George:
Thanks for the quick response.
If I switch the leads from front to back, that is move the gray covered lead from #4 to #3, the same situation occurs. pulling #3 cyl. has no effect on idle, and pulling #4 causes stumble.
In other words, even if I reverse the leads on the passengers side, I still have the same issue.
Oh, and plug gaps look ok.
I checked to see if there's spark by connecting my timing light to the #3 wire. It makes my light flash, so I think I'm getting spark.
QUOTE(dr914@autoatlanta.com @ Jul 20 2007, 08:25 AM)
QUOTE(moneysmarts @ Jul 20 2007, 09:11 AM)
I thought I had a bad injector on #3. With the motor is running, when I pull the lead to #1, #2, or #4, the engine stumbles as you would expect. If I remove the connector to cylinder 3, however, nothing happens. Even though I was getting a decent spray pattern when I pulled the injector out, I decided to replace the injector. Still nothing. There IS spark at the plug. And my noid light shows that there's electrical pulses at the connector lead.
On the back of the block, under the air cleaner, I have three pairs of white wires that are solidly grounded.
Any ideas fellas?
Thanks
Switch the inj leads front to rear and see if anything changes. If so a lead problem, if not check the compression and check more importantly for intake leaks. Also make sure that you have not installed two bad injectors in a row. Some rebuilds spray fine but when installed do not work properly. Also make sure that the spark for all four cylinders is the same and that the spark plug gap is not closed!