Re: Did fuel injector cleaner cause problem?
 

It is easy to check your fuel injector resistances to see if you have fuel injectors going bad while you are checking the coil/wire resistances.

Go to Marc Haibeck's website and he has an article posted (http://www.zr1specialist.com/HAT%20W...Resistance.htm) that describes doing the check.

There are also other threads in this forum that talk about doing the fuel injector checks. Search on fuel injector resistance.

Re: Did fuel injector cleaner cause problem?
 

I would suggest you verify fuel pressure. Z's are very sensitive to lower than normal pressure. Low speed and idle conditions seem to be effected early on and it just gets worse as one or both fuel pumps deteriorate. This is a relatively easy test and does not involve removal of the plenum.

Re: Did fuel injector cleaner cause problem?
 

As I suspected he has about a months worth of work going now, but he said he would try to help you out.

PM on the way.


If you have confidence they can diagnose and fix your issue/s along with the other work then go for it, but I would not have them do different work while it is running poorly until you get your primary problem fixed first.

:cheers:

Re: Did fuel injector cleaner cause problem?
 

Ok now I'm confused. After pulling and plugging back in the plug wires and various sensor hoses, I planed to go to the next step and purchase a voltage meter and new fuel filter for my next phase of testing.

While enroute to the auto parts store, I noticed that the Z was running like a top with none of the aforementioned issues. So I kept driving, and driving, and driving. I ran it hard, I ran it gentley. I got it hot, I cooled it off. I drove it at low power, I drove it full power. I shut it down, I started it back up. Half a tank of gas later, not a single issue.

I am convinced that I do not have a flywheel problem since the rattleing and low pitched hum under acceleration was gone. Whatever was happening with the way the motor was running, affected the drivetrain.

The car ran smooth and idled smooth. It niether bogged or sputtered.

What gives?

Re: Did fuel injector cleaner cause problem?
 

Happens to me alot. As if by majic something clears out and all is well. Electronics probably accounts for these flip flops. ECM's CCm's etc can turn on you as well as a myriad of sensors and connectors. Then correct themselves with no rhyme or reason. Just drive it and enjoy. Eventually the problem may show up so significantly that you can pin it down.

Re: Did fuel injector cleaner cause problem?
 

It could be an intermittent fuel or electrical issue so you may not be out of the woods yet.
Are you on a different tank of gas? Who knows, you might have just gotten a bad batch the last fill up.
Lets hope everything is ok, but my guess would still be fuel injectors if it comes back regardless if the cleaner caused the problem to surface or not.

Re: Did fuel injector cleaner cause problem?
 

Deus ex machina! :)