Almost done but car wont fire

[Globalsilence]

I have an 95 240 with 90,000 MI. I rebuilt the motor with forged internals and am at the final stages. I have a walbro 255 fuel pump, deatschwerks 700 CC injectors, t3/t4 50 trim .63 AR and an Enthalpy tuned ECU. So for the past 2 weeks i have been trying to figure out why the car wont fire. It has air, fuel and spark. When i crank the car it sounds like it wants to start, but immediately the spark plugs get soaked in fuel. I just replaced the distributor rotor and got new plug wires. Checked the spark and it's fine. The distributor is in correctly, i have double checked it against the FSM and online write ups. I think the ECU was tuned wrong. If the ECU was tuned for 500CC injectors and the car actually has 700's would this explain why the car wont fire. Is there anything else i need to check? Maybe the stock FPR is bad? I don't think the injectors are leaking because all the plugs are soaked not just one or two which means either none of them leak, or all of them leak.

The MAFS is wired correctly; I checked it against what everyone said and all the diagrams. C is running to the chassis and D is going to the stock KA ground wire. I really don't know what else; I guess I’m just hoping that it’s the tune that’s wrong...

[nschultz0124]

I had some similar problems on a non turbo charged engine about 6 months ago. Make sure that all of your grounds are correct and be careful not to smoke any of them. The ground that I had wrong was the one that was supposed to go onto the battery itself. Hope this helps.

Nick

[wild_maxx]

welcome to nico global. Double check all your grounds and make sure you clean off any paint that you are grounding to. Do you have a reciept/invoice that Enthalpy sent you describing the tune they did?

Check your fuel pressure as well... your stock fpr may have crapped out on you. Cranking pressure should be about 43 psi and i believe running fuel pressure should be about 38? (not sure)

Try pulling out the fuel pump fuse and crank over the motor... may get some firing... Are you sure your firing order is correct? Good luck.

[Globalsilence]

I will check the grounds and pull the fuel pump fuse. Enthalpy didn't send a sheet with the ECU all i have is what i emailed him when i payed him. Is there a way to tell if the FPR is bad? What exatly will pulling the fuel pump fuse do? won't that make it so the car gets 0 fuel? I'm at a loss as to what the problem is.

[Craving4Boost]

you say your ECU is tuned for 550cc but you have 740's?? yes that would be a big issue. If you tuned your car to run stock 270cc and your running SR 370cc's instead..you will not be able to turn on the motor because it will flood. reflash that thing or get 550's

[Globalsilence]

you say your ECU is tuned for 550cc but you have 740's?? yes that would be a big issue. If you tuned your car to run stock 270cc and your running SR 370cc's instead..you will not be able to turn on the motor because it will flood. reflash that thing or get 550's

I just have a feeling that the tuner tuned them for the wrong size. He had the ECU for about a month. I'm having a hard time getting a hold of him also. Hopefully i can get this worked out.

[Craving4Boost]

do you get a "TRRRR" sound when you try and start it?

[Globalsilence]

The car sounds normal to me when i try to start it. I don't hear any funny sounds or anything what i consider irregular. Is the "TRRRR" Sound something out of the ordinary? Does anyone know how to check if the FPR is bad?

[LasVegas240sx]

Well for one, when you turn it over you should hear the fuel pump start. That will generally tell if it's working or not.

The ECU is tuned for a CC and you have much larger CCed injectors than it believes it has. It's pumping too much fuel into the cylinders and the spark isn't hot enough to burn it all. Like Craving said, get it reflash it or buy 550s. I believe RX-7 Injectors will work if I'm not mistaken, ones off of an FC3S RX-7.

I'm still new around here but I hope it helps.

[Globalsilence]

Stupid mistake, the distributor was off by one tooth. I thought that the paint mark was supposed to line up with the groove, when it should actually be a little to the left. Did that and boom fired up first try. Now i have to figure out why my autometer oil pressure gauge isn't reading anything. It's a mechanical gauge and very simple to hook up. Maybe the gauge is bad, i think i will install the stock warning light back up and see if the warning light comes on. Hopefully it's just a bad gauge.

[wild_maxx]

SWEET its finally running. About the oil pressure gauge... did you pack your oil pump before you put it in? pull the oil pressure gauge and see if any oil has made it up the line. I sure hope you get some oil pressure cause if not it WILL destroy your brand new motor.

[Craving4Boost]

just throw that mechanical oil pressure gauge in the garbage..i did

[Globalsilence]

SWEET its finally running. About the oil pressure gauge... did you pack your oil pump before you put it in? pull the oil pressure gauge and see if any oil has made it up the line. I sure hope you get some oil pressure cause if not it WILL destroy your brand new motor.

The line is halfway full, i'm going to hook the stock dummy light back up and see what happens. Would bad wiring on the mechanical gauge be a problem? I hooked it up to the cigarette lighter wires.