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10-15-2009
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#1 |
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Join Date: Jul 2009
Location: Springfield Missouri
Posts: 53
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1 Cyl miss, out of ideas, might sell cheap..LOL
heres the story, have miss on cyl #6,
I have so far changed fuel pumps, fuel filter, new Accel inj, new Borg Warner coils, checked all vacuum lines, new NKG spark plugs, New Oxygen sensors. checked all conectors and set TPS Cly #6 has spark, but a miss, I am getting lean code on pass side. I am open to all ideas, 
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10-15-2009
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#2 |
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Join Date: Jul 2009
Location: Springfield Missouri
Posts: 53
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Re: 1 Cyl miss, out of ideas, might sell cheap..LOL
forgot to add also did a compression test, 180lbs
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10-16-2009
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#3 |
Join Date: Oct 2004
Location: Folsom CA
Posts: 1,645
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Re: 1 Cyl miss, out of ideas, might sell cheap..LOL
ECM.
TomC "Crabs"
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TomC '90ZR1 #792 Honorary Pirate [B]If it ain't FUN, you're doing something terribly WRONG. [/B] |
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10-16-2009
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#4 |
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Join Date: Jul 2009
Location: Springfield Missouri
Posts: 53
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Re: 1 Cyl miss, out of ideas, might sell cheap..LOL
ECM??? is that the one under the plenum? how do I test? replace?
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10-16-2009
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#5 |
 
Join Date: Dec 2003
Location: Chicagoland,IL
Posts: 2,680
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Re: 1 Cyl miss, out of ideas, might sell cheap..LOL
Try the easy thing first and change #6 spark plug.
I know you said the plugs are new you just never know if the ceramic has a crack. Had same issue and drove me nuts for a couple of days. Cheap,easy and nothing to loose by trying it. Pete
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'91 #1635 PoloGreen 350 LT5 11.09 @ 129.27 11.04 @ 128.86 474RWHP 400RWTQ http://www.youtube.com/watch?v=SFNFOhGGlR4 http://www.youtube.com/watch?v=ZlRIOMwaDYY https://sites.google.com/site/peteszr1garage |
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10-16-2009
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#6 | |
Join Date: Dec 2004
Location: Jacksonville, FL USA
Posts: 4,645
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Re: 1 Cyl miss, out of ideas, might sell cheap..LOL
Quote:
You ran down the diagnostic chart for a DTC 64? I just looked it up and the hardest step is checking the connector at the right O2 sensor. Car in closed loop @ 1200 rpm, coolant temp 95F to 203F, does scan tool read O2 voltage below .35volts ( 350mV)? If Yes, discon O2 harness @ sensor, with car @ idle speed, scan tool should display O2 sensor voltage between .35 and .55 volts ( 350mV and 550mV) Does it? If NO, refer to aids on facing page. If Yes refer to aid on facing page. If NO, then PPL ckt 998 shorted to ground or ECM faulty. The miss, I stick with what Pete said....  Or that injector is stuck shut?
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1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member |
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10-16-2009
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#7 |
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Join Date: Jul 2009
Location: Springfield Missouri
Posts: 53
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Re: 1 Cyl miss, out of ideas, might sell cheap..LOL
have changed plugs 2 times, and I ohmed? the inj and at 14, would it ohme ok and still not work?
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10-16-2009
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#8 |
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Join Date: Oct 2004
Location: Folsom CA
Posts: 1,645
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Re: 1 Cyl miss, out of ideas, might sell cheap..LOL
If you're SURE of spark, then I can think of only two conditions that will cause a a misfire with an associated Lean code.
#1: Fuel injector stuck shut. #2: ECM not firing injector. TomC "Crabs"
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TomC '90ZR1 #792 Honorary Pirate [B]If it ain't FUN, you're doing something terribly WRONG. [/B] |
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10-16-2009
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#9 |
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Join Date: Jul 2009
Location: Springfield Missouri
Posts: 53
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Re: 1 Cyl miss, out of ideas, might sell cheap..LOL
I am 100% sure of spark, but injector ohmes ok, could it still be bad? they are brand new
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10-16-2009
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#10 | |
Join Date: Feb 2006
Location: San Antonio area
Posts: 1,179
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Re: 1 Cyl miss, out of ideas, might sell cheap..LOL
Quote:
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“Buy the best example of what you want, and pay whatever it takes. That way, you cry only once.” ~ Bruce Meyer |
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