cranks but no start

[kendal_jones101]

ok i been driving my 240 with sr20det redtop for about a month with no problems i have gt2871r 550cc injectors tuned with nistune ok went to the dyno made a few run at 12-17 psi put done good number on my way home i got on it a few times it ran perfect then i get to a stop light and it backfires studders then dies i start it it runs for a few then dies i figured the maf died pick up another z32 the same problem i got spark and fuel according to my fpr i swaped my other walbro in and no progress can some help me with this its really pissing me off it just cranks i give it gas itsounds like it wants to start but doesnt i cant smell fuel also

[Justin35ll]

Well if you have been cranking and cranking the engine it's possible you fouled the plugs or flooded the engine with the amount of fuel being put inthe cylinders.

Pull out the spark plugs and make sure they are in good condition.

Check and make sure the injectors are actually spitting fuel and that you're getting spark to all the cylinders.

Check the ECU for codes

Start with the easy things first

[kendal_jones101]

yea the spark plugs smell like fuel i swapped ecu fuel pump igniter chip coils maf and the plug are like a month old

[zach-Ka]

This happened to me, I cleaned my AICV and my Mafs and it started right up.

[kendal_jones101]

Ok this pissing me off the timing is dead on I changed the plugs coil packs, ecu maf fuel pump igniter chip and still the same I got spark I can hear the fuel pump priming what else could it be

[Justin35ll]

How do you know you have spark? And that your injectors are firing? The fuel pump turning on doesn't mean the fuel is getting to the cylinders

[kendal_jones101]

alright i pulled the fuel rail off with injectors still mounted and tryed cranking it and no fuel came out at all whats are the odds of the injectors beingbad there not even 6 months old or could it be the fuel rail it is a stock one

[kendal_jones101]

ok i figured it out iam not getting power to the injectors iam getting my 12v source from the red wire but the other i get nothing i checked all my grounds arounf the fuel rail what else could it be

[Justin35ll]

Did you put the voltmeter on the connector while someone was cranking it to see if it spikes to 12v when it's supposed to fire.Check for any loose connections on the harness. You said you already tried swapping out the ECU so it's gotta be something in the wiring or a timing issue.I'm actually not sure what the injectors are told to fire off of, I'm assuming the CAS

[kendal_jones101]

When I crank it I get no power at all just the 12v from red wire

[Beems240sx]

the injectors get a constant 12v and the ECU grounds out the injector to fire them. recheck your wiring if you already swapped ecu's and check the CAS

[kendal_jones101]

My cas was also replaced I tryed grounding pin 116 the injector ground wire and still nothing I really don't wanna pull out the whole harness for a broken ground but I guess what I have to do is there any way of ground it another way

[Justin35ll]

Check and make sure your timing is dead on if you had the cas removed

[kendal_jones101]

Yea the timing is dead right

[kendal_jones101]

ok i pulled out the ecu harness checked every pin and connector i also checked my cas again and swaped another one in now my injectors get fuel but it still does not want to start