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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / September 2006Car shaking after changing spark plugs
Hi, Today I replaced the six spark plugs of my 94 Ford Taurus. However, when I stop for red lights, the car shakes every one or two seconds. Does anybody know the reason? Could it be that I didn't adjust the gap? Thanks, Wei One wire is not plugged in properly or the wires are in the wrong order or you cracked a plug during the installation. > Hi, > [quoted text clipped - 6 lines] > Thanks, > Wei > Hi, > [quoted text clipped - 6 lines] > Thanks, > Wei Add to what Shep said: Possibly destroyed a wire or several while changing plugs. «» wrote: > > Hi, > > [quoted text clipped - 9 lines] > Add to what Shep said: > Possibly destroyed a wire or several while changing plugs. I replaced my wire because I came into a new set for free, an that problem of yours I had for years went away. >Hi, > [quoted text clipped - 3 lines] >Does anybody know the reason? >Could it be that I didn't adjust the gap? Your car will miss at idle if the spark plug gaps are too close. Also, if you put in Bosch take them out. Don www.donsautomotive.com >Thanks, >Wei Wei Hu Wrote: > Hi, > [quoted text clipped - 6 lines] > Thanks, > Wei I'll cocurr with the others...cracked insulator or damaged plug wire most likely, gap not so much so, but possible...if they were platinum plugs with the preset gap, they are rarely ever wrong...the electrode is tough as hell and doesn't bend easily.. I agree also, Bosch Plats are crap, I'd throw them away if that's what you got, get Motorcraft or Autolite for it...  Signaturejeffcoslacker http://www.automotiveforums.com jeffcoslacker <jeffcoslacker.2d6x4t@no-mx.nodomain.com> wrote in article > I'll cocurr with the others...cracked insulator or damaged plug wire > most likely, gap not so much so, but possible...if they were platinum [quoted text clipped - 3 lines] > I agree also, Bosch Plats are crap, I'd throw them away if that's what > you got, get Motorcraft or Autolite for it... I, for one, would be interested in hearing what, exactly, is "crap" about the Bosch plugs. Resistors? Metallurgy? Ceramic composition? Where do they fail in your testing? What type of testing did you subject them to? What is it, exactly, that makes them inferior to other spark plugs? Plat Bosch's in a 97 Lumina 3.1, replaced OE plats at 70k, at 22k Bosch's began misfire under load, pulled em out the center electrode had eroded below the insulator, put oe's in another 70k no problem, field test seemed to indicate they wouldn't work in this car. > jeffcoslacker <jeffcoslacker.2d6x4t@no-mx.nodomain.com> wrote in article >> [quoted text clipped - 16 lines] > > What is it, exactly, that makes them inferior to other spark plugs? Shep <djsljsrn@capital.net> wrote in article <1156687014_14755@sp6iad.superfeed.net>... > Plat Bosch's in a 97 Lumina 3.1, replaced OE plats at 70k, at 22k Bosch's > began misfire under load, pulled em out the center electrode had eroded > below the insulator, put oe's in another 70k no problem, field test seemed > to indicate they wouldn't work in this car. So, you're absolutely sure that it was the plug - not the ignition system's inability to deal with the resistance of the Bosch Platinum plug??? >Shep <djsljsrn@capital.net> wrote in article ><1156687014_14755@sp6iad.superfeed.net>... [quoted text clipped - 7 lines] >So, you're absolutely sure that it was the plug - not the ignition system's >inability to deal with the resistance of the Bosch Platinum plug??? I have never used the Platinums, but I have been using the usual $2 Bosch plugs for thirty years and never had a problem. They're a little more expensive than Autolite or NGK but they seem reliable. --scott Signature"C'est un Nagra. C'est suisse, et tres, tres precis." Scott Dorsey Wrote: > >Shep <djsljsrn@capital.net> wrote in article > ><1156687014_14755@sp6iad.superfeed.net>... [quoted text clipped - 17 lines] > -- > "C'est un Nagra. C'est suisse, et tres, tres precis." It's the plats we're harping on...I have no issue with Bosch standard plugs. Signaturejeffcoslacker http://www.automotiveforums.com > jeffcoslacker <jeffcoslacker.2d6x4t@no-mx.nodomain.com> wrote in article > > [quoted text clipped - 16 lines] > > What is it, exactly, that makes them inferior to other spark plugs? Don't know what is wrong with the suckers, but if you put them in a Jeep 4.2 carb engine and in most Jeep 4.0 FI engines, they will work for a few miles, then they carbon up and the engine starts running like crap, especially at idle. Pull them out, put some real plugs in like Champion and bingo, the engine runs well again. I have seen this well over a half dozen times in the last few years and the fix is always to toss the plugs out. