tasha

We have a '88 turbo 2 10th anv. we bought 3 weeks ago. Very nice car We just replumbed the fuel system with Earl's all is well there. We went to start the car and it begain to start then just died. Now we have no spark at all and fuel pump is'nt coming on either.
We diconnected the 2 lines that go back to the trans. back up lights, emitions saftey line these lines where all cooked toghter up by the motor bay. The car ran fine with the lines like that so we disconnected them. Thinking the wont matter much. I would not image that the will play apart in the motor running or not.
Does anyone have any idea why we would lose spark and fuel pump power at the same time ? We have checked fuse block under hood and by the drivers side cluch.
This car is heavely motified and a lot of the b/s has been removed, heating etc. Car ran great before we lost spark and power to the fuel pump. HELP (wife wants her car back)

hypntyz7

Losing spark and fuel at the same time sounds like a possible problem in the AFM or connnection, but it doesnt make sense.

How have you determined you have no spark? The best, adn only real way to do so, is to use a spare plug. Take off one of the wires, (I use l1) from its plug. Lay this wire, with the old plug inserted, by a good ground within view of the inside of the car. I use thej strut tower bolts by removing the dust cap. Crank the car and watch for sparks..if it is within 1inch of a good ground, it should spark white/blue. IN general, if you have spark, you have it on all 4 wires.

I think what happened given your description is that you crossed the cuel lines soewhere. One is a high pressure supply, one is a low pressure return...the car wont run with them switched backwards. IN stock form, the one coming from the fuel filter goes to the supply lead on the engine...if you still have the stock vacuum rail and it isnt bent all up, this feed is the FRONT of the 2 fuel rail lines...the rear is the low presure return, and goes to the firewall and straight back to the fuel tank. IF you are not using your stock fuel rail, the supply goes in to the lower fuel rail, primary, and the return comes out of the upper one, secondary...the fuel pressure regulator(on end of 2ndary) is the last component in the fuel system. Double check your lines and give it a try.

tasha

we checked for spark by using a spark intincity gage and we have'nt mesed with any of the retun lines. Infact it looks as if they have been removed.
The only thing we messed with on the fuel delivery is from the firewall up and just repaced what was there to begin with. We havent messed whith any of the conections on the electrical system at all so we're not sure where to begin if u have any more sugestions we would be more than happy to try them. thank you.


p.s. not to sound like an idiot but what is the AFM? This is our first rotary so we are still geting used to all its components.

tasha

hey man, i'm the guy who rolls the wrench time on this car. Let me give you a better understanding of what we did from the firewall to the motor. This car has two fuel lines from the gas tank to the engine bay. One fuel line run off a aftermarket fuel pump in the tank. This line is a stock hard line thats runs to the engine bay. The second fuel line has been dubed in with 3/8" hard line. The fuel pump for this line (high pressue secondary 720) is located on the firewall. (mustang cobra pump) Runs between 60 and 40 psi. The stock fuel line coming off the firewall runs into Earl's high pressure lines and fittings. Now into a 80 micron 6an fuel filter.Then into a airomotive fuel pressure reg to the fuel rail primary 540. The second line runs into Earls high pressure line and fittings now on to a 80 micron 6an fuel filter. Then on to a nos 6an Y, from there one side of the Y runs into a seperater/inverter. then into a autometer fuel psi gauge in the cab. The other side of the Y runs into a 6an gauge fitting with a 1 1/2 fuel psi gauge then into the secondaries with a 6an to a 12mm x 1.25 fitting. Giving you a better understanding on what we did.

hypntyz7

SO basically you have taken the stock fuel supply/return lines, ands converted one of the return lines to another supply line.

Damn, you have a HELL of a lot of fuel flow and pressure, and though I dont know what all else has been done to warrant this knd of mod, I can say that the thing must be runnning HELLA rich and that might be why it wont start.

Im not saying it wont run like that, like I said I dont know about your entire setup or anything, but thats the first I have ever heard of anyone running 2 fuel, supply lines, on a rotary.

I also saw no mention of an aftermarket FPR. LEt it be known that the stock FPR acta like a one-way valve, which is why mixing up the stock supply and return nets you a car that wont run...the FPR should be the last component in the order of fuel flow.

tasha

Yeah hell of a lot of fuel flow and pressure, your right but, it has worked great for about 3 years like this. Undersrtand this car is highly...highly modified.

But the set up is not new,.. all's we did was replace the fuel line with a new better high pressure line and add a inline fuel filter. Thats what's got us confused about it not running. Nothing is different, but the inline filter. And we did cut out the backup lights wiring, sense they where fried and melted to the under side of the car. But thats doesn't effect anything. So we are left with the replacment of the ECU. Hope that will fix the problem. Thanks for your help and advice.

hypntyz7

I really, really doubt that ecu is your problem. I have never seen one go bad on its own...either they die from flooding(water) or fire/short in the wiring harness.

Ryde _Or_Die

Losing spark and fuel pump at same time? Hmm...I would say try to ground the car. Run some grounds from the battery, alternator, block, etc. Just seems weird to lose both. How are you sure you are losing the fuel pump anyways? You checked it with an O meter? I would say a bad ground. Thats just a guess though.