fuses all check out

 

I thought i remembered a prime but im sure you r right as i haven't owned the car very long.

 

So, you do have fuel???? When going to Start or jumpering the fuel pump check connector and key to ON?

That Prime comes up every once and a while and needs to be stomped on each time. Jpg out of the 87FSM attached for the Start circuit. I like the 87 FSM much better than the 88 and on. Personal pref. Easier to deal with. More straight forward than the others

And I owned my first series four for almost a year and thought the pump came on each time I turned the key to ON. Like my first gen carb car did. Wrong.

 

did you get my pm

 

just took the fuel line off and pushed the afm in while the ignition was in the on position. Yeah that was fun, it just started spewing fuel, so i turned the ignition off but the turbo timer was keeping it going until i got that disabled.

Still no fuel when cranking.

 

You have two Black/White at the Circuit Opening Relay. Right? Well I remember you saying you had 12vdc on one with the key to ON. Do you have 12vdc on the other when you Hold the key to Start? Another way to check this is to go to pin 2B (Blue with Black stripe) and backprobe that wire at the ECU and Hold the key to Start. You should have 12vdc if the key is held to Start. Both places.

Sorry, I never read PM's. Quirk of mine.

If you don't have 12vdc on the black/white or the Blue/Black, then you've just lost that signal from the start circuit and have to trace it's path backwards.

By the way, I on purpose removed the Start wire from the Circuit Opening Relay on purpose sometime last year and drove the car for months without it. Just FYI. The suction on the vane always pulled it back enough to make the pump work. Not in your case though, for some reason.

 

It's odd if you don't have the 12vdc on the black/white wire at the circuit opening relay when you hold the key to Start. There's no connection inbetween the relay and the starter if you don't count the X-08 shown in the picture. The circuit is all in the Front harness.

 

yeah no power on the starting wire when in the start position on the circuit opening relay

 

are you sure you don't mean pin 3b which connects to the starter switch?

If so on 3b i have 1.8 volts with ignition switch on on and 1.5 in the start position which i believe is supposed to be about 10volts.

 

ok so that votage i am seeing at the ecu is the voltage coming from the starter relay,right?

and the start wire on the circuit opening relay is a direct line to the starter, so i should just trace the wire back to the starter.

 

also is that X-08 a connector?

Maybe it has come unplugged or is corroded or something, alot of the wiring on this car has seen better days.

 

Yeah. that's the one. Pin 3B. If you don't have batt voltage with the key to Start, then there's an open *somewhere*.

The connector X-08 is in the 88 wiring diagrams. It's a bit different on the 87. It's hard to comprehend the starter turning over and no voltage on 3B when the key is held to START.

Lack of batt voltage on 3B during Start, results in a difficult start because the Start Fuel Map isn't being used and the afm IS being used. That results in a leaner mixture duing Start. Leaner than it should be if the engine is cold. After things warm up the starting will be normal (see graph/chart I attached earlier).

Was this car ever an automatic?

 

That Starter Cut Relay only exists on cars with Theft Protection. If you have no theft protection, you'll see a bright BLUE jumper connector under the trail coil assy that replaces the relay. the jumper in the Blue jumper connector just connects the Black/Green with the black/white. You kiind of know this is good because your starter turns over (unless you forgot to say the starter does not turn over).

Well, if you look at the wiring diagram I now attach, you can see how if someone monkey'd up the plug called X16 in this picture, then that plug could be the problem. It's a thirteen pin plug. Look for the B/L wire in it and see if it has batt voltage when the key is to Start. Look and make sure it is mating with a Black/White wire on the EM side of the plug. In other words a B/L mating with a B/W in that plug.

Should be on the bottom row, third socket over.

It's a ORANGE plug way up above and far to the right of the passengers feet. Two orange plugs,. One has fifteen pins, the other thirtee.

https://www.rx7club.com/attachment.p...9&d=1202073441 find pin 3B on the ECU and you'll also see the ref to X-16 and the black/white wire.

 

yeah the starter turns just fine

 

thanks, ill check that plug tomorrow its way to cold and dark now.