Having Trouble Need Suggestions - ZR-1 Net Registry Forums

C Davis · 06-10-2010

Hey guys. First a little background: Red/Red 1990 #2874, nothing exotic, top end port and headers. For the last couple of days when I first crank the car it does fine for the first mile or so and then when leaving a red light or intersection it would "bog" when pulling off. I could engage the clutch and rev the engine and it would clear or once the rpm's got high enough it feels like the secondaries open and it would clear up with no more problems during the particular drive. Yesterday I left work, same deal, no problems at first, then stumbled, then cleared up, only this time 20 or 30 miles down the road in sixth gear and cruise set on 70 mph it started bogging and stumbling again. I managed to make it home by keeping the rpm's above 3500 or so but this time it hasn't gone away. It idles rough but will idle and tries to go dead when slowing down for a stop or turn. So far it hasn't thrown any codes, but I am borrowing a scanner from a fellow forum member this afternoon to see if it will tell me something. My initial thought was injectors, but I'm hoping someone has had similer issues that was just something simple. Sorry for the long winded run on question, and thanks in advance for any advice.

GOLDCYLON · 06-10-2010

Welcome to the forum. how many miles on your car? Initially its sounding like injectors but you knew that. No SES light right?

C Davis · 06-10-2010

54000 miles and no SES light.

tomtom72 · 06-10-2010

A question, did you already change out the OEM fuel injectors?

Tom

C Davis · 06-10-2010

Quote:

Originally Posted by tomtom72

A question, did you already change out the OEM fuel injectors?

Tom

No, and that's my worry.

tomtom72 · 06-10-2010

Okay, I hear you and with reading your symptoms I have to say I'm inclined to say that your OEM injectors have gone to injector heaven.

Your symptoms kind of match what mine did when they decided to retire. The car was fine, and then it wasn't. The hotter it got, the worse the miss. It got so bad that I could stand behind the car and smell the lean thru the exhaust on the right side....made my eyes tear at a hot idle!

There is a page in the 6E section, pp. 6E3-A-14, this is a print out of what all the scan data should look like on a normal motor, at idle in closed loop. That will be your template to compare your reading to. You would be interested in the fuel numbers and the O2 counts in particular the left and right Integrator #'s and the Block Learn Module left and right. Those readings will give you the low down on what the injectors are / or are not doing.

Tom

06-10-2010	#1
C Davis Join Date: Jan 2006 Location: Sterlington LA. Posts: 5	Having Trouble Need Suggestions Hey guys. First a little background: Red/Red 1990 #2874, nothing exotic, top end port and headers. For the last couple of days when I first crank the car it does fine for the first mile or so and then when leaving a red light or intersection it would "bog" when pulling off. I could engage the clutch and rev the engine and it would clear or once the rpm's got high enough it feels like the secondaries open and it would clear up with no more problems during the particular drive. Yesterday I left work, same deal, no problems at first, then stumbled, then cleared up, only this time 20 or 30 miles down the road in sixth gear and cruise set on 70 mph it started bogging and stumbling again. I managed to make it home by keeping the rpm's above 3500 or so but this time it hasn't gone away. It idles rough but will idle and tries to go dead when slowing down for a stop or turn. So far it hasn't thrown any codes, but I am borrowing a scanner from a fellow forum member this afternoon to see if it will tell me something. My initial thought was injectors, but I'm hoping someone has had similer issues that was just something simple. Sorry for the long winded run on question, and thanks in advance for any advice.

06-10-2010	#3
C Davis Join Date: Jan 2006 Location: Sterlington LA. Posts: 5	Re: Having Trouble Need Suggestions 54000 miles and no SES light.

06-10-2010	#4
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,645	Re: Having Trouble Need Suggestions A question, did you already change out the OEM fuel injectors? Tom __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member

06-10-2010	#6
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,645	Re: Having Trouble Need Suggestions Okay, I hear you and with reading your symptoms I have to say I'm inclined to say that your OEM injectors have gone to injector heaven. Your symptoms kind of match what mine did when they decided to retire. The car was fine, and then it wasn't. The hotter it got, the worse the miss. It got so bad that I could stand behind the car and smell the lean thru the exhaust on the right side....made my eyes tear at a hot idle! There is a page in the 6E section, pp. 6E3-A-14, this is a print out of what all the scan data should look like on a normal motor, at idle in closed loop. That will be your template to compare your reading to. You would be interested in the fuel numbers and the O2 counts in particular the left and right Integrator #'s and the Block Learn Module left and right. Those readings will give you the low down on what the injectors are / or are not doing. Tom __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member

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06-10-2010	#2
GOLDCYLON Join Date: May 2007 Location: Peoria, AZ Posts: 9,155	Re: Having Trouble Need Suggestions Welcome to the forum. how many miles on your car? Initially its sounding like injectors but you knew that. No SES light right? __________________ 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