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02-01-2010
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#1 |
 
Join Date: Dec 2005
Location: Las Vegas
Posts: 108
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'91 missing and would like a second opinnion
I was hoping I could have figured this one out, but after a bunch of diagnostics I'm not really sure where to look next. So I would appreciate your guys second opinion.
At this point I have already measured, coils, wires and injectors and they are all perfect and also less than 1 year old. Also installed new plugs and they all look fine after my test runs. Also I do not get a check engine light. Car starts fine and runs perfect on idle. As soon as it warms up even a little bit the idle becomes rough and I start to hear occasional knock. when I take off it runs like a 70's vette at start and sometimes starts running smooth when I hit about 2000rpm. When I get it running normally under a steady throttle it runs fine, but starts stuttering when I step on it. So I'm wondering if O2 sensors could cause this and not give a check engine light or could it be the fuel pump?
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02-01-2010
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#2 | |
 Join Date: Aug 2006
Location: McLean, VA
Posts: 3,717
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Re: '91 missing and would like a second opinnion
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Your symtom is similar to what I had. |
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02-01-2010
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#3 | |
Join Date: Oct 2004
Location: Folsom CA
Posts: 1,650
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Re: '91 missing and would like a second opinnion
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;-) Took me 3 years and more $ than I'd like to admit, but in the end, about $5 worth of pins and a hour or so took care of my misfire. http://www.zr1.net/forum/showthread.php?t=10828 Bottom line is, did you or your mechanic use the Haibec method of checking the Ohms of the old resistors? And when you did so, did you stick the probe of the volt meter directly into the ECM plug? I did and paid the price. You can't believe how hard it was to find, but you can believe the difference it made. TomC "Crabs
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TomC '90ZR1 #792 Honorary Pirate [B]If it ain't FUN, you're doing something terribly WRONG. [/B] Last edited by tccrab; 02-01-2010 at 01:46 PM. |
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02-01-2010
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#4 |
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Join Date: Dec 2005
Location: Las Vegas
Posts: 108
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Re: '91 missing and would like a second opinnion
It's has only about year old Accel injectors, MSD coils, MSD wires and I had never pulled the ECM connector until this issue came up. So I don't think there is anything wrong with the pins in the connector...
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02-01-2010
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#5 | |
 
Join Date: Jul 2007
Location: Las Vegas
Posts: 298
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Re: '91 missing and would like a second opinnion
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1990 Grey/Black Too many for the sig. |
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02-01-2010
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#6 |
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Join Date: Jul 2007
Location: Las Vegas
Posts: 298
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Re: '91 missing and would like a second opinnion
Mikko,
if you need help, let me know. KT
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1990 Grey/Black Too many for the sig. |
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02-01-2010
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#7 |
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Join Date: Dec 2005
Location: Las Vegas
Posts: 108
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Re: '91 missing and would like a second opinnion
Thanks Ken!
I will probably try to check the O2 sensors tonight, but after that I'm pretty much out ideas...
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02-02-2010
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#8 | |
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Join Date: Aug 2006
Location: McLean, VA
Posts: 3,717
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Re: '91 missing and would like a second opinnion
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02-02-2010
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#9 |
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Join Date: Dec 2005
Location: Las Vegas
Posts: 108
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Re: '91 missing and would like a second opinnion
Yes. Injectors measure all about 15.3 cold and about 16.3 when hot
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02-03-2010
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#10 | |
  
Join Date: Aug 2005
Location: Northridge, CA
Posts: 1,457
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Re: '91 missing and would like a second opinnion
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 PS Fuel Filter? Last edited by tf95ZR1; 02-03-2010 at 02:23 AM. Reason: Wanted 2 |
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Linear Mode