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pictures.html?id=2115147590 (More Off Road album links at bottom of the view page) Mike Romain Wrote: > > jeffcoslacker <jeffcoslacker.2d6x4t@no-mx.nodomain.com> wrote in > article [quoted text clipped - 39 lines] > Jan/06 http://www.imagestation.com/album/pictures.html?id=2115147590 > (More Off Road album links at bottom of the view page) It's called empirical data, or experience.... I'm seeing replies here similar to my experiences with Bosch plats....fouling, unstable idle, short life, etc. Same thing I've noticed in my own cars when I tried them, as well as customer's car (who insisted that I install them, against my advice, and nearly always came back within a month or two wanting them replaced for the reasons listed above...) Signaturejeffcoslacker http://www.automotiveforums.com Mike Romain <romainm@sympatico.ca> wrote in article <44F1AFD5.FEE5B981@sympatico.ca>... > Don't know what is wrong with the suckers, but if you put them in a Jeep > 4.2 carb engine and in most Jeep 4.0 FI engines, they will work for a [quoted text clipped - 4 lines] > I have seen this well over a half dozen times in the last few years and > the fix is always to toss the plugs out. These were the actual plugs recommended for the application by Bosch in the Bosch catalog? Or were the plug applications determined by cross-referencing from one plug manufacturer to Bosch? Carboned-up plugs suggest two things to me...... Bad fuel system - which I would feel safe in eliminating since it would appear that other plugs did not carbon up in the same application. OR - wrong heat range for the plug....plugs running too cold for the engine application. Carboning up on a single plug MIGHT suggest one bad plug...... .....but carboning up on ALL plugs suggests fuel system or parts application problems. > Mike Romain <romainm@sympatico.ca> wrote in article > <44F1AFD5.FEE5B981@sympatico.ca>... [quoted text clipped - 26 lines] > .....but carboning up on ALL plugs suggests fuel system or parts > application problems. These plugs came out of the bosch book for the applications. I mentioned two types of fuel systems and two types of ignition systems with totally different coils. The same complaint is posted a fair bit in the Jeep newsgroups. It is common. Those engines just don't like those plugs or Bosch has no clue in their North American books what plug a Jeep engine needs..... Note all the others saying the same thing with other makes of engines. Maybe Bosch has a defect they aren't aware of? Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pictures.html?id=2115147590 (More Off Road album links at bottom of the view page) Mike Romain Wrote: > > Mike Romain <romainm@sympatico.ca> wrote in article > > <44F1AFD5.FEE5B981@sympatico.ca>... [quoted text clipped - 55 lines] > Jan/06 http://www.imagestation.com/album/pictures.html?id=2115147590 > (More Off Road album links at bottom of the view page) I don't know...but the symptoms point to a very anemic, thin spark production...not the fat flamethrowers that American high energy ignition systems seem to like....after many issues with plugs in different makes and models, I now always go with what is OEM, AC/Delco in GM, Autolite or Motorcraft in Fords, Champion in Chrysler products, Denso or NGK in Jap makes, Bosch in the Europeans that call for them...saves a lotta hassle.. Some plugs are a proven winner for any app, i.e. I've put NGK's and Denso's in just about anything at one point or another, with no ill results.... Signaturejeffcoslacker http://www.automotiveforums.com Mike Romain <romainm@sympatico.ca> wrote in article <44F30B6B.C842C50@sympatico.ca>... > > Mike Romain <romainm@sympatico.ca> wrote in article > > <44F1AFD5.FEE5B981@sympatico.ca>... [quoted text clipped - 39 lines] > > Maybe Bosch has a defect they aren't aware of? Actually, my questions were leading up to the possibility of an incorrect application listed in the catalog. Black deposits on all plugs usually indicate a fuel system that is too rich or a plug that is too cold. > Mike Romain <romainm@sympatico.ca> wrote in article > <44F30B6B.C842C50@sympatico.ca>... [quoted text clipped - 55 lines] > Black deposits on all plugs usually indicate a fuel system that is too rich > or a plug that is too cold. It happens really fast on some of them and it has been going on for a few years, since they came out I believe. The book could just plain be wrong for a bunch or the systems are designed for a fat spark like someone mentioned and they have a sharp thin spark. Meanwhile I get great results with Champion plugs in my CJ7's case gapped a bit big to match an Accel SuperCoil's hotter output. I am happy. Get good emissions and good mileage with punch when I need it. