2010 Tahoe/Cylinder 1 trouble

[j91z28d1]

having 4 plus still in can slow down how faster the starter and spin over. and since you're doing a cranking compression test. a small amount of speed can cause a big difference in psi.

that's why he asked.

but yes, just replacing the injector doesn't mean its getting the signal form the ecm to open. also where did you get the injector? hang on to the old one, as it's probably best to put in back in after you solve the miss. these cheap Amazon/ebay no name injectors have a totally different opening time compared to oem. very expensive aftermarket injectors come with that data which will then be programed into the ecm to compensate using something like hptuners software. short if that, it'***** or miss.

 

[OR VietVet]

@j91z28d1, finally said what I was asking about. I guess I should have been more clear. But I would have thought my question was easy. I give up at this point.

 

[Txfiredude]

The injector was from Orileys, whatever they had for the replacement. I might have to revisit the PSI and see if that's the reason since I addressed everything else as best I could.

 

[Txfiredude]

@j91z28d1, finally said what I was asking about. I guess I should have been more clear. But I would have thought my question was easy. I give up at this point.

I put each cylinder reading on the other post

 

[j91z28d1]

I mean you can redo the the test and see if it all comes up. that back plug on the pass side is hard for most people.


if you have the old injector handy, quick test would be unplug the one on the engine, plug in the old one and hold it in your hand. start the truck. you should be able to feel it opening and closing.. there's 12v postive to one side of the injector plug and the other is ground from the ecm. it turns the ground on and off quickly to open and close it.

just something to rule out.