LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

the car finally runs, slight issue though

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Old Jul 9, 2012 | 02:20 AM
  #1  
96z28_lt1's Avatar
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From: colorado springs, co
the car finally runs, slight issue though

Hey guys i finally got my car running almost right now after 11 months of it being apart and redone. The problem is when driving the cars rpms hang at like 2000 rpm with clutch pressed in and not in gear, when stoping teh rpms don't drop until almost a complete stop, also idle is about 100 rpms i've seen it 300 rpms higher then its suppose to be car was tuned for 825 i believe and its idling around 900ish sometimes even touching 1100 before it drops back down. I tried the IAC from the guide off shbox and it brought the pms down to 900 when before they were 1100ish. Also driving at low speeds(i've only had the car up to 40mph so far) it bucks under little to no throttle sometimes worse then others is this cam surge i'm not quite sure because this is my first cam, or if its related to the other problems. Thanks for the help!
Old Jul 9, 2012 | 03:16 AM
  #2  
my1994z28's Avatar
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From: warren,michigan
Re: the car finally runs, slight issue though

Have you had the car tuned yet?...Every "camed"car I have had they all surged when the rpms were under 2000 rpms....Congrats on geeting your running and on the road..
Old Jul 9, 2012 | 09:44 AM
  #3  
96z28_lt1's Avatar
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From: colorado springs, co
Re: the car finally runs, slight issue though

its got a tune from mad tuner, runs a little rich but i hear thats expected, just trying to figure out why the rpms are hanging at about 2grand when i presss in clutch its kind of annoying, and thanks its great to drive her again.
Old Jul 23, 2012 | 04:42 PM
  #4  
A2GrLT1's Avatar
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From: Ann Arbor, MI
Re: the car finally runs, slight issue though

Have you checked for a vacuum leak?
Old Jul 23, 2012 | 07:32 PM
  #5  
parkers Z28's Avatar
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Joined: Apr 2012
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From: north Carolina
Re: the car finally runs, slight issue though

possible that the throttle cable is sticking or the spring that works it maybe a little
rusty from sitting??? congratulation on you build I'm sure your going to be happy
with it once you get the bugs worked out. i think there is a throttle position sensor
also scan for codes.

Last edited by parkers Z28; Jul 23, 2012 at 07:37 PM.
Old Jul 23, 2012 | 10:08 PM
  #6  
saylorz28's Avatar
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Joined: Jul 2012
Posts: 22
Re: the car finally runs, slight issue though

sounds like an auto pcm on a stick to me ... my 90 z did the same thing until i got a chip burnt for it to swap from auto to stick ... could be a mix up with the tune .. i've seen stranger things
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