1990 CV Wagon Cranks but No Start

[Freshmeat]

Mine has a pair of black and grey 8-pin connectors, not the "salt and pepper" units. I cleaned them thoroughly and added dielectric grease to help seal them up.

[91waggin]

My experience with bad MAPS sensors has been excessive, full-rich situations that drown out the motor, and will occasionally even puke out a bit of black smoke.

This is an electrical issue associated with the ECM, methinks.

Well mine went from idling crappy but running fine to a full-on no-start situation. I did smell a fair amount of fuel when I'd try to start it, but it still would fire a couple times and then stall again.

[johnunit]

Is there a way to test the MAP without buying a new one to replace it?

I'm going to thoroughly go over all grounds again Tuesday afternoon to see if I find anything missing or in bad shape.

The local Mustang shop says there's a ground (supposed to be) bolted to the back of the intake for the injector harness that's known to rot out. I'll check that and if I don't get anything he said he has a 89 CV from which I can rob the ECM and see if it helps any. It's time to get this thing going!!

if that's the issue (or another fuel system issue) couldn't you fairly easily check by pulling an injector (while still hooked up to fuel and power) and cranking to see if fuel jizzes out? It doesn't seems like you've confirmed at all that you're getting fuel.

[gadget73]

not really any way to do that. The injectors and sandwiched between the rail and the intake, they don't actually attach to the fuel rail in any way. Its a simple seal with an O ring at each end. To pull the injectors, you remove the upper intake and unbolt the rail, and then there is nothing to retain them. Put 40 psi to them, and suddenly you've got horribly balanced projectiles being shot out of a fuel rail on top of an engine thats at WOT (open lower intake, no throttle body to cut the air). Much safer to verify fuel pressure and injector pulse with a noid light or just listening to them closely with a length of rubber hose. They tick when they fire.

The fact he smelled gas on the plugs when they were removed seems to indicate the fuel system is doing something. Also, starting fluid should make it at least attempt to run for a couple seconds even if the injectors weren't firing for whatever reason.

[import convert]

have you checked to make sure the coil is working right

[Freshmeat]

I'm getting blue spark at the plugs, so I'm under the impression the coil is fine. Hehe

[import convert]

the only things ive seen make a car do what yours is doing (not saying thats all it could be) is a bad ignition relay or bad connections to it. a bad ignition switch or a bad coil

[Freshmeat]

I'm getting a lot of "check grounds" so that will be my next step. I'll try to grab a spare MAP at the junk yard and see if that helps. Lots to try, not a lot of time to try it.

[Freshmeat]

The main harness ground that bolts to the back of the lower intake manifold was snapped clean off the stud. Of course it started raining before I could fix it, but that is very likely to be the culprit here. Once the rain stops I'm going to put a new eyelet on the wire and see if it changed anything.

[gadget73]

That should be oxygen sensor grounds if I'm not mistaken. Two orange wires? Or is it the fatter black wire that goes over to the fender?

[Freshmeat]

It comes off the O2 harness which leads to a pair of 8-pin connectors on the passenger side. Going to fix the ground then clean those connectors and try it out.

[87gtVIC]

I hope it roars to life. Too much time spent trying to get it run thus far. It must be frustrating.

[Freshmeat]

It is, but I've been hard at work gathering parts to breathe a whole new kind of life into this bad boy, so as soon as it's running, it's on!

[87gtVIC]

I would love to follow another install of a 5 speed. I have heard some talk from you about it regarding this wagon. Was it just talk? or are we gonna witness another one!?

[Freshmeat]

There will be another one but this one will be stronger.