|
Jack you are getting great help and guidance from bill so I dont want to interfere with that good stuff.. here are a few notes from my 240 no start experiences in case any of it helps , otherwise you guys continue on..
if you turn the motor wiht plugs out until you feel it "breathe out" of #1 and continue to TDC your distributor should point to #1 plug.
when you crank the engine , look if you have tach bounce, or speedo bounce, if so it's probably a sign its getting the signal from the TDC sensor.
if you take a small fairly low watt test lamp with an incandescent bulb , put that across the two coil connections. when cranking you should see the lamp flicker, if no flicker then you may have no spark. you can use a timing light with the button taped down if you prefer to check for a spark. ( if alone)
I had an issue where everything was ok except that the little nuts on the coil terminals were rusted and needed cleaning..
you can check the engine fuse, probably near to the air mass meter, couple of thick red wires,, might be corroded. bad TDC sensor will cause no spark.
if the test lamp on the coil does flicker f\during cranking , that means you have a TDC pulse and if the coil is getting a pulse on its primary coil then its likely sparking ok.. If you do not see a flicker, then Id suspect the TDC sensor..
I hooked battery cables up bass-ackwards once! that caused a no start because it blew the ECU - dont do that..
i was running my 740 around, ( same engine) it idled bad and then I found I had an injector stuck open.. so was running on 3 cylinders.
what I do now is take the car outside, get a proper fire extinguisher rated for a fuel fire handy.. be careful atomized fuel just takes a spark to explode never mind burn your house down..
pull the fuel rail ( order new o rings first)
hook up the grounds near or under the fuel rail bolts
put rags under the injectors, crank it , just a moment and run and see. you should see the fuel spray from injectors and wet your rags, all 4 pretty evenly.. if an injector fails to spray or if it fails to shut off completely that's a problem. be careful not to bump the end of the injectors you may damage the needles. .. if you like you can order new pintles and washers and there is a filter into them too, I believe.. that stuff is cheap..
I made a jig to backflush mine with fluids and to check them under a bit of pressure..never changed the filters mine were not plugged, there is a little tool basically a sheet metal screw used to yank the little screen filters out of them. I left mine alone.
Ive seen them stuck closed ( no fuel in one cylinder) or stuck open, (car barfs out white smoke for it's first block upon startup after sitting..)
if they stick open it will dump a bunch of fuel from the rail into a cylinder.
if you have a problem with dead fuel pump, bad pump relay, etc you won't get fuel from the injectors. if you have fuel spray, then the fuel pump is running.
when you turn the key to on after car has sat you can normally hear the pump (under floor, under drivers seat) run a couple seconds..
I once had had someone crank the car and it started then gave it full throttle without releasing key, blew up starter motor gear, wiped out TDC sensor , bent flexplate ( with holes that TDC sensor reads) to straighten bent and twisted flexplate without engine or trans removal I put a 1" hole through the bottom of the bellhousing ( with those brackets removed) so I could see and access.. it worked..
I rebuilt an engine once and got the flex plate on the wrong bolt hole, then it ran at about 700 RPM no higher.. I was so frustrated I had a shop pull the trans to turn it to correct spot.. (he was so good he diagnosed that over the phone)
using quick start is a fast way to tell if it wont run because of no fuel , if it starts with quick start you do have compression and spark.
I butchered an old fuel pump relay, and jumped it , with a fuse in there. its just to prove fuel pump runs or quickly rule out a problem if the relay dies.
if you open the line at the fuel rail and put it in a jar and crank engine , it will fill the jar very fast. that proves you do not have a plugged up fuel filter.
but again.. pumping fuel like this can cause a huge fire so please think about the risks and if you do that do it with all the precautions necessary.. If you do spray any fuel , make sure you are completely aware and ready for any consequences, this is why some of this is never recommended in a manual.
I once couldn't figure out why my car wouldn't start , then realized I had this great idea that I could prevent a possible (junky) car theft by removing the rotor ;-)
|
