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

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.

Re: Engine miss with power key on
 

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

Re: Engine miss with power key on
 

Hello Richard, and welcome to the forum.:handshak:

:cheers:

Re: Engine miss with power key on
 

Thanks. Its been a great help so far. :-D

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.

Re: Engine miss with power key on
 

CONGRATS Razar ON BECOMING A ZRONER WELCOME TO THE ZOO!

JEFF WILL GET YA ALL FIXED UP!!!

Re: Engine miss with power key on
 

Best thing to do is go see jeff . he is very fair price wise and has the knowledge to fix things others may not find . plus he will give ya the cooks tour on the car. enjoy. you may end up buying 2 like me. i go nuts if i dont get my z fix daily:mrgreen:

Re: Engine miss with power key on
 

Guys, thanks for the welcome and advice. I will see if Jeff can help me.

Richard Azar
Black 1990

Re: Engine miss with power key on
 

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

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....:thumbsup:

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

Good luck,
Hans
:cheers:

Re: Engine miss with power key on
 

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