Yeah cleaned that tip up pretty good. Today coming home from church it would be below the 210 tick while moving but right when I'd stop it'd jump above 210. It seemed to idle higher than usual at 700ish rpm. I think I'm going to try to go down to the dealer this week and hopefully it's just a faulty thermostat causing the heat spike.

 

Dealer stat will be good. If that doesn't do it, I'd be suspicious of the fan clutch if it spikes at a stop.

 

Try the temp sensor on the tstat housing its choke asjustment on an obd1 amd do not uae 180tstat they can overheat the jeep to

 

Where in the world do you get your info?

 

What??????? This definitely needs to be rationally explained.....choke adjustment on a EFI motor?????

 

Is it possible to use a obd1 sensor to control the fan?
And from my understanding the jeep has 3 coolant sensors. One in the radiator to control the fan turning on, one at the back of the block to control the gauge, and one at the bottom of the block for the ecu correct?

 

Let me rephrase it then the temp sensor on the tstat housing on. 91 to 95 i have a 95 is a monitor for cold start and warm up the one in the head is for temp guage and i can prove tjis cause if i disconnect the one on the tstat my jeep will high idle i ha e also read some where kn here that its aux fan and emission test monitior for thw pcm good lucky with the heat and rough idle i used to get weird heat up changed radiator and it was mint as for rough or low idle the iab worked for me

 

Oh and efi has a choke buddy its called the iac valve closed on start ups

 

Correct. What are you trying to do?

 

No. That just controls the idle speed. The ECU controls the mixture by adjusting the fuel injector pulse width based on input from the MAP, CTS, and IAT. Then in closed loop, the O2 sensor becomes a major player.

 

Doesn't the IAC also function at hot idle?......why would u need a choke when the motor is hot (at operating temp)?

 

Im a diesel machanic and on most diesel engine the use an iat intake ambient temp and cts coolant temp sensor to adjust fuel time and fuel ratios then obviously the o2 sensor montiors nox and co and makes fine tune adjustments off that info i would image that a gas motor would be simalar that a temp sensor would be a key pid in fuel timing ignition timing and so on but i could be wrong cant know everythong just trying to help

 

So which one of us is his buddy? You take the reins djb383!

 

Sorry you guys must be right never mind

 

IAC is not a choke. Google IAC.