Engine miss with power key on - ZR-1 Net Registry Forums

Razar · 07-07-2007

I'm a newbie ZR 1 owner and hopefully someone can help with my question. My car is a 90 with 7600 miles. Original owner mainly never drove it. I just recently bought it and it appears to have a miss when the power key is on and the secondaries kick in. This happens from about 3,000 rpm's and up. When the power key is off it has smooth acceleration. When in a lower gear and accelerating half to full throttle it sounds like an old big block with that vibrato sounding exhaust note, however when accelerating in a higher gear it just mainly bucks but still gains speed. My mechanic thinks it is the injectors. I have run two cans of fuel injector cleaner through it but still appear to have problems. Could this be normal performance or is something definately wrong.

Thanks for any help.

Richard

Black 1990

jonszr1 · 07-07-2007

you may want to get ahold of jeff @pnwzr1 he is just over the washington border. you may have a vacuum leak. the secondaries operate on vacuum. id invest in a helms manual for your car . they are very helpfull. but get on the internet and plug in jeffs place (pnwzr1 ) he is very knowledgeableon these.

07-07-2007

Sounds like you bought Bryan Powells old car. Give me a shout.

Z Factor · 07-08-2007

Quote:

Originally Posted by Razar

I'm a newbie ZR 1 owner
Richard

Black 1990

Hello Richard, and welcome to the forum.

Razar · 07-08-2007

Quote:

Originally Posted by Z Factor

Hello Richard, and welcome to the forum.

Thanks. Its been a great help so far.

jrd1990zr1 · 07-15-2007

Richard,

Welcome!

When I first got my ZR1 with about the same # of miles, it had a similar problem. I found that vibration while driving caused the power key to break electrical connection which causes the secondaries to shut down. This is something you may want to check out. Could also be a vacuum leak due to storage drying out the rubber connectors.

Good luck.

07-16-2007

Quote:

Originally Posted by jrd1990zr1

Could also be a vacuum leak due to storage drying out the rubber connectors.

Most if not all the vacuum hoses were replaced on the car this past winter before the car was sold to Richard.

Ccmano · 07-17-2007

Your mechanic is probably right. With that mileage those secondary injectors probably rarely got used. This is a very common problem even at that mileage. Have all the injectors (primary and secondary) replaced otherwise you'll be doing this over and over again. Also make sure you do not replace them with original injectors from GM, their design is prone to this failure. RC's or Accels are recommended. For that matter Jeff is recommended....

FWIW, I'm doing mine this week for the exact same problem. I'm putting accels in.

Good luck,
Hans

Razar · 07-18-2007

Quote:

Originally Posted by Ccmano

Your mechanic is probably right. With that mileage those secondary injectors probably rarely got used. This is a very common problem even at that mileage. Have all the injectors (primary and secondary) replaced otherwise you'll be doing this over and over again. Also make sure you do not replace them with original injectors from GM, their design is prone to this failure. RC's or Accels are recommended. For that matter Jeff is recommended....

FWIW, I'm doing mine this week for the exact same problem. I'm putting accels in.

Good luck,
Hans

Thanks. Let me know how the Accel's work out.

WB9MCW · 07-15-2007

CONGRATS Razar ON BECOMING A ZRONER WELCOME TO THE ZOO!

JEFF WILL GET YA ALL FIXED UP!!!

07-07-2007	#1
Razar Join Date: Jul 2007 Location: Happy Valley, OR Posts: 4	Engine miss with power key on I'm a newbie ZR 1 owner and hopefully someone can help with my question. My car is a 90 with 7600 miles. Original owner mainly never drove it. I just recently bought it and it appears to have a miss when the power key is on and the secondaries kick in. This happens from about 3,000 rpm's and up. When the power key is off it has smooth acceleration. When in a lower gear and accelerating half to full throttle it sounds like an old big block with that vibrato sounding exhaust note, however when accelerating in a higher gear it just mainly bucks but still gains speed. My mechanic thinks it is the injectors. I have run two cans of fuel injector cleaner through it but still appear to have problems. Could this be normal performance or is something definately wrong. Thanks for any help. Richard Black 1990

07-07-2007	#2
jonszr1 Join Date: Sep 2006 Location: lone pine and mammoth lakes Posts: 1,407	Re: Engine miss with power key on you may want to get ahold of jeff @pnwzr1 he is just over the washington border. you may have a vacuum leak. the secondaries operate on vacuum. id invest in a helms manual for your car . they are very helpfull. but get on the internet and plug in jeffs place (pnwzr1 ) he is very knowledgeableon these.

07-07-2007	#3
Jeffvette Guest Posts: n/a	Re: Engine miss with power key on Sounds like you bought Bryan Powells old car. Give me a shout.

07-15-2007	#6
jrd1990zr1 Join Date: Dec 2005 Location: Delanson, NY Posts: 916	Re: Engine miss with power key on Richard, Welcome! When I first got my ZR1 with about the same # of miles, it had a similar problem. I found that vibration while driving caused the power key to break electrical connection which causes the secondaries to shut down. This is something you may want to check out. Could also be a vacuum leak due to storage drying out the rubber connectors. Good luck. __________________ 1968 convertible Lemans Blue, 1986 coupe Medium Blue NCRS Top Flight (sold), 1990 ZR1 #2529 Red NCRS Regional and National Top Flight (sold), 1990 ZR1 #2124 Charcoal Metallic NCRS Top Flight 2010 & 2018, 2003 Anniversary Red Convertible (sold)

07-17-2007	#8
Ccmano Join Date: Jun 2006 Location: Sparks, NV Posts: 2,852	Re: Engine miss with power key on Your mechanic is probably right. With that mileage those secondary injectors probably rarely got used. This is a very common problem even at that mileage. Have all the injectors (primary and secondary) replaced otherwise you'll be doing this over and over again. Also make sure you do not replace them with original injectors from GM, their design is prone to this failure. RC's or Accels are recommended. For that matter Jeff is recommended.... FWIW, I'm doing mine this week for the exact same problem. I'm putting accels in. Good luck, Hans __________________ 90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold.

07-15-2007	#10
WB9MCW Join Date: Dec 2003 Location: McHenry, Il. Posts: 6,607	Re: Engine miss with power key on CONGRATS Razar ON BECOMING A ZRONER WELCOME TO THE ZOO! JEFF WILL GET YA ALL FIXED UP!!! __________________ http://i119.photobucket.com/albums/o...9mcw/SIG-2.jpg http://i119.photobucket.com/albums/o128/wb9mcw/vcm.gif "The Budget should be balanced, the Treasury should be refilled, public debt should be reduced, the arrogance of officialdom should be tempered and controlled, and the assistance to foreign lands should be curtailed, lest Rome will become bankrupt. People must again learn to work instead of living on public assistance." - Cicero, 55 BC " We the people are the rightful masters of both Congress and the courts, not to overthrow the Constitution but to overthrow the men who pervert the Constitution." - Abraham Lincoln

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