Update on the fuel pressure readings, turned key to position 2 - 46 psi, cranked engine -- 55 psi, sprayed fuel into throttle body and put all back on, cranked engine, on for a few seconds long enough to give pressure - 58 psi. Fuel pump works. Also, when I unplugged the throttle body sensor, it started up but ran poorly, plug back in, no start. Does anyone know what kind of problems I have? Not sure if injectors work properly. Is there something electrical that is making the injectors not work?
Please explain what you mean by the throttle body sensor. Do you mean the connector at the throttle body?
Being that you have said that all the fuses are good, you will have to see if the injectors are getting power. Disconnect the fuel injector plugs on the driver's side and then turn the ignition to position #2 and check to see if they are getting power.
Yes, if I unplug the connector on throttle body it will run rough. If I turn it off and plug it back in, no go. The voltage going to injectors are fine. All of them. Im just not sure if the injectors are working properly. If I unplug the throttle, I think it leaves the injectors partially open therefore it will run somewhat and closes completely when I put it back on. I am taking the fuel rail off and attaching 6 clear plastic bottles on the injectors to see if it is spraying any fuel out. If it isn't then why are all the injectors not working? They all can't be dead at the same time.
Yes, if I unplug the connector on throttle body it will run rough. If I turn it off and plug it back in, no go. The voltage going to injectors are fine. All of them. Im just not sure if the injectors are working properly. If I unplug the throttle, I think it leaves the injectors partially open therefore it will run somewhat and closes completely when I put it back on. I am taking the fuel rail off and attaching 6 clear plastic bottles on the injectors to see if it is spraying any fuel out. If it isn't then why are all the injectors not working? They all can't be dead at the same time.
Before you go that far in removing the fuel rail, see if you can borrow or buy what is called a Noid light. They do come in a set of 6-8 but you only need one and if it doesn't fit in the injector plug, you can fashion jumper wires between the plug and the Noid to make it operate. Google Image Result for http://www.autozone.com/images/cds/gif/small/0900823d8004a48a.gif
Was the truck running before you changed the wires and plugs? If it was, just changing them should not have any effect on the fuel delivery system. If you are getting voltage at each injector, the only thing that would prevent all the injectors from firing is the Eng. Computer. which sends the ground signal to each injector (pulse).
Before you go that far in removing the fuel rail, see if you can borrow or buy what is called a Noid light. They do come in a set of 6-8 but you only need one and if it doesn't fit in the injector plug, you can fashion jumper wires between the plug and the Noid to make it operate. Google Image Result for http://www.autozone.com/images/cds/gif/small/0900823d8004a48a.gif
Was the truck running before you changed the wires and plugs? If it was, just changing them should not have any effect on the fuel delivery system. If you are getting voltage at each injector, the only thing that would prevent all the injectors from firing is the Eng. Computer. which sends the ground signal to each injector (pulse).
Another update on the ML320. Yes, the ML was running but with #2 cylinder misfire. It was due to a corroded plug on the coil side replaced all plug wires to make sure. I had to remove coil to take the plug conector out, then replaced it and then tried to start it. No go. As for today, made six small, clear plastic bottles with holes on the cap to fit snuggly over the injectors and plugged all of cables and MAF back in. Turned the engine over, all injectors are working with the correct spray pattern. Replaced fuel rail back on and still no go. I have checked everything except kick the tires. I am getting fuel, spark is there, turns over fine but will not start. I now took a sample of fuel from the ML and a new batch from the gas station. Mid grade that I put in day before it decided not to start. I am comparing the two to see if there is any difference. To see if there is any separation of any kind from the ML gas. Gave Benz a call and tech said if all else fails, to bring it in and they can put it on the big machine to see if anything is wrong with the computer. If you guys have any suggestions of any kind, let me know. Maybe pray to the ML god or something.
If you have access to a scanner, check to see if there are codes stored. Write them down and then clear them. Then attempt to start the engine. Recheck for codes.
I do have a scanner. Nothing shows up to indicate what is going on, except when I unplug the MAF to spray starting fluid into the throttle body. That is the only time it would start up for about 1 to 2 sec. Even then, there are no other codes. It doesn't stay running long enough for it to give a code. Also took old CPS and new one to Benz to have them test it yesterday, both of them work. I don't know if the AAM or ECM have anything to do with it. It might have done something when I unplugged the battery for 2 hrs when I was changing plug wires and replacing injector seals. But for now, tow truck is on the way to take ML. After that, Im sure they'll keep it for ransom until I get another loan from the bank. I'm glad I have a dependably BMW 530i for my everyday work car. If you have anymore suggestions, let me know. Even with the dealership. Thank you.
But for now, tow truck is on the way to take ML. After that, Im sure they'll keep it for ransom until I get another loan from the bank.
I can imagine the frustration. I hope the dealer will find your problem. Let us know the end of this. From my experience, all they do is to plug the car to their PC and run several tests. I wonder what they will do to find the problem when the engine is not running.
Just got back from the dealership. Tech tried the key, nothing, then said it was a fuel issue, I told him fuel pressure is good 58 psi, injectors work with correct spray pattern, new cps, new plug wires and plugs. He said, oh. I told him to test the ECM and AAM because it deals with engine shut off. I will probably hear from them tomorrow or Monday. I will tell you guys what the outcome is when I get the $110.00 test results.
Just got back from the dealership. Tech tried the key, nothing, then said it was a fuel issue, I told him fuel pressure is good 58 psi, injectors work with correct spray pattern, new cps, new plug wires and plugs. He said, oh. I told him to test the ECM and AAM because it deals with engine shut off. I will probably hear from them tomorrow or Monday. I will tell you guys what the outcome is when I get the $110.00 test results.
same problem, but my pumps not kicking in all the time?
Last edited by gravel : 01-24-2008 at 05:54 PM.
Reason: errror
pump 
Linear Mode
