injector problem or coil pack problem? - ZR-1 Net Registry Forums

ZZZZZR1 · 09-23-2008

hey guys,

Car started to "stumble" @ 35mph in a big way yesterday....

Lost power and seemed like the motor couldn't breath. I kept feeding the gas and it knocked more & more. Then stalled. In order to get it started I had to push the gas and white smoke would come out in 1st / 2nd gear. 3rd gear on, no white smoke (motor had minimal power).

Drove 150 miles and went thru 13 gallons of gas. Car did idle for probably 20min durring that time.

What is the best way to see if the injectors are bad and if there is a coil pack problem.

thanks!

David

GOLDCYLON · 09-23-2008

Quote:

Originally Posted by ZZZZZR1

hey guys,

Car started to "stumble" @ 35mph in a big way yesterday....

Lost power and seemed like the motor couldn't breath. I kept feeding the gas and it knocked more & more. Then stalled. In order to get it started I had to push the gas and white smoke would come out in 1st / 2nd gear. 3rd gear on, no white smoke (motor had minimal power).

Drove 150 miles and went thru 13 gallons of gas. Car did idle for probably 20min durring that time.

What is the best way to see if the injectors are bad and if there is a coil pack problem.

thanks!

David

David what year car how many miles (94)???? Does it have stock injectors its sound like injectors all the way and if I may suggest you buy FU2 injectors which are RCs right away. He has a slightly used set for $700 plus shipping (He upgraded to a stroker motor) which is a steal I paid $1250 for mine last year!!!!

http://www.zr1netregistry.com/forum/...ead.php?t=6320

Either way I suggest you replace the coil packs as your in for a plenum pull anyway. I bought set of 4 off of Ebay last year for $150. Easiest way is to see if your throwing some codes on a scanning tool. Did your SES light come on in the DIC?

-=Jeff=- · 09-23-2008

Quote:

Originally Posted by GOLDCYLON

David what year car how many miles (94)???? Does it have stock injectors its sound like injectors all the way and if I may suggest you buy FU2 injectors which are RCs right away. He has a slightly used set for $700 plus shipping (He upgraded to a stroker motor) which is a steal I paid $1250 for mine last year!!!!

http://www.zr1netregistry.com/forum/...ead.php?t=6320

Either way I suggest you replace the coil packs as your in for a plenum pull anyway. I bought set of 4 off of Ebay last year for $150. Easiest way is to see if your throwing some codes on a scanning tool. Did your SES light come on in the DIC?

jonszr1 · 09-23-2008

there is another option on injectors ficinjectors, ask for jon bosch type 2 or 3 depending on your year 380 to your door . they are flow mat5ched and have a 3 yr warrenty . i have a set in my 92 and they are awsome .

Paul Workman · 09-23-2008

Quote:

Originally Posted by ZZZZZR1

hey guys,

Car started to "stumble" @ 35mph in a big way yesterday....

Lost power and seemed like the motor couldn't breath. I kept feeding the gas and it knocked more & more. Then stalled. In order to get it started I had to push the gas and white smoke would come out in 1st / 2nd gear. 3rd gear on, no white smoke (motor had minimal power).

Drove 150 miles and went thru 13 gallons of gas. Car did idle for probably 20min durring that time.

What is the best way to see if the injectors are bad and if there is a coil pack problem.

thanks!

David

White "smoke", stumbling and dying, and loss of power sounds more like a head gasket to me. BTDT too many times myself. Pull the plugs and have a look-see. If you have a cylinder or two where the plug(s) are all white (or even have antifreeze on them!), whereas the rest are normal...I'd say gasket "fer sher". Also, if the dipstick is coated w/ something that looks like a chocolate milk shake...you have antifreeze in the crank case. Boy! I'm just full of good news, huh?

Hope I'm wrong 'bout the coolant leaks... Hope it is something simple.

P.

XfireZ51 · 09-23-2008

Coolant leak may not be head gasket. Do as Paul suggests and see if
any plugs look wet or washed. Pull plenum. Do coolant pressure check.
My leak showed up between IH and cylinder head on #4 primary runner.

ZZZZZR1 · 09-23-2008

wow....

Thanks for all the info guys! A fellow Z brother is going to help out tomorrow and hopefully figure this out!

Awesome info

QB93Z · 09-24-2008

To add some more information. The white "smoke" from the exhaust smelled like raw gasoline. I helped David pull three plugs and they looked fine.

No sign of coolant loss from the expansion tank.

