New Accel Injectors, same problem different hole.

[tccrab]

Originally Posted by RZR

Hi Jeff,
Seattle. How about you?

RZR:

If Jeff offers to help, DO NOT turn the offer down.

Jeffie's THE MAN.

I wish he lived a little closer to me.......

TomC
'90ZR1 #792

Originally Posted by RZR

I found this thread and had to register to reply ASAP. I too am in the same exact dilemna as tccrab. I have replace the primaries with Accels, checked connectors, plugs, etc. same steps tccrab performed and yet have a consistent miss during normal driving. I have logged data using Datamaster and have definitely found a lean condition on the left side based on long term and short term fuel trims. ALSO, significant knock counts occur during higher MAP sensor readings. Spark plugs confirm the lean condition. I would be VERY interested to hear any suggestions at this time and wuold be happy to share anything I find. Interesting thing is WOT does not produce knock counts but does show a slightly lower 02 voltage reading for the left side.

How do your O2 readings look. Fluctuate rapidly? Or stagnate? Remember at WOT the O2's are bypassed. The motor is just dumping fuel, which would mask all the issues you are talking about.

[RZR]

Tom, thanks a whole lot for that info. I will do the plug test again tonight. You're right, I didnt notice it the last time I tried that approach as I could not tell whether the idle was changing after pulling the plug wires. BTW, on another topic, I was wondering if you heard of or are experiencing this. After warmup I am getting a good puff of white smoke out the passenger-side exhaust when accelerating normally from a stop. No oil smoke after that even at WOT. My ZR1 is at 58k miles. I bought it with 25k and can remember this condition ever since. Car runs strong and compression checks out so I am guessing a valve seat perhaps (HOPE NOT!). Thanks again for all your feedback, I was losing hope doing searches on the internet when I finally saw your thread here.
Ray

[RZR]

Wow, and I thought I was all alone here amidst a sea of C5's, Z06's and C6's! Thanks for forwarding the PNWZr1 site. It is really nice to know there are other ZR1 enthusiasts out here. Some of those Z's in the photos look F A S T. Mine is bone stock except for a DRM chip.
Ray

[RZR]

Originally Posted by Jeffvette

How do your O2 readings look. Fluctuate rapidly? Or stagnate? Remember at WOT the O2's are bypassed. The motor is just dumping fuel, which would mask all the issues you are talking about.

Closed loop 02's fluctuate at the normal rapid rate between 100 and 900mv's. The WOT 02 voltages were different between right and left banks however. Left was mid 800mv's where right bank showed above 900mv's. If my memory serves me right I believe the lower WOT voltage represents a leaner condition. I am assuming that this is because one of the primary injectors is failing on that side. What do you think???
Ray

[RZR]

Originally Posted by tccrab

RZR:

If Jeff offers to help, DO NOT turn the offer down.

Jeffie's THE MAN.

I wish he lived a little closer to me.......

TomC
'90ZR1 #792

You know, it is an absolute luxury to live anywhere near other ZR1 enthusiasts. I have not experienced that since I bought my ZR1 up until Jeff forwarded the PNWZr1 website link.=D>
Ray

[tccrab]

Originally Posted by RZR

After warmup I am getting a good puff of white smoke out the passenger-side exhaust when accelerating normally from a stop. No oil smoke after that even at WOT. My ZR1 is at 58k miles. I bought it with 25k and can remember this condition ever since. Car runs strong and compression checks out so I am guessing a valve seat perhaps (HOPE NOT!). Thanks again for all your feedback, I was losing hope doing searches on the internet when I finally saw your thread here.
Ray

Ray:

'90 & '91's don't have valve stem seals, they didn't seem to think that they were needed.
Your little puff 'o smoke is probably just a little oil seeping down the valve stem.
Nothing to worry about unless it gets out of hand.


TomC
'90ZR1 #792

[RZR]

Thanks Tom. I sensed it wasnt a major problem but it is certainly an ego crusher when you pull off from a light and you dump a smelly little oil cloud on the nice folks admiring the fat 11-inch-wide rubber.
Ray

[tccrab]

Originally Posted by RZR

Thanks Tom. I sensed it wasnt a major problem but it is certainly an ego crusher when you pull off from a light and you dump a smelly little oil cloud on the nice folks admiring the fat 11-inch-wide rubber.
Ray

Ray:

The trick is to leave so much tire rubber that they can't see the little puff of oil smoke.

TomC
'90ZR1 #792

[RZR]

Tom,
One other issue related to the failed injectors I experienced and wanted to see if you experienced the same. When my primary injector(s) failed, the car mis-fired, bucked and kicked pretty good - I thought I had broken the motor. Shortly afterwards I pulled over, shutdown and noticed what sounded and smelled like a catalytic converter meltdown - loud ticks and a lot of heat from the underside. A few days later I heard clunking sounds from underneath the car during idle and low speed driving. I assumed this to be pieces of the cat dispersing within the exhaust system. I am planning my approach to solving this but thought I'd run it by you to see what you did if anything. I thought about just replacing the cats but now am faced with the possibility of a blocked muffler as well.
thanks,
Ray