ZakRising
NAXJA Forum User
- Location
- Southern California
The guage is freaking out everytime I hit a bump it fluxuates from cool to boiling hot then goes back to normal temp.
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Temp Guage freaking out
- Thread starter ZakRising
- Start date
xcm
NAXJA Forum User
- Location
- Southern Oregon
Sounds like an intermitant ground thats bouncing all over the place.
Check the sensor wiring.
Check the sensor wiring.
ZakRising
NAXJA Forum User
- Location
- Southern California
The wiring all looks fine. Is it something to stress about?
Vanimal
NAXJA Forum User
- Location
- escondido, ca
mine bounces around, and it's definitely the gage or wiring. i just take the average lol
my tach doesnt work occasionally as well. it's also running a little rough when i first start it in the morning. my guess is maybe a ground, but i havent investigated as to which one.
my tach doesnt work occasionally as well. it's also running a little rough when i first start it in the morning. my guess is maybe a ground, but i havent investigated as to which one.
TA2Jeep
NAXJA Forum User
- Location
- 661 - $o*Cal
On my LT1 Firebird, I had this happen and it was the wire for the temp sensor introducing itself to the header and getting burned..
ZakRising
NAXJA Forum User
- Location
- Southern California
Thanks guys!
cruiser54
NAXJA Forum User
- Location
- Prescott, Az
At the driver's side rear corner of the head is the sender. Purple wire IIRC? Unplug it and inspect the connection. Is it loose?
birchlakeXJ
NAXJA Forum User
- Location
- Melrose, MN
As the guys already said, verify wiring and connector going to that coolant temperature sensor; those are primary suspects here if it is an "instantaneous" up and down change on your gauge. This is electrical and what you are seeing on the gauge is not likely real.
BLU-125
NAXJA Forum User
- Location
- Lismore NSW Australia
So what does the sender in the thermostat housing do? 1999 Update 4.0l. I have been getting occasional fluctuations in speedo & tacho and the temp gauge drops to 40 (degrees Celsius), and the Scangauge plugged into the OBD2 socket follows it.
It will then swing to around 112 deg Celcius and a CEL will come on. Sometimes the engine cuts out, but will restart fairly easily. Get a 118 code which I can clear and the CEL goes out.
It will then swing to around 112 deg Celcius and a CEL will come on. Sometimes the engine cuts out, but will restart fairly easily. Get a 118 code which I can clear and the CEL goes out.
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hubs97xj
NAXJA Forum User
- Location
- Fort Wayne, IN
On 97+, the PCM drives the gauges, so they use only the single sensor in the tstat housing. On earlier models, the gauge was driven by a separate sender in the back of the head.
I'd inspect and clean the power and ground connections under the hood, and have a look at the CTS connection and wiring. Look for corrosion, loose connections, damaged wires, etc.
I'd also test the CTS. The resistance table for the CTS is posted on here if you search a bit.
I'd inspect and clean the power and ground connections under the hood, and have a look at the CTS connection and wiring. Look for corrosion, loose connections, damaged wires, etc.
I'd also test the CTS. The resistance table for the CTS is posted on here if you search a bit.
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