When we pulled plug wires, all wires caused the choppy idle to get worse except #1. There was no change in the idle when #1 wire was pulled. The plug wire for #1 when pulled, sparked to the engine with a healthy spark.

We plan on doing a fuel leakdown test next.

Any other ideas?

Jim

-=Jeff=- · 09-24-2008

I am sticking with Injectors as my thought,, my 90 did the SAME thing this past summer

it was injectors

GOLDCYLON · 09-24-2008

My moneys on Injectors as I originally stated, And I suggest replacing the coils for good measure while under the plenum as stated as well. White smoke is indicative of Raw fuel as well. The additional information of fuel smell as adds weight to my initial conclusion. I would be interested to see what the fuel pressure was like at the rail and how long the pressure holds. That should nail down the injector consensus as well. And rule out fuel pump issues as well. Just a thought. GC

And before Franks RC Injectors slip away again Jim I suggest the owner gets Jiggy wit it pretty darn fast before they are NLA. (you can ask me the story of why they are available again if you wish!) Anddd.. Frank is dontating the cash for those 100% to our injuried Z brother... Which mean to me several things. Frank is a classy guy. ZR-1 Owners rock and I love the brotherhood.

09-23-2008	#6
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,669	Re: injector problem or coil pack problem? Coolant leak may not be head gasket. Do as Paul suggests and see if any plugs look wet or washed. Pull plenum. Do coolant pressure check. My leak showed up between IH and cylinder head on #4 primary runner.

09-23-2008	#7
ZZZZZR1 Banned BANNED Join Date: Oct 2006 Location: MD Posts: 3,690	Re: injector problem or coil pack problem? wow.... Thanks for all the info guys! A fellow Z brother is going to help out tomorrow and hopefully figure this out! Awesome info

09-24-2008	#8
QB93Z Join Date: May 2007 Location: Westminster, Maryland Posts: 3,687	Re: injector problem or coil pack problem? To add some more information. The white "smoke" from the exhaust smelled like raw gasoline. I helped David pull three plugs and they looked fine. No sign of coolant loss from the expansion tank. When we pulled plug wires, all wires caused the choppy idle to get worse except #1. There was no change in the idle when #1 wire was pulled. The plug wire for #1 when pulled, sparked to the engine with a healthy spark. We plan on doing a fuel leakdown test next. Any other ideas? Jim

09-24-2008	#9
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,136	Re: injector problem or coil pack problem? I am sticking with Injectors as my thought,, my 90 did the SAME thing this past summer it was injectors __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - 3" Magnaflow Bullet cats - LT4 Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978

09-24-2008	#10
GOLDCYLON Join Date: May 2007 Location: Peoria, AZ Posts: 9,153	Re: injector problem or coil pack problem? My moneys on Injectors as I originally stated, And I suggest replacing the coils for good measure while under the plenum as stated as well. White smoke is indicative of Raw fuel as well. The additional information of fuel smell as adds weight to my initial conclusion. I would be interested to see what the fuel pressure was like at the rail and how long the pressure holds. That should nail down the injector consensus as well. And rule out fuel pump issues as well. Just a thought. GC And before Franks RC Injectors slip away again Jim I suggest the owner gets Jiggy wit it pretty darn fast before they are NLA. (you can ask me the story of why they are available again if you wish!) Anddd.. Frank is dontating the cash for those 100% to our injuried Z brother... Which mean to me several things. Frank is a classy guy. ZR-1 Owners rock and I love the brotherhood. __________________ 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 Last edited by GOLDCYLON; 09-24-2008 at 08:43 AM.

09-23-2008	#1
ZZZZZR1 Banned BANNED Join Date: Oct 2006 Location: MD Posts: 3,690	injector problem or coil pack problem? hey guys, Car started to "stumble" @ 35mph in a big way yesterday.... Lost power and seemed like the motor couldn't breath. I kept feeding the gas and it knocked more & more. Then stalled. In order to get it started I had to push the gas and white smoke would come out in 1st / 2nd gear. 3rd gear on, no white smoke (motor had minimal power). Drove 150 miles and went thru 13 gallons of gas. Car did idle for probably 20min durring that time. What is the best way to see if the injectors are bad and if there is a coil pack problem. thanks! David

09-23-2008	#4
jonszr1 Join Date: Sep 2006 Location: lone pine and mammoth lakes Posts: 1,407	Re: injector problem or coil pack problem? there is another option on injectors ficinjectors, ask for jon bosch type 2 or 3 depending on your year 380 to your door . they are flow mat5ched and have a 3 yr warrenty . i have a set in my 92 and they are awsome .