Hello to whoever is kind enough to offer some information on an issue I've been struggling with this past year. My vehicle is 1992 240 DL B230f N/A non EGR and i have 2 oddities.
1. In the Bentley manual page 241-15 it lists resistance readings between pin 6 and 7 on Lh-2.4 for air mass meter wire spec to be between 2.5-4 ohms with ignition off. I already checked the Bentley Errata for any known errors with this spec.
Here are my results:
Back probing pin 6 and 7 of connector connected to Lh-2.4 - 26.5 Kohms
Back probing pin 6 of connector connected to Lh-2.4 - 00.3 ohms
Back probing pin 7 of connector connected to Lh-2.4 - 26.7 Kohms
Measuring resistance directly on terminals 6 and 7 themselves on the Lh-2.4 ECU is 26.5 Kohms
Pin 6 on harness connector to ground with harness disconnected from Lh-2.4 0.03 ohms
Pin7 on harness connector to ground with harness disconnected from Lh-2.4 - No Reading at all.
These specs were wrong according to the Bentley so i ordered a new Lh-2.4 ECU and measuring directly on the terminals of the Lh-2.4 ecu before even trying to connect it to the harness in the car and the pins 6 and 7 measured 26 Kohms (26 thousand ohms). Is this what the spec is actually supposed to be and is there another error in the bentley?
Then there is my other oddity.
2. My EZK ignition computer harness connector pin 2 (coolant temperature sensor) reads correctly according to spec (2000 ohms at 75 degrees) when the harness connector is disconnected from the EZK ignition computer while grounding on the EZK harness connector pin 20, or a separate ground on the car. Then, when the harness is connected to the EZK ignition computer, the resistance reading while back probing pin 2 decreases by more than half (to 665 ohms) while grounding on pin 20 or a separate ground point on the car. When i connect to the EZK the coolant temperature sensor resistance goes out of spec on pin 2. Do i have a bad EZK ignition computer as well or is this supposed to happen?
I have read and read on the forums but i cannot for the life of me figure out what is going on with this car since i got it. Leak down and compression tests are nearly perfect using Snap-On testing tools as well as many other tests that i have done. I've shot the parts shotgun at it twice now to make it run correctly but failing each time. As of now it has code 113 on Lh-2.4 and it did have maf sensor burn off signal lost at one point but it is no longer there. The car seems to be down a cylinder at cold starts until it is at operating temp and even then it still has a slight misfire from what i can tell so far. If anyone can help i would greatly appreciate it. If there are any errors in this post i will try and update it as it has taken me nearly a whole day to write this post. Thank you.
1. In the Bentley manual page 241-15 it lists resistance readings between pin 6 and 7 on Lh-2.4 for air mass meter wire spec to be between 2.5-4 ohms with ignition off. I already checked the Bentley Errata for any known errors with this spec.
Here are my results:
Back probing pin 6 and 7 of connector connected to Lh-2.4 - 26.5 Kohms
Back probing pin 6 of connector connected to Lh-2.4 - 00.3 ohms
Back probing pin 7 of connector connected to Lh-2.4 - 26.7 Kohms
Measuring resistance directly on terminals 6 and 7 themselves on the Lh-2.4 ECU is 26.5 Kohms
Pin 6 on harness connector to ground with harness disconnected from Lh-2.4 0.03 ohms
Pin7 on harness connector to ground with harness disconnected from Lh-2.4 - No Reading at all.
These specs were wrong according to the Bentley so i ordered a new Lh-2.4 ECU and measuring directly on the terminals of the Lh-2.4 ecu before even trying to connect it to the harness in the car and the pins 6 and 7 measured 26 Kohms (26 thousand ohms). Is this what the spec is actually supposed to be and is there another error in the bentley?
Then there is my other oddity.
2. My EZK ignition computer harness connector pin 2 (coolant temperature sensor) reads correctly according to spec (2000 ohms at 75 degrees) when the harness connector is disconnected from the EZK ignition computer while grounding on the EZK harness connector pin 20, or a separate ground on the car. Then, when the harness is connected to the EZK ignition computer, the resistance reading while back probing pin 2 decreases by more than half (to 665 ohms) while grounding on pin 20 or a separate ground point on the car. When i connect to the EZK the coolant temperature sensor resistance goes out of spec on pin 2. Do i have a bad EZK ignition computer as well or is this supposed to happen?
I have read and read on the forums but i cannot for the life of me figure out what is going on with this car since i got it. Leak down and compression tests are nearly perfect using Snap-On testing tools as well as many other tests that i have done. I've shot the parts shotgun at it twice now to make it run correctly but failing each time. As of now it has code 113 on Lh-2.4 and it did have maf sensor burn off signal lost at one point but it is no longer there. The car seems to be down a cylinder at cold starts until it is at operating temp and even then it still has a slight misfire from what i can tell so far. If anyone can help i would greatly appreciate it. If there are any errors in this post i will try and update it as it has taken me nearly a whole day to write this post. Thank you.