Im about to get an OBDI conversion within the next few weeks but i just want to double check before i do this. Has anyone had any problems with doing this conversion? Are there any disadvantages? I dont want problems with my car ive had my share of them.

 

Disadvantage = Knock sensor is no more...EDIT on a OBDI P28 ECU.


[Modified by CPR, 10:54 AM 7/24/2002]


[Modified by CPR, 1:08 PM 7/24/2002]

 

Converting your ITR to OBD1 will not disable the knock sensor.

But, using an OBD1 ECU that does not support a knock sensor will render your knock sensor useless.

ITR21, if you need an OBD2 to OBD1 ECU conversion harness please email me. Thanks.

-kenji

 

What is so negative about not having a knock sensor.

 

I stand corrected. What OBDI ECU supports Knock sensor then?

 

P72

 

If you get bad fuel that causes your car to detonate, the computer will not retard the timing. The result could be expensive engine work. Correct?

 

Oh yeah, forgot about those. So why would someone chose an OBDI P28 over an OBDI P72?

 

Another OBD1 ECU that has a knock sensor is a P13 and a P30.

I would choose a P28 over a P72 due to the fact that the p28 is cheaper, has more programs readily available, and they run a B-series DOHC VTEC setup quite well.

-kenji

 

If you have a block that doesnt have a knock sensor provision (ie, those doing LS/VTECs)

 

if you run obd1 from a obd2 you must make sure the distributor crank output is present to the ecu. i done this conmversion and it is a major headache. it is not as easy as you think. if you are cahanging the ecu only for a obd1 swap then be sure to include the crank fluctuation sensor to the ecu. as well as the rest of the sensor wires at the distributor. i am not exactly sure of the obd2 to obd1 jumper. i have one and still finding out if it works correctly. you have to understand that the oem ecu have preset default values if something is not there. it may not trigger a light but it is using a default value to run the car. (not limp mode)

 

yes, but there are other things to consider as well. if someones going to bother swaping out the ecu is most likely going to modify the engine as well. in this case, yes, knock sensor will help with the safeguarding of the engine, but of course, theres always knocking before the sensor realizes it. ... a more of a "after the fact" thing and not prevension...but its much better than just having the car knock away to its demise

 

for OBD-I conversion.

 

bearingburner,

If you have done an OBD2 to OBD1 conversion before you would know that the OBD1 ECU does not have, nor does it look for, a CKF (crank fluctuation sensor). The CKF is only present on '96-up USDM ECUs. Since you are going to be using an OBD1 ECU after doing the conversion there is no need to consider the CKF.

-kenji