I recently purchased a 1998 dodge dakota sport Engine 3.9 V6 standard and it backfires really bad at times. I have replaced the plugs, plug wires , distributor cap both heat sensors. When it is hooked to the computer it doesn't have any codes come up other than it says temperature 59 and it won't go away... engine light is on...

 

both heat sensors what are these??

You mean the cooling thermostat?

 

One answer for you

Look at the muffler it may need replacing put your hand over the exhaust pipe does it feel strange in any way irregular?

Your muffler may be partly plugged up damaged

 

I heard bad o2 sencer can do this too

 

Read on here somewhere, I think, that somebody had a similar issue like that with a cracked coil.


My Blazer was runnin' weird. Popped the hood one night and the thing was lighting up light a Christmas tree.
At night, darker the better, pop the hood and look for arcs. Might have take the bulb out of the light holder under hood.

Night could show a glowing cat as well if you look under the truck after its been running a while. As 98DAKAZ said muffler could be stopped up as well. Haven't seen a muffler glow but followed a ford that had a glowing red cat. That thing backfired and thought I was being shot at.

Temp thing got me puzzled, digital gauge on dash or real time from odb scanner?

Think the temp sensor (thermistor) just works on ground and resistance. Hotter the truck gets the less resistance in the sensor. The more current allowed to travel in the wire(s) connected to temp sensor to the gauge. Causing the gauge to move. Could have an issue with the wire(s) or the connection on the wire going to the temp sensor.

Forget the above if mechanical gauge.

Just some things to check.

 

Ill have to check that out btw kilgore did you ever work for Viking Freight

 

Negative on Viking Freight. Currently working for "pattin and turnin.".
Pattin' the street and turnin' the corner looking for work. Telcom

 

Yeah there was kat there we called killer an his last name was kilgore