Cylinder/Valve Damage caused from failing fuel injector?
#11
You only need 130psi to have combustion, granted it will be garbage combustion with a lot of unburned hydrocarbons, and a fuel injector that's going crazy.
#12
Registered User
Thread Starter
Originally Posted by windhund116' timestamp='1446827419' post='23796747
AFAIK, a plugged injector should not damage the cylinder it is attached to.
Thanks for the feedback. Hopeful it is still in the valves and not the rings like you said. I used the loaner autozone compression kit and wasn't wot, i've no idea if that has any impact on the readings. Leakdown test should tell more.
I don't see the car having noticeable misfire like no combustion in the cylinder. We will see what the leakdown looks like. Thanks
#13
It absolutley can if its running to lean from poor injector flow. Just depends on how severe it is. 110 Compression is vertually a dead cylinder. I hope in the case of the OP that its valve related and not fried piston rings, any of which can be destroyed from running too lean an A/F.
Didn't the OP get a new injector ---> No CEL. Then, got same CEL later, with the new injector.
#14
lean mixture wouldn't really cause pre-ignition, a badly firing cylinder could as the unburned hydrocarbons coat the piston and create hot spots that can spontaneously ignite gasoline.
#15
I thought lean mixture was one of the primary causes of pre-ignition or detonation.
Along with, too low octane gas, too high compression, improper timing, & too hot rated spark plugs.
The plot thickens...
Along with, too low octane gas, too high compression, improper timing, & too hot rated spark plugs.
The plot thickens...
#16
If a cylinder isn't getting the appropriate amount of fuel per air, because in the OP case the injector wasn't delivering properly, then the combustion temps in that cylinder raise and you can then have a melt down of either to exhaust valves typically, the seats and or pistons. Detonation is a common symptom of high cylinder temps, but not always the symptom that causes the damage first, just adds to it. Its a short self destructing trip once there is a lack of fuel.
When I hear of a comp reading of 110, and a known failed injector on that cylinder, then I naturally conclude with the available information so far that some melt down has occurred, either through the valves or the pistons as mentioned. Fixing the injector on that cylinder and still having a misfire trigger again helps confirm the physical damage has been done. Now we need to figure out with a leak down test where the damage has occurred. I hope its just the head. That is not fun or cheap, but its a lot cheaper then a engine pull and replace.
When I hear of a comp reading of 110, and a known failed injector on that cylinder, then I naturally conclude with the available information so far that some melt down has occurred, either through the valves or the pistons as mentioned. Fixing the injector on that cylinder and still having a misfire trigger again helps confirm the physical damage has been done. Now we need to figure out with a leak down test where the damage has occurred. I hope its just the head. That is not fun or cheap, but its a lot cheaper then a engine pull and replace.
#17
Sometimes it's easier to pull the engine, because then you don't have to remove the intake manifold.
#18
Ive done both and neither are fun, but i think it would be quicker and less evasive to just pull the manifold and keep the block in the car. Not by much, but id rather stay above the car then be under it. Pulling the motor presents a whole different level of preparation and tools/help required.
#19
Originally Posted by Slowcrash_101' timestamp='1446941823' post='23797686
Sometimes it's easier to pull the engine, because then you don't have to remove the intake manifold.