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08-22-2012
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#1 |
Join Date: Jun 2012
Location: North Carolina
Posts: 22
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Rough Running Z
I posted some history under another thread for Cam Position Sensor, but here is the problem. After no issues for 2 years, the car started missing suddenly about 10 seconds after startup. The SES light came on and was traced to fault code 31 - Cam Position sensor. The sensor was checked and determined not to be the problem, but in the course of suspicion of the common injector problems in 90-92's a couple of bad injectors were found. New Delphi SS injectors were ordered and installed, but upon startup the car still ran as if on 5-6 cylinders and then stalled and wouldn't restart. Fuel pressure was checked and is fine. Spark plugs were pulled and checked and are fine and do not appear to have been flooded with fuel and we do have spark.
Anybody got any other ideas of where to look to find this elusive problem?
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Charlie 1990 Dark Red ZR-1 formerly owned by Chip Miller |
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08-22-2012
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#2 |
 Join Date: Feb 2011
Location: San Marcos CA
Posts: 1,802
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Re: Rough Running Z
do a compression and/or leak-down check on the cylinders.
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08-22-2012
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#3 |
 
Join Date: Feb 2006
Location: San Antonio area
Posts: 1,179
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Re: Rough Running Z
something under the plenum is out of ordre - hosed up during the injector replacement.
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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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08-22-2012
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#4 | |
   
Join Date: May 2007
Location: Peoria, AZ
Posts: 9,155
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Re: Rough Running Z
Quote:
Yep Bent pin etc, check the wiring you might have pinched something
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GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director  91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V |
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08-22-2012
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#5 |
Join Date: Aug 2008
Location: Houston 90 Red ZR-1
Posts: 2,320
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Re: Rough Running Z
Check to see if the MAP hose is unplugged.
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08-23-2012
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#6 |
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Join Date: Jun 2012
Location: North Carolina
Posts: 22
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Re: Rough Running Z
Actually traced back to a bad ECM. Anybody know sources to find one or get one rebuilt?
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Charlie 1990 Dark Red ZR-1 formerly owned by Chip Miller |
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08-23-2012
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#7 | |
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Join Date: Feb 2006
Location: San Antonio area
Posts: 1,179
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Re: Rough Running Z
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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08-24-2012
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#8 |
Join Date: Oct 2004
Location: Folsom CA
Posts: 1,655
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Re: Rough Running Z
New ECMs have become very scarce and very pricey indeed.
I remember a thread a few months ago which referenced a company that refurbished our particular ECMs. I will have to go digging around to find it. Don't get false hope if you should find an ECM listed on some car parts web site. It'll be for the L98 or the LT1 not the LT5. Check with Marc Haibec, he'll either have one or know where to get one. '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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08-24-2012
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#9 |
Join Date: Mar 2008
Location: Pendleton, IN
Posts: 659
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Re: Rough Running Z
I have a known good, used ECM out of a low-mile '91. I'm really not looking to sell it but if you absolutely can't find one send me a PM.
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09-03-2012
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#10 |
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Join Date: Jun 2012
Location: North Carolina
Posts: 22
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Re: Rough Running Z
I ended up finding a rebuild service thru Rock Auto for about $200. The other source I found was Kurt White Racing - he had rebuiult ECM's in stock but they are $699. NAPA also will rebuild and will send it from any store for about $250 - probably the same rebuild service as Rock Auto (A-1 Cardone).
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Charlie 1990 Dark Red ZR-1 formerly owned by Chip Miller |
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Hybrid Mode
