1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Grey Smoke and can not get to redline

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Old 04-05-04, 12:22 AM
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Grey Smoke and can not get to redline

I tried doing a search but nothing stood out so I will ask anyhow. ! have a 85 GS, and it smokes. A grey smoke but it only does it sometimes, I first noticed it when I got off the highway on day. Like I said it does not happen all the time, sometimes driving, but not at idle. Also I can not get to redline. At about 6000 it will bounce back. I changed the fuel filter but nothing changed. Any help would be greatly appreciated!


J
Old 04-05-04, 01:38 AM
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bounce back? like hitting a rev limiter? no one put an aftermarket ignition on your car did they
Old 04-05-04, 01:54 AM
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how's your mixture? are you running too lean?
Old 04-05-04, 10:11 AM
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bad pump, bad car?b
Old 04-05-04, 10:49 AM
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Change your fuel filter, it is probably clogged causing you to run lean (grey smoke). If that doesn't help then check the output of your fuel pump.

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Old 04-05-04, 11:39 AM
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I changed the filter but that did nothing. it does not have an after market ignition, but it seems it used to. It had a msd sticker still on the inside of the hood.
Old 04-05-04, 11:47 AM
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You sure the msd still isn't on it? The only thing that I can see making it bounce back like that is a rev limiter.
Old 04-05-04, 03:19 PM
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no box, stock coils and wiring. Should I try tapping into the tach wire and try a different tach?
Old 04-05-04, 07:52 PM
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put clean plugs in
Old 04-06-04, 12:36 AM
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Allright, any recommendations on plug, it has Densos on it now, should I run NGK.
Old 04-06-04, 12:39 AM
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yes NGK br8eq-14 stock number 2329 i believe this is the recomended plug
Old 04-06-04, 09:53 AM
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NGK all the way
Old 04-09-04, 10:48 AM
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Originally posted by 198512A
Allright, any recommendations on plug, it has Densos on it now, should I run NGK.
Acutally, Denso's are BETTER than NGK's. Denso is what Mazda uses when they roll off the floor.
Old 04-09-04, 12:32 PM
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Do not run DENSO'S by far that is the worst plug ever to be put on the market. Just a few years ago I had a detonation problem on a nissan z74 engine. I worked on it for two weeks trying to figure out what the problem was.... Just for fun I tried a plug out of my 280z which was in fact NGK, and the problem quit.

NGK ALL THE WAY!!!!!!!!!
Old 04-09-04, 08:17 PM
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it WILL run

 
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Originally posted by Deno_Spimoni
Do not run DENSO'S by far that is the worst plug ever to be put on the market. Just a few years ago I had a detonation problem on a nissan z74 engine. I worked on it for two weeks trying to figure out what the problem was.... Just for fun I tried a plug out of my 280z which was in fact NGK, and the problem quit.

NGK ALL THE WAY!!!!!!!!!
no autolites are worse
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