Egt temps

[Rdonovan]

Need help ASAP.... 2003 hemi 5.7 no trouble codes an runs good but exhaust seems way to hot... After ten min drive manifold reads 800f cat reads 470f an tail pipe reads 190f all stock motor only mods is lift and 35s the passenger side manifold seems hottest... Even coil spring bucket gets hot to touch.. Thanks for any help

 

[xtreme762]

I don't have a laser thermometer to measure temps for headers. But my cats run around 1k*F while idling. They cool when moving to around 700*F. So at 470*F it seems to me your running pretty cool.

My cat temps are measured with my Intune, and narrow band(OEM) O2 sensors. So I really don't know how accurate it is.

 

[Rdonovan]

U have a 5.7 hemi? Also is ur cross members under the truck hot to touch under exhaust? Just seems to hot

 

[Gecko]

What is your engine running temp? If it's running at normal temp I wouldn't worry about anything.

 

[Rdonovan]

Ect is normal not hot at all

 

[MyOhFive]

Any noticeable loss in power? Would indicate a plugged cat.

If ECT is normal, as long as your cats aren't plugged, you're fine.

 

[Rdonovan]

No don't seem to be loss on power..but was just scared maybe catch fire..like u say even the frame is hot to touch by coil spring bucket.. But isn't throwing any codes

 

[Rdonovan]

Also what's best way tell if cat is stoped up?

 

[preachp]

Loss of power, poor idle, no acceleration even under no load/ light load conditions.

preachp

 

[RedRamHemi]

Also what's best way tell if cat is stoped up?

Most exhaust shops can drill a small hole and insert a meter to check flow/pressure. Cheap test before you just start throwing parts at it. Just saying.

 

[Rdonovan]

When is the exhaust the hottest,?? Driving or ideling??

 

[Rdonovan]

How long does it usually take to reach the normal driving temps for egt at a normal drive??

 

[Redtruck-VA]

A lean condition will raise exhaust temps, but there should be a code showing excessive lean condition. The inner fenders are plastic and will melt with dangerously high temps. Don't ask...

 

[Rdonovan]

I don't think it's getting hot enough to melt inner fenders people are telling me 1,000f is normal temps for regular driving? Just seems like when u think 1000 degrees that's very hot seems as if everything around it would melt at them temps

 

[Rdonovan]

Although after a quick 10 min drive today seems like soon as it warms up it may start to get a bit sluggish... The truck sat for a yr just now got it on the road trying work the bugs out

 

[Redtruck-VA]

Do you have good exhaust flow? Maybe a blocked exhaust???

 

[xb1230]

A lean condition will raise exhaust temps, but there should be a code showing excessive lean condition. The inner fenders are plastic and will melt with dangerously high temps. Don't ask...

Red, now I have to ask?

 

[Redtruck-VA]

My lips are sealed.... just take my word for it, that a high idle in a lean condition will get things glowing.....

 

[Rdonovan]

It's not glowing red at all

 

[Rdonovan]

What u mean ur lips are sealed? Please tell me any thoughts I don't want it to catch fire