1 Cyl miss, out of ideas, might sell cheap..LOL

[tomtom72]

Originally Posted by Spanky1965

I am 100% sure of spark, but injector ohmes ok, could it still be bad? they are brand new

Yes the injector could be stuck shut and I do believe that it would OHM out okay. The ohm only gives the condition of the coil, but that will not say anything about it's spraying out fuel. Usually the plugs are a fair indicator. I found when my injectors were not spraying fuel the plugs looked like nothing was happening in that cylinder. They were as white as snow, there couldn't have been any gas going in as there was no evidence of combustion.

I hope that is some help.


Tom

[Spanky1965]

yes thanks,,,I am goign to switch one of them

[tomtom72]

I just thought of this. I was reading another thread by ZRWON. His injectors were shipped with some kind of wax like protective coating on the tips....his laid around for a long while before he used them, and one was stuck shut from the wax. Don't know if that's any use either.


Tom

http://www.zr1netregistry.com/forum/...ead.php?t=9944

[Spanky1965]

well I swapped 2 inj and #6 still does not fire, so ust be ecm?? where do I get one of those?

[tccrab]

Originally Posted by Spanky1965

I am 100% sure of spark, but injector ohmes ok, could it still be bad? they are brand new

Remember, you are only measuring the OHMs of the magnetic coil inside the fuel injector.
All that measurement tells you is if the coil is shorted out or not.
If the pintle is stuck for whatever reason, then it doesn't matter if the coil is good or not.
This "Pintle" is a little spring loaded magnetic needle that moves up and down when the magnetic field is triggered by the ECM. When current passes through the coil of the fuel injector it produces a very intense magnetic field. This magnetic field pulls up on the pintle and gas sprays out. When the current is stopped, the spring snaps the pintle back to it's shut position and the gas stops spraying.
Pretty simple stuff actually, it's amazing how simple our best technology is.

TomC
"Crabs"

[tccrab]

Originally Posted by Spanky1965

well I swapped 2 inj and #6 still does not fire, so ust be ecm?? where do I get one of those?

*sigh*

ECM's are specific for ZR1's.
The ones for LT1s look the same, but they don't work in our cars.

There are none in the GM inventory *right now*, nor have there been any for at least a year.
That may change (I hope, I hope, I hope...)

There's a guy over on the CF forum who has one for sale, $285 if I recall correctly. It's used and there's no guarantee.

There's a few on eBay, but prices are north of $450 each.

We need to find a reputable rebuilder who will work on these.

TomC
"Crabs"

[SharkPilot]

Just a thought...

Have you verified the wiring continuity from the ECM to the actual injector connector? I realize it may be a long shot but maybe there is a failed connection somplace in there that's keeping #6 inj. from getting a signal. There is a contact at the ECM connector and at the injector. I don't know if there is another plug along the line anywhere.
Can a test lamp be used to verify a signal to the injector?

All the best and I hope you find the trouble,
SharkPilot

[Spanky1965]

we are ohming the inj from yhr computer so the conection should be good, but thenk you,,,I am open to all ideas, might even take it to the chevy dealer,,,LOL

[secondchance]

If there is someone nearby w/ a 90, best way to find out if ECM is bad would be to borrow and run a good ECM and see if that fires all cylinders.

[lbszr]

Originally Posted by Spanky1965

well I swapped 2 inj and #6 still does not fire, so ust be ecm?? where do I get one of those?

If you still might need an ecm I've saved these sites but haven't checked them out. Some have said the 95 will work in the 90, but I've heard it won't work also. If it would work Corvette Central has them for 95. Hope one of these helps.


http://www.parts123.com/parts123/yb.dll?parta~partsort

http://www.autopart.com/ecc/ECC1990C...ETCORVETTE.htm