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Old 05-29-2009, 04:51 PM   #1
LvnInPeace
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1992 SC2
Default Misfire between 2 and 3k.....

I can't not seem to figure out what the problem is...It only does it between 2 and 3k rpms...it runs smooth below that and if it is missinb above that I can't hear it....Any ideas on where to start?? Start with plugs? The ECTS is the newer style as well.... was replaced about 3500 miles ago... Thanks guys
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Old 05-29-2009, 05:49 PM   #2
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1998 SC2
Default Re: Misfire between 2 and 3k.....

A misfire in the upper 2K and low 3K range is usually the plugs and/or wires. What brand and number plugs are you using?

How old are the wires and how many times have they been disconnected from the plugs?
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Old 05-29-2009, 06:10 PM   #3
LvnInPeace
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1992 SC2
Default Re: Misfire between 2 and 3k.....

not really sure on the brand....the wires are brand new...pulled off maybe 5-6 times ish..... when I was trying to solve the starting issue I had... what brand should I get to try? the NGK Coppers? any specific part number or anything to ask for? I'll be going to O'Reily...
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1992 SC2 5-Speed
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Old 05-29-2009, 06:40 PM   #4
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1998 SC2
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Default Re: Misfire between 2 and 3k.....

Bkr5esa-11
NGK
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Old 05-29-2009, 07:13 PM   #5
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1998 SC2
Default Re: Misfire between 2 and 3k.....

+1^^^And nothing else. You might have to do some shopping.
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Old 05-29-2009, 07:39 PM   #6
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Default Re: Misfire between 2 and 3k.....

i had this problem and cleaning the back of the icm and spot on where it mounts to the transmission and some ngk's and it went away
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Old 05-29-2009, 09:28 PM   #7
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Default Re: Misfire between 2 and 3k.....

Quote:
Originally Posted by LvnInPeace View Post
not really sure on the brand....the wires are brand new...pulled off maybe 5-6 times ish..... when I was trying to solve the starting issue I had... what brand should I get to try? the NGK Coppers? any specific part number or anything to ask for? I'll be going to O'Reily...
Bad wire order. Its 4-1-2-3 at the coil towers. If you put the wires on in any other order including 1-4-2-3 or 4-1-3-2 you get a similar symptom. This is even more likely since you replaced the wires recently and perhaps put them back on in correctly. Cylinder 1 is the passenger side.
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Old 05-30-2009, 02:57 PM   #8
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Default Re: Misfire between 2 and 3k.....

Found them online at Jegs.com for 2.69 each..good deal or should I continue to shop around?
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Old 05-30-2009, 05:34 PM   #9
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1998 SC2
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Default Re: Misfire between 2 and 3k.....

I think I pick mine up at like Murrays (now O'Reilys) for like 2.40 a pop or something. The only real way to mess up firing order is if you mess it up on the towers. Cause the wires are lengths, so you can't mess up that part.
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Old 05-30-2009, 06:16 PM   #10
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Default Re: Misfire between 2 and 3k.....

I picked up 4 NGK BKR5ES-11 spark plugs at Murray's today. Is there a difference between these and the BKR5ESA-11?
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Old 05-30-2009, 07:23 PM   #11
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1998 SC2
Default Re: Misfire between 2 and 3k.....

Yes. The "A" is a slightly extended nose, helps with idle RPM firing.

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Old 06-03-2009, 10:00 AM   #12
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Idea Re: Misfire between 2 and 3k.....

I've been chasing the same problem on my 1996 sl2. After reading all the posts i still couldn't fix it. My sensors were all working, firing order was correct. Plugs, wires, and coils were working, all sensor/wire connections were good. The one thing that solved it was a fuel pump. Check your fuel pump pressure, replace the fuel filter. On my car, the pressure was great at an idle, OK at a high idle, but dropped to nothing under a load. I don't know why, but two days ago, my car died and I had to replace the fuel pump. A tear came to my eye when i took the car for a ride down the road and the misfiring stopped, and I actually had power! Check the fuel system!!

by the way- Thank you Oldnuc for your continued help and guidance to all of us Saturn owners.
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Old 06-03-2009, 10:12 AM   #13
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1998 SC2
Default Re: Misfire between 2 and 3k.....

Good tip! Usually a weak fuel pump also shows up as a slightly low Idle fuel pressure. Doing a pressure - flow test on the fuel pump is not a normal DFIY job as it requires a set of adapters and a means for measuring both pressure and flow at the same time. The pump should supply 45 - 55 gph @ 65psi, that is 96 - 117oz/min @ 65psi min.
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