been having serious problems with my 93 Jimmy 4.3 CPI

[michaelcannon88]

code 15 is thrown coolant temp censor, just replaced censor code still there after reset, overheated bulb in dash is good but doesnt turn on while starter turns, what could be the problem. btw temp guage works fine, and there is only 1 wire going to the censor and its green, wiring diagram in Haynes book said 2 wires are needed and 1 is yellow and other (ground) black. completely stumped on this 1 need help.

Also it got warmed up the past couple times and huge surge of power lasting several seconds to a full minute wanted to jump through my garage on its own.

Any ideas?

[MT-2500]

Originally Posted by michaelcannon88

code 15 is thrown coolant temp censor, just replaced censor code still there after reset, overheated bulb in dash is good but doesnt turn on while starter turns, what could be the problem. btw temp guage works fine, and there is only 1 wire going to the censor and its green, wiring diagram in Haynes book said 2 wires are needed and 1 is yellow and other (ground) black. completely stumped on this 1 need help.

Also it got warmed up the past couple times and huge surge of power lasting several seconds to a full minute wanted to jump through my garage on its own.

Any ideas?

To start with you are working on the wrong sensor for code 15.
Code 15 is for a problem on 2 wire sensor to pcm.
Not tempt gauge.
The dash gauge has a one wire sensor?
Does you dash have gauge or hot light or both?

Explain the power surge?
Like engine speeding up on it own or fast idle?
Why are you running it in gear when testing or sitting in garage?

[michaelcannon88]

coolant temp censor is the 1 on passenger side between cylinder 2 and 4, if that is incorrect pls tell me where coolant temp censor is diagram in Haynes has no other coolant temp censor listed, dash has guage and hot light guage works finally and light wont turn on while turning the key at start up when starter turns like Haynes says it should (light is not blown)
The surge has happened several times while at idle and in gear slowing down to red lights i had to drop into Neutral to keep from running into ppl.

[MT-2500]

Originally Posted by michaelcannon88

coolant temp censor is the 1 on passenger side between cylinder 2 and 4, if that is incorrect pls tell me where coolant temp censor is diagram in Haynes has no other coolant temp censor listed, dash has guage and hot light guage works finally and light wont turn on while turning the key at start up when starter turns like Haynes says it should (light is not blown)
The surge has happened several times while at idle and in gear slowing down to red lights i had to drop into Neutral to keep from running into ppl.

There is two coolant temt sensors.
The one in head is for dash light or dash gauge.

The two wire tempt sensor to pcm or code 15 is usually on upper front of engine.

[michaelcannon88]

OK found that 1 and will try it and update on what happens ty for the help

[MT-2500]

Originally Posted by michaelcannon88

OK found that 1 and will try it and update on what happens ty for the help

Which one did you find?

[michaelcannon88]

I had already replaced the 1 on side of block thats why i needed help took out the 1 on top next to water pump and it has tons of rust and corrosion on terminals running to Advanced to get a new one and will update on tthe effect (haynes had no info on 2 coolant temp censors and autozone said nothing about it) now need to figure out what causes surging and my crap gas mileage gettin a smoke machine to check for vacume leaks and checking timing i get 15 highway btw

[MT-2500]

Originally Posted by michaelcannon88

I had already replaced the 1 on side of block thats why i needed help took out the 1 on top next to water pump and it has tons of rust and corrosion on terminals running to Advanced to get a new one and will update on tthe effect (haynes had no info on 2 coolant temp censors and autozone said nothing about it) now need to figure out what causes surging and my crap gas mileage gettin a smoke machine to check for vacume leaks and checking timing i get 15 highway btw

Coolant sensor may be part of problem.
When you get it fixed clear codes and see how it does.

Mr haynes and AZare a little slow on figuruing out there is 2 sensors.
Good luck and let us know how it goes.

[michaelcannon88]

Coolest Forum ever I love my Jimmy, censor cleared codes and runs fine besides mileage problem, will be performing a smoke machine test in the next couple weeks to find all my vacum and exhaust leaks and will keep checking in on forum to update all the more mods i will be doing and any maintenence problems I have, Thanks again for the help!!!!

[MT-2500]

Originally Posted by michaelcannon88

Coolest Forum ever I love my Jimmy, censor cleared codes and runs fine besides mileage problem, will be performing a smoke machine test in the next couple weeks to find all my vacum and exhaust leaks and will keep checking in on forum to update all the more mods i will be doing and any maintenence problems I have, Thanks again for the help!!!!

You are welcome.
Let us know how it goes.

[michaelcannon88]

I have been looking around and cant find any parts dealer that has it so maybe yall can help, I am looking to go true duals with aftermarket headers any1 kno where i can get a set of good headers with full true dual exhaust kit as well

[MT-2500]

Originally Posted by michaelcannon88

I have been looking around and cant find any parts dealer that has it so maybe yall can help, I am looking to go true duals with aftermarket headers any1 kno where i can get a set of good headers with full true dual exhaust kit as well

Why do you want do all of that racing stuff?
Headers are a big pain on a street car and a lot of times you lose power and performance and gas mileage with that stuff.
Unless you want to go a off the road racing machine you are better off to leave it as is and fix the tempt sensor.

[michaelcannon88]

Well I am going kindof Old school street rod on my truck 2tone black and red paint got 17x8 crager torque thrust for front and 17x9's on back and going to be doing a lott of major motor work making it full roller motor with a chip and will eventually go forced induction I have a good single dual setup on it now but want true duals and Headman Headers has a good set for $200 but i cant find an x pipe or anything i can install my O2 censor into that will be sattisfactory to me

[MT-2500]

Originally Posted by michaelcannon88

Well I am going kindof Old school street rod on my truck 2tone black and red paint got 17x8 crager torque thrust for front and 17x9's on back and going to be doing a lott of major motor work making it full roller motor with a chip and will eventually go forced induction I have a good single dual setup on it now but want true duals and Headman Headers has a good set for $200 but i cant find an x pipe or anything i can install my O2 censor into that will be sattisfactory to me

All of that stuff makes it not legal for on highway use.
But
If you are going to set it up for off road racing and high performance stuff and the engine is set up right than headers may help.

On the 02 sensor a good mufler shop can install a fitting for it.
f you go forced injection you will not need the 02 sensor or chip stuff.
Good Luck