motor likes to jump or miss at 1500 to 2000rpm, WHY!!!???? - Page 4 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 09-01-2004, 10:58 PM   #31
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Is that why they call them Tr55 bec of the gap of 0.55? I'll pull them this weekend and regap . How was I supp to know to goto the different gap? Also would the only performance issue be the possibility of a miss because of the wrong gap? Do I just clean w a wire brush?
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Old 09-01-2004, 11:14 PM   #32
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Soft wire (steel brush). Inspect your plugs first and see if there'* a miss. TR55 doesn't have any connection to the plug gap. It'* just a part number (for instance, the TR6 is supposed to gap at .045).

Any time you run a plug of a non-standard heatrange, check to see what the gap should be. I called NGK. That'* where the sticky post in Performance came from

I didn't know either.
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Old 09-01-2004, 11:20 PM   #33
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I already know if I pull them I 'm gonna regap and clean. But how do tell by lookin at a plug if there'* a miss?
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Old 09-01-2004, 11:22 PM   #34
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You need to inspect the plugs for fouling or misfiring. Do you have a service manual?
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Old 09-01-2004, 11:36 PM   #35
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yes i do
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Old 09-02-2004, 12:17 AM   #36
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Kewl. There should be a guide in it for 'reading plugs', to determine if there'* something wrong. Remember which cylinder each came from. I lay them out on my maxifuse relay center in order. First thing is that they should all look the same.....that'* the first thing to look for. From there, just follow the guide in your book.

Plugs can tell the story for alot of issues.
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Old 09-02-2004, 11:37 PM   #37
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OK. B4 I left for work this morning I decided to pull the plugs that would only take a few minutes. So i pulled 3 up front and 1 in the rear on driver side. These things were gapped at like 0.065. I cleaned them and gapped them down to 0.055. I have not had any misses today. Could this have been causing a miss? I was gonna regap the other 2 tomorrow and then I decided to go to NAPA at lunchtime today and order 6 new ones just because I feel like they may be damaged now. They were misgapped for probably about 20,000 miles. It could just be me but the car sounded and felt smoother. Can I damage my plugs from a bad gap?
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Old 09-02-2004, 11:43 PM   #38
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Yup. You were 10 thousands off if those were TR55'*. You probably had intermittent misfiring on all 6.

Could be all your problem, might be only part of it. Sounds like you're on the right track.
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Old 09-03-2004, 12:48 AM   #39
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So tomorrowI do plugs and my Gatorbacks should be in. I midas well do an engine clean while I'm at it. Foam or simple green?
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Old 09-03-2004, 11:33 PM   #40
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plugs are changed. I feel no more heitation. I also cleaned engine looks great. I still get a c/e light but it seems now like it'* sooner into driving rather than later like b4. Maybe I got something wet while cleaning engine. I covered alt, o2, various sensor plugs w aluminum foil and i didn't hose the engine. Oh yeah and I put on my Gatorback belts. The yellow logo matches my Lemon- Lime Bonnie color scheme. I gotta post some pics soon as I figure out how!
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