jeep renix keeps falling out of closed loop

[EagleMark]

"Just Empty Every Pocket".

I hate when that happens...

I'd not even consider a stock factory dash gauge as a factor, so where does that leave the scan tool readings? If the scan tool is reading close to thermastat and MAT is close then I don't think that is the issue. Now if it's 30 to 40 degrees of then yes theres and issue!

Still sounding like a fuel pressure/deleivery issue to me? Other opinons always welcome...

[PJG1173]

the dash gauge is reading normal operating temps. I have a 185 tstat in it and can see when it opens on the dash gauge about 190*. the scan tool was showing coolant temp 220+* while the MAT was showing 180* and the dash was 190*. so I'm pretty sure the CTS is bad. I still haven't ruled out a fueling issue though, but I know the CTS being off will affect fueling too.

[EagleMark]

See that's why I have a lazor heat gun to see what temps are actually near what sensor. So where is CTS in relation to thermastat? It may be right for Jeep. But on Chevy the CTS is in waterflow right next to thermastat so temps make sense, if you put it somewhere else it get's the wrong temp. I don't know what the jeep is supposed to read.

Now if MAT is supposed to be 10 degrees lower, well it's 30 degrees lower so yeah sounds like CTS is off? How long this thing been sitting? Whens the last time it had a flush? Wondering if CTS flow is impeded in some way? If it's way overdo you could give it a good flush before buying a CTS? Take it out and flush in that hole, clean CTS and reinstall? That's all free... oh is CTS temp correct when engine is cold?

HTH!

[PJG1173]

It sat for 4 1/2 years that I know of. cooling system has been flushed and I cleaned the temp sensors when I did the head gasket. the sender for the gauge is in the head at the back about 3 inches from the CTS.

[EagleMark]

Hmmmmm? Since it's no where near the thermastat I wonder if that temp is correct?

Free test is what does CTS read on scanner cold? Should be what outside temp is...

[PJG1173]

I had to give the scanner back to my buddy. I replaced the fuel filter and the CTS yesterday and it seems to run better. Idle quality is better when up to operating temp, so I'll see how it goes in a couple of days I'll borrow the scanner back and check the CTS and BLM's. whe I changed the filter I poured the fuel out the inlet side to see what color it was. it came out with a slight tint of purple not rusty brown like I suspected.

[EagleMark]

Never seen purple gas?