I am having a problem with my car and wanted to see if it is everyone, or just me. I have a laser thermometer that I use from time to time to check the external temerature of my headers while the car is idling. I noticed that Cylinders 4, 6 and 8 are all running about 550 degrees F at idle. Cylinder 2 is closer to 250 degrees. Cylinders 1, 3, 5 & 7 are closer to 700 degrees F at idle.

I removed the A/C and Power Steering. In doing so, Cylinder 2 is 'more' exposed to the cooling effects from the radiator fans. So, I thought maybe that was causing the lower readings, however, I tried blocking the fans with a piece of wood between the fan and the exhaust primary and the temps only got up to about 350 degrees.

Can someone else shoot their primaries and tell me what numbers they are getting??

I feel like I have a mis-fire problem in that cylinder. I already swapped plugs, and injectors, checked all the wiring to it, and checked the compression on 4 cylinders. They all were similar.

Thanks!

Sean

 

I noticed on mine before they get so hot you can't go near them some are hotter than others. I will borrow my friends "laser" and see what i can get.

 

sounds to me like you're running rich on the low temp primaries.

they should be around 600+f in order for the cat to work effeciently...so you may be running rich, which would cause a quenching effect and draw away heat from the engine. but when it hits the cat and combusts it will melt it eventually...

 

His thermo reader only goes to 400 degrees so its not much good.