hey guys, Mook again. let me bring you up to speed, doing a 2.3 to 5.0 swap in my 93 fox. everything is in and the engine runs, but not well. the 5.0 originally came with a SD ecm/harness. I have since bought a 93 MAF harness and ecm to match my 93 chassis. with the SD ecm connected to the MAF harness, with no maf connected and a vacuum line run from the intake to the map sensor the car would run but would not idle well as my camshaft (e303) does not play well with SD. BUT all sensor reading were with in normal limits.
Since replacing the SD ecm with the 93 MAF ecm (remanufactured unit bought from Oreilly's) the TPS voltage shows a constant 4.98v closed and 5.01 @WOT with koeo. I thought maybe I missed a ground on the harness or possibly had something grounded to the chassis that needed powered. I have been chasing this for about 2 weeks. still no progress. As far as I can tell from diagrams and my memory of removing the wires the first time around I have not missed any grounds. Though there is one ring terminal on the harness that goes inside to the dash that I am not 100% sure if it's a ground or not, but i have been grounding it. I'll attach a picture. It is on the same harness as the yellow fuse link with the ring terminal that is connected to starting solenoid. and i noticed it has continuity with the yellow fuse link when the doors are open and the door switches arent pressed. making me think its a ground for the lights inside.
I have the injector harness ground connected to the back of the cylinder head to the same bolt that has the ground strap that goes to the firewall. Do i need to make it a separate ground?
I disconnected the ecm and tested pin 46(signal return) at the self test connector by connecting one lead on DVOM to it and the other to chassis ground. koeo voltage shows 00 which means its an open circuit and functioning normally correct?
Afterwards i tested pin 1 on MAF connector (ecm still disconnected from harness) along with pin 37 and 57 on the ecm connector all had 12v.
I then reconnected the ecm and did the koeo test again with pin 46 at the self test connector and BAM! 4.98v constant. which from my understanding it need to be around 0.5v with ecm connected and koeo.
Also I've been getting mixed information on whether or not pin 46 on the ecm itself should have continuity with pins 40 and 60. I tested mine none the less, and there is no continuity between 46 and 40 or 60. but there is continuity between 40 and 60 which is to be expected.
I would like to think its not the ecm that's bad since it is a brand new (reman) unit. And if it is bad, was it something with my harness ie a short somewhere that could have fried something inside? I have talked to orielly's and they have ordered me a new one but I'd hate to plug that in aswell and fry that one too. if it were infact something wrong with my harness.
Any thought's at all would be greatly greatly appreciated. this has been driving me nuts as it seems to be the only thing keeping me from driving this car, which has been sort of a dream project for the last 5 years.
Since replacing the SD ecm with the 93 MAF ecm (remanufactured unit bought from Oreilly's) the TPS voltage shows a constant 4.98v closed and 5.01 @WOT with koeo. I thought maybe I missed a ground on the harness or possibly had something grounded to the chassis that needed powered. I have been chasing this for about 2 weeks. still no progress. As far as I can tell from diagrams and my memory of removing the wires the first time around I have not missed any grounds. Though there is one ring terminal on the harness that goes inside to the dash that I am not 100% sure if it's a ground or not, but i have been grounding it. I'll attach a picture. It is on the same harness as the yellow fuse link with the ring terminal that is connected to starting solenoid. and i noticed it has continuity with the yellow fuse link when the doors are open and the door switches arent pressed. making me think its a ground for the lights inside.
I have the injector harness ground connected to the back of the cylinder head to the same bolt that has the ground strap that goes to the firewall. Do i need to make it a separate ground?
I disconnected the ecm and tested pin 46(signal return) at the self test connector by connecting one lead on DVOM to it and the other to chassis ground. koeo voltage shows 00 which means its an open circuit and functioning normally correct?
Afterwards i tested pin 1 on MAF connector (ecm still disconnected from harness) along with pin 37 and 57 on the ecm connector all had 12v.
I then reconnected the ecm and did the koeo test again with pin 46 at the self test connector and BAM! 4.98v constant. which from my understanding it need to be around 0.5v with ecm connected and koeo.
Also I've been getting mixed information on whether or not pin 46 on the ecm itself should have continuity with pins 40 and 60. I tested mine none the less, and there is no continuity between 46 and 40 or 60. but there is continuity between 40 and 60 which is to be expected.
I would like to think its not the ecm that's bad since it is a brand new (reman) unit. And if it is bad, was it something with my harness ie a short somewhere that could have fried something inside? I have talked to orielly's and they have ordered me a new one but I'd hate to plug that in aswell and fry that one too. if it were infact something wrong with my harness.
Any thought's at all would be greatly greatly appreciated. this has been driving me nuts as it seems to be the only thing keeping me from driving this car, which has been sort of a dream project for the last 5 years.