928worldwide

Ed,
Did you run the car after the simple green and water bath? Yeah GO PITTSBURGH! You'll probably never hear me say that again....

linderpat

Glad to hear that Chris. We'll see ab out mine. I'll clean all grounds, as maybe the bath underneath caused corrossion?
Mason - I didn't run it after the bath. Thoughts?
Steelers up at half - HOOOOORAAAAY!!!!!!!!!!!!!

928worldwide

Whenever your soak a motor with water, you should run it and drive it, also, never wash a hot motor. Warm is fine, but hot is a bad idea. I think you may have wet plug wires, pull them off the plugs and check them. Blast with air if you have it. If they arc, its hard to get it running....Also, make sure no water sitting on the plugs. I know you said you looked at a plug....but did you check for water by chance?

linderpat

I agree with the above. I washed mine by hand, with squirt bottles, and only the underside. Car was on jackstands and hadn't been run for quite some time, so the engine was cold. No water near the electrical stuff up on top. I also tested spark today with a spare plug. Spark is fine, so next step is fuel - I do smell it tho

JHowell37

Landseer, your problem sounds like your engine was flooded heavily. Think back to the last time you ran your car before it wouldn't start, did you allow the engine to heat up before you shut it off? Or was it still cold? I had a brief no-start with my '85 last week. I had started it the day before but only ran it long enough to get it out of the garage and onto the driveway. And a few hours later, I moved it from the driveway back to the garage. The following day it did not want to start at all. It was doing most of the same things that you described. It acted like it wanted to start, but wouldn't. Got a little smoke with a strong gasoline odor. After a minute or two of trying, I just floored the pedal and it finally started and it did the same as you described when yours finally started.

So remember, don't start it unless you're going to let it run long enough to warm up. I don't know if other years exhibit similar behavior.

Linderpat, you said the end of your coil was loose? Could you explain in more detail? Did you try to floor the gas pedal while cranking the engine?

Landseer

Exactly what happened. Wife started it cold, moved it 30 feet, shut it down. 4 days later, totally flooded no start. Last night when it started, had to floor it. (I think WOT switch provides some advance that might have helped, just learning here). Maybe similar for Ed?

928worldwide

Ed,
Relays wiggle and swap. Fuse wiggle and swap...check the fuse terminal on the panel and the prongs on the fuse itself.....FOR FUEL PUMP< and Brains.

Have someone crank the car and listen to the fuel pump. is it turning on? If so, check the fuel pressure test port by cracking the cap off and seeing if she's pressurized (unless you have a gauge). If doing it caveman style, make sure you wear goggles and don't smoke LOL. Finally,the ECU could be damaged (unlikely) get one from a buddy to swap out for a known good one- let me know if you can't find one, I may have it.

linderpat

Thanks Mason! Chris - I'll keep my fingers crossed on that too.

Mrmerlin

hold the gas to the floor and crank till it starts to run then release the pedal

dprantl

If you know the car is flooded, it is much better for the car if you just remove the fuel pump fuse and start it, run it for a couple of seconds and then reinsert the fuse. If you get the timing right putting it back, it may not even die.

Dan
'91 928GT S/C 475hp/460lb.ft

JHowell37

This method is the equivalent of sitting down to pee. It's much more entertaining to spray a bunch of ether in it and let it rip.

dprantl

Dan
'91 928GT S/C 475hp/460lb.ft

928worldwide

I use ether all the time to bring hard starters to life and such. It's taboo on here, because everyone is scared that it will damage the MAF wires. Never happened to me, and used it on the 928 over and over. Ed, try some ether (starting fluid). If it doesn't light up right away, or there's no combustion- it's obviously a spark problem. The crank sensor may be dead. Do you know how to test it? If not, the spark brain, the connector at the crank sensor, or the loose connections at the coils???

I just resurrected an 85 euro, and the no start was due to a really dead connection at the crank sensor (and the sensor itself was bad too). I spliced into the harness and sured it up and installed a new sensor and she fired RIGHT up. Hard to imagine these crank sensors going bad, but I just had my first taste.

linderpat

Well I'm back at it - I have spark on both sides, so probably not the coil, but I've got one on order from Roger anyway. I may have discovered the problem - see this thread: https://rennlist.com/forums/928-foru...-meltdown.html

The question is, if this is due to an after-market alarm issue or similar issue involving the starter, would the car turn over nice and strong anyway even though it doesn't actually start? In other words, if a starter were the issue, whether because it's bad or cut-off due to an alarm override or whatever, would the engine still turn as if it wanted to fire?


(additional background - my starter was replaced last summer by a very trusted Porsche mechanic in Pittsburgh; it's new).

928worldwide

ED,
PLEASE - did you try ether yet? I need to know if the car is lighting the fire man! You say you have spark. Most security systems will still let the starter engage, but they cut the fire out.

Please try the ether and report back. FYI any starter fluid is fine. (aerosol).

If it's lighting up after that, your crank sensor, LH, Fuel pump, etc are the next items to look at. Even the MAF could be the problem. First....as I said before, we need to know if there's fire in the cylinder.... and at the right interval.

P>S>

I've had several occasions where a 928 absolutely would not start, and then a little ether and it cleared right up and ran fine afterward. Wouldn't that be neato!?