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03-30-2004, 11:54 PM
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#1 |
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Registered User
Join Date: Mar 2003
Location: Alberta, Canada
Posts: 205
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I need some help guys...
On my engine, the #7 cylinder doesnt seem to be firing. There is spark and compression(about 110) but the header tube doesnt get hot, and it runs the same with or without the plug cap installed. I tried a new plug and a new wire and nothing. I wanna get her running nice for spring, but not to sure where to start.
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-90 454ss http://www.imagestation.com/album/?id=4289115843 -04 TRX450R -77 c-10 http://www.imagestation.com/album/?id=4290506213 SOLD -82 c-10 SOLD -02 CRF450 SOLD |
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03-31-2004, 01:15 AM
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#2 |
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LED King
Join Date: Jan 2003
Location: Sacramento, CA
Posts: 2,087
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How about a new cap?
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Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32 |
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03-31-2004, 02:12 AM
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#3 |
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Registered User
Join Date: Jun 2003
Location: Fort McMurray, Alberta, Canada
Posts: 513
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Kybol you have a PM
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Ben 1983 Silverado SWB 305 2002 Silverado Extended Cab 5.3 http://members.shaw.ca/bkennett |
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04-01-2004, 01:07 AM
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#4 |
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Registered User
Join Date: Feb 2004
Location: Hodgenville, Ky
Posts: 735
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Check for vacumme leaks on the intake. Also, many set ups use a vacumme "T" near cylinder #7, so a bad hose there (tranny vacumme modulator, vac ball, etc) will cause a misfire like you describe.
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04-01-2004, 11:31 AM
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#5 |
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Registered User
Join Date: Jul 2001
Location: Atlanta GA
Posts: 1,704
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Pull the valve cover and verify the valves are opening. A bust rocker or flat cam lobe could give a OK compression reading but not alow any fuel charge in the cylinder or a spent load to exhast so no boom even thought it has compression.
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Grim-Reaper 70 Pontiac LeMans Sport Convertible, worlds longest resto in progress Looking for 71-72 2wd Blazer or Jimmy Project |
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04-01-2004, 12:27 PM
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#6 |
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Registered User
Join Date: Feb 2003
Location: Mont Belvieu, TX
Posts: 852
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They make a test light that you put in your plug wire. It will tell you if you are getting fire, then you can go from there.
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Chris '92 ext. cab s/b 4.3L "Sparky" '04 crew cab 2500 4x4 6.0L |
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04-01-2004, 01:43 PM
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#7 | |
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Registered User
Join Date: Jul 2001
Location: Atlanta GA
Posts: 1,704
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Quote:
 You can do this with a spark plug. Just play the plug on some metal so it's has a path to ground. Crank and watch for spark at the tip.
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Grim-Reaper 70 Pontiac LeMans Sport Convertible, worlds longest resto in progress Looking for 71-72 2wd Blazer or Jimmy Project |
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04-01-2004, 01:53 PM
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#8 |
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Registered User
Join Date: Feb 2003
Location: Mont Belvieu, TX
Posts: 852
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I was just trying to be on the safe side. My Dad would always use me as the tester on our lawn mowers. He would say, "here hold this while I pull this cord"
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Chris '92 ext. cab s/b 4.3L "Sparky" '04 crew cab 2500 4x4 6.0L |
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