1998 knock sensor

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1998 knock sensor

Postby Dechay43 » Mon Jan 09, 2017 4:47 pm

I have a 1998 isuzu rodeo 4wd with a 2000 rodeo engine swap. I got a check engine code for the knock sensor. As most of yall know, I believe the 1998-1999 rodeo engine has an a knock sensor while the 2000 rodeo has the ion sensor spark plug I believe. But i was reading and heard that you have to buy certain spark plugs for it to work. Also, do I need to replace the ignition pack as well? I have to get emissions in February lol so can anyone help me figure out what i need to buy to fix the code.
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Re: 1998 knock sensor

Postby 5 th rodeo » Mon Jan 09, 2017 6:16 pm

this is from jerry lemont

98-99 ENGINES THE KNOCK SENSOR IS IN THE VALLEY UNDER THE INTAKE
MANIFOLD ,2000 AND LATER ENG S DO NOT HAVE A KNOCK SENSOR , THEY USE
THE SPARK PLUGS A S SENSORS , IT IS CALLED THE ION SENSING SYSTEM AND
USE THE IGN MODULE MOUNTED ON TOP OF THE INTAKE PLENUM CHAMBER , THAT
IS THE MAIN REASON THEY CAN BE PICKEY ABOUT THE TYPE OF SPARK PLUGS
THEY USE JERRY

as for me , i have a 97 nissan 240sx and the knock sensor is not a big job to change but i blew 2 of them then bought another on but never installed it , the resistance of a good ks is around 440,000 ohms ( 440k ohms ) , i cut the wires going from the knock sensor to the ecu and installed a 440k ohm resistor between the 2 wires going to the ecu , tape the install with electric tape , now the ecu thinks the ks is working ok .

this is a good fix and beats removing the intake man , it will not hurt anything unless you have the timing running at a high degree of advance , i would advise people to use good gasoline like shell .
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Re: 1998 knock sensor

Postby Dechay43 » Mon Jan 09, 2017 6:19 pm

So i can bypass the knock sensor by just adding a resistor?
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Re: 1998 knock sensor

Postby 5 th rodeo » Mon Jan 09, 2017 6:52 pm

watch this youtube ,

https://www.google.com/url?sa=t&rct=j&q ... rxHZNbxfyA

you may have to change the ks many times , this way you will never have to change the ks again , i did mine 5 yrs ago . just leave the bad ks on the car , yes the 400-440k ohms will look like a good ks to the ecu .
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Re: 1998 knock sensor

Postby sassee » Mon Jan 09, 2017 11:05 pm

If the 2000 engine is in a 98, you will have to run whatever was in the previous 98 engine. If the 98 computer is programmed to run with a knock sensor, it won't run properly without it. I put a 2000 3.5 engine in my 98 SLX and ran into the same problem. I had to use the 98 intake and plenum as well. The 2000 was not drilled and tapped for the sensor so I had to do that to install.
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Re: 1998 knock sensor

Postby Dechay43 » Mon Jan 09, 2017 11:14 pm

I believe my mechanic who installed the new engine used the 2000 engine wire harness which doesn't have the connection for the knock sensor since the 2000 uses the spark plugs
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Re: 1998 knock sensor

Postby Buster28 » Wed Jan 11, 2017 9:11 am

Dechay43 wrote:I believe my mechanic who installed the new engine used the 2000 engine wire harness which doesn't have the connection for the knock sensor since the 2000 uses the spark plugs

The 98-99 3.2L Rodeo uses a different Powertrain Control Module (PCM) than a 00-03 Rodeo 3.2L. The 98-99 uses different ignition coils than a 00-03 and it also has a different ignition system. Additionally, the 98-99 engine has a mechanically operated throttle valve and the 00-03 engine has an electronic throttle valve. The 98-99 3.2L engine wiring harness is not the same as 00-03 so it is unlikely you have a 00 engine wiring harness installed. Further, the 98-99 uses the same spark plugs as 00-03. The Knock Sensor is built into the Ion Sensing Ignition module on a 00-03 3.2L. The Ion Sensing Ignition module uses the spark plug as an in-cylinder sensor to determine combustion quality. It does this by passing a low voltage current through the plasma generated during combustion using the spark plug.

You need to ask your mechanic why he did not install the Knock Sensor when he had the intake manifold off to convert from electronic to manual throttle control.
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Re: 1998 knock sensor

Postby Dechay43 » Wed Jan 11, 2017 9:16 am

I just got everything figured out. I helped him pull the motor but he did the wiring harness and he did swap over the sensor so imma assume the sensor is just bad. Thanks everyone for your help. I love this forum
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