May 13, 2005 when i start my car it goes right to 3500 rpm's, could it be the iac? Quote Link to comment Share on other sites More sharing options...
topless94style Posted May 13, 2005 Report Share Posted May 13, 2005 could be a vac leak. need more info to help you better. Quote Link to comment Share on other sites More sharing options...
NY GTP Posted May 13, 2005 Report Share Posted May 13, 2005 This is his son, Rich. My dads a bit of a noob at this web forum stuff I think, so excuse his lack of detail hehe. The car is a 1993 Cutlass International with the 3.4 DOHC. Forgot the mileage, but I think it might have around 50-60k, not sure. The other day it developed a high idle that would stay until the car warmed up, when it would drop down to normal. I believe he told me the SES light is on, but due to his work schedule I dont think he has had the time to check the code yet. Should be able to get around to that today though after I get home from work. I'm thinking his IAC could possibly be stuck open, acting like a stuck choke that wont let the idle down. Hes thinking maybe his TPS could be reading wrong, but due to the fact the idle settles down after warm up I cant see that being the culprit. Anyone else have any ideas for us to check out? Quote Link to comment Share on other sites More sharing options...
topless94style Posted May 13, 2005 Report Share Posted May 13, 2005 Easy fix, for someone who can handle tools without a problem. Common problem with these engines, lower intake manifold gasket. It leaks at start up, because the metal is cold, and then as the engine heats up and warms, the metal expands just enough to seal the leak. Usually its just a vac leak, sometimes it can be more. Start with checking the sensors, but more than likely it is the gasket. Quote Link to comment Share on other sites More sharing options...
Stevo Posted May 13, 2005 Report Share Posted May 13, 2005 Lower intake gasket is shot and needs to be replaced. Â When it heats up it expands to fill the gaps. What happens is the car is sucking air and hitting the rev limiter. While your down there I suggest replacing the oil pump drive seal because that can save you 5+ hours of labour down the road like what I should have done. Quote Link to comment Share on other sites More sharing options...
sonyman87 Posted May 13, 2005 Report Share Posted May 13, 2005 As oppose to just telling you that the intake gaskets are shot. there is a step by step writeup how to do it with pictures  http://www.60degreev6.com/modules.php?op=modload&name=DOHC&file=index&req=viewarticle&artid=16&page=1  http://www.60degreev6.com/modules.php?op=modload&name=DOHC&file=index&req=viewarticle&artid=17&page=1 Quote Link to comment Share on other sites More sharing options...
NY GTP Posted May 14, 2005 Report Share Posted May 14, 2005 Thanks guys. The car is going in tomorrow morning to a local dealer where a friend of ours works, and hes going to scan it and see if he can find the problem. Hes thinking maybe the EGR valve is the culprit, we'll see. Quote Link to comment Share on other sites More sharing options...
sonyman87 Posted May 14, 2005 Report Share Posted May 14, 2005 Thanks guys. The car is going in tomorrow morning to a local dealer where a friend of ours works, and hes going to scan it and see if he can find the problem. Hes thinking maybe the EGR valve is the culprit, we'll see. Â i hope you have DEEP pockets. i cant remember the last time i went to a dealership and spent less then $600 for ANYTHING. Â btw. the intake gaskets for a dealership to do is ruffly $650. all you need is a $20 gasket set the rest is labor. do it yourself in 3 hours for a first try. but you can do it yourself with the right tools in under 45mins. Â EGR simple place 3 bolts a simple wire harness and its out. Quote Link to comment Share on other sites More sharing options...
maybe2fast Posted May 14, 2005 Report Share Posted May 14, 2005 how would a EGR cause a high idle? I think it is the Lower Intake Gasket Quote Link to comment Share on other sites More sharing options...
sonyman87 Posted May 14, 2005 Report Share Posted May 14, 2005 how would a EGR cause a high idle? I think it is the Lower Intake Gasket  Agreed!! 100%  the leaky intakes will cause your 02 sensor to screw up. your egr to screw up, MAF, and verious sensors to give bad readings.  its like my fuel pump problem. My fuel preasure got low and it threw codes. MAF sensor, O2sensor were going nuts. but it was the low fuel preasure causing all the trouble. Not once did a mechanic say fuel pump. I found that out on my own from testing the actual fuel preasure.  computers are dumb and contain only eyeline logic which is genaric at best. Quote Link to comment Share on other sites More sharing options...
NY GTP Posted May 14, 2005 Report Share Posted May 14, 2005 Well its a friend that works at a dealership so hes going to do it all for either free or charge my dad maybe 50 bucks at the most to scan the car. Hes not getting work done, hes just having the car scanned and looked at a little more deeply to see if they can find the problem. Our mechanic friend from the dealer came over yesterday to look at the car in our driveway and used a piece of rubber tubing to try and listen for a vacuum leak around the lower intake gasket and heard nothing. Which is why he doesnt think its that. The fact that it was replaced last year with a brand new gasket is another reason he doesnt think its that. how would a EGR cause a high idle? I think it is the Lower Intake Gasket If the EGR gets stuck open at startup, its providing another source of unmetered air for the motor to suck in, basically acting like a vacuum leak. Remember, the EGR isnt supposed to open until operating temp is reached. Quote Link to comment Share on other sites More sharing options...
Andrew Posted May 17, 2005 Report Share Posted May 17, 2005 Well its a friend that works at a dealership so hes going to do it all for either free or charge my dad maybe 50 bucks at the most to scan the car. Hes not getting work done, hes just having the car scanned and looked at a little more deeply to see if they can find the problem. Our mechanic friend from the dealer came over yesterday to look at the car in our driveway and used a piece of rubber tubing to try and listen for a vacuum leak around the lower intake gasket and heard nothing. Which is why he doesnt think its that. The fact that it was replaced last year with a brand new gasket is another reason he doesnt think its that.how would a EGR cause a high idle? I think it is the Lower Intake Gasket If the EGR gets stuck open at startup, its providing another source of unmetered air for the motor to suck in, basically acting like a vacuum leak. Remember, the EGR isnt supposed to open until operating temp is reached. Â he was only able to listen to the front lower intake gasket. so he didnt do a full diagnosis on the possibility of the lower intake leak. i believe this to be the prob as well. a new EGR is $300. if for some reason you believe it is the culprit, try cleaning yours out first. i know someone made step by step instructions on how to do this a long time ago. oh yeah, if you are throwin code 32 (egr code) dont be surprised that by changing it out or rebuilding it doesnt stop the code from coming up. the unit itself doesnt always make that code go, i learned this the hard way, $300 later... though i never did figure that prob out on my ole z. :oops: i would listen to the masses here bud. i think almost everyone here who has owned/owns a 3.4 has done the lower intake gaskets at least once. Quote Link to comment Share on other sites More sharing options...
Brian P Posted May 17, 2005 Report Share Posted May 17, 2005 yes the EGR stuck open can create a form of "vacuum leak" but within a short amount of time the engine is going to run rough and want to stall due to the buildup of exhaust gases. This is exactly what happened with my old engine, and the code I always got was for the IAC. Quote Link to comment Share on other sites More sharing options...
NY GTP Posted May 17, 2005 Report Share Posted May 17, 2005 Well after bringing it up to the dealer it appears that its possibly on of the gaskets between the heads and intake, or it still could be the LIM gasket. Atleast thats what I think he said. Im not sure what hes gonna do about it though. Quote Link to comment Share on other sites More sharing options...
topless94style Posted May 17, 2005 Report Share Posted May 17, 2005 Ya, that would be the problem. Quote Link to comment Share on other sites More sharing options...
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