pose_Z34 Posted January 14, 2008 Report Posted January 14, 2008 Hey y'all. I just picked up a 1992 Z34 5 speed and it has a problem with it idling high when it's first started (around 2000-2500 rpm). The Service engine light is on when it revs high as well, but goes off when the rpm's go down. I have a buddy who says that it could be the idle air unit. I thought it might be that or the pressure switch. Should I change both to be sure? Thanks in advance. Pose Quote
jeremy Posted January 14, 2008 Report Posted January 14, 2008 did you find out what the code is for? Quote
rockfangd Posted January 14, 2008 Report Posted January 14, 2008 could also be a coolant temp sensor out of range. That will cause the same type of symptoms Quote
pose_Z34 Posted January 14, 2008 Author Report Posted January 14, 2008 Just wasn't sure if it was 1thing or several possibilities. Looks like I'll need to run to autozone. They'll scan it for free for me. Quote
jeremy Posted January 14, 2008 Report Posted January 14, 2008 Just wasn't sure if it was 1thing or several possibilities. Looks like I'll need to run to autozone. They'll scan it for free for me. autozone will scan OBDII, yours is too old and is OBDI....use a paperclip.... Quote
Robby1870 Posted January 14, 2008 Report Posted January 14, 2008 http://www.w-body.com/forum/index.php?topic=31177.0 Quote
Q-Ball Posted January 14, 2008 Report Posted January 14, 2008 I wanted to do this, but where do you look for these "flashes"? Quote
ManicMechanic Posted January 14, 2008 Report Posted January 14, 2008 The Check Engine light will flash. Quote
Q-Ball Posted January 14, 2008 Report Posted January 14, 2008 The Check Engine light will flash. Oh thanks, and then you just count how many times it flashes to find the code? Quote
Andrew Posted January 15, 2008 Report Posted January 15, 2008 the high idle is very likely to be the LIM gaskets as well. Quote
pose_Z34 Posted January 16, 2008 Author Report Posted January 16, 2008 I checked the codes and all I get is 12, nothing else. Plus it's not idling high any more. Guess I'll just have to be ready when it does again. Quote
GutlessSupreme Posted January 16, 2008 Report Posted January 16, 2008 the high idle is very likely to be the LIM gaskets as well. x2 you'll notice this a lot more when it's colder out. The gasket leaks while it's cold and brittle, until it warms up and seals better. Quote
pose_Z34 Posted January 16, 2008 Author Report Posted January 16, 2008 It's about 15 degrees here and it did fine. Quote
ManicMechanic Posted January 16, 2008 Report Posted January 16, 2008 The Check Engine light will flash. Oh thanks, and then you just count how many times it flashes to find the code? That's correct. Quote
oceancon Posted February 25, 2008 Report Posted February 25, 2008 the high idle is very likely to be the LIM gaskets as well. What are LIM gaskets? thanks Quote
Psych0matt Posted February 25, 2008 Report Posted February 25, 2008 the high idle is very likely to be the LIM gaskets as well. What are LIM gaskets? thanks Lower intake manifold Quote
pose_Z34 Posted February 26, 2008 Author Report Posted February 26, 2008 Anyway, found the problem. Replaced the Idle/Air Control and it's now great!! Quote
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