3.2 carrera into 69 911 won't start

[adomakin]

it won't start. got loads of fuel press, fuel at the bars, massive spark, power at the injectors (does that mean the dme is working?) lots of compression. any ideas?

andy, uk

[targa911man]

The only thing missing from your list is air. Air flow obstructed?

[targa911man]

One other thought. Bad dme or dme relay, although probably not because the fuel pump and electrics are abviously working.

[ChrisBennet]

Make sure the head temp sensor connector is fully seated. It's very easy for this connector to get pulled loose (but still look connected) in my experience. If this is disconnected, it will run sooo rich that the car won't start.
-Chris

[rattlsnak]

Spray a little carb cleaner (a couple small shots) into the throttle body, (not ether, too explosive!) It will run on it, that should tell you if its fuel or spark related. Let us know.

[adomakin]

we tryed the carb cleaner trick, but with fuel in a duck oil squirter and it
ran fine for a few seconds but then died. hmmm...... weve got fuel at the bars too, we cracked the joints and it was at both bars, and weve got a nice spark........

[dickster]

the fact that it ran fine and stopped suggests fueling to me.

when you remove the plugs are the wet or dry? if they are getting fuel and they aint firing they gotta be wet.

if they're wet and you've got a good spark, timing?

[adomakin]

weve tryed looking at the plugs after turning it over and the one that we took out didn't look wet (although it took us about five mins to get the f--ker out and any fuel had probably evaporated by the time we looked at it!)

[dickster]

sounds like you're not getting fuel squirted in there.

just reread your first post and you've confirmed there is fuel pressure at the bars but not the injectors.........that would be my next port of call.

if theres fuel getting in there and you've got a spark, its gonna fire - it may run rough, but it'll fire. from your description you've got nothing, so i would say one element is missing.

[adomakin]

but what would stop all six injectors from operating? am i right in thinking that because we have a spark and power at the injectors that the dme is working or would they work anyway?

[Carrera Sled]

Back to your first post - the injectors have power. Is that just with the ignition turned on? I'm not real up on electronics, but maybe the injectors are normally grounded thru the DME when the engine is turning over - and that ain't happening?? There are a *****load of grounds that attach on the LH manifold, and maybe up at the DME box. Maybe sensors or DME issues? I guess you could remove an injector and see if she sprays.

[ChrisBennet]

All six injectors get their signal from the same place (two pins on the DME but internally connected).
Like Ben suggested, injectors get power on one pin, and the DME grounds the other pin which opens the injector. DO NOT just ground the injector or you will burn it out.
-Chris

[addictionMS]

try tapping the injectors with a wrench to "knock loose" any dried gas. I have had to do this before after a motor sat for a long while.

I used a 17mm and tapped them pretty hard, then the car started.

plus theya re pretty easy to pull, undo all the bolts holding a rail in and then pull, they are kindo of pressed in so they require a bit of effort, then you can turn the car over to see if they are flowing, beafrefull not ot over do it and create a dangerous situation with gas alllover the place.

jim

[adomakin]

nice one blokes, i think ill try pulling out the injectors to see if they squirt when i turn it over. i didn't realise that when you unbolt the bar from the engine the injectors will stay on it. i thought they would all just fall away from the bar.

[Dan Owens]

Check the Air Flow Meter. If it's bad it won't run no matter how good the gas pressure or spark. The lack of signal to the DME unit won't trigger the injectors correctly. You can use a noid light too to see if the injectors are firing too I believe.