1 Cyl miss, out of ideas, might sell cheap..LOL - Page 4 - ZR-1 Net Registry Forums

tomtom72 · 10-17-2009

Quote:

Originally Posted by SharkPilot

Tyler,

How does a valve spring get broken when the cylinder fires with the valve part way open? I'm not doubting you at all it just seems puzzling to me.
Does it send some sort of shock up the valve and stress the spring?

Thanks,
SharkPilot

Wouldn't it make sense that the explosion could slam the valve back into it's seat sending a shock wave thru stem & to the spring? The impact would have a lot of energy to transmit somewhere? I could see the hydraulic lifter acting like an anvil with the sudden attempt to squeeze all the oil out of it, from the missfire, very quickly and the hole is too small to handle the oil flow?

If you don't have some one close by to lend you a known good ECM. I have a spare that will work for a 90 with a stock 90 EPROM in it. It's not a 90 ECM by the numbers, but one of the later ones that will work on a 90. Hit me up if you think you want to go in that direction.

Did you run down the flow chart in the FSM for a DTC 62? That could tell the state of your ECM also.

One other thought. I'm embarrassed to mention this. What happens when one of the 90's "quad drivers" malfunction? Could that cause just one injector to go dead?

Spanky1965 · 10-17-2009

flow chart in the FSM for a DTC 62? ???

Quad drivers??

GOLDCYLON · 10-17-2009

You mentioned aftermarket coils which have known to be a problem. Is it possible to swap out the approriate coil with a Delco unit? Great ideas guys keep em coming also can anybody close by Hook a brother up to test the ECM problem with a swap to rule that out as well?

Spanky1965 · 10-17-2009

well had the problem before I changed the coils, I 100% have spark, and yes please keep the ideas coming

Tyler Townsley · 10-17-2009

Quote:

Originally Posted by SharkPilot

Tyler,

How does a valve spring get broken when the cylinder fires with the valve part way open? I'm not doubting you at all it just seems puzzling to me.
Does it send some sort of shock up the valve and stress the spring?

Thanks,
SharkPilot

Your guess is as good as mine. I just know what did it.

Tyler Townsley · 10-17-2009

OK we need some info from you. What did you see when you tried the things mentioned especially what the plugs look like. Take them out put them in order by cyl take a picture and post the picture. Without feedback on the tests we are blind.

Tyler

tomtom72 · 10-18-2009

Quote:

Originally Posted by Spanky1965

flow chart in the FSM for a DTC 62? ???

Quad drivers??

Sorry, my senility is showing.

I meant to write DTC 64 the right o2 lean condition. If you run thru the flow chart steps you will know with a good degree of certainty if the ECM has crapped out on you. At least a definitive answer would be nice to have.

Quad Driver = Secondary Injector Relay = official GM name for the part. These can't be the issue, sorry I always forget which injectors they control.

My apologies, sometimes my fingers are in gear and my brain isn't in the loop!

Tom

gbrtng · 10-18-2009

"Quad Driver = Secondary Injector Relay = official GM name for the part."

Not so much - the quad driver is an output transistor in the ECM (probably CMOS) that provides current to 4 injectors. There are no relays in the system.

Spanky1965 · 10-21-2009

Ok guys, after $2000 of parts and Jeffvette even gave up helping me or returning my calls, I took it to the local dealer, turns out the PCM conector had poor terminal tension, they removed the bad ones and soldired and pluged it back in

Car now 100% perfect, thanks for all the help,

Just an FYI to all, watch out for some of the "experts" on here, they like to have you change parts, its not there money.

Spanky1965 · 10-21-2009

just to be clear on my last post I am very thankfull for everyone that offered ideas, I am taking about the guys that claim to be the experts

10-17-2009	#32
Spanky1965 Join Date: Jul 2009 Location: Springfield Missouri Posts: 53	Re: 1 Cyl miss, out of ideas, might sell cheap..LOL flow chart in the FSM for a DTC 62? ??? Quad drivers??

10-17-2009	#33
GOLDCYLON Join Date: May 2007 Location: Peoria, AZ Posts: 9,155	Re: 1 Cyl miss, out of ideas, might sell cheap..LOL You mentioned aftermarket coils which have known to be a problem. Is it possible to swap out the approriate coil with a Delco unit? Great ideas guys keep em coming also can anybody close by Hook a brother up to test the ECM problem with a swap to rule that out as well? __________________ 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

10-17-2009	#34
Spanky1965 Join Date: Jul 2009 Location: Springfield Missouri Posts: 53	Re: 1 Cyl miss, out of ideas, might sell cheap..LOL well had the problem before I changed the coils, I 100% have spark, and yes please keep the ideas coming

10-17-2009	#36
Tyler Townsley Join Date: May 2005 Location: Nichols, FL Posts: 615	Re: 1 Cyl miss, out of ideas, might sell cheap..LOL OK we need some info from you. What did you see when you tried the things mentioned especially what the plugs look like. Take them out put them in order by cyl take a picture and post the picture. Without feedback on the tests we are blind. Tyler __________________ 55 Polo White (Project) 61 Jewel Blue (Sold to buy above) 66 Nassau Blue 68 Torch Red 88 ZR1 Blue 90 ZR1 White

10-18-2009	#38
gbrtng Join Date: Feb 2006 Location: San Antonio area Posts: 1,179	Re: 1 Cyl miss, out of ideas, might sell cheap..LOL "Quad Driver = Secondary Injector Relay = official GM name for the part." Not so much - the quad driver is an output transistor in the ECM (probably CMOS) that provides current to 4 injectors. There are no relays in the system. __________________ “Buy the best example of what you want, and pay whatever it takes. That way, you cry only once.” ~ Bruce Meyer

10-21-2009	#39
Spanky1965 Join Date: Jul 2009 Location: Springfield Missouri Posts: 53	Re: 1 Cyl miss, out of ideas, might sell cheap..LOL Ok guys, after $2000 of parts and Jeffvette even gave up helping me or returning my calls, I took it to the local dealer, turns out the PCM conector had poor terminal tension, they removed the bad ones and soldired and pluged it back in Car now 100% perfect, thanks for all the help, Just an FYI to all, watch out for some of the "experts" on here, they like to have you change parts, its not there money.

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