No start-need assistance

[AvantGuard]

Pulled engine to install KO4's and new clutch w/dual mqass flywheel. Have not been able to get engine to run since re-install. No codes. Have spark at plugs, have fuel pressure at fuel rail, fuel pump relay pulls in, checked all fuses and grounds, substituted another ecm, put test light on fuel injector and it showed cycling voltage to injector, installed known good cps. Flywheel can't be mis-clocked-it will only go on one way. I am pretty much at a loss of where to look next. Would appreciate any suggestions.

[AvantGuard]

And by the way, it will run perfectly on starting fluid, so obviously some type of fueling problem.

[Quattro_The_Dog]

If you didn't change timing than you must not be getting spark or fuel. The engine literally has to fire if you have air spark and fuel. Double check you are actually firing your coils and lift your rail to see if injectors spray.

If you did an aftermarket flywheel is it a off name one with the tone ring messed up? Heard of some with it misaligned.

[DiertyEuroSpec]

Did you attempt to run with the MAF unplugged? If so what happened then?

[Quattro_The_Dog]

You just said you have fuel... obviously you don't.

[erykv1]

get a gauge and check fuel pressure at the rail, report back :)

[AvantGuard]

QUATTRO,
I stated that I have fuel at the fuel rail- the fuel pump runs. I will check pressure at the fuel rail rail tomorrow.It has to be something stupid and simple, like I have the fuel lines hooked up incorrectly on top the engine. I will also try to run with the maf disconnected. Appreciate all the responses and will respond again tomorrow after chasing my tail some more. The flywheel is a stock dual mass flywheel. The car runs perfectly with starting fluid- that would tell me the timing is not skewed. I am just not getting fuel for some reason. What's odd is that installing a 12v test light on an injector, I get normal pulsed voltage to the injector, so possibly I am having insufficient fuel pressure.

[jsethwerner225]

Is it turning over? Try the crank position sensor..I broke mine off and didn't notice, it'll turn over all day long but won't start up..changed that sensor and it cranked right up..

[jaychen]

Did you install a new fuel pump? If so, what sort? And how was it wired?

[AvantGuard]

Did not install new fuel pump. Tested fuel pressure at fuel rail today-have plenty of pressure. Replaced new crankposition sensor with known good one-no change. Tried unplugging maf-made no difference. Checked all grounds many times. Can get it to run with starting fluid so I know the problem definitely is the injectors are not firing. Tried a new ecu-no change. Allk it will do when I try to start it is sputter. Turns over fine. Again, I'm lost. Any suggestions appreciated.

[erykv1]

did you by some chance put the fuel feed in the return and the return in the feed when reassembling, it will still read pressure if thats the case.

if the routing is correct, check fuse / relay box on the injector ground side.

[Quattro_The_Dog]

Sorry for the rolleyes, I see you actually said fuel rail now.

If you have vcds you can fire the injectors.

[jaychen]

So you have physically removed the rail (with feed and return still attached) and flipped it up and tried starting the car (to verify fuel is spraying out of injectors)?

Have you taken the coils out and left the plugs in the end of the coil and watched to see if they're sparking?

Back to basics, but if you have a good ecu, fuel and spark.. things ignite.

[zillarob]

Got all the plugs in good up by the ecu? Grounds on the back of the head and behind the coolant res?

[AvantGuard]

jaychen and zillarob::
Thanks for your suggestions ! I will pull the fuel rail today and flip it and try to start it and see if I get any fuel spraying from injectors, although I am fairly certain I am not, because spraying starting fluid allows the engine to run for a few seconds. I have already verified I have spark as you suggested. Zillarob- I have been over the grounds multiple times and they are all attached - even removed them and sanded aconnectors and ground location. Have also installed a different ecu thinking I might have an issue there, and made sure all plugs were tight, but same result with either of them. Removed the plastic cover from the fuel pump relay and crankeed engine over to verify realy was working and it is. Chedked fuel pressure and it is good also. Again- thanks to all for the helpful suggestions. I have searched and searched for a motronic schematic but there doesn't seem to be one available online. That would be helpful to trace back fuel injector coil wiring. I understand there is 12 v to the injectors with the key on and that they are grounded thru the ecu to fire the coils.

[jaychen]

if your car worked before you pulled it apart, im 99% sure it's hardware related.

check to see if you have fuel physically spraying, if you do not, something is a miss (obviously).

methodically work backwards from the rail.

have you bench tested the fuel pump? I know you said you have pressure, but just for the sake of it?

cant really screw the feed/return up, one is threaded, one is not.

[AvantGuard]

if your car worked before you pulled it apart, im 99% sure it's hardware related.

check to see if you have fuel physically spraying, if you do not, something is a miss (obviously).

methodically work backwards from the rail.

have you bench tested the fuel pump? I know you said you have pressure, but just for the sake of it?

cant really screw the feed/return up, one is threaded, one is not.

Jaychen-you were exactly right! Determined that the injectors were not spraying fuel. Assumed it was an electrical problem somewhere down the line-wrong assumption. It turns out it was the fuel injectors themselves-all six of them. I am going stage 3 and had ourchase some green giants from a member on the forum quite some time ago. They sat for a while at my location and who knows how long he had them sitting around before I bought them. Every single one was plugged totally. Put my old injectors back in and the car started immediately and runs fine. Can't thank everyone enough for all thye suggestions. I have an Awe stage 3 ecu. New Ko4's just installed along with Rs4 clutch, catless downpipes and Miltek exhaust. Question I have now is, because of the Awe stage 3 tune, is it best to install green giants rather than another type injector?
Again- really apprecaite the help-been tearing my hair out thinking I did something wrong during the clutch/flywheel install or engine re-install.

[aysix]

Very good