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

High rpm crap out

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Old Oct 15, 2003 | 06:37 PM
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cz28s's Avatar
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High rpm crap out

OK! ladies and gentleman the problem has been solved! I just went ahead rebuilt my motor! I put in a 383 Stroker and replaced the clutch and the OPTI and it runs just fine now! a rebuild cures all haha. now it seems im running too lean, dangit

Ok lets say when i romp on it it runs through the powerband fine and strong until it gets to high rpm s lets say about 4800 and beyond it just kinda stops picking up power and i noticed a stutter/ hesistation too. im still learning bout these cars or else i wouldnt be asking you fellas. also what can throw your tachometer off? Thanks Cory

Last edited by cz28s; Feb 3, 2005 at 07:13 PM.
Old Oct 15, 2003 | 07:49 PM
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ttt
Old Oct 15, 2003 | 08:04 PM
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It could be your fuel filter, coil, or fuel pump...
Old Oct 15, 2003 | 09:16 PM
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what kind of fuel filter do you guys recommend. hopefully its the cheap way out but it never is, any other ideas
Old Oct 15, 2003 | 09:49 PM
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Get an aftermarket coil (MSD, Accel, etc.) The coils in the pre-96 cars arent all that great and will cause some misfires high in the rpm range. This was happening to my 95 as well and when I went with the MSD coil this problem went away.
Old Oct 15, 2003 | 10:02 PM
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really iwant nothing but the best parts for the car, afterall you gotta pay to play. So you say MSD coil all the way huh. Prices ? what type of fuel filter as well ill throw that in too
Old Oct 15, 2003 | 10:30 PM
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Yeah, my MSD coil does the trick. Just get a cheapo fuel filter from AutoZone or your local parts store, it'll work just fine. You should also replace the coil wire while you're at it. See if your hesitation goes away with just the coil, if it doesn't, replace the wire. Coil wires are a very common cause of high-rpm misses.
Old Oct 19, 2003 | 08:00 PM
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Also this problem seems to be intermittent, I romped on it today and the car ran all the way through the powerband with no prob what so ever, but yesterday it took a bad dump on me high up in the rpm range again. I hope this can narrow the problem. If you guys could use any more info just let me know and ill post. Thanks a million Cory
Old Oct 19, 2003 | 08:32 PM
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How old are your plugs and wires?
Old Oct 19, 2003 | 08:35 PM
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i bought the car about a month ago and the fella i bought it from, said he changed the plugs and wires not too long ago (not sure when) but i asked what he used and he didnt know, just the cheapest ones he could find. You cant do that with these cars can you?
Old Oct 19, 2003 | 09:12 PM
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Originally posted by cz28s
but i asked what he used and he didnt know, just the cheapest ones he could find
Get some NGK tr-55's. They are a lil over a buck a piece and the best you can get. Be wary of buying a car from someone who states they bought the cheapest they could find.

-Shannon
Old Oct 19, 2003 | 09:17 PM
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NGK-TR55s are pretty good N/A plugs

I would also check to make sure that ur trans isn't slipping. Also, there is a possibility that u have a clogged cat as well.
Old Oct 19, 2003 | 09:53 PM
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the cats not clogged I had a muffler shop torch a hole in it and look we saw nothing except that half the guts inside the cat have blown away, so real it s a half gutted cat, I really dont fell as if its the tranny doesnt fell tranny related at all to me more like a miss of some sort. so these NGK tr55 's are good for the car i dont mind paying the extra buck for something that is better. Thanks again for your help. Cory
Old Oct 19, 2003 | 10:20 PM
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I had a very similar problem, was the plugs...my number 8 plug was pretty damn bad.
Old Oct 20, 2003 | 12:39 PM
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what are the best plugs to get. and wires! gonna do the full job



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