Ive got a bit of a rough idle and it takes about 2 or 3 seconds for the engine to start.


recently installed injector nozzles and new head gasket.

im gonna pull the valve cover and recheck the lash.
it will be about the 8th time in a couple of days that i have rechecked the lash.
so far all of the valves are within parameters each time i check.

im thinking a injector is leaking.

at idle the rear two cylinders are about 150 degrees Fahrenheit and the 3rd exhaust cylinder is about 130 and the very front cylinder is about 122 degrees Fahrenheit.

I checked my other 24 valve engine and it runs like a sewing machine and has about the same temp variance.

For me the tell tale sign that a injector is leaking is If I stick my face over the exhaust and take a tiny wiff It burns my nose as if its getting too much fuel at idle.

I know this sounds crazy but im trying to diagnose a leaking fuel injector.

no white smoke.
got the pass mirror aimed right at the exhaust and have been keeping an eye on it.

any thoughts, ideas or suggestions would be greatly appreciated.

 

You can swap the suspect injector around and see if the colder temps., follow it to where you moved it.

 

Crazy, no..
Can you pull them all and get them tested? You are gonna be in there anyway...

Connector tubes? Did you put new o-rings?

What brand injector? With today's incompetence abounding in the workforce, maybe??

Was gonna add that years back Hohn mentioned engine seemed to smooth out after bumping injectors to rv275 so that is what I got...I think he was right as mine seems to idle a bit smoother and seem a little quieter ater I put them in, maybe all in my head...I still have to install my fluidampr one of these days....

All I've got,

Kurt

 

Here are a few things to consider and check for diagnosing a leaking or stuck-open injector:

Steps to Diagnose:
Exhaust Smell
If the exhaust smells sharp or burns your nose, it could mean extra fuel is being dumped into the system. A leaking injector might be the cause.

Cylinder Temperatures
The temperature differences you mentioned are not extreme and may not indicate a serious issue, but combined with the rough idle and hard starts, it's worth investigating further.

Injector Return Flow Test
Perform a return flow test to check if any injector is returning too much fuel. This can help you identify a faulty injector.

Crack the Injector Lines
With the engine running, crack the injector lines one at a time (loosen the line slightly). If the engine idle doesn’t change much on a specific injector, it might be leaking or not working properly.

Inspect the Injectors
Remove the injectors and check the tips for carbon buildup or signs of damage. A leaking injector might show wetness or fuel residue on the nozzle.

Fuel Pressure Test
Check the fuel pressure to make sure it’s within spec. A pressure issue could also affect the injectors.

Revisit Installation
Since the injector nozzles were recently installed, double-check the torque and seating of the injectors. Even a small mistake can cause issues.

Additional Suggestions:
Swap a suspected injector with one from a different cylinder and see if the problem moves.
Use a scanner to look for codes or cylinder balance readings if your system supports it.
If none of these steps help, it might be worth having the injectors tested by a professional or replacing the suspect one.