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pictures.html?id=2115147590 (More Off Road album links at bottom of the view page) > jeffcoslacker <jeffcoslacker.2d6x4t@no-mx.nodomain.com> wrote in article > [quoted text clipped - 16 lines] > > What is it, exactly, that makes them inferior to other spark plugs? I would guess in this case it's heat range. Heat range X isn't always the same across brands, and some cars are really sensitive about this. My buddy has a PT Cruiser that had the check engine light come on when it was a year old and there was a TSB on the plugs. Can't remember which brand was involved, but basically the TSB was "thou shalt ONLY use plug xyz in this engine or your Check Engine light will be on." I've bought used cars with 3 different brands of plugs without any issues, but some cars are just "picky" about the plugs. Ray >jeffcoslacker <jeffcoslacker.2d6x4t@no-mx.nodomain.com> wrote in article >> [quoted text clipped - 16 lines] > >What is it, exactly, that makes them inferior to other spark plugs? I don't know what wrong with them but I DO know that they will cause a misfire that can be fixed by doing absolutely nothing other than putting NGK or Denso plugs in the car. I have heard many reports of this and was sceptical until experiencing it myself a few times. Don www.donsautomotive.com > jeffcoslacker <jeffcoslacker.2d6x4t@no-mx.nodomain.com> wrote in article >> [quoted text clipped - 16 lines] > > What is it, exactly, that makes them inferior to other spark plugs? How about personal experience. Customer brings vehicle in complaining about poor idle, miss under load, hard starting, poor mileage, etc..... Customer states vehicle had tune-up anywere from one week to six months ago. Tune-up looks good except Bosh plugs were used. Replace Bosh plugs with quality plugs and driveability problems are gone. I have seen this happen dozens of times. Bosh plugs are JUNK!!!! >> jeffcoslacker <jeffcoslacker.2d6x4t@no-mx.nodomain.com> wrote in article >>> [quoted text clipped - 23 lines] >quality plugs and driveability problems are gone. I have seen this happen >dozens of times. Bosh plugs are JUNK!!!! That's exactly right! WHY they don't work I don't know. Don www.donsautomotive.com WOW, AM i glad i read this post this morning. I just installed Bosch platinum plugs in my 1995 Buick Century 3.1 a week ago, and it is at idle, doing a little "sputtering".. It is drivable (other than my new problem of power steering fluid leaking on the drivers side underneath coming out pretty good...........not sure yet what it is...havent had it checked out...i mean the reservoir and pump and main hoses are on the passenger side, and now the leak drippings are coming down on the DRIVERS side...? When i can i am going to buy some other plugs. But i am getting about a half quart to about 10 miles of powersteering fluid right now! > I agree also, Bosch Plats are crap, I'd throw them away if that's what > you got, get Motorcraft or Autolite for it... I got Autolite, the basic ones, less than two dollars for each. http://tinyurl.com/ftavm Check the order of the wires off the distributor to the plugs. Then, as most have said, if firing order okay, you likely looking at a bad wire, bad connect at either the dist. or the plug. SignatureKnifeblade_03 http://www.automotiveforums.com > Hi, > [quoted text clipped - 6 lines] > Thanks, > Wei Have a look inside the spark plug wire connectors, especially the elbow ones. Make sure you haven't pulled the metal connector back into the rubber shield when you pulled the connectors off. I had that happen to my Pontiac. An easy way to check is to press your thumb on the top of the connector when it's still attached and see if you feel the top of the spark plug. Check the distributor connections for the same thing. Wei Hu Wrote: > Hi, > [quoted text clipped - 6 lines] > Thanks, > Wei Hi Wei According to NGK, you can use the following: 1994 FORD TAURUS LX / V6 / 3.0 SPARK PLUGS Spark PlugPart No.Stock No.Plug GapNote G-Power Platinum TR5GP 3186 0.044 Laser PTR5F-11 6579 0.044 Iridium IX TR5IX 7397 0.044 WIRE SETS NotePart No.Stock No.OHV Eng. RC-FDZ030 52164 OXYGEN SENSORS Pre-Cat Left 22500 Pre-Cat Right 22500 Post-Cat Left N/R Post-Cat Right N/R Signatureclubplug http://www.automotiveforums.com COULD BE: a plug wire could be on wrong cylinder (fire order off), you have a small vacuum leak (perhaps this happened during the plug change); others. Hank >Wei Hu Wrote: >> Hi, [quoted text clipped - 29 lines] >Post-Cat Left N/R >Post-Cat Right N/R |
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